aboutsummaryrefslogtreecommitdiffstats
path: root/erts/configure.in
blob: 06e2490e0cd666dee9db93304361f32031bbdfa3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
dnl Process this file with autoconf to produce a configure script. -*-m4-*-

dnl %CopyrightBegin%
dnl
dnl Copyright Ericsson AB 1997-2014. All Rights Reserved.
dnl
dnl The contents of this file are subject to the Erlang Public License,
dnl Version 1.1, (the "License"); you may not use this file except in
dnl compliance with the License. You should have received a copy of the
dnl Erlang Public License along with this software. If not, it can be
dnl retrieved online at http://www.erlang.org/.
dnl
dnl Software distributed under the License is distributed on an "AS IS"
dnl basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
dnl the License for the specific language governing rights and limitations
dnl under the License.
dnl
dnl %CopyrightEnd%

dnl The string "FIXME convbreak" means that there is a break of
dnl autoconf convention that should be cleaned up.

AC_INIT(vsn.mk)
AC_PREREQ(2.59)

LM_PRECIOUS_VARS

if test "x$no_recursion" != "xyes" -a "x$OVERRIDE_CONFIG_CACHE" = "x"; then
    # We do not want to use a common cache!
    cache_file=/dev/null
fi

dnl How to set srcdir absolute is taken from the GNU Emacs distribution
#### Make srcdir absolute, if it isn't already.  It's important to
#### avoid running the path through pwd unnecessary, since pwd can
#### give you automounter prefixes, which can go away.
case "${srcdir}" in
  /* ) ;;
  . )
    ## We may be able to use the $PWD environment variable to make this
    ## absolute.  But sometimes PWD is inaccurate.
    ## Make sure CDPATH doesn't affect cd (in case PWD is relative).
    CDPATH=
    if test "${PWD}" != "" && test "`(cd ${PWD} ; sh -c pwd)`" = "`pwd`"  ;
    then
      srcdir="$PWD"
    else
      srcdir="`(cd ${srcdir}; pwd)`"
    fi
  ;;
  *  ) srcdir="`(cd ${srcdir}; pwd)`" ;;
esac

## Now, make sure that ERL_TOP is set and is the same as srcdir
##
if test -z "$ERL_TOP" || test ! -d $ERL_TOP ; then
  AC_MSG_ERROR(You need to set the environment variable ERL_TOP!)
fi
if test x"${ERL_TOP}/erts" != x"$srcdir"; then
  AC_MSG_ERROR([You need to run configure with argument --srcdir=${ERL_TOP}/erts])
fi
erl_top=${ERL_TOP}

# Remove old configuration information
/bin/rm -f "$ERL_TOP/erts/CONF_INFO"

# echo XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
# echo X
# echo "X srcdir  = $srcdir"
# echo "X ERL_TOP = $ERL_TOP"
# echo X
# echo XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

AC_CONFIG_AUX_DIRS($srcdir/autoconf)

dnl ----------------------------------------------------------------------
dnl Figure out what system we are running on.
dnl ----------------------------------------------------------------------

#
# To configure for free source run ./configure --host=free_source
#
dnl
dnl AC_CANONICAL_HOST does not like free_source as a host specification,
dnl so we make a little special case.
dnl
if test "X$host" != "Xfree_source" -a "X$host" != "Xwin32"; then
    AC_CANONICAL_HOST
else
    host_os=$host
fi

if test "$cross_compiling" = "yes"; then
    CROSS_COMPILING=yes
else
    CROSS_COMPILING=no
fi
AC_SUBST(CROSS_COMPILING)

ERL_XCOMP_SYSROOT_INIT

AC_ISC_POSIX

AC_CONFIG_HEADER($host/config.h:config.h.in include/internal/$host/ethread_header_config.h:include/internal/ethread_header_config.h.in include/$host/erl_int_sizes_config.h:include/erl_int_sizes_config.h.in include/$host/erl_native_features_config.h:include/erl_native_features_config.h.in)
dnl ----------------------------------------------------------------------
dnl Optional features.
dnl ----------------------------------------------------------------------
enable_child_waiter_thread=no
ENABLE_ALLOC_TYPE_VARS=
AC_SUBST(ENABLE_ALLOC_TYPE_VARS)

AC_ARG_ENABLE(bootstrap-only,
AS_HELP_STRING([--enable-bootstrap-only],
               [enable bootstrap only configuration]),
[ if test "X$enableval" = "Xyes"; then
	# Disable stuff not necessary in a bootstrap only system in order
	# to speed up things by reducing the amount of stuff needing to be
	# built...
	enable_threads=no
	enable_smp_support=no
	with_termcap=no
	with_ssl=no
	with_ssl_zlib=no
	enable_hipe=no
	enable_sctp=no
        enable_dirty_schedulers=no
  fi	
])

AC_ARG_ENABLE(threads,
AS_HELP_STRING([--enable-threads], [enable async thread support])
AS_HELP_STRING([--disable-threads], [disable async thread support]),
[ case "$enableval" in
    no) enable_threads=no ;;
    *)  enable_threads=yes ;;
  esac ], enable_threads=unknown)

AC_ARG_ENABLE(dirty-schedulers,
AS_HELP_STRING([--enable-dirty-schedulers], [enable dirty scheduler support]),
[ case "$enableval" in
    no) enable_dirty_schedulers=no ;;
    *)  enable_dirty_schedulers=yes ;;
  esac ], enable_dirty_schedulers=no)

AC_ARG_ENABLE(halfword-emulator,
AS_HELP_STRING([--enable-halfword-emulator],
               [enable halfword emulator (only for 64bit builds). Note: Halfword emulator is marked as deprecated and scheduled for removal in future major release.]),
[ case "$enableval" in
    no) enable_halfword_emualtor=no ;;
    *)  enable_halfword_emulator=yes ;;
  esac ], enable_halfword_emulator=unknown)

AC_ARG_ENABLE(smp-support,
AS_HELP_STRING([--enable-smp-support], [enable smp support])
AS_HELP_STRING([--disable-smp-support], [disable smp support]),
[ case "$enableval" in
    no) enable_smp_support=no ;;
    *)  enable_smp_support=yes ;;
  esac ], enable_smp_support=unknown)

AC_ARG_ENABLE(smp-require-native-atomics,
	      AS_HELP_STRING([--disable-smp-require-native-atomics],
                             [disable the SMP requirement of a native atomic implementation]),
[ case "$enableval" in
    no) smp_require_native_atomics=no ;;
    *)  smp_require_native_atomics=yes ;;
  esac ], smp_require_native_atomics=yes)

AC_ARG_WITH(termcap,
AS_HELP_STRING([--with-termcap], [use termcap (default)])
AS_HELP_STRING([--without-termcap],
               [do not use any termcap libraries (ncurses,curses,termcap,termlib)]),
[],
[with_termcap=yes])

AC_ARG_ENABLE(lock-checking,
AS_HELP_STRING([--enable-lock-checking], [enable lock checking]),
[ case "$enableval" in
    no) enable_lock_check=no ;;
    *)  enable_lock_check=yes ;;
  esac
],
  enable_lock_check=no)

AC_ARG_ENABLE(lock-counter,
AS_HELP_STRING([--enable-lock-counter], [enable lock counters]),
[ case "$enableval" in
    no) enable_lock_count=no ;;
    *)  enable_lock_count=yes ;;
  esac ], enable_lock_count=no)

AC_ARG_ENABLE(kernel-poll,
AS_HELP_STRING([--enable-kernel-poll], [enable kernel poll support])
AS_HELP_STRING([--disable-kernel-poll], [disable kernel poll support]),
[ case "$enableval" in
    no) enable_kernel_poll=no ;;
    *)  enable_kernel_poll=yes ;;
  esac ], enable_kernel_poll=unknown)


AC_ARG_ENABLE(sctp,
AS_HELP_STRING([--enable-sctp], [enable sctp support (default)])
AS_HELP_STRING([--disable-sctp], [disable sctp support]),
[ case "$enableval" in
    no) enable_sctp=no ;;
    *)  enable_sctp=yes ;;
  esac ], enable_sctp=unknown)

AC_ARG_ENABLE(hipe,
AS_HELP_STRING([--enable-hipe], [enable hipe support])
AS_HELP_STRING([--disable-hipe], [disable hipe support]))

AC_ARG_ENABLE(native-libs,
AS_HELP_STRING([--enable-native-libs],
               [compile Erlang libraries to native code]))

AC_ARG_ENABLE(fp-exceptions,
AS_HELP_STRING([--enable-fp-exceptions],
               [use hardware floating point exceptions (default if hipe enabled)]),
[ case "$enableval" in
    no) enable_fp_exceptions=no ;;
    *)  enable_fp_exceptions=yes ;;
  esac
],enable_fp_exceptions=auto)

AC_ARG_ENABLE(darwin-universal,
AS_HELP_STRING([--enable-darwin-universal],
               [build universal binaries on darwin i386]),
[ case "$enableval" in
    no) enable_darwin_universal=no ;;
    *)  enable_darwin_univeral=yes ;;
  esac
],enable_darwin_universal=no)


AC_ARG_ENABLE(darwin-64bit,
AS_HELP_STRING([--enable-darwin-64bit], [build 64bit binaries on darwin]),
[ case "$enableval" in
    no) enable_darwin_64bit=no ;;
    *)  enable_darwin_64bit=yes ;;
  esac
],enable_darwin_64bit=no)

AC_ARG_ENABLE(m64-build,
AS_HELP_STRING([--enable-m64-build],
               [build 64bit binaries using the -m64 flag to (g)cc]),
[ case "$enableval" in
    no) enable_m64_build=no ;;
    *)  enable_m64_build=yes ;;
  esac
],enable_m64_build=no)

AC_ARG_ENABLE(m32-build,
AS_HELP_STRING([--enable-m32-build],
               [build 32bit binaries using the -m32 flag to (g)cc]),
[ case "$enableval" in
    no) enable_m32_build=no ;;
    *)
	if test X${enable_darwin_64bit} = Xyes -o  X${enable_m64_build} = Xyes;
	then
		AC_MSG_ERROR([(--enable-darwin-64bit or --enable-m64-build) and --enable-m32-build are mutually exclusive]) ;
	fi ;
	enable_m32_build=yes ;;
  esac
],enable_m32_build=no)

AC_SUBST(PERFCTR_PATH)
AC_ARG_WITH(perfctr,
AS_HELP_STRING([--with-perfctr=PATH],
               [specify location of perfctr include and lib])
AS_HELP_STRING([--without-perfctr], [don't use perfctr (default)]))

if test "x$with_perfctr" = "xno" -o "x$with_perfctr" = "x" ; then
    PERFCTR_PATH=
else
    if test ! -f "$with_perfctr/usr.lib/libperfctr.a" ; then
	AC_MSG_ERROR(Invalid path to option --with-perfctr=PATH)
    fi
    PERFCTR_PATH="$with_perfctr"
    AC_DEFINE(USE_PERFCTR,[1],
              [Define to enable hrvtime() on Linux systems with perfctr extension])
fi


AC_ARG_WITH(dynamic-trace,
AS_HELP_STRING([--with-dynamic-trace={dtrace|systemtap}],
	       [specify use of dynamic trace framework, dtrace or systemtap])
AS_HELP_STRING([--without-dynamic-trace], 
               [don't enable any dynamic tracing (default)]))

if test X"$with_dynamic_trace" = X""; then
   with_dynamic_trace=no
fi

case "$with_dynamic_trace" in
     no) DYNAMIC_TRACE_FRAMEWORK=;;
     dtrace) 
	    AC_DEFINE(USE_DTRACE,[1],
		[Define if you want to use dtrace for dynamic tracing])
     	     DYNAMIC_TRACE_FRAMEWORK=dtrace;;
     systemtap) 
	    AC_DEFINE(USE_SYSTEMTAP,[1],
		[Define if you want to use systemtap for dynamic tracing])
	    DYNAMIC_TRACE_FRAMEWORK=systemtap;;
     *)	
     	    AC_MSG_ERROR(Unknown dynamic tracing framework specified with --with-dynamic-trace!);;
esac

if test X"$DYNAMIC_TRACE_FRAMEWORK" != X""; then
   AC_DEFINE(USE_DYNAMIC_TRACE,[1],
		[Define if you want to use dynamic tracing])
fi

AC_ARG_ENABLE(vm-probes,
AS_HELP_STRING([--enable-vm-probes],
               [add dynamic trace probes to the Beam VM (only possible if --with-dynamic-trace is enabled, and then default)]),
	       [ case "$enableval" in
    	       	 no) use_vm_probes=no ;;
    		 *)
			if  test X"$DYNAMIC_TRACE_FRAMEWORK" != X""; then
		 	    use_vm_probes=yes ;
			else
			    AC_MSG_ERROR(Can not enable VM probes without any dynamic tracing framework!);
			fi;;  
  		 esac ], if  test X"$DYNAMIC_TRACE_FRAMEWORK" != X""; then
		 	    use_vm_probes=yes ;
			else
			    use_vm_probes=no
			fi)

AC_SUBST(USE_VM_PROBES)
if test X"$use_vm_probes" = X"yes"; then
   USE_VM_PROBES=yes
   AC_DEFINE(USE_VM_PROBES,[1],
	     [Define to enable VM dynamic trace probes])
fi


AC_ARG_ENABLE(clock-gettime,
AS_HELP_STRING([--enable-clock-gettime],
               [use clock-gettime for time correction]),
[ case "$enableval" in
    no) clock_gettime_correction=no ;;
    *) clock_gettime_correction=yes ;;
  esac ], clock_gettime_correction=unknown)

AC_ARG_WITH(assumed-cache-line-size,
AS_HELP_STRING([--with-assumed-cache-line-size=SIZE],
               [specify assumed cache line size in bytes (valid values are powers of two between and including 16 and 8192; default is 64)]))

dnl Require the assumed cache-line size to be a power of two between 16 and 8192
case "$with_assumed_cache_line_size" in
     ""|no|yes)
	with_assumed_cache_line_size=64;;
     16|32|64|128|256|512|1024|2048|4096|8192)
	;;
     *)
	AC_MSG_ERROR([Invalid assumed cache-line size of $with_assumed_cache_line_size bytes])
	;;
esac

AC_DEFINE_UNQUOTED(ASSUMED_CACHE_LINE_SIZE,
		   $with_assumed_cache_line_size,
		   [Assumed cache-line size (in bytes)])

AC_ARG_ENABLE(systemd,
AS_HELP_STRING([--enable-systemd], [enable systemd support in epmd]),
[],
[enable_systemd=no])

dnl Magic test for clearcase.
OTP_RELEASE=
if test "${ERLANG_COMMERCIAL_BUILD}" != ""; then
	OTP_EXTRA_FLAGS=-DOTP_RELEASE
	OTP_RELEASE=yes
else
	OTP_EXTRA_FLAGS=
fi
AC_SUBST(OTP_RELEASE)

AC_MSG_CHECKING([OTP release])
[SYSTEM_VSN=`cat $ERL_TOP/OTP_VERSION | sed "s|\([0-9]*\).*|\1|"`]
AC_MSG_RESULT([$SYSTEM_VSN])
AC_SUBST(SYSTEM_VSN)

AC_MSG_CHECKING([OTP version])
[OTP_VERSION=`cat $ERL_TOP/OTP_VERSION`]
AC_MSG_RESULT([$OTP_VERSION])
AC_SUBST(OTP_VERSION)

dnl OK, we might have darwin switches off different kinds, lets 
dnl check it all before continuing.
TMPSYS=`uname -s`-`uname -m`
if test X${enable_darwin_universal} = Xyes; then
	if test X${enable_darwin_64bit} = Xyes; then
		AC_MSG_ERROR([--enable-darwin-universal and --enable-darwin-64bit mutually exclusive])
	fi
	enable_hipe=no
	case $CFLAGS in
		*-arch\ ppc*)
			;;
		*)
			CFLAGS="-arch ppc $CFLAGS"
			;;
	esac
	case $CFLAGS in
		*-arch\ i386*)
			;;
		*)
			CFLAGS="-arch i386 $CFLAGS"
			;;
	esac
fi
if test X${enable_darwin_64bit} = Xyes; then
	case "$TMPSYS" in
	    Darwin-i386|Darwin-x86_64)
		;;
	    Darwin*)
		AC_MSG_ERROR([--enable-darwin-64bit only supported on x86 hosts])
		;;
	    *)
		AC_MSG_ERROR([--enable-darwin-64bit only supported on Darwin])
		;;
	esac
fi
if test X${enable_darwin_64bit} = Xyes -o X${enable_m64_build} = Xyes; then
	case $CFLAGS in
		*-m64*)
			;;
		*)
			CFLAGS="-m64 $CFLAGS"
			;;
	esac
else
	if test X${enable_m32_build} = Xyes;
	then
		enable_hipe=no;
		case $CFLAGS in
		    *-m32*)
			    ;;
		    *)
			    CFLAGS="-m32 $CFLAGS"
			    ;;
		esac ;
	fi
fi

AC_ARG_ENABLE(static-nifs,
AS_HELP_STRING([--enable-static-nifs], [link nifs statically. If yes then all nifs in all Erlang/OTP applications will be statically linked into the main binary. It is also possible to give a list of nifs that should be linked statically. The list should be a comma separated and contain the absolute path to a .a archive for each nif that is to be statically linked. The name of the .a archive has to be the same as the name of the nif. Note that you have to link any external dependencies that the nifs have to the main binary, so for the crypto nif you want to pass LIBS=-lcrypto to configure.]),
	       STATIC_NIFS="$enableval",
	       STATIC_NIFS=no)
AC_SUBST(STATIC_NIFS)

AC_ARG_ENABLE(static-drivers,
AS_HELP_STRING([--enable-static-drivers], [comma separated list of linked-in drivers to link statically with the main binary. The list should contain the absolute path to a .a archive for each driver that is to be statically linked. The name of the .a archive has to be the same as the name of the driver.]),
	       STATIC_DRIVERS="$enableval",
	       STATIC_DRIVERS=no)
AC_SUBST(STATIC_DRIVERS)

AC_ARG_WITH(ets-write-concurrency-locks,
AS_HELP_STRING([--with-ets-write-concurrency-locks={8|16|32|64|128|256}],
               [specify how many locks the write_concurrency option for ets should use.])
AS_HELP_STRING([--without-ets-write-concurrency-locks],
               [use the default number of write_concurrency locks (default)]))

if test X"$with_ets_write_concurrency_locks" != X""; then
   AC_DEFINE_UNQUOTED(ERTS_DB_HASH_LOCK_CNT,$with_ets_write_concurrency_locks,
		      [Define to override the default number of write_concurrency locks])
fi

dnl ----------------------------------------------------------------------
dnl Checks for programs.
dnl ----------------------------------------------------------------------

AC_PROG_CC
AC_SUBST(GCC)

dnl ---------------------------------------------------------------------
dnl Special stuff regarding CFLAGS and details in the environment...
dnl ---------------------------------------------------------------------

dnl NOTE: CPPFLAGS will be included in CFLAGS at the end
case $host_os in
    linux*) CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE";; 
    win32)
	# The ethread library requires _WIN32_WINNT of at least 0x0403.
	# -D_WIN32_WINNT=* from CPPFLAGS is saved in ETHR_DEFS.
	CPPFLAGS="$CPPFLAGS -D_WIN32_WINNT=0x0501 -DWINVER=0x0501"
	;;
    darwin*)
        CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE"
        ;;
    *)
	;;
esac


LM_WINDOWS_ENVIRONMENT
	
dnl
dnl Flags to the C compiler
dnl
dnl Make sure we find config.h
dnl

extra_flags="-I${ERL_TOP}/erts/$host $OTP_EXTRA_FLAGS"
CFLAGS="$CFLAGS $extra_flags"
DEBUG_CFLAGS="-g $CPPFLAGS $extra_flags $DEBUG_CFLAGS"
DEBUG_FLAGS=-g

dnl
dnl Adjust DEBUG_CFLAGS to match CFLAGS in terms of -m
dnl

case $CFLAGS in
	*-m64*)
		case $DEBUG_CFLAGS in
			*-m64*)
				;;
			*)
				DEBUG_CFLAGS="-m64 $DEBUG_CFLAGS"
				;;
		esac
		;;
	*-m32*)
		case $DEBUG_CFLAGS in
			*-m32*)
				;;
			*)
				DEBUG_CFLAGS="-m32 $DEBUG_CFLAGS"
				;;
		esac
		;;
	*)
		;;
esac



CFLAG_RUNTIME_LIBRARY_PATH="-Wl,-R"
case $host_os in
  darwin*)
	CFLAG_RUNTIME_LIBRARY_PATH=
	;;
  win32)
	CFLAG_RUNTIME_LIBRARY_PATH=
	;;
  osf*)
	CFLAG_RUNTIME_LIBRARY_PATH="-Wl,-rpath,"
	;;
  *)
	;;
esac

lfs_conf=ok
lfs_source=none
if test "${LFS_CFLAGS+set}" = "set" || \
   test "${LFS_LDFLAGS+set}" = "set" || \
   test "${LFS_LIBS+set}" = "set"; then
    lfs_source=user
else
   LM_CHECK_GETCONF
   test "$GETCONF" = "false" || lfs_source=getconf
fi

if test "$lfs_source" = "none"; then
    AC_MSG_WARN([Do not know how to check for large file support flags; no getconf is available])
else
    for var in CFLAGS LDFLAGS LIBS; do
	AC_MSG_CHECKING([for large file support $var])
	if test $lfs_source = user; then
	    eval "lfs_val=\"\$LFS_$var\""
	else
	    eval "lfs_var=LFS_$var"
	    lfs_val=`$GETCONF $lfs_var 2>/dev/null` || lfs_conf=failed
	    if test $lfs_conf = failed; then
		AC_MSG_RESULT([failed])
		break
	    fi
	    eval "$lfs_var=\"$lfs_val\""
	fi
	test "$lfs_val" != "" || lfs_val=none
	AC_MSG_RESULT([$lfs_val])
    done
    if test $lfs_conf = failed; then
	AC_MSG_WARN([Check for large file support flags failed; $GETCONF failed])
    else
	CFLAGS="$CFLAGS $LFS_CFLAGS"
	DEBUG_CFLAGS="$DEBUG_CFLAGS $LFS_CFLAGS"
	LDFLAGS="$LDFLAGS $LFS_LDFLAGS"
	LIBS="$LIBS $LFS_LIBS"
    fi
fi

if test "x$GCC" = xyes; then
  # Treat certain GCC warnings as errors
  LM_TRY_ENABLE_CFLAG([-Werror=return-type], [WERRORFLAGS])

  # until the emulator can handle this, I suggest we turn it off!
  #WFLAGS="-Wall -Wshadow -Wcast-qual -Wmissing-declarations"
  WFLAGS="-Wall -Wstrict-prototypes"

  case "$host_cpu" in
    tile*)
      # tile-gcc is a bit stricter with -Wmissing-prototypes than other gccs,
      # and too strict for our taste.
      ;;
    *)
      WFLAGS="$WFLAGS -Wmissing-prototypes";;
  esac

  saved_CFLAGS=$CFLAGS
  CFLAGS="$CFLAGS -Wdeclaration-after-statement"
  AC_TRY_COMPILE([],[;], warn_decl_after_st=true, warn_decl_after_st=false)
  if test "X$warn_decl_after_st" = "Xtrue"; then
    WFLAGS="$WFLAGS -Wdeclaration-after-statement"
  fi
  CFLAGS=$saved_CFLAGS
else
  WFLAGS=""
  WERRORFLAGS=""
fi
dnl DEBUG_FLAGS is obsolete (I hope)
AC_SUBST(DEBUG_FLAGS)
AC_SUBST(DEBUG_CFLAGS)
AC_SUBST(WFLAGS)
AC_SUBST(WERRORFLAGS)
AC_SUBST(CFLAG_RUNTIME_LIBRARY_PATH)

AC_CHECK_SIZEOF(void *) # Needed for ARCH and smp checks below
if test "x$ac_cv_sizeof_void_p" = x8; then
  AC_SUBST(EXTERNAL_WORD_SIZE, 64)
else
  AC_SUBST(EXTERNAL_WORD_SIZE, 32)
fi

dnl
dnl Figure out operating system and cpu architecture
dnl

if test "x$host_alias" != "x"; then
    chk_opsys_=$host_os
else
    chk_opsys_=`uname -s`
    if test "x$chk_opsys_" = "xSunOS"; then
	chk_opsys_=$chk_opsys_`uname -r`
    fi
fi
case $chk_opsys_ in
    win32)			OPSYS=win32;;
    solaris2.*|SunOS5.*)	OPSYS=sol2;;
    linux|Linux)		OPSYS=linux;;
    darwin|Darwin)		OPSYS=darwin;;
    freebsd|FreeBSD)		OPSYS=freebsd;;
    *)				OPSYS=noopsys
esac

if test "x$host_alias" != "x" -a "x$host_cpu" != "x"; then
    chk_arch_=$host_cpu
else
    chk_arch_=`uname -m`
fi

case $chk_arch_ in
    sun4u)	ARCH=ultrasparc;;
    sparc64)	ARCH=sparc64;;
    sun4v)	ARCH=ultrasparc;;
    i86pc)	ARCH=x86;;
    i386)	ARCH=x86;;
    i486)	ARCH=x86;;
    i586)	ARCH=x86;;
    i686)	ARCH=x86;;
    x86_64)	ARCH=amd64;;
    amd64)	ARCH=amd64;;
    macppc)	ARCH=ppc;;
    powerpc)	ARCH=ppc;;
    ppc)	ARCH=ppc;;
    ppc64)	ARCH=ppc64;;
    "Power Macintosh")	ARCH=ppc;;
    armv5b)	ARCH=arm;;
    armv5teb)	ARCH=arm;;
    armv5tel)	ARCH=arm;;
    armv5tejl)	ARCH=arm;;
    armv6l)	ARCH=arm;;
    armv6hl)	ARCH=arm;;
    armv7l)	ARCH=arm;;
    armv7hl)	ARCH=arm;;
    tile)	ARCH=tile;;
    *)	 	ARCH=noarch;;
esac

dnl
dnl Convert between x86 and amd64 based on the compiler's mode.
dnl Ditto between ultrasparc and sparc64.
dnl
AC_MSG_CHECKING(whether compilation mode forces ARCH adjustment)
case "$ARCH-$ac_cv_sizeof_void_p" in
i386-8)
	AC_MSG_RESULT(yes: adjusting ARCH=x86 to ARCH=amd64)
	ARCH=amd64
	;;
x86-8)
	AC_MSG_RESULT(yes: adjusting ARCH=x86 to ARCH=amd64)
	ARCH=amd64
	;;
amd64-4)
	AC_MSG_RESULT(yes: adjusting ARCH=amd64 to ARCH=x86)
	ARCH=x86
	;;
ultrasparc-8)
	AC_MSG_RESULT(yes: adjusting ARCH=ultrasparc to ARCH=sparc64)
	ARCH=sparc64
	;;
sparc64-4)
	AC_MSG_RESULT(yes: adjusting ARCH=sparc64 to ARCH=ultrasparc)
	ARCH=ultrasparc
	;;
ppc64-4)
	AC_MSG_RESULT(yes: adjusting ARCH=ppc64 to ARCH=ppc)
	ARCH=ppc
	;;
*)
	AC_MSG_RESULT(no)
	;;
esac

AC_SUBST(OPSYS)
AC_SUBST(ARCH)

dnl Check consistency of os and darwin-switches


dnl Take care of LDFLAGS on darwin, and disable common_test as it
dnl has a build/configure system re rx-lib that is not compatible
dnl First remove common_tests skip file.

dnl Adjust LDFLAGS to allow 64bit linkage on DARWIN
case $ARCH-$OPSYS in
	amd64-darwin*)
		AC_MSG_NOTICE([Adjusting LDFLAGS to cope with 64bit Darwin])
		case $LDFLAGS in
			*-m64*)
				;;
			*)
				LDFLAGS="-m64 $LDFLAGS"
			;;
		esac
		;;
	*-darwin*)
		if test X${enable_darwin_universal} = Xyes; then
			AC_MSG_NOTICE([Adjusting LDFLAGS for universal binaries])
			
			case $LDFLAGS in
				*-arch\ ppc*)
					;;
				*)
					LDFLAGS="-arch ppc $LDFLAGS"
					;;
			esac
			case $LDFLAGS in
				*-arch\ i386*)
					;;
				*)
					LDFLAGS="-arch i386 $LDFLAGS"
					;;
			esac
		else
			case $LDFLAGS in
				*-m32*)
					;;
				*)
					LDFLAGS="-m32 $LDFLAGS"
					;;
			esac
		fi
		;;
	*)
		if test X${enable_m64_build} = Xyes; then
			AC_MSG_NOTICE([Adjusting LDFLAGS to use -m64])
			case $LDFLAGS in
				*-m64*)
					;;
				*)
					LDFLAGS="-m64 $LDFLAGS"
				;;
			esac
		fi;
		if test X${enable_m32_build} = Xyes; then
			AC_MSG_NOTICE([Adjusting LDFLAGS to use -m32]) ;
			case $LDFLAGS in
				*-m32*)
					;;
				*)
					LDFLAGS="-m32 $LDFLAGS"
				;;
			esac ;
		fi
		;;
esac

AC_MSG_CHECKING(if VM has to be linked with Carbon framework)
case $ARCH-$OPSYS in
	*-darwin*)
  		LIBCARBON="-framework Carbon -framework Cocoa"
		AC_MSG_RESULT([yes])
		;;
	*)
		LIBCARBON=
		AC_MSG_RESULT([no])
		;;
esac
	
AC_SUBST(LIBCARBON)

dnl Check if we should/can build a halfword emulator

AC_MSG_CHECKING(if we are building a halfword emulator (32bit heap on 64bit machine))
if test "$enable_halfword_emulator" = "yes"; then
	if test "$ARCH" = "amd64"; then
		AC_DEFINE(HALFWORD_HEAP_EMULATOR, [1],
			  [Define if building a halfword-heap 64bit emulator])
		ENABLE_ALLOC_TYPE_VARS="$ENABLE_ALLOC_TYPE_VARS halfword"
		AC_MSG_RESULT([yes])

		test -f "$ERL_TOP/erts/CONF_INFO" ||
		    echo "" > "$ERL_TOP/erts/CONF_INFO"
		cat >> $ERL_TOP/erts/CONF_INFO <<EOF

                 The HALFWORD emulator has been enabled.
                 This is a DEPRECATED feature scheduled for removal
                 in a future major release.

EOF
	else
		AC_MSG_ERROR(no; halfword emulator not supported on this architecture)
	fi
else
	AC_MSG_RESULT([no])
fi





dnl some tests below will call this if we haven't already - and autoconf
dnl can't handle those tests being done conditionally at runtime
AC_PROG_CPP

AC_PROG_RANLIB

AC_PROG_YACC
LM_PROG_PERL5
if test "$ac_cv_path_PERL" = false; then
  AC_MSG_ERROR([Perl version 5 is required to build the emulator!])
fi
AC_PROG_LN_S


AC_CHECK_TOOL([AR], [ar], [false])
if test "$ac_cv_prog_AR" = false; then
  AC_MSG_ERROR([No 'ar' command found in PATH])
fi

_search_path=/bin:/usr/bin:/usr/local/bin:$PATH

AC_PATH_PROG(RM, rm, false, $_search_path)
if test "$ac_cv_path_RM" = false; then
  AC_MSG_ERROR([No 'rm' command found])
fi

AC_PATH_PROG(MKDIR, mkdir, false, $_search_path)
if test "$ac_cv_path_MKDIR" = false; then
  AC_MSG_ERROR([No 'mkdir' command found])
fi

_search_path=

#
# Get programs needed for building the documentation 
#

## Delete previous failed configure results
if test -f doc/CONF_INFO; then
   rm doc/CONF_INFO
fi

AC_CHECK_PROGS(XSLTPROC, xsltproc)
if test -z "$XSLTPROC"; then
  echo "xsltproc" >> doc/CONF_INFO
  AC_MSG_WARN([No 'xsltproc' command found: the documentation cannot be built])
fi

AC_CHECK_PROGS(FOP, fop)
if test -z "$FOP"; then
  FOP="$ERL_TOP/make/fakefop"
  echo "fop" >> doc/CONF_INFO
  AC_MSG_WARN([No 'fop' command found: going to generate placeholder PDF files])
fi

AC_CHECK_PROGS(XMLLINT, xmllint)
if test -z "$XMLLINT"; then
  echo "xmllint" >> doc/CONF_INFO
  AC_MSG_WARN([No 'xmllint' command found: can't run the xmllint target for the documentation])
fi

dnl
dnl We can live with Solaris /usr/ucb/install
dnl
case $host in
  *-*-solaris*|free_source)
    if test -x /usr/ucb/install; then
      INSTALL="/usr/ucb/install -c"
    fi
    ;;
  *)
    ;;
esac
AC_PROG_INSTALL
LM_PROG_INSTALL_DIR

case $host_os in
	darwin*)
		dnl Need to preserve modification time on archives;
		dnl otherwise, ranlib has to be run on archives
		dnl again after installation.
		INSTALL_DATA="$INSTALL_DATA -p";;
	*)
		;;
esac

dnl
dnl Fix for Tilera install permissions
dnl

case $build in
	*tile*)
		INSTALL_PROGRAM="$INSTALL_PROGRAM -m755"
		INSTALL_SCRIPT="$INSTALL_SCRIPT -m755"
		;;
	*)
		;;
esac

dnl ----------------------------------------------------------------------
dnl Misc. things (some of them should go away)
dnl ----------------------------------------------------------------------

dnl
dnl An attempt to allow cross compiling. This is not the right way,
dnl nor does it work currently. Some makefiles still needs these
dnl variables, so we leave them in for now.
dnl
HCC='$(CC)'         AC_SUBST(HCC)
HCFLAGS=""          AC_SUBST(HCFLAGS)
HCFLAGS="$HCFLAGS -I${ERL_TOP}/erts/$host"
vxworks_reclaim=""  AC_SUBST(vxworks_reclaim)

dnl We want to use $(CC) as linker for the emulator regardless of
dnl what the user say. This might not be the right way to do it, but
dnl for now that is the way we do it.
USER_LD=$LD
USER_LDFLAGS="$LDFLAGS"
case $host in
   *ose) ;;
   *) LD='$(CC)' ;;
esac
AC_SUBST(LD)

LDFLAG_RUNTIME_LIBRARY_PATH="$CFLAG_RUNTIME_LIBRARY_PATH"
AC_SUBST(LDFLAG_RUNTIME_LIBRARY_PATH)

dnl Check for cygwin and object/exe files extension
dnl AC_CYGWIN is deprecated
AC_EXEEXT
AC_OBJEXT

dnl This is the os flavour, should be unix, ose, vxworks or win32
case $host in
   win32)
      ERLANG_OSTYPE=win32 ;;
   *ose)
      ERLANG_OSTYPE=ose ;;
   *)
      ERLANG_OSTYPE=unix ;;
esac

AC_SUBST(ERLANG_OSTYPE)

# Check how to export functions from the emulator executable, needed
# when dynamically loaded drivers are loaded (so that they can find
# emulator functions).
# OS'es with ELF executables using the GNU linker (Linux and recent *BSD,
# in rare cases Solaris) typically need '-Wl,-export-dynamic' (i.e. pass
# -export-dynamic to the linker - also known as -rdynamic and some other
# variants); some sysVr4 system(s) instead need(s) '-Wl,-Bexport'.
# AIX 4.x (perhaps only for x>=2) wants -Wl,-bexpall,-brtl and doesn't
# reliably return an error for others, thus we separate it out.
# Otherwise we assume that if the linker accepts the flag, it is needed.
AC_MSG_CHECKING(for extra flags needed to export symbols)
DEXPORT=""
case $host_os in
	aix4*)
		DEXPORT=-Wl,-bexpall,-brtl
	;;
	bsdi*)
    		DEXPORT="-rdynamic " 
    	;;
	win32)
    		DEXPORT="" 
    	;;
	*)
		save_ldflags="$LDFLAGS"
		LDFLAGS=-Wl,-export-dynamic
		AC_TRY_LINK(,,[DEXPORT=-Wl,-export-dynamic], [
			LDFLAGS=-Wl,-Bexport
			AC_TRY_LINK(,,[DEXPORT=-Wl,-Bexport],
				AC_MSG_RESULT(none))])
		LDFLAGS="$save_ldflags"
	;;
esac
AC_SUBST(DEXPORT)
case "x$DEXPORT" in
	"x")
		AC_MSG_RESULT([none]);;
	*)
		AC_MSG_RESULT([$DEXPORT]);;
esac

# Check for Solaris/ultrasparc /dev/perfmon interface
# (also needs gcc specific asm instructions)
case "${host}:${GCC}" in
  sparc-*-solaris*:yes)
    AC_DEFINE(HAVE_SOLARIS_SPARC_PERFMON,[1],
	[define if you have the Solaris/ultrasparc /dev/perfmon interface])
    ;;
  *)
    ;;
esac


dnl ----------------------------------------------------------------------
dnl Checks for libraries.
dnl ----------------------------------------------------------------------

AC_CHECK_LIB(m, sin)
AC_CHECK_LIB(dl, dlopen)
AC_CHECK_LIB(inet, main)
AC_CHECK_LIB(util, openpty)

dnl Try to find a thread library.
dnl
dnl ETHR_LIB_NAME, ETHR_LIBS, ETHR_X_LIBS, ETHR_THR_LIB_BASE and ETHR_DEFS
dnl are set by ERL_FIND_ETHR_LIB
ERL_FIND_ETHR_LIB

if test "X$ETHR_LIB_NAME" = "X"; then
    found_threads=no
else
    found_threads=yes
fi


ERTS_BUILD_SMP_EMU=$enable_smp_support
AC_MSG_CHECKING(whether an emulator with smp support should be built)
case $ERTS_BUILD_SMP_EMU in
    yes)
	AC_MSG_RESULT(yes; enabled by user)
	;;
    no)
	AC_MSG_RESULT(no; disabled by user)
	;;
    unknown)
	AC_TRY_COMPILE([],[
			#if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
			;
			#else
			#error old or no gcc
			#endif
			],
			gcc_smp=okgcc,
			gcc_smp=oldornogcc)
	ERTS_BUILD_SMP_EMU=yes
	case "$enable_threads-$gcc_smp-$found_threads-$host_os" in

	    no-*)
		AC_MSG_RESULT(no; threads disabled by user)
		ERTS_BUILD_SMP_EMU=no
		;;

	    *-okgcc-yes-*)
		AC_MSG_RESULT(yes)
		ERTS_BUILD_SMP_EMU=yes
		;;

	    *-win32)
		AC_MSG_RESULT(yes)
		ERTS_BUILD_SMP_EMU=yes
		;;

	    *-oldornogcc-*)
		AC_MSG_RESULT(no; old gcc or no gcc found)
		ERTS_BUILD_SMP_EMU=no
		;;

	    *)
		AC_MSG_RESULT(no)
		ERTS_BUILD_SMP_EMU=no
		;;
	esac
	;;
esac

if test $ERTS_BUILD_SMP_EMU = yes; then

	if test $found_threads = no; then
	    AC_MSG_ERROR([cannot build smp enabled emulator since no thread library was found])
	fi

	AC_DEFINE(ERTS_HAVE_SMP_EMU, 1, [Define if the smp emulator is built])

	test "X$smp_require_native_atomics" = "Xyes" &&
	     AC_DEFINE(ETHR_SMP_REQUIRE_NATIVE_IMPLS, 1, [Define if you want to enable check for native ethread implementations])

	case "$ethr_have_native_atomics-$smp_require_native_atomics-$ethr_have_native_spinlock" in
	  yes-*)
		;;

	  no-yes-*)
		AC_MSG_ERROR([No native atomic implementation found. See Configuring section in INSTALL.md for more information.])
		;;

	  no-no-yes)

		test -f "$ERL_TOP/erts/CONF_INFO" ||
		    echo "" > "$ERL_TOP/erts/CONF_INFO"
		cat >> $ERL_TOP/erts/CONF_INFO <<EOF

                 No native atomic implementation available.
                 Fallbacks implemented using spinlocks will be
                 used. Note that the performance of the SMP
                 runtime system will suffer immensely due to
		 this.

EOF
		;;

	  no-no-no)

		test -f "$ERL_TOP/erts/CONF_INFO" ||
		    echo "" > "$ERL_TOP/erts/CONF_INFO"
		cat >> "$ERL_TOP/erts/CONF_INFO" <<EOF

                 No native atomic implementation, nor no native
                 spinlock implementation available. Fallbacks
                 implemented using mutexes will be used. Note
                 that the performance of the SMP runtime system
                 will suffer immensely due to this.

EOF
		;;

	esac

	enable_threads=force
fi

AC_SUBST(ERTS_BUILD_SMP_EMU)

AC_CHECK_FUNCS([posix_fadvise closefrom])
AC_CHECK_HEADERS([linux/falloc.h])
dnl * Old glibcs have broken fallocate64(). Make sure not to use it.
AC_CACHE_CHECK([whether fallocate() works],i_cv_fallocate_works,[
    AC_TRY_LINK([
        #include <stdio.h>
        #include <stdlib.h>
        #include <fcntl.h>
        #include <unistd.h>
	#include <fcntl.h>
	#include <linux/falloc.h>
	],
        [	            
	int fd = creat("conftest.temp", 0600);
        fallocate(fd, FALLOC_FL_KEEP_SIZE,(off_t)  1024,(off_t)  1024);
    	], i_cv_fallocate_works=yes, i_cv_fallocate_works=no)
])
if test $i_cv_fallocate_works = yes; then
   AC_DEFINE(HAVE_FALLOCATE, 1, Define if you have a working fallocate())
fi

dnl * Old glibcs have broken posix_fallocate(). Make sure not to use it.
dnl * It may also be broken in AIX.
AC_CACHE_CHECK([whether posix_fallocate() works],i_cv_posix_fallocate_works,[
    AC_TRY_RUN([
        #if !defined(__sun) && !defined(__sun__)
        #define _XOPEN_SOURCE 600
        #endif
        #include <stdio.h>
        #include <stdlib.h>
        #include <fcntl.h>
        #include <unistd.h>
        #if defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 7))
            possibly broken posix_fallocate
        #endif
        int main() {
            int fd = creat("conftest.temp", 0600);
            int ret;
            if (-1 == fd) {
               perror("creat()");
               return 2;
            }
            ret = posix_fallocate(fd, 1024, 1024) < 0 ? 1 : 0;
            unlink("conftest.temp");
            return ret;
        }
    ], [
        i_cv_posix_fallocate_works=yes
    ], [
        i_cv_posix_fallocate_works=no
    ], [
        i_cv_posix_fallocate_works=no
    ])
])
if test $i_cv_posix_fallocate_works = yes; then
   AC_DEFINE(HAVE_POSIX_FALLOCATE,, Define if you have a working posix_fallocate())
fi

#
# Figure out if the emulator should use threads. The default is set above
# in the enable_threads variable. It can have the following values:
#
#   no      single-threaded emulator requested
#   yes     multi-threaded emulator requested
#   force   multi-threaded emulator required
#
# EMU_THR_LIB_NAME, EMU_THR_LIBS, EMU_THR_X_LIBS, and EMU_THR_DEFS is
# used by the emulator, and can (but should not) be used by applications
# that only require thread support when the emulator has thread support.
# Other applications should use ETHR_LIB_NAME, ETHR_LIBS, ETHR_X_LIBS,
# and ETHR_DEFS.
#
AC_MSG_CHECKING(whether the emulator should use threads)

EMU_THR_LIB_NAME=
EMU_THR_X_LIBS=
EMU_THR_LIBS=
EMU_THR_DEFS=
emu_threads=no

case "$enable_threads"-"$host_os" in
	*-win32)
		# The windows erlang emulator can never run without threads.
		# It has to be enabled or the emulator will crash. Until that
		# is fixed we force threads on win32.
		enable_threads=force ;;
	yes-osf*)
		# The emulator hang when threads are enabled on osf
		AC_MSG_ERROR(unresolved problems exist with threads on this platform) ;;
	*) ;;
esac

case "$enable_threads"-"$found_threads" in
    force-yes)
	emu_threads=yes
	AC_MSG_RESULT(yes; thread support required and therefore forced) ;;
    yes-yes)
	emu_threads=yes
	AC_MSG_RESULT(yes; enabled by user) ;;
    unknown-yes)
	case $host_os in
	    solaris*|linux*|darwin*|win32|ose)
		emu_threads=yes
		AC_MSG_RESULT(yes; default on this platform)
		;;
	    *)
		AC_MSG_RESULT(no; default on this platform)
		;;
	esac
	;;
    no-yes)
	AC_MSG_RESULT(no; thread support found but disabled by user) ;;
    unknown-no|no-no)
	AC_MSG_RESULT(no) ;;
    force-no)
	AC_MSG_ERROR(thread support required but not found) ;;
    yes-no)
	AC_MSG_ERROR(thread support enabled by user but not found) ;;
    *)
	AC_MSG_ERROR(internal error) ;;
esac

if test $emu_threads != yes; then
	enable_lock_check=no
	enable_lock_count=no
        AC_MSG_CHECKING(whether dirty schedulers should be enabled)
	if test "x$enable_dirty_schedulers" != "xno"; then
	    AC_DEFINE(ERL_NIF_DIRTY_SCHEDULER_SUPPORT, 1, [Dirty scheduler support])
	    AC_DEFINE(ERL_DRV_DIRTY_SCHEDULER_SUPPORT, 1, [Dirty scheduler support])
	    AC_MSG_RESULT(yes)
	else
	    AC_MSG_RESULT(no)
	fi
else
	# Threads enabled for emulator
	EMU_THR_LIB_NAME=$ETHR_LIB_NAME
	EMU_THR_X_LIBS=$ETHR_X_LIBS
	EMU_THR_LIBS=$ETHR_LIBS
	EMU_THR_DEFS=$ETHR_DEFS
	ENABLE_ALLOC_TYPE_VARS="$ENABLE_ALLOC_TYPE_VARS threads"
	AC_MSG_CHECKING(whether lock checking should be enabled)
	AC_MSG_RESULT($enable_lock_check)
	if test "x$enable_lock_check" != "xno"; then
	    EMU_THR_DEFS="$EMU_THR_DEFS -DERTS_ENABLE_LOCK_CHECK"
	fi

	AC_MSG_CHECKING(whether lock counters should be enabled)
	AC_MSG_RESULT($enable_lock_count)
	if test "x$enable_lock_count" != "xno"; then
	    EMU_THR_DEFS="$EMU_THR_DEFS -DERTS_ENABLE_LOCK_COUNT"
	fi

        AC_MSG_CHECKING(whether dirty schedulers should be enabled)
	if test "x$enable_dirty_schedulers" != "xno"; then
	    EMU_THR_DEFS="$EMU_THR_DEFS -DERTS_DIRTY_SCHEDULERS"
	    AC_DEFINE(ERTS_DIRTY_SCHEDULERS, 1, [Define if the emulator supports dirty schedulers])
	    AC_DEFINE(ERL_NIF_DIRTY_SCHEDULER_SUPPORT, 1, [Dirty scheduler support])
	    AC_DEFINE(ERL_DRV_DIRTY_SCHEDULER_SUPPORT, 1, [Dirty scheduler support])
	    AC_MSG_RESULT(yes)
	else
	    AC_MSG_RESULT(no)
	fi

	disable_child_waiter_thread=no
	case $host_os in
	    solaris*)
		enable_child_waiter_thread=yes
		;;
	    linux*)
		AC_MSG_CHECKING([whether dlopen() needs to be called before first call to dlerror()])
		if test "x$ETHR_THR_LIB_BASE_TYPE" != "xposix_nptl"; then
		    AC_DEFINE(ERTS_NEED_DLOPEN_BEFORE_DLERROR,[1],
			[Define if dlopen() needs to be called before first call to dlerror()])
			AC_MSG_RESULT(yes)
		else
			AC_MSG_RESULT(no)
		fi
		if test "x$ETHR_THR_LIB_BASE_TYPE" != "xposix_nptl"; then
		    # Child waiter thread cannot be enabled
		    disable_child_waiter_thread=yes
		    enable_child_waiter_thread=no
		fi
		;;
	    win32|ose)
		# Child waiter thread cannot be enabled
		disable_child_waiter_thread=yes
		enable_child_waiter_thread=no
		;;
	    *)
		;;
	esac

	# Remove -D_WIN32_WINNT*, -DWINVER* and -D_GNU_SOURCE from EMU_THR_DEFS
	# (defined in CFLAGS). Note that we want to keep these flags
	# in ETHR_DEFS, but not in EMU_THR_DEFS.
	new_emu_thr_defs=
	for thr_def in $EMU_THR_DEFS; do
	    case $thr_def in
		-D_GNU_SOURCE*|-D_WIN32_WINNT*|-DWINVER*)
		    ;;
		*)
		    new_emu_thr_defs="$new_emu_thr_defs $thr_def"
		    ;;
	    esac
	done
	EMU_THR_DEFS=$new_emu_thr_defs

	AC_MSG_CHECKING(whether the child waiter thread should be enabled)
	if test $enable_child_waiter_thread = yes; then
	    AC_DEFINE(ENABLE_CHILD_WAITER_THREAD,[1],
		[Define if you want to enable child waiter thread])
	    AC_MSG_RESULT(yes)
	else
	    case $ERTS_BUILD_SMP_EMU-$disable_child_waiter_thread in
		yes-no)
		    AC_MSG_RESULT([yes on SMP build, but not on non-SMP build]);;
		*-yes)
	    	    AC_DEFINE(DISABLE_CHILD_WAITER_THREAD,[1],
			[Define if you want to disable child waiter thread])
		    AC_MSG_RESULT(no);;
		*)
		    AC_MSG_RESULT(no);;
	    esac
	fi
fi

AC_SUBST(EMU_THR_LIB_NAME)
AC_SUBST(EMU_THR_X_LIBS)
AC_SUBST(EMU_THR_LIBS)
AC_SUBST(EMU_THR_DEFS)

if test "x$enable_lock_check" = "xno"; then
    EMU_LOCK_CHECKING=no
else
    EMU_LOCK_CHECKING=yes
fi

AC_SUBST(EMU_LOCK_CHECKING)

ERL_INTERNAL_LIBS

dnl THR_LIBS and THR_DEFS are only used by odbc
THR_LIBS=$ETHR_X_LIBS
THR_DEFS=$ETHR_DEFS

AC_SUBST(THR_LIBS)
AC_SUBST(THR_DEFS)

dnl ----------------------------------------------------------------------
dnl Try to figure out where to get the termcap functions from.
dnl We use tgetent(), tgetflag(), tgetnum(), tgetstr() and tputs()
dnl ----------------------------------------------------------------------

TERMCAP_LIB=

if test "x$with_termcap" != "xno" &&
   test "X$host" != "Xwin32"; then
    # try these libs
    termcap_libs="tinfo ncurses curses termcap termlib"

    for termcap_lib in $termcap_libs; do
	AC_CHECK_LIB($termcap_lib, tgetent, TERMCAP_LIB="-l$termcap_lib")
	if test "x$TERMCAP_LIB" != "x"; then
	    break
	fi
    done

    if test "x$TERMCAP_LIB" = "x"; then
	AC_MSG_ERROR([No curses library functions found])
    fi
fi

AC_SUBST(TERMCAP_LIB)

if test "x$TERMCAP_LIB" != "x"; then

	AC_DEFINE(HAVE_TERMCAP, 1, [Define if termcap functions exists])
fi

if test "X$host" != "Xwin32"; then
    AC_MSG_CHECKING(for wcwidth)
    AC_TRY_LINK([#include <wchar.h>], [wcwidth(0);],
                have_wcwidth=yes, have_wcwidth=no)
    if test $have_wcwidth = yes; then
        AC_MSG_RESULT([yes])
        AC_DEFINE(HAVE_WCWIDTH, [1],
                  [Define to 1 if you have a `wcwidth' function.])
    fi
fi

dnl -------------
dnl zlib
dnl -------------

AC_ARG_ENABLE(builtin-zlib,
  AS_HELP_STRING([--enable-builtin-zlib],
                 [force use of our own built-in zlib]),
  [ case "$enableval" in
      no) enable_builtin_zlib=no ;;
      *)  enable_builtin_zlib=yes ;;
    esac ], enable_builtin_zlib=no)

Z_LIB=

if test "x$enable_builtin_zlib" = "xyes"; then
  AC_MSG_NOTICE([Using our own built-in zlib source])
else
AC_MSG_CHECKING(for zlib 1.2.5 or higher)
zlib_save_LIBS=$LIBS
LIBS="-lz $LIBS"
AC_LINK_IFELSE(
 [AC_LANG_PROGRAM([[
#include "zlib.h"
]],[[
#if ZLIB_VERNUM >= 0x1250
  Bytef s[1];
  s[0] = 0;
  (void) adler32((uLong)0, s, 1);
#else
#error "No zlib 1.2.5 or higher found"
error
#endif
]])],
[
 Z_LIB="-lz"
 AC_DEFINE(HAVE_LIBZ, 1, [Define to 1 if you have the `z' library (-lz).])
 AC_MSG_RESULT(yes)
],[
 AC_MSG_RESULT(no)
])
LIBS=$zlib_save_LIBS
fi
AC_SUBST(Z_LIB)

dnl
dnl This test kindly borrowed from Tcl
dnl
#--------------------------------------------------------------------
#	Check for the existence of the -lsocket and -lnsl libraries.
#	The order here is important, so that they end up in the right
#	order in the command line generated by make.  Here are some
#	special considerations:
#	1. Use "connect" and "accept" to check for -lsocket, and
#	   "gethostbyname" to check for -lnsl.
#	2. Use each function name only once:  can't redo a check because
#	   autoconf caches the results of the last check and won't redo it.
#	3. Use -lnsl and -lsocket only if they supply procedures that
#	   aren't already present in the normal libraries.  This is because
#	   IRIX 5.2 has libraries, but they aren't needed and they're
#	   bogus:  they goof up name resolution if used.
#	4. On some SVR4 systems, can't use -lsocket without -lnsl too.
#	   To get around this problem, check for both libraries together
#	   if -lsocket doesn't work by itself.
#--------------------------------------------------------------------

erl_checkBoth=0
AC_CHECK_FUNC(connect, erl_checkSocket=0, erl_checkSocket=1)
if test "$erl_checkSocket" = 1; then
    AC_CHECK_LIB(socket, main, LIBS="$LIBS -lsocket", erl_checkBoth=1)
fi
if test "$erl_checkBoth" = 1; then
    tk_oldLibs=$LIBS
    LIBS="$LIBS -lsocket -lnsl"
    AC_CHECK_FUNC(accept, erl_checkNsl=0, [LIBS=$tk_oldLibs])
fi
AC_CHECK_FUNC(gethostbyname, , AC_CHECK_LIB(nsl, main, [LIBS="$LIBS -lnsl"]))
AC_CHECK_FUNC(gethostbyname_r,have_gethostbyname_r=yes)

dnl
dnl These gethostbyname thingies use old style AC_DEFINE for BC with ancient 
dnl autoconf...
dnl 

if test "$have_gethostbyname_r" = yes; then
	# OK, so we have gethostbyname_r() - but do we know how to call it...?
	# (if not, HAVE_GETHOSTBYNAME_R will not be defined at all)
	case $host_os in
		solaris2*)
			AC_DEFINE(HAVE_GETHOSTBYNAME_R, GHBN_R_SOLARIS,
				[Define to flavour of gethostbyname_r])
		;;
		aix4*)
			# AIX version also needs "struct hostent_data" defn
			AC_TRY_COMPILE([#include <netdb.h>],
				[struct hostent_data hd;],
				AC_DEFINE(HAVE_GETHOSTBYNAME_R, GHBN_R_AIX,
				    [Define to flavour of gethostbyname_r]))
		;;
		*)
			AC_EGREP_CPP(yes,[#include <stdio.h>
			  #ifdef __GLIBC__
			  yes
			  #endif
			  ], AC_DEFINE(HAVE_GETHOSTBYNAME_R, GHBN_R_GLIBC,
				[Define to flavour of gethostbyname_r]))
		;;
	esac
fi

AC_MSG_CHECKING(for working posix_openpt implementation)
AC_TRY_LINK([
#define _XOPEN_SOURCE 600 
#include <stdlib.h>
#include <fcntl.h>
],
[
    int mfd = posix_openpt(O_RDWR);
    ptsname(mfd);
    grantpt(mfd);
    unlockpt(mfd);
    return mfd;
], working_posix_openpt=yes, working_posix_openpt=no)

if test "X$working_posix_openpt" = "Xyes"; then
    AC_DEFINE(HAVE_WORKING_POSIX_OPENPT, [1],
	      [Define if you have a working posix_openpt implementation])
    AC_MSG_RESULT(yes)
else
    AC_MSG_RESULT(no)
fi

dnl Check for usage of sockaddr_in in netdb.h
dnl somewhat ugly check, I check for presence of the string and that 
dnl compilation works. If either fails I assume it's not needed.
dnl Seems only to be needed on a patched version of solaris2.5.1, with
dnl netdb.h  version  1.18.
AC_MSG_CHECKING([if netdb.h requires netinet/in.h to be previously included])
AC_EGREP_CPP(sockaddr_in, 
	     [#include <netdb.h>],
	     AC_TRY_COMPILE([#include <netinet/in.h>
			     #include <netdb.h>], 
			    [return 0;],
			    need_in_h=yes, 
                            need_in_h=no),
             need_in_h=no)

if test $need_in_h = yes; then
	AC_DEFINE(NETDB_H_NEEDS_IN_H,[1],
		[Define if netdb.h needs struct sockaddr_in ans in.h CAN be included before])
	AC_MSG_RESULT(yes)
else
	AC_MSG_RESULT(no)
fi

dnl Check for type socklen_t
dnl
AC_MSG_CHECKING([for socklen_t])
AC_TRY_COMPILE( [#include <sys/socket.h>], 
		[socklen_t test;],
		have_socklen_t=yes, 
                have_socklen_t=no),

if test $have_socklen_t = yes; then
	AC_DEFINE(HAVE_SOCKLEN_T,[1],[Define if we have socklen_t])
	AC_MSG_RESULT(yes)
else
	AC_MSG_RESULT(no)
fi


dnl h_errno isn't always declared in netdb.h, and with some definitions
dnl (e.g. function call for thread-safe) a simple 'extern int' may conflict
dnl (we do assume that h_errno exists at all...)
AC_CACHE_CHECK([for h_errno declaration in netdb.h],
  ac_cv_decl_h_errno,
[AC_TRY_COMPILE([#include <netdb.h>], [int err = h_errno;],
  ac_cv_decl_h_errno=yes, ac_cv_decl_h_errno=no)])
if test $ac_cv_decl_h_errno = yes; then
  AC_DEFINE(H_ERRNO_DECLARED,[1],
	[define if h_errno is declared (in some way) in a system header file])
fi


dnl ----------------------------------------------------------------------
dnl Checks for header files.
dnl ----------------------------------------------------------------------

dnl We sometimes need EMU_THR_DEFS in order to find certain headers.
saved_cppflags=$CPPFLAGS
CPPFLAGS="$CPPFLAGS $EMU_THR_DEFS"

AC_HEADER_DIRENT
AC_HEADER_STDC
AC_HEADER_SYS_WAIT
AC_HEADER_TIME

dnl Interactive UX needs <net/errno.h> for socket related error codes.
dnl Some Linuxes needs <sys/socketio.h> instead of <sys/sockio.h>
dnl
AC_CHECK_HEADERS(fcntl.h limits.h unistd.h syslog.h dlfcn.h ieeefp.h \
                 sys/types.h sys/stropts.h sys/sysctl.h \
                 sys/ioctl.h sys/time.h sys/uio.h \
                 sys/socket.h sys/sockio.h sys/socketio.h \
                 net/errno.h malloc.h arpa/nameser.h libdlpi.h \
		 pty.h util.h utmp.h langinfo.h poll.h sdkddkver.h)

AC_CHECK_MEMBERS([struct ifreq.ifr_hwaddr], [], [],
	[#ifdef __WIN32__
	 #else
	 #ifdef VXWORKS
	 #else
	 #include <net/if.h>
	 #endif
	 #endif
	])

AC_CHECK_MEMBERS([struct ifreq.ifr_enaddr], [], [],
	[#ifdef __WIN32__
	 #else
	 #ifdef VXWORKS
	 #else
	 #include <net/if.h>
	 #endif
	 #endif
	])

dnl ----------------------------------------------------------------------
dnl  Check the availability of systemd
dnl ----------------------------------------------------------------------
if test x"$enable_systemd" != x"no"; then

systemd_daemon_save_LIBS=$LIBS
LIBS=
AC_SEARCH_LIBS(sd_listen_fds,[systemd systemd-daemon],
  [have_sd_listen_fds=yes],[have_sd_listen_fds=no],$systemd_daemon_save_LIBS)
AC_CHECK_HEADERS(systemd/sd-daemon.h,
  [have_systemd_sd_daemon_h=yes],[have_systemd_sd_daemon_h=no])

if test x"$have_sd_listen_fds" = x"yes" && \
   test x"$have_systemd_sd_daemon_h" = x"yes"; then
  AC_DEFINE([HAVE_SYSTEMD_DAEMON],[1],[Define if you have systemd daemon])
  SYSTEMD_DAEMON_LIBS=$LIBS
elif test x"$enable_systemd" = x"yes"; then
  AC_MSG_FAILURE([--enable-systemd was given, but test for systemd failed])
fi
LIBS=$systemd_daemon_save_LIBS
fi
AC_SUBST(SYSTEMD_DAEMON_LIBS)


dnl ----------------------------------------------------------------------
dnl Check the availability for libdlpi
dnl ----------------------------------------------------------------------
AC_CHECK_LIB(dlpi, dlpi_open)
if test x"$ac_cv_lib_dlpi_dlpi_open" = x"no"; then
   unset -v ac_cv_lib_dlpi_dlpi_open
   dnl Try again now with -L/lib (or ditto 64) as argument to linker since
   dnl gcc makes /usr/ccs/bin/ld ignore the crle configured linker default paths
   dnl typically causing dlpi not being found on Solaris et.al
   save_ldflags="$LDFLAGS"
   try_dlpi_lib=/lib
   if test x"$ac_cv_sizeof_void_p" = x"8"; then
      if test -d /lib64; then
	 try_dlpi_lib=/lib64
      elif test -d /lib/64; then
	 try_dlpi_lib=/lib/64
      fi
   fi
   if test ! -f "$try_dlpi_lib/libdlpi.so" && \
      test -f "$try_dlpi_lib/libdlpi.so.1"
   then
      dnl It looks like there is a missing symlink
      dnl - let's be helpful and notify the user
      dnl NOTE this help is far from perfect e.g if there would be no
      dnl *.so.1 but a *.so.1.123 or *.so.2 this will be no help
      AC_MSG_ERROR(
	[Your OS installation is missing a symbolic link.
	Maybe it lacks some development package(s)...
	It can anyhow be fixed with the following command:
	# ln -s libdlpi.so.1 $try_dlpi_lib/libdlpi.so
	])
   fi
   LDFLAGS="-L$try_dlpi_lib -R$try_dlpi_lib $LDFLAGS"
   unset -v try_dlpi_lib
   AC_MSG_NOTICE([Extending the search to include /lib])
   AC_CHECK_LIB(dlpi, dlpi_open)
   if test x"$ac_cv_lib_dlpi_dlpi_open" = x"no"; then
      LDFLAGS="$save_ldflags"
   fi
   unset -v save_ldflags
fi

AC_CHECK_HEADER(sys/resource.h,
	[AC_DEFINE(HAVE_SYS_RESOURCE_H, 1,
		[Define to 1 if you have the <sys/resource.h> header file])
	 AC_CHECK_DECLS([getrlimit, setrlimit, RLIMIT_STACK],
		[],[],
		[#include <sys/resource.h>])],
	[],[])

dnl Check if we have kernel poll support
have_kernel_poll=no
AC_CHECK_HEADER(sys/event.h, have_kernel_poll=kqueue)
AC_CHECK_HEADER(sys/epoll.h, have_kernel_poll=epoll)
AC_CHECK_HEADER(sys/devpoll.h, have_kernel_poll=/dev/poll)

dnl Check for kernel SCTP support
AC_SUBST(LIBSCTP)
if test "x$enable_sctp" != "xno" ; then
    AC_CHECK_HEADER(netinet/sctp.h,
        [LIBSCTP=libsctp.so.1
	 AC_DEFINE(HAVE_SCTP_H, [1],
            [Define to 1 if you have the <netinet/sctp.h> header file])],
	[],
	[#if HAVE_SYS_SOCKET_H
	 #include <sys/socket.h>
	 #endif
	])
fi

if test x"$ac_cv_header_netinet_sctp_h" = x"yes"; then
    AC_CHECK_FUNCS([sctp_bindx sctp_peeloff sctp_getladdrs sctp_freeladdrs sctp_getpaddrs sctp_freepaddrs])
    AC_CHECK_DECLS([SCTP_UNORDERED, SCTP_ADDR_OVER, SCTP_ABORT,
                    SCTP_EOF, SCTP_SENDALL, SCTP_ADDR_CONFIRMED,
		    SCTP_DELAYED_ACK_TIME,
		    SCTP_EMPTY,
		    SCTP_CLOSED, SCTPS_IDLE,
		    SCTP_BOUND, SCTPS_BOUND,
		    SCTP_LISTEN, SCTPS_LISTEN,
		    SCTP_COOKIE_WAIT, SCTPS_COOKIE_WAIT,
		    SCTP_COOKIE_ECHOED, SCTPS_COOKIE_ECHOED,
		    SCTP_ESTABLISHED, SCTPS_ESTABLISHED,
		    SCTP_SHUTDOWN_PENDING, SCTPS_SHUTDOWN_PENDING,
		    SCTP_SHUTDOWN_SENT, SCTPS_SHUTDOWN_SENT,
		    SCTP_SHUTDOWN_RECEIVED, SCTPS_SHUTDOWN_RECEIVED,
		    SCTP_SHUTDOWN_ACK_SENT, SCTPS_SHUTDOWN_ACK_SENT], [], [],
        [#if HAVE_SYS_SOCKET_H
         #include <sys/socket.h>
         #endif
         #include <netinet/sctp.h>
        ])
    AC_CHECK_MEMBERS([struct sctp_paddrparams.spp_pathmtu,
                      struct sctp_paddrparams.spp_sackdelay,
                      struct sctp_paddrparams.spp_flags,
                      struct sctp_remote_error.sre_data,
                      struct sctp_send_failed.ssf_data], [], [],
        [#if HAVE_SYS_SOCKET_H
         #include <sys/socket.h>
         #endif
         #include <netinet/sctp.h>
        ])
fi

dnl Check for setns
AC_CHECK_HEADERS(sched.h setns.h)
AC_CHECK_FUNCS([setns])

HAVE_VALGRIND=no
AC_CHECK_HEADER(valgrind/valgrind.h, HAVE_VALGRIND=yes)
AC_SUBST(HAVE_VALGRIND)

LM_DECL_SO_BSDCOMPAT
LM_DECL_INADDR_LOOPBACK
LM_DECL_SYS_ERRLIST

AC_CACHE_CHECK([if windows.h includes winsock2.h],
		erts_cv_windows_h_includes_winsock2_h,
		AC_TRY_COMPILE([#include <windows.h>
				],
			       [#ifndef _WINSOCK2API_
				#error winsock2.h not included
				#endif
				int i = 1;
				],
			       erts_cv_windows_h_includes_winsock2_h=yes,
			       erts_cv_windows_h_includes_winsock2_h=no))
if test $erts_cv_windows_h_includes_winsock2_h = yes; then
	AC_DEFINE(WINDOWS_H_INCLUDES_WINSOCK2_H, 1, \
[Define if windows.h includes winsock2.h])
fi

dnl restore CPPFLAGS
CPPFLAGS=$saved_cppflags

dnl ----------------------------------------------------------------------
dnl Checks for typedefs, structures, and compiler characteristics.
dnl ----------------------------------------------------------------------

AC_C_CONST
AC_TYPE_SIGNAL
AC_TYPE_OFF_T
AC_TYPE_PID_T
AC_TYPE_SIZE_T

AC_STRUCT_TM
LM_STRUCT_SOCKADDR_SA_LEN
LM_STRUCT_EXCEPTION

AC_CHECK_SIZEOF(char, 1)
AC_CHECK_SIZEOF(short)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(void *)
AC_CHECK_SIZEOF(long long)
AC_CHECK_SIZEOF(size_t)
AC_CHECK_SIZEOF(off_t)
AC_CHECK_SIZEOF(time_t)

BITS64=

if test $ac_cv_sizeof_void_p = 8; then
  BITS64=yes
fi
AC_SUBST(BITS64)

if test "x$ac_compiler_gnu" = "xyes"; then
AC_MSG_CHECKING([if we should add -fno-tree-copyrename to CFLAGS for computed gotos to work properly])
AC_TRY_COMPILE([],[
		#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
			;
			#else
			#error old and ok
			#endif
			],
			no_tree_copyrename=yes,
			no_tree_copyrename=no)

if test "x$no_tree_copyrename" = "xyes"; then
	CFLAGS="$CFLAGS -fno-tree-copyrename"
	AC_MSG_RESULT(yes, adjusting CFLAGS)
else
	AC_MSG_RESULT(no)
fi



AC_MSG_CHECKING([for broken gcc-4.3.0 compiler])
AC_TRY_RUN([
/* pr36339.c */
extern void abort (void);

typedef unsigned long my_uintptr_t;

int check_a(my_uintptr_t tagged_ptr);

int __attribute__((noinline)) try_a(my_uintptr_t x)
{
  my_uintptr_t heap[2];
  my_uintptr_t *hp = heap;

  hp[0] = x;
  hp[1] = 0;
  return check_a((my_uintptr_t)(void*)((char*)hp + 1));
}

int __attribute__((noinline)) check_a(my_uintptr_t tagged_ptr)
{
  my_uintptr_t *hp = (my_uintptr_t*)(void*)((char*)tagged_ptr - 1);

  if (hp[0] == 42 && hp[1] == 0)
    return 0;
  return -1;
}

int main(void)
{
  if (try_a(42) < 0)
    abort ();
  return 0;
}
], gcc_4_3_0_bug=no, gcc_4_3_0_bug=yes, gcc_4_3_0_bug=cross)

case $gcc_4_3_0_bug in
	yes|no)
		gcc_4_3_0_bug_result=$gcc_4_3_0_bug;;
	cross)
		gcc_dumped_vsn=`$CC -dumpversion 2>/dev/null`
		case gcc-$gcc_dumped_vsn in
			gcc-4.3.0) gcc_4_3_0_bug=yes;;
			*) gcc_4_3_0_bug=no;;
		esac
		gcc_4_3_0_bug_result="$gcc_4_3_0_bug; could not run test since cross compiling, checked version number ($gcc_dumped_vsn) instead";;
esac

AC_MSG_RESULT([$gcc_4_3_0_bug_result])
if test $gcc_4_3_0_bug = yes; then
	AC_MSG_ERROR([This gcc miscompiles the Erlang runtime system; please use a different version])	
fi

fi

case X$erl_xcomp_bigendian in
    X) ;;
    Xyes|Xno) ac_cv_c_bigendian=$erl_xcomp_bigendian;;
    *) AC_MSG_ERROR([Bad erl_xcomp_bigendian value: $erl_xcomp_bigendian]);;
esac

AC_C_BIGENDIAN
AC_C_DOUBLE_MIDDLE_ENDIAN

dnl fdatasync syscall (Unix only)
AC_CHECK_FUNCS([fdatasync])

dnl Find which C libraries are required to use fdatasync
dnl TODO: Remove check once SunOS >= 5.11 is required by erts.
dnl       fdatasync requires linking against -lrt on SunOS <= 5.10.
dnl       OpenSolaris 2009.06 is SunOS 5.11 and does not require -lrt.
AC_SEARCH_LIBS(fdatasync, [rt])


dnl sendfile syscall
case $host_os in
    linux*|freebsd*|dragonfly*|darwin*)
		AC_CHECK_FUNCS([sendfile])
		;;
    solaris*)
		AC_SEARCH_LIBS(sendfilev, sendfile,
			AC_DEFINE([HAVE_SENDFILEV],[1],
		           [Define to 1 if you have the `sendfilev' function.]))
		;;
    win32)
		LIBS="$LIBS -lmswsock"
		;;
    *)
		;;
esac

dnl ----------------------------------------------------------------------
dnl Checks for library functions.
dnl ----------------------------------------------------------------------

dnl We may need the thread library and thread flags in order to find right stuff
saved_cppflags=$CPPFLAGS
CPPFLAGS="$CPPFLAGS $EMU_THR_DEFS"
saved_libs=$LIBS
LIBS="$LIBS $EMU_THR_X_LIBS"

dnl Check if we have these, in which case we'll try to build
dnl inet_gethost with ipv6 support.
AC_CHECK_HEADERS(windows.h)
AC_CHECK_HEADERS(winsock2.h)
AC_CHECK_HEADERS(ws2tcpip.h,[],[],[
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#endif
])
dnl AC_CHECK_FUNC(getaddrinfo, have_getaddrinfo=yes, have_getaddrinfo=no)
AC_MSG_CHECKING(for getaddrinfo)
AC_TRY_LINK([
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#endif
#ifdef HAVE_WS2TCPIP_H
#include <ws2tcpip.h>
#endif
#ifndef __WIN32__
#include <sys/socket.h>
#include <netdb.h>
#endif
], 
[
getaddrinfo("","",NULL,NULL);
],have_getaddrinfo=yes, have_getaddrinfo=no)
if test $have_getaddrinfo = yes; then
        AC_MSG_RESULT([yes])
        AC_MSG_CHECKING([whether getaddrinfo accepts enough flags])
        AC_TRY_COMPILE([
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#endif
#ifdef HAVE_WS2TCPIP_H
#include <ws2tcpip.h>
#endif
#ifndef __WIN32__
#include <sys/socket.h>
#include <netdb.h>
#endif
],
[
    struct addrinfo hints, *ai;
    memset(&hints, 0, sizeof(hints));
    hints.ai_flags = AI_CANONNAME;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_family = AF_INET6;
    if (getaddrinfo("::", NULL, &hints, &ai) == 0) {
	freeaddrinfo(ai);
	exit(0);
    } else {
	exit(1);
    }
],, have_getaddrinfo=no)
	AC_MSG_RESULT($have_getaddrinfo)
	case $have_getaddrinfo in
	    yes)
		AC_DEFINE(HAVE_GETADDRINFO, [1], 
		          [Define to 1 if you have a good `getaddrinfo' function.]);;
	    *) ;;
	esac
else
    AC_MSG_RESULT([no])
fi
AC_MSG_CHECKING(for getnameinfo)
AC_TRY_LINK([
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#endif
#ifdef HAVE_WS2TCPIP_H
#include <ws2tcpip.h>
#endif
#ifndef __WIN32__
#include <sys/socket.h>
#include <netdb.h>
#endif
], 
[
getnameinfo(NULL,0,NULL,0,NULL,0,0);
],have_getnameinfo=yes, have_getnameinfo=no)
if test $have_getnameinfo = yes; then
        AC_MSG_RESULT([yes])
	AC_DEFINE(HAVE_GETNAMEINFO, [1], 
		  [Define to 1 if you have a good `getnameinfo' function.])
else
	AC_MSG_RESULT([no])	  
fi


AC_CHECK_FUNCS([getipnodebyname getipnodebyaddr gethostbyname2])

AC_CHECK_FUNCS([ieee_handler fpsetmask finite isnan isinf res_gethostbyname dlopen \
		pread pwrite memmove strerror strerror_r strncasecmp \
		gethrtime localtime_r gmtime_r inet_pton \
		memcpy mallopt sbrk _sbrk __sbrk brk _brk __brk \
		flockfile fstat strlcpy strlcat setsid posix2time time2posix \
		setlocale nl_langinfo poll mlockall])


case X$erl_xcomp_posix_memalign in
     Xno) ;;
     Xyes) AC_DEFINE(HAVE_POSIX_MEMALIGN,[1],
                [Define to 1 if you have the `posix_memalign' function.]) ;;
     *)
	AC_CHECK_FUNC(
		[posix_memalign],
                [if test "$cross_compiling" != yes; then
AC_TRY_RUN([
#include <stdlib.h>
int main(void) {
    void *ptr = NULL;
    int error;
    size_t alignment = 0x40000, size = 0x20028;
    if ((error = posix_memalign(&ptr, alignment, size)) != 0 || ptr == NULL)
      return error;
    return 0;
}
],AC_DEFINE(HAVE_POSIX_MEMALIGN,[1],
    [Define to 1 if you have the `posix_memalign' function.])
)
		 else
			AC_DEFINE(HAVE_POSIX_MEMALIGN,[1],
		[Define to 1 if you have the `posix_memalign' function.])
		 fi]);;
esac

dnl writev on OS X snow leopard is broken for files > 4GB
case $host_os in
        darwin10.8.0)
	    AC_MSG_CHECKING([for writev])
	    AC_MSG_RESULT(no, not stable on OS X Snow Leopard) ;;
        *)
	    AC_CHECK_FUNCS([writev]) ;;
esac

case $host_os in
        *ose)
	    AC_MSG_CHECKING([for mmap])
	    AC_MSG_RESULT(not using for OSE)
	    AC_MSG_CHECKING([for mremap])
	    AC_MSG_RESULT(not using for OSE) ;;
        *)
	    AC_CHECK_FUNCS([mmap mremap]) ;;
esac


AC_CHECK_DECLS([posix2time, time2posix],,,[#include <time.h>])

disable_vfork=false
if test "x$EMU_THR_LIB_NAME" != "x"; then
	AC_MSG_CHECKING([if vfork is known to hang multithreaded applications])
	case $host_os in
		osf*)
			AC_MSG_RESULT(yes)
			disable_vfork=true;;
		*)
			AC_MSG_RESULT(no);;
	esac
fi

if test $disable_vfork = false; then
	AC_FUNC_VFORK
	if test $ac_cv_func_vfork_works = no; then
		disable_vfork=true
	fi
fi

if test $disable_vfork = true; then
	AC_DEFINE(DISABLE_VFORK, 1, [Define if you want to disable vfork.])
fi

AC_FUNC_VPRINTF

dnl The AC_DEFINEs are necessary for autoheader to work. :-(
dnl for gzio
LM_CHECK_FUNC_DECL(fread, [extern int fread();],,
                   AC_DEFINE(HAVE_CONFLICTING_FREAD_DECLARATION,[1],[Define if you have a decl of fread that conflicts with int fread]))

dnl Checking with TRY_LINK since putc_unlocked might be (probably is) a macro
AC_CACHE_CHECK([for putc_unlocked],
	erts_cv_putc_unlocked,
	AC_TRY_LINK([#include <stdio.h>],
		[int res = putc_unlocked('x',stdout);],
		erts_cv_putc_unlocked=yes,
             	erts_cv_putc_unlocked=no))
if test $erts_cv_putc_unlocked = yes; then
	AC_DEFINE(HAVE_PUTC_UNLOCKED, 1, [Define if you have putc_unlocked])
fi

dnl Checking with TRY_LINK since fwrite_unlocked might be a macro
AC_CACHE_CHECK([for fwrite_unlocked],
	erts_cv_fwrite_unlocked,
	AC_TRY_LINK([#include <stdio.h>],
		[size_t res = fwrite_unlocked(NULL,sizeof(char),0,stdout);],
		erts_cv_fwrite_unlocked=yes,
             	erts_cv_fwrite_unlocked=no))
if test $erts_cv_fwrite_unlocked = yes; then
	AC_DEFINE(HAVE_FWRITE_UNLOCKED, 1, [Define if you have fwrite_unlocked])
fi

dnl Need by run_erl.
AC_CHECK_FUNCS([openpty])

AC_CHECK_HEADERS(net/if_dl.h ifaddrs.h netpacket/packet.h)
AC_CHECK_FUNCS([getifaddrs])

dnl Checks for variables in6addr_any and in6addr_loopback,
dnl
dnl They normally declared by netinet/in.h, according to POSIX,
dnl but not on Windows 7 (Windows SDK 7.1).  I would have liked
dnl to just write AC_CHECK_DECL([in6addr_any], ...) but if doing so,
dnl the configure check fails erroneously on Linux with the error
dnl "cannot convert to a pointer type", on a line looking like
dnl "char *p = (char *) in6addr_any;", so work around that
dnl with some more code. 
AC_CACHE_CHECK(
    [whether in6addr_any is declared],
    [erts_cv_have_in6addr_any],
    [AC_LINK_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#include <sys/types.h>
		#include <sys/socket.h>
		#include <netinet/in.h>
	    ]],
	    [[printf("%d", in6addr_any.s6_addr[16]);]]
	)],
	[erts_cv_have_in6addr_any=yes],
	[erts_cv_have_in6addr_any=no]
    )]
)

case "$erts_cv_have_in6addr_any" in
 yes)
   AC_DEFINE([HAVE_IN6ADDR_ANY], [1],
             [Define to 1 if you have the variable in6addr_any declared.])
esac

AC_CACHE_CHECK(
    [whether in6addr_loopback is declared],
    [erts_cv_have_in6addr_loopback],
    [AC_LINK_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#include <sys/types.h>
		#include <sys/socket.h>
		#include <netinet/in.h>
	    ]],
	    [[printf("%d", in6addr_loopback.s6_addr[16]);]]
	)],
	[erts_cv_have_in6addr_loopback=yes],
	[erts_cv_have_in6addr_loopback=no]
    )]
)

case "$erts_cv_have_in6addr_loopback" in
 yes)
   AC_DEFINE([HAVE_IN6ADDR_LOOPBACK], [1],
             [Define to 1 if you have the variable in6addr_loopback declared.])
esac

AC_CHECK_DECLS([IN6ADDR_ANY_INIT, IN6ADDR_LOOPBACK_INIT, IPV6_V6ONLY], [], [],
	       [
		#include <sys/types.h>
		#include <sys/socket.h>
		#include <netinet/in.h>
	       ])

dnl ----------------------------------------------------------------------
dnl Checks for features/quirks in the system that affects Erlang.
dnl ----------------------------------------------------------------------

AC_MSG_CHECKING([for sched_getaffinity/sched_setaffinity])
AC_TRY_COMPILE([#include <sched.h>],
[
#ifndef CPU_SETSIZE
#error no CPU_SETSIZE
#endif
	int res;
	cpu_set_t cpuset;
	CPU_ZERO(&cpuset);
	CPU_SET(1, &cpuset);
	res = sched_setaffinity(0, sizeof(cpu_set_t), &cpuset);
	res = sched_getaffinity(0, sizeof(cpu_set_t), &cpuset);
	res = CPU_ISSET(1, &cpuset);
	CPU_CLR(1, &cpuset);
],
		sched_xetaffinity=yes,
		sched_xetaffinity=no)
AC_MSG_RESULT([$sched_xetaffinity])
if test $sched_xetaffinity = yes; then
	AC_DEFINE(HAVE_SCHED_xETAFFINITY, 1, [Define if you have sched_getaffinity/sched_setaffinity])
fi


AC_MSG_CHECKING([for pset functionality])
AC_TRY_COMPILE([#include <sys/pset.h>],
[
	int res;
	psetid_t id = PS_MYID;
	int type = PS_PRIVATE;
	uint_t numcpus = 1024;
	processorid_t cpulist[1024];

	res = pset_info(id, &type, &numcpus, &cpulist[0]);
],
		pset_functionality=yes,
		pset_functionality=no)
AC_MSG_RESULT([$pset_functionality])
if test $pset_functionality = yes; then
	AC_DEFINE(HAVE_PSET, 1, [Define if you have pset functionality])
fi

AC_MSG_CHECKING([for processor_bind functionality])
AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/processor.h>
#include <sys/procset.h>
],
[
	int res = processor_bind(P_LWPID, P_MYID, PBIND_NONE, NULL);
],
		processor_bind_functionality=yes,
		processor_bind_functionality=no)
AC_MSG_RESULT([$processor_bind_functionality])
if test $processor_bind_functionality = yes; then
	AC_DEFINE(HAVE_PROCESSOR_BIND, 1, [Define if you have processor_bind functionality])
fi

AC_MSG_CHECKING([for cpuset_getaffinity/cpuset_setaffinity])
AC_TRY_COMPILE([
#include <sys/param.h>
#include <sys/cpuset.h>
],
[
	int res;
	cpuset_t cpuset;
	CPU_ZERO(&cpuset);
	CPU_SET(1, &cpuset);
	res = cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1, sizeof(cpuset_t), &cpuset);
	res = cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1, sizeof(cpuset_t), &cpuset);
	res = CPU_ISSET(1, &cpuset);
	CPU_CLR(1, &cpuset);
],
		cpuset_xetaffinity=yes,
		cpuset_xetaffinity=no)
AC_MSG_RESULT([$cpuset_xetaffinity])
if test $cpuset_xetaffinity = yes; then
	AC_DEFINE(HAVE_CPUSET_xETAFFINITY, 1, [Define if you have cpuset_getaffinity/cpuset_setaffinity])
fi

AC_CACHE_CHECK([for 'end' symbol],
		erts_cv_have_end_symbol,
		[AC_TRY_LINK([],
			[extern char end; {char *x = &end; *x= 0;}],
			erts_cv_have_end_symbol=yes,
			erts_cv_have_end_symbol=no)])
if test $erts_cv_have_end_symbol = yes; then
	AC_DEFINE(HAVE_END_SYMBOL, 1, [Define if you have the 'end' symbol])
fi

AC_CACHE_CHECK([for '_end' symbol],
		erts_cv_have__end_symbol,
		[AC_TRY_LINK([],
			[extern char _end; {char *x = &_end; *x= 0;}],
			erts_cv_have__end_symbol=yes,
			erts_cv_have__end_symbol=no)])
if test $erts_cv_have__end_symbol = yes; then
	AC_DEFINE(HAVE__END_SYMBOL, 1, [Define if you have the '_end' symbol])
fi

AC_CACHE_CHECK([if __after_morecore_hook can track malloc()s core memory use],
		erts_cv___after_morecore_hook_can_track_malloc,
		[AC_TRY_RUN([
#include <stdlib.h>
#ifdef HAVE_MALLOC_H
#  include <malloc.h>
#endif
#if defined(HAVE_END_SYMBOL)
extern char end;
#elif defined(HAVE__END_SYMBOL)
extern char _end;
#endif
#ifndef USE_THREADS
#undef ETHR_PTHREADS
#endif

#ifdef ETHR_PTHREADS
#  ifdef ETHR_HAVE_PTHREAD_H
#    include <pthread.h>
#  else
#    ifdef ETHR_HAVE_MIT_PTHREAD_H
#      include <pthread/mit/pthread.h>
#    endif
#  endif
#  define N_THR 5
#else
#  define N_THR 1
#endif

static char *heap_start = NULL;
static char *heap_end = NULL;

void update_heap_size(void)
{
    heap_end = (char *) sbrk(0);
}

void init_hook(void)
{
#if defined(HAVE_END_SYMBOL)
    heap_start = &end;
#elif defined(HAVE__END_SYMBOL)
    heap_start = &_end;
#else
    heap_start = sbrk(0);
#endif
    __after_morecore_hook = update_heap_size;
}

void (*__malloc_initialize_hook) (void) = init_hook;

static int
check_malloc(int size)
{
    char *p = (char *) malloc(size);
    if (!heap_start || !heap_end) return 0;
    if (!p) return 0;
    if (p < heap_start || heap_end <= p) return 0;
    if (p + size < heap_start || heap_end < p + size) return 0;
    return 1;
}

#ifdef ETHR_PTHREADS
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
#endif

static void *
do_tests(void *vresp)
{
    int i, ok = 0;
#ifdef ETHR_PTHREADS
    if (pthread_mutex_lock(&mutex) != 0)
	return NULL;
#endif

    for (i = 0; i < 10; i++)
	if (!check_malloc(1000))
	    goto failed;
    for (i = 0; i < 100; i++)
	if (!check_malloc(1))
	    goto failed;
    if (!check_malloc(1024*1024+1))
	goto failed;
    if (!check_malloc(10*1024*1024+1))
	goto failed;
    ok = 1;

 failed:
#ifdef ETHR_PTHREADS
    if (pthread_mutex_unlock(&mutex) != 0)
	return NULL;
#endif
    if (ok)
	*((int *) vresp) = 0;
    return NULL;
}


int main(void)
{
    int res[N_THR], i;
#ifdef ETHR_PTHREADS
    pthread_t tid[N_THR];
#endif

#if defined(HAVE_MALLOPT) && defined(M_MMAP_MAX)
    (void) mallopt(M_MMAP_MAX, 0);
#endif

    for (i = 0; i < N_THR; i++)
	res[i] = 1;
#ifdef ETHR_PTHREADS
    for (i = 1; i < N_THR; i++)
	if (pthread_create(&tid[i], NULL, do_tests, &res[i]) != 0)
	    return 1;
#endif
    (void) do_tests(&res[0]);
#ifdef ETHR_PTHREADS
    for (i = 1; i < N_THR; i++)
	if (pthread_join(tid[i], NULL) != 0)
	    return 1;
#endif
    for (i = 0; i < N_THR; i++)
	if (res[i])
	    return 1;
    return 0;
}
	],
	erts_cv___after_morecore_hook_can_track_malloc=yes,
	erts_cv___after_morecore_hook_can_track_malloc=no,
	[
	case X$erl_xcomp_after_morecore_hook in
	    X) erts_cv___after_morecore_hook_can_track_malloc=cross;;
	    Xyes|Xno) erts_cv___after_morecore_hook_can_track_malloc=$erl_xcomp_after_morecore_hook;;
	    *) AC_MSG_ERROR([Bad erl_xcomp_after_morecore_hook value: $erl_xcomp_after_morecore_hook]);;
	esac
	]
	)])

case $erts_cv___after_morecore_hook_can_track_malloc in
	yes) AC_DEFINE(ERTS___AFTER_MORECORE_HOOK_CAN_TRACK_MALLOC, 1, \
[Define if __after_morecore_hook can track malloc()s core memory use.]);;
	cross) AC_MSG_WARN([result no guessed because of cross compilation]);;
	*) ;;
esac

if test "x$ac_cv_func_sbrk" = "xyes"; then
    AC_CACHE_CHECK([types of sbrk()s return value and argument],
		    erts_cv_sbrk_ret_arg_types,
		    [

	erts_cv_sbrk_ret_arg_types=unknown
	ret_types="void *,char *"
	arg_types="intptr_t,ptrdiff_t,int,long"
	save_ifs="$IFS"; IFS=","
	for rtype in $ret_types; do
	    for atype in $arg_types; do
		IFS=$save_ifs
		AC_TRY_COMPILE([#include <sys/types.h>
				#include <unistd.h>],
				[$rtype sbrk($atype incr);],
				[erts_cv_sbrk_ret_arg_types="$rtype,$atype"])
		IFS=","
		if test "$erts_cv_sbrk_ret_arg_types" != "unknown"; then
		    break 2
		fi
	    done
	done
	IFS=$save_ifs])
    
    if test "$erts_cv_sbrk_ret_arg_types" != "unknown"; then
	save_ifs="$IFS"; IFS=","
	read ret_type arg_type <<EOF
$erts_cv_sbrk_ret_arg_types
EOF
	IFS=$save_ifs
	AC_DEFINE_UNQUOTED(SBRK_RET_TYPE, $ret_type, \
[Define the sbrk() return type.])
	AC_DEFINE_UNQUOTED(SBRK_ARG_TYPE, $arg_type, \
[Define the sbrk() argument type.])
    fi
fi

if test $ac_cv_func_brk = yes; then
    AC_CACHE_CHECK([types of brk()s return value and argument],
		    erts_cv_brk_ret_arg_types,
		    [

	erts_cv_brk_ret_arg_types=unknown
	ret_types="int,long,char *,void *"
	arg_types="void *,const void *,char *,const char *"
	save_ifs="$IFS"; IFS=","
	for rtype in $ret_types; do
	    for atype in $arg_types; do
		IFS=$save_ifs
		AC_TRY_COMPILE([#include <sys/types.h>
				#include <unistd.h>],
				[$rtype brk($atype endds);],
				[erts_cv_brk_ret_arg_types="$rtype,$atype"])
		IFS=","
		if test "$erts_cv_brk_ret_arg_types" != "unknown"; then
		    break 2
		fi
	    done
	done
	IFS=$save_ifs])
    
    if test "$erts_cv_brk_ret_arg_types" != "unknown"; then
	save_ifs="$IFS"; IFS=","
	read ret_type arg_type <<EOF
$erts_cv_brk_ret_arg_types
EOF
	IFS=$save_ifs
	AC_DEFINE_UNQUOTED(BRK_RET_TYPE, $ret_type, \
[Define the brk() return type.])
	AC_DEFINE_UNQUOTED(BRK_ARG_TYPE, $arg_type, \
[Define the brk() argument type.])
    fi

fi

if test $ac_cv_func_sbrk = yes; then

    AC_CACHE_CHECK([if sbrk()/brk() wrappers can track malloc()s core memory use],
		    erts_cv_brk_wrappers_can_track_malloc,
		    [AC_TRY_RUN([
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#ifdef HAVE_DLFCN_H
#  include <dlfcn.h>
#endif

/*
 * Our implementation requires that we have sbrk(), and 'end' or '_end'.
 */

#if !defined(HAVE_SBRK)
#  error no sbrk()
#endif
#if defined(HAVE_END_SYMBOL)
extern char end;
#elif defined(HAVE__END_SYMBOL)
extern char _end;
#else
#  error no 'end' nor '_end'
#endif

#ifndef USE_THREADS
#undef ETHR_PTHREADS
#endif

#ifdef ETHR_PTHREADS
#  ifdef ETHR_HAVE_PTHREAD_H
#    include <pthread.h>
#  else
#    ifdef ETHR_HAVE_MIT_PTHREAD_H
#      include <pthread/mit/pthread.h>
#    endif
#  endif
#  define N_THR 5
#else
#  define N_THR 1
#endif

#define SBRK_IMPL(RET_TYPE, SBRK, ARG_TYPE)				\
RET_TYPE SBRK (ARG_TYPE);						\
static RET_TYPE (*real_ ## SBRK)(ARG_TYPE) = NULL;			\
RET_TYPE								\
SBRK (ARG_TYPE arg)							\
{									\
    RET_TYPE res;							\
    if (!real_ ## SBRK) real_ ## SBRK = dlsym(RTLD_NEXT, #SBRK);	\
    res = (*real_ ## SBRK)(arg);					\
    if (res != (RET_TYPE) -1) heap_end = (char *) (*real_ ## SBRK)(0);	\
    return res;								\
}

#define BRK_IMPL(RET_TYPE, BRK, ARG_TYPE)				\
RET_TYPE BRK (ARG_TYPE);						\
static RET_TYPE (*real_ ## BRK)(ARG_TYPE) = NULL;			\
RET_TYPE								\
BRK (ARG_TYPE arg)							\
{									\
    RET_TYPE res;							\
    if (!real_ ## BRK) real_ ## BRK = dlsym(RTLD_NEXT, #BRK);		\
    res = (*real_ ## BRK)(arg);						\
    if (res != (RET_TYPE) -1) heap_end = (char *) arg;			\
    return res;								\
}

static char *heap_start = NULL;
static char *heap_end = NULL;

SBRK_IMPL(SBRK_RET_TYPE, sbrk, SBRK_ARG_TYPE)
#ifdef HAVE_BRK
   BRK_IMPL(BRK_RET_TYPE, brk, BRK_ARG_TYPE)
#endif

#ifdef HAVE__SBRK
   SBRK_IMPL(SBRK_RET_TYPE, _sbrk, SBRK_ARG_TYPE)
#endif
#ifdef HAVE__BRK
   BRK_IMPL(BRK_RET_TYPE, _brk, BRK_ARG_TYPE)
#endif

#ifdef HAVE___SBRK
   SBRK_IMPL(SBRK_RET_TYPE, __sbrk, SBRK_ARG_TYPE)
#endif
#ifdef HAVE___BRK
   BRK_IMPL(BRK_RET_TYPE, __brk, BRK_ARG_TYPE)
#endif

static int
check_malloc(int size)
{
    char *p = (char *) malloc(size);
    if (!heap_start || !heap_end) return 0;
    if (!p) return 0;
    if (p < heap_start || heap_end <= p) return 0;
    if (p + size < heap_start || heap_end < p + size) return 0;
    return 1;
}

#ifdef ETHR_PTHREADS
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
#endif

static void *
do_tests(void *vresp)
{
    int i, ok = 0;
#ifdef ETHR_PTHREADS
    if (pthread_mutex_lock(&mutex) != 0)
	return NULL;
#endif

    for (i = 0; i < 10; i++)
	if (!check_malloc(1000))
	    goto failed;
    for (i = 0; i < 100; i++)
	if (!check_malloc(1))
	    goto failed;
    if (!check_malloc(1024*1024+1))
	goto failed;
    if (!check_malloc(10*1024*1024+1))
	goto failed;
    ok = 1;

 failed:
#ifdef ETHR_PTHREADS
    if (pthread_mutex_unlock(&mutex) != 0)
	return NULL;
#endif
    if (ok)
	*((int *) vresp) = 0;
    return NULL;
}


int main(void)
{
    int res[N_THR], i;
#ifdef ETHR_PTHREADS
    pthread_t tid[N_THR];
#endif
#if defined(HAVE_END_SYMBOL)
    heap_start = &end;
#elif defined(HAVE__END_SYMBOL)
    heap_start = &_end;
#endif

#if defined(HAVE_MALLOPT) && defined(M_MMAP_MAX)
    (void) mallopt(M_MMAP_MAX, 0);
#endif

    for (i = 0; i < N_THR; i++)
	res[i] = 1;
#ifdef ETHR_PTHREADS
    for (i = 1; i < N_THR; i++)
	if (pthread_create(&tid[i], NULL, do_tests, &res[i]) != 0)
	    return 1;
#endif
    (void) do_tests(&res[0]);
#ifdef ETHR_PTHREADS
    for (i = 1; i < N_THR; i++)
	if (pthread_join(tid[i], NULL) != 0)
	    return 1;
#endif
    for (i = 0; i < N_THR; i++)
	if (res[i])
	    return 1;
    return 0;
}
	],
	    erts_cv_brk_wrappers_can_track_malloc=yes,
	    erts_cv_brk_wrappers_can_track_malloc=no,
	    [
	    case X$erl_xcomp_dlsym_brk_wrappers in
		X) erts_cv_brk_wrappers_can_track_malloc=cross;;
		Xyes|Xno) erts_cv_brk_wrappers_can_track_malloc=$erl_xcomp_dlsym_brk_wrappers;;
		*) AC_MSG_ERROR([Bad erl_xcomp_dlsym_brk_wrappers value: $erl_xcomp_dlsym_brk_wrappers]);;
	    esac
	    ])])
	case $erts_cv_brk_wrappers_can_track_malloc in
	    yes)
		AC_DEFINE(ERTS_BRK_WRAPPERS_CAN_TRACK_MALLOC, 1, \
[Define if sbrk()/brk() wrappers can track malloc()s core memory use]);;
	    cross)
		AC_MSG_WARN([result no guessed because of cross compilation]);;
	    *) ;;
	esac
fi

dnl Restore LIBS
LIBS=$saved_libs
dnl restore CPPFLAGS
CPPFLAGS=$saved_cppflags

LM_SYS_IPV6
LM_SYS_MULTICAST
ERL_TIME_CORRECTION
AC_CHECK_PROG(M4, m4, m4)
dnl check to auto-enable hipe here...
if test "$cross_compiling" != "yes" && test X${enable_hipe} != Xno; then
  if test -z "$M4"; then
	enable_hipe=no
   	AC_MSG_NOTICE([HiPE disabled as no valid m4 is found in PATH])
  elif test "$enable_halfword_emulator" = "yes"; then
       if test X${enable_hipe} = Xyes; then
              AC_MSG_ERROR([HiPE can not be combined with halfword emulator (yet)])
       else		    
   	      AC_MSG_NOTICE([HiPE auto-disabled on halfword emulator])
       fi	
  else
  	case "$ARCH-$OPSYS" in
	    x86-linux|amd64-linux|x86-darwin*|amd64-darwin*|ppc-linux|ppc64-linux|ppc-darwin|arm-linux|amd64-freebsd|x86-freebsd|x86-sol2|amd64-sol2|ultrasparc-linux)
      		enable_hipe=yes
      		;;	
  	esac
  fi
fi

case $ARCH-$OPSYS in
	amd64-darwin*|x86-darwin*)
		AC_MSG_CHECKING([For modern (leopard) style mcontext_t])
		AC_TRY_COMPILE([
				#include <stdlib.h>
				#include <sys/types.h>
				#include <unistd.h>
				#include <mach/mach.h>
				#include <pthread.h>
				#include <machine/signal.h>
				#include <ucontext.h>
				],[
				#if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__)
				#define __DARWIN__ 1
				#endif

				#ifndef __DARWIN__
				#error inpossible
				#else

				mcontext_t mc = NULL;
				int x = mc->__fs.__fpu_mxcsr;

				#endif
				],darwin_mcontext_leopard=yes,
				darwin_mcontext_leopard=no)
				if test X"$darwin_mcontext_leopard" = X"yes"; then
				   AC_DEFINE(DARWIN_MODERN_MCONTEXT,[],[Modern style mcontext_t in MacOSX])
				   AC_MSG_RESULT(yes)
				else
				   AC_MSG_RESULT(no)
				fi
		;;
	*)
		darwin_mcontext_leopard=no
		;;
esac

if test X${enable_fp_exceptions} = Xauto ; then
   case $host_os in
   	*linux*)
	      enable_fp_exceptions=no
	      AC_MSG_NOTICE([Floating point exceptions disabled by default on Linux]) ;;
	darwin*)
	      enable_fp_exceptions=no
	      AC_MSG_NOTICE([Floating point exceptions disabled by default on MacOS X]) ;;
	      *)
	      ;;
    esac
fi

if test X${enable_fp_exceptions} = Xauto ; then
   if test X${enable_hipe} = Xyes; then
      enable_fp_exceptions=yes
   else
      enable_fp_exceptions=no
   AC_MSG_NOTICE([Floating point exceptions disabled by default in this configuration])
   fi
fi	 

if test X${enable_fp_exceptions} != Xyes ; then
    AC_DEFINE(NO_FPE_SIGNALS,[],[Define if floating points exceptions are non-existing/not reliable])
    FPE=unreliable
else

    AC_MSG_CHECKING([for unreliable floating point execptions])


    AC_TRY_RUN([
/* fpe-test.c */
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>

volatile int erl_fp_exception;

/*
 * We expect a single SIGFPE in this test program.
 * Getting many more indicates an inadequate SIGFPE handler,
 * e.g. using the generic handler on x86.
 */
static void new_fp_exception(void)
{
    if (++erl_fp_exception > 50) {
	fprintf(stderr, "SIGFPE loop detected, bailing out\n");
	exit(1);
    }
}

/* Is there no standard identifier for Darwin/MacOSX ? */
#if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__)
#define __DARWIN__ 1
#endif

/*
 * Implement unmask_fpe() and check_fpe() based on CPU/OS combination
 */

#if (defined(__i386__) || defined(__x86_64__)) && defined(__GNUC__) && !defined(__CYGWIN__) && !defined(__MINGW32__)

static void unmask_x87(void)
{
    unsigned short cw;
    __asm__ __volatile__("fstcw %0" : "=m"(cw));
    cw &= ~(0x01|0x04|0x08);   /* unmask IM, ZM, OM */
    __asm__ __volatile__("fldcw %0" : : "m"(cw));
}

static void unmask_sse2(void)
{
    unsigned int mxcsr;
    __asm__ __volatile__("stmxcsr %0" : "=m"(mxcsr));
    mxcsr &= ~(0x003F|0x0680); /* clear exn flags, unmask OM, ZM, IM (not PM, UM, DM) */
    __asm__ __volatile__("ldmxcsr %0" : : "m"(mxcsr));
}

#if defined(__x86_64__)

static inline int cpu_has_sse2(void) { return 1; }

#else /* !__x86_64__ */

/*
 * Check if an x86-32 processor has SSE2.
 */
static unsigned int xor_eflags(unsigned int mask)
{
    unsigned int eax, edx;

    eax = mask;			/* eax = mask */
    __asm__("pushfl\n\t"
	    "popl %0\n\t"	/* edx = original EFLAGS */
	    "xorl %0, %1\n\t"	/* eax = mask ^ EFLAGS */
	    "pushl %1\n\t"
	    "popfl\n\t"		/* new EFLAGS = mask ^ original EFLAGS */
	    "pushfl\n\t"
	    "popl %1\n\t"	/* eax = new EFLAGS */
	    "xorl %0, %1\n\t"	/* eax = new EFLAGS ^ old EFLAGS */
	    "pushl %0\n\t"
	    "popfl"		/* restore original EFLAGS */
	    : "=d"(edx), "=a"(eax)
	    : "1"(eax));
    return eax;
}

static __inline__ unsigned int cpuid_eax(unsigned int op)
{
    unsigned int eax, save_ebx;

    /* In PIC mode i386 reserves EBX. So we must save
       and restore it ourselves to not upset gcc. */
    __asm__(
	"movl %%ebx, %1\n\t"
	"cpuid\n\t"
	"movl %1, %%ebx"
	: "=a"(eax), "=m"(save_ebx)
	: "0"(op)
	: "cx", "dx");
    return eax;
}

static __inline__ unsigned int cpuid_edx(unsigned int op)
{
    unsigned int eax, edx, save_ebx;
 
    /* In PIC mode i386 reserves EBX. So we must save
       and restore it ourselves to not upset gcc. */
    __asm__(
	"movl %%ebx, %2\n\t"
	"cpuid\n\t"
	"movl %2, %%ebx"
	: "=a"(eax), "=d"(edx), "=m"(save_ebx)
	: "0"(op)
	: "cx");
    return edx;
}

/* The AC bit, bit #18, is a new bit introduced in the EFLAGS
 * register on the Intel486 processor to generate alignment
 * faults. This bit cannot be set on the Intel386 processor.
 */
static __inline__ int is_386(void)
{
    return ((xor_eflags(1<<18) >> 18) & 1) == 0;
}

/* Newer x86 processors have a CPUID instruction, as indicated by
 * the ID bit (#21) in EFLAGS being modifiable.
 */
static __inline__ int has_CPUID(void)
{
    return (xor_eflags(1<<21) >> 21) & 1;
}

static int cpu_has_sse2(void)
{
    unsigned int maxlev, features;
    static int has_sse2 = -1;

    if (has_sse2 >= 0)
	return has_sse2;
    has_sse2 = 0;

    if (is_386())
	return 0;
    if (!has_CPUID())
	return 0;
    maxlev = cpuid_eax(0);
    /* Intel A-step Pentium had a preliminary version of CPUID.
       It also didn't have SSE2. */
    if ((maxlev & 0xFFFFFF00) == 0x0500)
	return 0;
    /* If max level is zero then CPUID cannot report any features. */
    if (maxlev == 0)
	return 0;
    features = cpuid_edx(1);
    has_sse2 = (features & (1 << 26)) != 0;

    return has_sse2;
}
#endif /* !__x86_64__ */

static void unmask_fpe(void)
{
    unmask_x87();
    if (cpu_has_sse2())
	unmask_sse2();
}

static __inline__ int check_fpe(double f)
{
    __asm__ __volatile__("fwait" : "=m"(erl_fp_exception) : "m"(f));
    if (!erl_fp_exception)
       return 0;
    __asm__ __volatile__("fninit");
    unmask_fpe();
    return 1;
}

#elif defined(__sparc__) && defined(__linux__)

#if defined(__arch64__)
#define LDX "ldx"
#define STX "stx"
#else
#define LDX "ld"
#define STX "st"
#endif

static void unmask_fpe(void)
{
    unsigned long fsr;

    __asm__(STX " %%fsr, %0" : "=m"(fsr));
    fsr &= ~(0x1FUL << 23);	/* clear FSR[TEM] field */
    fsr |= (0x1AUL << 23);	/* enable NV, OF, DZ exceptions */
    __asm__ __volatile__(LDX " %0, %%fsr" : : "m"(fsr));
}

static __inline__ int check_fpe(double f)
{
    __asm__ __volatile__("" : "=m"(erl_fp_exception) : "em"(f));
    return erl_fp_exception;
}

#elif (defined(__powerpc__) && defined(__linux__)) || (defined(__ppc__) && defined(__DARWIN__))

#if defined(__linux__)

#include <sys/prctl.h>

static void set_fpexc_precise(void)
{
    if (prctl(PR_SET_FPEXC, PR_FP_EXC_PRECISE) < 0) {
	perror("PR_SET_FPEXC");
	exit(1);
    }
}

#elif defined(__DARWIN__)

#include <mach/mach.h>
#include <pthread.h>

/*
 * FE0 FE1	MSR bits
 *  0   0	floating-point exceptions disabled
 *  0   1	floating-point imprecise nonrecoverable
 *  1   0	floating-point imprecise recoverable
 *  1   1	floating-point precise mode
 *
 * Apparently:
 * - Darwin 5.5 (MacOS X <= 10.1) starts with FE0 == FE1 == 0,
 *   and resets FE0 and FE1 to 0 after each SIGFPE.
 * - Darwin 6.0 (MacOS X 10.2) starts with FE0 == FE1 == 1,
 *   and does not reset FE0 or FE1 after a SIGFPE.
 */
#define FE0_MASK	(1<<11)
#define FE1_MASK	(1<<8)

/* a thread cannot get or set its own MSR bits */
static void *fpu_fpe_enable(void *arg)
{
    thread_t t = *(thread_t*)arg;
    struct ppc_thread_state state;
    unsigned int state_size = PPC_THREAD_STATE_COUNT;

    if (thread_get_state(t, PPC_THREAD_STATE, (natural_t*)&state, &state_size) != KERN_SUCCESS) {
	perror("thread_get_state");
	exit(1);
    }
    if ((state.srr1 & (FE1_MASK|FE0_MASK)) != (FE1_MASK|FE0_MASK)) {
#if 0
	/* This would also have to be performed in the SIGFPE handler
	   to work around the MSR reset older Darwin releases do. */
	state.srr1 |= (FE1_MASK|FE0_MASK);
	thread_set_state(t, PPC_THREAD_STATE, (natural_t*)&state, state_size);
#else
	fprintf(stderr, "srr1 == 0x%08x, your Darwin is too old\n", state.srr1);
	exit(1);
#endif
    }
    return NULL; /* Ok, we appear to be on Darwin 6.0 or later */
}

static void set_fpexc_precise(void)
{
    thread_t self = mach_thread_self();
    pthread_t enabler;

    if (pthread_create(&enabler, NULL, fpu_fpe_enable, &self)) {
	perror("pthread_create");
    } else if (pthread_join(enabler, NULL)) {
	perror("pthread_join");
    }
}

#endif

static void set_fpscr(unsigned int fpscr)
{
    union {
	double d;
	unsigned int fpscr[2];
    } u;
    u.fpscr[0] = 0xFFF80000;
    u.fpscr[1] = fpscr;
    __asm__ __volatile__("mtfsf 255,%0" : : "f"(u.d));
}

static void unmask_fpe(void)
{
    set_fpexc_precise();
    set_fpscr(0x80|0x40|0x10);	/* VE, OE, ZE; not UE or XE */
}

static __inline__ int check_fpe(double f)
{
    __asm__ __volatile__("" : "=m"(erl_fp_exception) : "fm"(f));
    return erl_fp_exception;
}

#else

#include <ieeefp.h>

#define unmask_fpe()   fpsetmask(FP_X_INV | FP_X_OFL | FP_X_DZ)

static __inline__ int check_fpe(double f)
{
    __asm__ __volatile__("" : "=m"(erl_fp_exception) : "g"(f));
    return erl_fp_exception;
}

#endif

/*
 * Implement SIGFPE handler based on CPU/OS combination
 */

#if (defined(__linux__) && (defined(__i386__) || defined(__x86_64__) || defined(__sparc__) || defined(__powerpc__))) || (defined(__DARWIN__) && (defined(__i386__) || defined(__x86_64__) || defined(__ppc__))) || (defined(__FreeBSD__) && (defined(__i386__) || defined(__x86_64__))) || ((defined(__OpenBSD__) || defined(__NetBSD__)) && defined(__x86_64__)) || (defined(__sun__) && defined(__x86_64__))

#if defined(__linux__) && defined(__i386__)
#if !defined(X86_FXSR_MAGIC)
#define X86_FXSR_MAGIC 0x0000
#endif
#elif defined(__FreeBSD__) && defined(__i386__)
#include <sys/types.h>
#include <machine/npx.h>
#elif defined(__FreeBSD__) && defined(__x86_64__)
#include <sys/types.h>
#include <machine/fpu.h>
#elif defined(__DARWIN__)
#include <machine/signal.h>
#elif defined(__OpenBSD__) && defined(__x86_64__)
#include <sys/types.h>
#include <machine/fpu.h>
#endif
#if !(defined(__OpenBSD__) && defined(__x86_64__))
#include <ucontext.h>
#endif
#include <string.h>

static void fpe_sig_action(int sig, siginfo_t *si, void *puc)
{
    ucontext_t *uc = puc;
#if defined(__linux__)
#if defined(__x86_64__)
    mcontext_t *mc = &uc->uc_mcontext;
    fpregset_t fpstate = mc->fpregs;
    fpstate->mxcsr = 0x1F80;
    fpstate->swd &= ~0xFF;
#elif defined(__i386__)
    mcontext_t *mc = &uc->uc_mcontext;
    fpregset_t fpstate = mc->fpregs;
    if ((fpstate->status >> 16) == X86_FXSR_MAGIC)
	((struct _fpstate*)fpstate)->mxcsr = 0x1F80;
    fpstate->sw &= ~0xFF;
#elif defined(__sparc__) && defined(__arch64__)
    /* on SPARC the 3rd parameter points to a sigcontext not a ucontext */
    struct sigcontext *sc = (struct sigcontext*)puc;
    sc->sigc_regs.tpc = sc->sigc_regs.tnpc;
    sc->sigc_regs.tnpc += 4;
#elif defined(__sparc__)
    /* on SPARC the 3rd parameter points to a sigcontext not a ucontext */
    struct sigcontext *sc = (struct sigcontext*)puc;
    sc->si_regs.pc = sc->si_regs.npc;
    sc->si_regs.npc = (unsigned long)sc->si_regs.npc + 4;
#elif defined(__powerpc__)
#if defined(__powerpc64__)
    mcontext_t *mc = &uc->uc_mcontext;
    unsigned long *regs = &mc->gp_regs[0];
#else
    mcontext_t *mc = uc->uc_mcontext.uc_regs;
    unsigned long *regs = &mc->gregs[0];
#endif
    regs[PT_NIP] += 4;
    regs[PT_FPSCR] = 0x80|0x40|0x10;	/* VE, OE, ZE; not UE or XE */
#endif
#elif defined(__DARWIN__)
#if defined(DARWIN_MODERN_MCONTEXT)
#if defined(__x86_64__)
    mcontext_t mc = uc->uc_mcontext;
    struct __darwin_x86_float_state64 *fpstate = &mc->__fs;
    fpstate->__fpu_mxcsr = 0x1F80;
    *(unsigned short *)&fpstate->__fpu_fsw &= ~0xFF;
#elif defined(__i386__)
    mcontext_t mc = uc->uc_mcontext;
    struct __darwin_i386_float_state *fpstate = &mc->__fs;
    fpstate->__fpu_mxcsr = 0x1F80;
    *(unsigned short *)&fpstate->__fpu_fsw &= ~0xFF;
#elif defined(__ppc__)
    mcontext_t mc = uc->uc_mcontext;
    mc->ss.srr0 += 4;
    mc->fs.fpscr = 0x80|0x40|0x10;
#endif
#else
#if defined(__x86_64__)
    mcontext_t mc = uc->uc_mcontext;
    struct x86_float_state64_t *fpstate = &mc->fs;
    fpstate->fpu_mxcsr = 0x1F80;
    *(unsigned short *)&fpstate->fpu_fsw &= ~0xFF;
#elif defined(__i386__)
    mcontext_t mc = uc->uc_mcontext;
    x86_float_state32_t	*fpstate = &mc->fs;
    fpstate->fpu_mxcsr = 0x1F80;
    *(unsigned short *)&fpstate->fpu_fsw &= ~0xFF;
#elif defined(__ppc__)
    mcontext_t mc = uc->uc_mcontext;
    mc->ss.srr0 += 4;
    mc->fs.fpscr = 0x80|0x40|0x10;
#endif
#endif
#elif defined(__FreeBSD__) && defined(__x86_64__)
    mcontext_t *mc = &uc->uc_mcontext;
    struct savefpu *savefpu = (struct savefpu*)&mc->mc_fpstate;
    struct envxmm *envxmm = &savefpu->sv_env;
    envxmm->en_mxcsr = 0x1F80;
    envxmm->en_sw &= ~0xFF;
#elif defined(__FreeBSD__) && defined(__i386__)
    mcontext_t *mc = &uc->uc_mcontext;
    union savefpu *savefpu = (union savefpu*)&mc->mc_fpstate;
    if (mc->mc_fpformat == _MC_FPFMT_XMM) {
	struct envxmm *envxmm = &savefpu->sv_xmm.sv_env;
	envxmm->en_mxcsr = 0x1F80;
	envxmm->en_sw &= ~0xFF;
    } else {
	struct env87 *env87 = &savefpu->sv_87.sv_env;
	env87->en_sw &= ~0xFF;
    }
#elif defined(__OpenBSD__) && defined(__x86_64__)
    struct fxsave64 *fxsave = uc->sc_fpstate;
    fxsave->fx_mxcsr = 0x1F80;
    fxsave->fx_fsw &= ~0xFF;
#elif defined(__NetBSD__) && defined(__x86_64__)
    mcontext_t *mc = &uc->uc_mcontext;
    struct fxsave64 *fxsave = (struct fxsave64 *)&mc->__fpregs;
    fxsave->fx_mxcsr = 0x1F80;
    fxsave->fx_fsw &= ~0xFF;
#elif defined(__sun__) && defined(__x86_64__)
    mcontext_t *mc = &uc->uc_mcontext;
    struct fpchip_state *fpstate = &mc->fpregs.fp_reg_set.fpchip_state;
    fpstate->mxcsr = 0x1F80;
    fpstate->sw &= ~0xFF;
#endif
    new_fp_exception();
}

static void catch_sigfpe(void)
{
    struct sigaction act;

    memset(&act, 0, sizeof act);
    act.sa_sigaction = fpe_sig_action;
    act.sa_flags = SA_SIGINFO;
    sigaction(SIGFPE, &act, NULL);
}

#else

static void fpe_sig_handler(int sig)
{
    new_fp_exception();
}

static void catch_sigfpe(void)
{
    signal(SIGFPE, fpe_sig_handler);
}

#endif

/*
 * Generic test code
 */

static void do_init(void)
{
    catch_sigfpe();
    unmask_fpe();
}

double a = 3.23e133;
double b = 3.57e257;
double res;

void do_fmul(void)
{
    res = a * b;
}

int do_check(void)
{
    if (check_fpe(res)) {
       fprintf(stderr, "res = %g, FPE worked\n", res);
       return 0;
    } else {
       fprintf(stderr, "res = %g, FPE failed\n", res);
       return 1;
    }
}

int main(int argc, const char **argv)
{
    if (argc == 3) {
       a = atof(argv[1]);
       b = atof(argv[2]);
    }
    do_init();
    do_fmul();
    return do_check();
}
],
erl_ok=yes,
erl_ok=no,
[
case X$erl_xcomp_reliable_fpe in
    X) erl_ok=cross;;
    Xyes|Xno) erl_ok=$erl_xcomp_reliable_fpe;;
    *) AC_MSG_ERROR([Bad erl_xcomp_reliable_fpe value: $erl_xcomp_reliable_fpe]);;
esac
])

    if test $erl_ok = yes; then
	FPE=reliable
        AC_MSG_RESULT(reliable)
    else
	FPE=unreliable
	AC_MSG_RESULT([unreliable; testing in software instead])
	AC_DEFINE(NO_FPE_SIGNALS,[],[Define if floating points exceptions are non-existing/not reliable])
	if test $erl_ok = cross; then
	    AC_MSG_WARN([result unreliable guessed because of cross compilation])
	fi
    fi
fi	

	
	 
		



dnl
dnl Some operating systems allow you to redefine FD_SETSIZE to be able
dnl to select on more than the default number of file descriptors.
dnl We first discovered this in BSD/OS where the default is ridiculously
dnl low (256). But since we use a lot of file descriptors we found the
dnl need to go over the limit in other os's as well. Since FD_SETSIZE 
dnl must be defined before pulling in sys/types.h the actual number
dnl of file descriptors is set in acconfig.h and will thus be in config.h
dnl which *always* should be included first.
dnl

AC_MSG_CHECKING([whether to redefine FD_SETSIZE])
case $host_os in
  bsdi*)
	AC_DEFINE(REDEFINE_FD_SETSIZE,[],[Define if you wish to redefine FD_SETSIZE to be able to select on more fd])
	AC_MSG_RESULT(yes)
	;;
  *)
	AC_MSG_RESULT(no)
	;;
esac



dnl ----------------------------------------------------------------------
dnl Tests related to configurable options given on command line
dnl (using the --disable, --enable and --with switches).
dnl ----------------------------------------------------------------------

#
# Check if we should enable HiPE.
#

HIPE_ENABLED=
HIPE_HELPERS=

dnl if not disabled, autoenable HiPE on known supported platforms
dnl done up where floating point is checked, need to descide there already...

if test X${enable_hipe} = Xyes; then
  if test X$ac_cv_sizeof_void_p != X4 -a X$ARCH != Xamd64 -a X$ARCH != Xppc64; then
	AC_MSG_WARN([HiPE is not supported in 64-bit builds])
  else
     HIPE_ENABLED=yes
     AC_DEFINE(HIPE,[1],[Define to enable HiPE])
     HIPE_HELPERS="xmerl syntax_tools edoc"
     ENABLE_ALLOC_TYPE_VARS="$ENABLE_ALLOC_TYPE_VARS hipe"
  fi
fi
AC_SUBST(HIPE_HELPERS)
AC_SUBST(HIPE_ENABLED)

#
# Check if Erlang libraries should be compiled to native code.
#
NATIVE_LIBS_ENABLED=
if test X${enable_native_libs} = Xyes -a X${HIPE_ENABLED} = Xyes; then
  NATIVE_LIBS_ENABLED=yes
fi
AC_SUBST(NATIVE_LIBS_ENABLED)

#
# Check if HiPE should use a standard installation of perfctr.
#
AC_SUBST(USE_PERFCTR)
if test "x$HIPE_ENABLED" = "xyes" ; then
  if test "x$with_perfctr" = "x" ; then
      AC_CHECK_LIB(perfctr, vperfctr_info, [USE_PERFCTR=1
	  AC_DEFINE(USE_PERFCTR,[1],[Define to enable hrvtime() on Linux systems with perfctr extension])])
  elif test "x$with_perfctr" != "xno" ; then
      USE_PERFCTR=1
  fi
fi

#
# Check for working poll().
#
AC_MSG_CHECKING([for working poll()])
if test "x$ac_cv_header_poll_h" != "xyes" -o "x$ac_cv_func_poll" != "xyes"; then

poll_works=no

else

AC_TRY_RUN([
#include <poll.h>
main()
{
#ifdef _POLL_EMUL_H_
  exit(1); /* Implemented using select() -- fail */
#else
  struct pollfd fds[1];
  int fd;
  fd = open("/dev/null", 1);
  fds[0].fd = fd;
  fds[0].events = POLLIN;
  fds[0].revents = 0;
  if (poll(fds, 1, 0) < 0 || (fds[0].revents & POLLNVAL) != 0) {
    exit(1);  /* Does not work for devices -- fail */
  }
  exit(0);
#endif
}
],
poll_works=yes,
poll_works=no,
[
case X$erl_xcomp_poll in
    X) poll_works=cross;;
    Xyes|Xno) poll_works=$erl_xcomp_poll;;
    *) AC_MSG_ERROR([Bad erl_xcomp_poll value: $erl_xcomp_poll]);;
esac
])

fi

case $poll_works-$host_os in
    no-*|cross-darwin*)
	#
	# The USE_SELECT define is used by the ssl application (should not
	# be used by erts).
	#
	AC_DEFINE(USE_SELECT, 1, [Define if select() should be used instead of poll()])
	if test $poll_works = cross; then
	    AC_MSG_RESULT(cross)
	    AC_MSG_WARN([result no guessed based on OS ($host_os) because of cross compilation])
	else
	    AC_MSG_RESULT([no; non-existing, broken, or based on select()])
        fi
	poll_works=no;;
    yes-*|cross-*)
	AC_DEFINE(ERTS_USE_POLL, 1, [Define if poll() should be used instead of select()])
	if test $poll_works = cross; then
	    AC_MSG_RESULT(cross)
	    AC_MSG_WARN([result yes guessed based on OS ($host_os) because of cross compilation])
	else
	    AC_MSG_RESULT(yes)
        fi
	poll_works=yes;;
esac

#
# If kqueue() found, check that it can be selected or polled on...
#
if test $have_kernel_poll = kqueue; then
	if test $poll_works = yes; then
		kqueue_with=poll
	else
		kqueue_with=select
	fi
	AC_MSG_CHECKING([whether kqueue() fd can be ${kqueue_with}()ed on])
	AC_TRY_RUN([
#include <stdlib.h>
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#ifdef ERTS_USE_POLL
#include <poll.h>
#else
#include <unistd.h>
#endif
int main(void) {
    int kq = kqueue();
    if (kq < 0) return 2;
    {
#ifdef ERTS_USE_POLL
	struct pollfd pfds = {kq, POLLIN, 0};
	if (poll(&pfds, 1, 0) < 0) return 1;
#else
	struct timeval tv = {0, 0};
	fd_set set; FD_ZERO(&set); FD_SET(kq, &set);
	if (select(kq+1, &set, NULL, NULL, &tv) < 0) return 1;
#endif
    }
    return 0;
}
	],
	ok_kqueue=yes,
	ok_kqueue=no,
	[
	case X$erl_xcomp_kqueue in
	    X) ok_kqueue=cross;;
	    Xyes|Xno) ok_kqueue=$erl_xcomp_kqueue;;
	    *) AC_MSG_ERROR([Bad erl_xcomp_kqueue value: $erl_xcomp_kqueue]);;
	esac
	])
	AC_MSG_RESULT($ok_kqueue);
	case $ok_kqueue in
	    yes)
		;;
	    cross)
		have_kernel_poll=no
		AC_MSG_WARN([result no guessed because of cross compilation]);;
	    *)
		have_kernel_poll=no;;
	esac
fi

#
# If epoll() found, check that it is level triggered.
#
if test $have_kernel_poll = epoll; then
	AC_MSG_CHECKING([whether epoll is level triggered])
	AC_TRY_COMPILE([#include <sys/epoll.h>],[
			#ifdef EPOLLET
			/* Edge triggered option exist, assume level triggered
			   is default */
			;
			#else
			/* No edge triggered option exist; assume edge
			   triggered only */
			#error No EPOLLET
			#endif
			],
			level_triggered_epoll=yes,
			[level_triggered_epoll=no
			 have_kernel_poll=no])
	AC_MSG_RESULT([$level_triggered_epoll])
fi
#
# Check if we should enable kernel poll support
#
AC_MSG_CHECKING(whether kernel poll support should be enabled)
ERTS_ENABLE_KERNEL_POLL=no
case $enable_kernel_poll-$have_kernel_poll in
    no-*)
	AC_MSG_RESULT(no; disabled by user);;
    yes-no)
	AC_MSG_ERROR(no; kernel poll support requested but not found);;
    *-no)
	AC_MSG_RESULT(no);;
    *)
	case $have_kernel_poll in
	    epoll)
		AC_DEFINE(HAVE_SYS_EPOLL_H, 1, [Define if you have the <sys/epoll.h> header file.]);;
	    /dev/poll)
		AC_DEFINE(HAVE_SYS_DEVPOLL_H, 1, [Define if you have <sys/devpoll.h> header file.]);;
	    kqueue)
		AC_DEFINE(HAVE_SYS_EVENT_H, 1, [Define if you have <sys/event.h> header file.]);;
	    *)
		AC_MSG_ERROR(configure.in need to be updated);;
	esac
	ERTS_ENABLE_KERNEL_POLL=yes
	AC_DEFINE(ERTS_ENABLE_KERNEL_POLL, 1, [Define if you have kernel poll and want to use it])
	AC_MSG_RESULT([yes; $have_kernel_poll]);;
esac
AC_SUBST(ERTS_ENABLE_KERNEL_POLL)

AC_MSG_CHECKING([whether putenv() stores a copy of the key-value pair])
AC_TRY_RUN([
#include <stdlib.h>
int main(void) {
    int i;
    char *env;
    char buf[10];
    for (i = 0; i < 7; i++)
	buf[i] = 'X';
    buf[i] = '\0';
    buf[3] = '=';
    if (putenv(buf) != 0)
	return 1;
    for (i = 4; i < 7; i++)
	buf[i] = 'Y';
    env = getenv("XXX");
    if (!env)
	return 2;
    for (i = 0; i < 3; i++)
	if (env[i] != 'X')
	    return 3;
    for (i = 0; i < 3; i++)
	buf[i] = 'Y';
    env = getenv("XXX");
    if (!env)
	return 4;
    for (i = 0; i < 3; i++)
	if (env[i] != 'X')
	    return 5;
    return 0;
}
],
copying_putenv=yes,
copying_putenv=no,
[
case X$erl_xcomp_putenv_copy in
    X) copying_putenv=cross;;
    Xyes|Xno) copying_putenv=$erl_xcomp_putenv_copy;;
    *) AC_MSG_ERROR([Bad erl_xcomp_putenv_copy value: $erl_xcomp_putenv_copy]);;
esac
])

AC_MSG_RESULT($copying_putenv)
case $copying_putenv in
    yes)
	AC_DEFINE(HAVE_COPYING_PUTENV,[1],\
[Define if you have a putenv() that stores a copy of the key-value pair]);;
    cross)
	AC_MSG_WARN([result no guessed because of cross compilation]);;
    *) ;;
esac

dnl ----------------------------------------------------------------------
dnl Stuff that should be moved into their respective application
dnl ----------------------------------------------------------------------

dnl crypto
#--------------------------------------------------------------------
# Dynamic Erlang Drivers
#
# Linking to produce dynamic Erlang drivers to be loaded by Erlang's
# Dynamic Driver Loader and Linker (DDLL). Below the prefix DED is an
# abbreviation for `Dynamic Erlang Driver'.
#
# For DED we need something quite sloppy, which allows undefined references 
# (notably driver functions) in the resulting shared library. 
# Example of Makefile rule (and settings of macros):
#
# LIBS = @LIBS@
# LD = @DED_LD@
# LDFLAGS = @DED_LDFLAGS@
# soname = @ldsoname@
#
# my_drv.so:   my_drv.o my_utils.o
#              $(LD) $(LDFLAGS) $(soname) $@ -o $@ $^ -lc $(LIBS)
#
#--------------------------------------------------------------------

DED_SYS_INCLUDE="-I${ERL_TOP}/erts/emulator/beam -I${ERL_TOP}/erts/include -I${ERL_TOP}/erts/include/$host -I${ERL_TOP}/erts/include/internal -I${ERL_TOP}/erts/include/internal/$host -I${ERL_TOP}/erts/emulator/sys/$ERLANG_OSTYPE"

if test "X$ETHR_DEFS" = "X"; then
    DED_THR_DEFS="-D_THREAD_SAFE -D_REENTRANT"
else
    DED_THR_DEFS="$ETHR_DEFS"
fi
DED_EMU_THR_DEFS=$EMU_THR_DEFS
DED_CFLAGS="$CFLAGS $CPPFLAGS"
if test "x$GCC" = xyes; then
    DED_STATIC_CFLAGS="$DED_CFLAGS"
    DED_CFLAGS="$DED_CFLAGS -fPIC"
fi

DED_EXT=so
case $host_os in
    win32) DED_EXT=dll;;
    darwin*)
	DED_CFLAGS="$DED_CFLAGS -fno-common"
	DED_STATIC_CFLAGS="$DED_STATIC_CFLAGS -fno-common";;
    *)
	;;
esac

DED_STATIC_CFLAGS="$DED_STATIC_CFLAGS -DSTATIC_ERLANG_NIF -DSTATIC_ERLANG_DRIVER"

# If DED_LD is set in environment, we expect all DED_LD* variables
# to be specified (cross compiling)
if test "x$DED_LD" = "x"; then

DED_LD_FLAG_RUNTIME_LIBRARY_PATH="-R"
case $host_os in
	win32)
		DED_LD="ld.sh"
		DED_LDFLAGS="-dll"
		DED_LD_FLAG_RUNTIME_LIBRARY_PATH=
	;;
	solaris2*|sysv4*)
		DED_LDFLAGS="-G"
		if test X${enable_m64_build} = Xyes; then
			DED_LDFLAGS="-64 $DED_LDFLAGS"
		fi
	;;
	aix4*)
		DED_LDFLAGS="-G -bnoentry -bexpall"
	;;
	freebsd2*)
		# Non-ELF GNU linker
		DED_LDFLAGS="-Bshareable"
	;;
	darwin*)
		# Mach-O linker: a shared lib and a loadable
		# object file is not the same thing.
		DED_LDFLAGS="-bundle -flat_namespace -undefined suppress"
		case $ARCH in
			amd64)
				DED_LDFLAGS="-m64 $DED_LDFLAGS"
				;;
			*)
				if test X${enable_darwin_universal} != Xyes; then
					DED_LDFLAGS="-m32 $DED_LDFLAGS"
				fi
				;;
		esac
		if test X${enable_darwin_universal} = Xyes; then
		   	DED_LDFLAGS="-arch ppc -arch i386 $DED_LDFLAGS"
		fi	
		DED_LD="$CC"
		DED_LD_FLAG_RUNTIME_LIBRARY_PATH="$CFLAG_RUNTIME_LIBRARY_PATH"
	;;
	linux*)
		DED_LD="$CC"
		DED_LD_FLAG_RUNTIME_LIBRARY_PATH="$CFLAG_RUNTIME_LIBRARY_PATH"
		DED_LDFLAGS="-shared -Wl,-Bsymbolic"
		if test X${enable_m64_build} = Xyes; then
			DED_LDFLAGS="-m64 $DED_LDFLAGS"
		fi;
		if test X${enable_m32_build} = Xyes; then
			DED_LDFLAGS="-m32 $DED_LDFLAGS"
		fi
	;;	
	freebsd*)
		DED_LD="$CC"
		DED_LD_FLAG_RUNTIME_LIBRARY_PATH="$CFLAG_RUNTIME_LIBRARY_PATH"
		DED_LDFLAGS="-shared"
		if test X${enable_m64_build} = Xyes; then
			DED_LDFLAGS="-m64 $DED_LDFLAGS"
		fi;
		if test X${enable_m32_build} = Xyes; then
			DED_LDFLAGS="-m32 $DED_LDFLAGS"
		fi
	;;	
	openbsd*)
		DED_LD="$CC"
		DED_LD_FLAG_RUNTIME_LIBRARY_PATH="$CFLAG_RUNTIME_LIBRARY_PATH"
		DED_LDFLAGS="-shared"
	;;
	osf*)
		# NOTE! Whitespace after -rpath is important.
		DED_LD_FLAG_RUNTIME_LIBRARY_PATH="-rpath "
		DED_LDFLAGS="-shared -expect_unresolved '*'"
	;;
	*)
		# assume GNU linker and ELF
		DED_LDFLAGS="-shared"
		# GNU linker has no option for 64bit build, should not propagate -m64
	;;
esac

if test "$DED_LD" = "" && test "$USER_LD" != ""; then
    DED_LD="$USER_LD"
    DED_LDFLAGS="$USER_LDFLAGS $DED_LDFLAGS"
fi

fi # "x$DED_LD" = "x"

AC_CHECK_TOOL(DED_LD, ld, false)
test "$DED_LD" != "false" || AC_MSG_ERROR([No linker found])

AC_MSG_CHECKING(for compiler flags for loadable drivers)
AC_MSG_RESULT([$DED_CFLAGS])
AC_MSG_CHECKING(for linker for loadable drivers)
AC_MSG_RESULT([$DED_LD])
AC_MSG_CHECKING(for linker flags for loadable drivers)
AC_MSG_RESULT([$DED_LDFLAGS])
AC_MSG_CHECKING(for 'runtime library path' linker flag)
if test "x$DED_LD_FLAG_RUNTIME_LIBRARY_PATH" != "x"; then
	AC_MSG_RESULT([$DED_LD_FLAG_RUNTIME_LIBRARY_PATH])
else
	AC_MSG_RESULT([not found])
fi

AC_SUBST(DED_EXT)
AC_SUBST(DED_SYS_INCLUDE)
AC_SUBST(DED_CFLAGS)
AC_SUBST(DED_STATIC_CFLAGS)
AC_SUBST(DED_LD)
AC_SUBST(DED_LDFLAGS)
AC_SUBST(DED_LD_FLAG_RUNTIME_LIBRARY_PATH)
AC_SUBST(DED_THR_DEFS)
AC_SUBST(DED_EMU_THR_DEFS)
AC_SUBST(STATIC_CFLAGS)

dnl
dnl We should look for a compiler that handles jump tables, for beam_emu 
dnl to be optimized
dnl

LM_FIND_EMU_CC

dnl
dnl DTrace
dnl
case $DYNAMIC_TRACE_FRAMEWORK in
     dtrace|systemtap)
        AC_CHECK_TOOL(DTRACE, dtrace, none)
        test "$DTRACE" = "none" && AC_MSG_ERROR([No dtrace utility found.]);
	enable_dtrace_test=yes;;
     *) enable_dtrace_test=no;;
esac        
		     
AC_SUBST(DTRACE)

AC_SUBST(DTRACE_CPP)
AC_SUBST(DTRACE_ENABLED)
AC_SUBST(DTRACE_ENABLED_2STEP)
DTRACE_CPP=-C
DTRACE_ENABLED=
DTRACE_ENABLED_2STEP=
DTRACE_2STEP_TEST=./dtrace-test.o
DTRACE_BITS_FLAG=
case $OPSYS in
    freebsd)
	if test "$BITS64" = "yes" ; then
		DTRACE_BITS_FLAG=-64
	else
		DTRACE_BITS_FLAG=-32
	fi
    ;;
    *)
	: # Nothing to do
    ;;
esac
if test "$enable_dtrace_test" = "yes" ; then
        if test "$DTRACE" = "dtrace" ; then
                AC_CHECK_HEADERS(sys/sdt.h)
		AC_MSG_CHECKING([for 1-stage DTrace precompilation])
                # The OS X version of dtrace prints a spurious line here.
                if ! dtrace -h $DTRACE_CPP -Iemulator/beam -o ./foo-dtrace.h -s emulator/beam/erlang_dtrace.d; then
                        AC_MSG_ERROR([Could not precompile erlang_dtrace.d: dtrace -h failed])
                fi
		AC_MSG_RESULT([yes])

		AC_MSG_CHECKING([for 2-stage DTrace precompilation])
                AC_TRY_COMPILE([ #include "foo-dtrace.h" ],
                    [ERLANG_DIST_PORT_BUSY_ENABLED();],
		    [$RM -f $DTRACE_2STEP_TEST
		     dtrace -G $DTRACE_CPP $DTRACE_BITS_FLAG -Iemulator/beam -o $DTRACE_2STEP_TEST -s emulator/beam/erlang_dtrace.d conftest.$OBJEXT 2>&AS_MESSAGE_LOG_FD
                     if test -f $DTRACE_2STEP_TEST; then
			rm $DTRACE_2STEP_TEST
                        DTRACE_ENABLED_2STEP=yes
		     fi],
                    [])
		AS_IF([test "x$DTRACE_ENABLED_2STEP" = "xyes"],
		      [AC_MSG_RESULT([yes])],
                      [AC_MSG_RESULT([no])])

                DTRACE_ENABLED=yes
                case $OPSYS in
                    linux)
                        : # No extra libs to add to LIBS
                    ;;
                    freebsd)
                        LIBS="$LIBS -lelf"
                    ;;
                    *)
                        LIBS="$LIBS -ldtrace"
                    ;;
                esac
        else
                AC_MSG_ERROR([Dtrace preprocessing test failed.])
        fi
fi

dnl
dnl SSL, SSH and CRYPTO need the OpenSSL libraries
dnl
dnl Check flags --with-ssl, --without-ssl --with-ssl=PATH.
dnl If no option is given or --with-ssl is set without a path then we
dnl search for OpenSSL libraries and header files in the standard locations. 
dnl If set to --without-ssl we disable the use of SSL, SSH and CRYPTO.
dnl If set to --with-ssl=PATH we use that path as the prefix, i.e. we
dnl use "PATH/include" and "PATH/lib".

AC_SUBST(SSL_INCLUDE)
AC_SUBST(SSL_ROOT)
AC_SUBST(SSL_LIBDIR)
AC_SUBST(SSL_CRYPTO_LIBNAME)
AC_SUBST(SSL_SSL_LIBNAME)
AC_SUBST(SSL_CC_RUNTIME_LIBRARY_PATH)
AC_SUBST(SSL_LD_RUNTIME_LIBRARY_PATH)
AC_SUBST(SSL_DED_LD_RUNTIME_LIBRARY_PATH)
AC_SUBST(SSL_DYNAMIC_ONLY)
AC_SUBST(SSL_LINK_WITH_KERBEROS)
AC_SUBST(STATIC_KERBEROS_LIBS)
AC_SUBST(SSL_LINK_WITH_ZLIB)
AC_SUBST(STATIC_ZLIB_LIBS)

std_ssl_locations="/usr/local /usr/sfw /usr /opt/local /usr/pkg /usr/local/openssl /usr/lib/openssl /usr/openssl /usr/local/ssl /usr/lib/ssl /usr/ssl /"

AC_ARG_WITH(ssl-zlib,
AS_HELP_STRING([--with-ssl-zlib=PATH],
               [specify location of ZLib to be used by OpenSSL])
AS_HELP_STRING([--with-ssl-zlib],
               [link SSL with  Zlib (default if found)])
AS_HELP_STRING([--without-ssl-zlib],
               [don't link SSL with ZLib]))


if  test "x$with_ssl_zlib" = "xno"; then
	SSL_LINK_WITH_ZLIB=no
	STATIC_ZLIB_LIBS=
elif test "x$with_ssl_zlib" = "xyes" || test "x$with_ssl_zlib" = "x"; then
	if test $erl_xcomp_without_sysroot = yes; then
		AC_MSG_WARN([Cannot search for zlib; missing cross system root (erl_xcomp_sysroot).])
		SSL_LINK_WITH_ZLIB=no	
		STATIC_ZLIB_LIBS=	
	elif  test "x$MIXED_CYGWIN" = "xyes" -o "x$MIXED_MSYS" = "xyes"; then
		SSL_LINK_WITH_ZLIB=no	
		STATIC_ZLIB_LIBS=	
	else
		SSL_LINK_WITH_ZLIB=no
		STATIC_ZLIB_LIBS=
		AC_MSG_CHECKING(for static ZLib to be used by SSL in standard locations) 
		for rdir in $std_ssl_locations; do
			dir="$erl_xcomp_sysroot$rdir"
			if test "x$ac_cv_sizeof_void_p" = "x8"; then
				if test -f "$dir/lib64/libz.a"; then
					SSL_LINK_WITH_ZLIB=yes
					STATIC_ZLIB_LIBS="$dir/lib64/libz.a"
					break
				elif test -f "$dir/lib/64/libz.a"; then
					SSL_LINK_WITH_ZLIB=yes
					STATIC_ZLIB_LIBS="$dir/lib/64/libz.a"
					break
				fi
			fi
			if test -f "$dir/lib/libz.a"; then
					SSL_LINK_WITH_ZLIB=yes
				STATIC_ZLIB_LIBS="$dir/lib/libz.a"
				break
			fi
		done
		if test "x$SSL_LINK_WITH_ZLIB" = "xno"; then
		       	AC_MSG_RESULT([no])
		else
			AC_MSG_RESULT([$STATIC_ZLIB_LIBS])
		fi
	fi				
else
	SSL_LINK_WITH_ZLIB=no
	STATIC_ZLIB_LIBS=
	if test -f "$with_ssl_zlib/libz.a"; then
		SSL_LINK_WITH_ZLIB=yes
		STATIC_ZLIB_LIBS=$with_ssl_zlib/libz.a
	elif test -f "$with_ssl_zlib/lib/libz.a"; then
		SSL_LINK_WITH_ZLIB=yes
		STATIC_ZLIB_LIBS=$with_ssl_zlib/lib/libz.a
	fi
	if test "x$ac_cv_sizeof_void_p" = "x8"; then
		if test -f "$with_ssl_zlib/lib64/libz.a"; then
			SSL_LINK_WITH_ZLIB=yes
			STATIC_ZLIB_LIBS=$with_ssl_zlib/lib64/libz.a
		elif test -f "$with_ssl_zlib/lib/64/libz.a"; then
			SSL_LINK_WITH_ZLIB=yes
			STATIC_ZLIB_LIBS=$with_ssl_zlib/lib/64/libz.a
		fi
	fi
	if test "x$SSL_LINK_WITH_ZLIB" = "xno"; then
	       	AC_MSG_ERROR(Invalid path to option --with-ssl-zlib=PATH)
	fi
fi
		
			
AC_ARG_WITH(ssl,
AS_HELP_STRING([--with-ssl=PATH], [specify location of OpenSSL include and lib])
AS_HELP_STRING([--with-ssl], [use SSL (default)])
AS_HELP_STRING([--without-ssl], [don't use SSL]))

AC_ARG_ENABLE(dynamic-ssl-lib,
AS_HELP_STRING([--disable-dynamic-ssl-lib],
               [disable using dynamic openssl libraries]),
[ case "$enableval" in
    no) enable_dynamic_ssl=no ;;
    *)  enable_dynamic_ssl=yes ;;
  esac ], enable_dynamic_ssl=yes)

#----------------------------------------------------------------------
# We actually might do the SSL tests twice due to late discovery of 
# kerberos problems with static linking, in case we redo it all trying
# dynamic SSL libraries instead.
#----------------------------------------------------------------------

ssl_done=no

while test "x$ssl_done" != "xyes"; do

ssl_done=yes # Default only one run

# Remove all SKIP files from previous runs
for a in ssl crypto ssh; do
  /bin/rm -f $ERL_TOP/lib/$a/SKIP
done

SSL_DYNAMIC_ONLY=$enable_dynamic_ssl
SSL_STATIC_ONLY=no

case "$erl_xcomp_without_sysroot-$with_ssl" in
  yes-* | no-no)
    SSL_APP=
    CRYPTO_APP=
    SSH_APP=
    if test "$with_ssl" = "no"; then
	skip="User gave --without-ssl option"
    else
	skip="Cannot search for ssl; missing cross system root (erl_xcomp_sysroot)."
    fi
    for a in ssl crypto ssh; do
        echo "$skip" > $ERL_TOP/lib/$a/SKIP
    done
    ;;
  no-yes | no- )
    # On windows, we could try to find the installation
    # of Shining Light OpenSSL, which can be found by poking in
    # the uninstall section in the registry, it's worth a try...
    extra_dir=""
    if  test "x$MIXED_CYGWIN" = "xyes"; then
    	AC_CHECK_PROG(REGTOOL, regtool, regtool, false)
	if test "$ac_cv_prog_REGTOOL" != false; then
		wrp="/machine/software/microsoft/windows/currentversion/"
	   	if test "x$ARCH" = "xamd64"; then
		   urp="uninstall/openssl (64-bit)_is1/inno setup: app path"
		   regtool_subsystem=-w
		else
		   urp="uninstall/openssl (32-bit)_is1/inno setup: app path"
		   regtool_subsystem=-W
		fi	
		rp="$wrp$urp"
		if regtool -q $regtool_subsystem get "$rp" > /dev/null; then
		   true
		else
		   # Fallback to unspecified wordlength
		   urp="uninstall/openssl_is1/inno setup: app path"
		   rp="$wrp$urp"
		fi	
		if regtool -q $regtool_subsystem get "$rp" > /dev/null; then
			ssl_install_dir=`regtool -q $regtool_subsystem get "$rp"`
			# Try hard to get rid of spaces...
			if cygpath -d "$ssl_install_dir" > /dev/null 2>&1; then
				ssl_install_dir=`cygpath -d "$ssl_install_dir"`
			fi
			extra_dir=`cygpath $ssl_install_dir`
		fi
	fi
    elif test "x$MIXED_MSYS" = "xyes"; then
    	AC_CHECK_PROG(REGTOOL, reg_query.sh, reg_query.sh, false)
	if test "$ac_cv_prog_REGTOOL" != false; then
	   	if test "x$ARCH" = "xamd64"; then
		   rp="HKLM/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall/OpenSSL (64-bit)_is1"
		else
		   rp="HKLM/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall/OpenSSL_is1"
		fi	
		key="Inno Setup: App Path"
		if "$ac_cv_prog_REGTOOL" "$rp" "$key" > /dev/null; then
			ssl_install_dir=`"$ac_cv_prog_REGTOOL" "$rp" "$key"`
			extra_dir=`win2msys_path.sh "$ssl_install_dir"`
		fi
	fi
    fi
    # We search for OpenSSL in the common OS standard locations.
    SSL_APP=ssl
    CRYPTO_APP=crypto
    SSH_APP=ssh

    SSL_CRYPTO_LIBNAME=crypto
    SSL_SSL_LIBNAME=ssl
    
    if  test "x$MIXED_CYGWIN" = "xyes" -o "x$MIXED_MSYS" = "xyes"; then
    	if test "x$ARCH" = "xamd64"; then
	  std_win_ssl_locations="/cygdrive/c/OpenSSL-Win64 /c/OpenSSL-Win64 /opt/local64/pgm/OpenSSL"
	else
	  std_win_ssl_locations="/cygdrive/c/OpenSSL-Win32 /c/OpenSSL-Win32 /cygdrive/c/OpenSSL /c/OpenSSL /opt/local/pgm/OpenSSL"
	fi
    else
        std_win_ssl_locations=""
    fi


    AC_MSG_CHECKING(for OpenSSL >= 0.9.7 in standard locations)
    for rdir in $extra_dir $std_win_ssl_locations $std_ssl_locations; do
	dir="$erl_xcomp_sysroot$rdir"
	if test -f "$erl_xcomp_isysroot$rdir/include/openssl/opensslv.h"; then
		is_real_ssl=yes
		SSL_ROOT="$dir"
		if test "x$MIXED_CYGWIN" = "xyes" -o "x$MIXED_MSYS" = "xyes"; then
			if test -f "$dir/lib/VC/libeay32.lib"; then
				SSL_RUNTIME_LIBDIR="$rdir/lib/VC"
				SSL_LIBDIR="$dir/lib/VC"
				SSL_CRYPTO_LIBNAME=libeay32
				SSL_SSL_LIBNAME=ssleay32
			elif test -f "$dir/lib/VC/openssl.lib"; then 
				SSL_RUNTIME_LIBDIR="$rdir/lib/VC"
				SSL_LIBDIR="$dir/lib/VC"
			elif test -f $dir/lib/VC/libeay32MD.lib; then
		            SSL_CRYPTO_LIBNAME=libeay32MD
		            SSL_SSL_LIBNAME=ssleay32MD
			    if test "x$enable_dynamic_ssl" = "xno" && \
	                       test -f  $dir/lib/VC/static/libeay32MD.lib; then
				  SSL_RUNTIME_LIBDIR="$rdir/lib/VC/static"
				  SSL_LIBDIR="$dir/lib/VC/static"
		            else
			          SSL_RUNTIME_LIBDIR="$rdir/lib/VC"
				  SSL_LIBDIR="$dir/lib/VC"
                            fi 
			elif test -f "$dir/lib/libeay32.lib"; then
				SSL_RUNTIME_LIBDIR="$rdir/lib"
				SSL_LIBDIR="$dir/lib"
				SSL_CRYPTO_LIBNAME=libeay32
				SSL_SSL_LIBNAME=ssleay32
			elif test -f "$dir/lib/openssl.lib"; then
				SSL_RUNTIME_LIBDIR="$rdir/lib"
				SSL_LIBDIR="$dir/lib"
			else
				is_real_ssl=no
			fi
		elif test -f "$dir/lib/powerpc/libsslcrypto.a"; then
			SSL_CRYPTO_LIBNAME=sslcrypto
			SSL_LIBDIR="$dir/lib/powerpc/"
			SSL_RUNTIME_LIBDIR="$rdir/lib/powerpc/"
		else
			if test "x$ac_cv_sizeof_void_p" = "x8"; then
				if test -f "$dir/lib64/libcrypto.a"; then
					SSL_RUNTIME_LIBDIR="$rdir/lib64"
					SSL_LIBDIR="$dir/lib64"
				elif test -f "$dir/lib/64/libcrypto.a"; then
					SSL_RUNTIME_LIBDIR="$rdir/lib/64"
					SSL_LIBDIR="$dir/lib/64"
				elif test -f "$dir/lib64/libcrypto.so"; then
					SSL_RUNTIME_LIBDIR="$rdir/lib64"
					SSL_LIBDIR="$dir/lib64"
				elif test -f "$dir/lib/64/libcrypto.so"; then
					SSL_RUNTIME_LIBDIR="$rdir/lib/64"
					SSL_LIBDIR="$dir/lib/64"
				else
					SSL_RUNTIME_LIBDIR="$rdir/lib"
					SSL_LIBDIR="$dir/lib"
				fi
			else	 
				SSL_RUNTIME_LIBDIR="$rdir/lib"
				SSL_LIBDIR="$dir/lib"
			fi
		fi
		if test '!' -f "$SSL_LIBDIR/lib${SSL_CRYPTO_LIBNAME}.a"; then
			SSL_DYNAMIC_ONLY=yes
		elif test '!' -f "$SSL_LIBDIR/lib${SSL_CRYPTO_LIBNAME}.so" -a '!' -f "$SSL_LIBDIR/lib${SSL_CRYPTO_LIBNAME}.dylib"; then
			SSL_STATIC_ONLY=yes
		fi
		SSL_BINDIR="$rdir/bin"
		if test "x$is_real_ssl" = "xyes" ; then
			SSL_INCLUDE="-I$dir/include"
			old_CPPFLAGS=$CPPFLAGS
			CPPFLAGS=$SSL_INCLUDE
			AC_EGREP_CPP(yes,[
#include <openssl/opensslv.h>
#if OPENSSL_VERSION_NUMBER >= 0x0090700fL
  yes
#endif
			],[
			ssl_found=yes
			],[
			SSL_APP=
			ssl_found=no
         		])
         		CPPFLAGS=$old_CPPFLAGS
			if test "x$ssl_found" = "xyes"; then
			   	if test "x$MIXED_CYGWIN" = "xyes" -o "x$MIXED_MSYS" = "xyes"; then
				   	ssl_linkable=yes
				elif test "x${SSL_CRYPTO_LIBNAME}" = "xsslcrypto"; then
				# This should only be triggered seen OSE
					ssl_linkable=yes
				else
					saveCFLAGS="$CFLAGS"
 					saveLDFLAGS="$LDFLAGS"
					saveLIBS="$LIBS"
 					CFLAGS="$CFLAGS $SSL_INCLUDE"
					if test "x$SSL_STATIC_ONLY" = "xyes"; then
						LIBS="${SSL_LIBDIR}/lib${SSL_CRYPTO_LIBNAME}.a"
					else
						LDFLAGS="$LDFLAGS -L$SSL_LIBDIR"
						LIBS="$LIBS -l${SSL_CRYPTO_LIBNAME}"
					fi
 					AC_TRY_LINK([
					#include <stdio.h>
 					#include <openssl/hmac.h>],
 					[ 
 					HMAC_CTX hc;
 					HMAC_CTX_init(&hc);		
 					],
 					[ssl_linkable=yes],
 					[ssl_linkable=no])
 					CFLAGS="$saveCFLAGS"
 					LDFLAGS="$saveLDFLAGS"
					LIBS="$saveLIBS"
				fi
 			fi
	 		if test "x$ssl_found" = "xyes" && test "x$ssl_linkable" = "xyes"; then
			 	AC_MSG_RESULT([$dir])
	   			break;
         		fi
		fi	
       fi
    done

    if test "x$ssl_found" != "xyes" ; then
	dnl 
	dnl If no SSL found above, check whether we are running on OpenBSD.
	dnl
	case $host_os in
	openbsd*)
	       if test -f "$erl_xcomp_isysroot/usr/include/openssl/opensslv.h"; then
		  # Trust OpenBSD to have everything the in the correct locations.
		  ssl_found=yes
		  ssl_linkable=yes
		  SSL_ROOT="$erl_xcomp_sysroot/usr"
	          AC_MSG_RESULT([$SSL_ROOT])
		  SSL_RUNTIME_LIB="/usr/lib"
		  SSL_LIB="$erl_xcomp_sysroot/usr/lib"
		  SSL_BINDIR="/usr/sbin"
		  dnl OpenBSD requires us to link with -L and -l
		  SSL_DYNAMIC_ONLY="yes" 
		fi
		;;
	esac
    fi
dnl		Now, certain linuxes have a 64bit libcrypto
dnl		that cannot build shared libraries (i.e. not PIC)
dnl		One could argue that this is wrong, but
dnl		so it is - be adoptable
    if test "$ssl_found" = "yes" && test "$ssl_linkable" = "yes" && test "$SSL_DYNAMIC_ONLY" != "yes"; then
	case $host_os in
		linux*)
			saveCFLAGS="$CFLAGS"
 			saveLDFLAGS="$LDFLAGS"
			saveLIBS="$LIBS"
 			CFLAGS="$DED_CFLAGS $SSL_INCLUDE"
 			LDFLAGS="$DED_LDFLAGS"
			LIBS="$SSL_LIBDIR/libcrypto.a $STATIC_ZLIB_LIBS"
 			AC_TRY_LINK([
			#include <stdio.h>
 			#include <openssl/hmac.h>],
 			[ 
 			HMAC_CTX hc;
 			HMAC_CTX_init(&hc);		
 			],
 			[ssl_dyn_linkable=yes],
 			[ssl_dyn_linkable=no])
 			CFLAGS="$saveCFLAGS"
 			LDFLAGS="$saveLDFLAGS"
			LIBS="$saveLIBS"
			if test "x$ssl_dyn_linkable" != "xyes"; then
				SSL_DYNAMIC_ONLY=yes
				AC_MSG_WARN([SSL will be linked against dynamic lib as static lib is not purely relocatable])
			fi
			;;
	esac
    fi					
	
				


    if test "x$ssl_found" != "xyes" || test  "x$ssl_linkable" != "xyes"; then
       if test "x$ssl_found" = "xyes"; then 
       		AC_MSG_RESULT([found; but not usable])
       else
       		AC_MSG_RESULT([no])
       fi
       SSL_APP=
       CRYPTO_APP=
       SSH_APP=
       AC_MSG_WARN([No (usable) OpenSSL found, skipping ssl, ssh and crypto applications])

       for a in ssl crypto ssh; do
           echo "No usable OpenSSL found" > $ERL_TOP/lib/$a/SKIP
       done
    fi
    ;;
  *)
    # Option given with PATH to package
    if test ! -d "$with_ssl" ; then
       AC_MSG_ERROR(Invalid path to option --with-ssl=PATH)
    fi
    SSL_ROOT="$with_ssl"
    SSL_CRYPTO_LIBNAME=crypto
    SSL_SSL_LIBNAME=ssl
    if test "x$MIXED_CYGWIN" = "xyes" -o "x$MIXED_MSYS" = "xyes" && test -d "$with_ssl/lib/VC"; then
	if test -f "$with_ssl/lib/VC/libeay32.lib"; then
	    SSL_LIBDIR="$with_ssl/lib/VC"
	    SSL_CRYPTO_LIBNAME=libeay32
	    SSL_SSL_LIBNAME=ssleay32
	elif test -f "$with_ssl/lib/VC/openssl.lib"; then 
	    SSL_LIBDIR="$with_ssl/lib/VC"
	elif test -f $with_ssl/lib/VC/libeay32MD.lib; then
	    SSL_CRYPTO_LIBNAME=libeay32MD
            SSL_SSL_LIBNAME=ssleay32MD
	    if test "x$enable_dynamic_ssl" = "xno" && \
	       test -f  $with_ssl/lib/VC/static/libeay32MD.lib; then
		SSL_LIBDIR="$with_ssl/lib/VC/static"
	    else
		SSL_LIBDIR="$with_ssl/lib/VC"
            fi 
	elif test -f "$with_ssl/lib/libeay32.lib"; then
	    SSL_LIBDIR="$with_ssl/lib"
	    SSL_CRYPTO_LIBNAME=libeay32
	    SSL_SSL_LIBNAME=ssleay32
	else
	    # This probably wont work, but that's what the user said, so...
	    SSL_LIBDIR="$with_ssl/lib"
	fi
    elif test -f "$dir/lib/powerpc/libsslcrypto.a"; then
	    SSL_CRYPTO_LIBNAME=sslcrypto
	    SSL_LIBDIR="$with_ssl/lib/powerpc/"
    elif test "x$ac_cv_sizeof_void_p" = "x8"; then
	if test -f "$with_ssl/lib64/libcrypto.a"; then
		SSL_LIBDIR="$with_ssl/lib64"
	elif test -f "$with_ssl/lib/64/libcrypto.a"; then
		SSL_LIBDIR="$with_ssl/lib/64"
	elif test -f "$with_ssl/lib64/libcrypto.so"; then
		SSL_LIBDIR="$with_ssl/lib64"
	elif test -f "$with_ssl/lib/64/libcrypto.so"; then
		SSL_LIBDIR="$with_ssl/lib/64"
	else
		SSL_LIBDIR="$with_ssl/lib"
	fi
    else	 
	SSL_LIBDIR="$with_ssl/lib"
    fi
    if test '!' -f "${SSL_LIBDIR}/lib${SSL_CRYPTO_LIBNAME}.a"; then
	SSL_DYNAMIC_ONLY=yes
    elif test '!' -f ${SSL_LIBDIR}/lib${SSL_CRYPTO_LIBNAME}.so -a '!' -f "$SSL_LIBDIR/lib${SSL_CRYPTO_LIBNAME}.dylib"; then
	SSL_STATIC_ONLY=yes
    fi
    SSL_INCLUDE="-I$with_ssl/include"
    SSL_APP=ssl
    CRYPTO_APP=crypto
    SSH_APP=ssh
    if test "$cross_compiling" = "yes"; then
	SSL_RUNTIME_LIBDIR=`echo "$SSL_LIBDIR" | sed -n "s|^$erl_xcomp_sysroot\(.*\)\$|\1|p"`
    else
	SSL_RUNTIME_LIBDIR="$SSL_LIBDIR"
    fi
esac

if test "x$SSL_APP" != "x" ; then
    dnl We found openssl, now check if we use kerberos 5 support
    AC_MSG_CHECKING(for OpenSSL kerberos 5 support)
    old_CPPFLAGS=$CPPFLAGS
    CPPFLAGS=$SSL_INCLUDE
    AC_EGREP_CPP(yes,[
#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_KRB5
  yes
#endif
      ],[
      AC_MSG_RESULT([yes])
      ssl_krb5_enabled=yes
      if test "x$SSL_DYNAMIC_ONLY" != "xyes"; then
          if test -f "$SSL_LIBDIR/libkrb5.a"; then
              SSL_LINK_WITH_KERBEROS=yes
	      STATIC_KERBEROS_LIBS="$SSL_LIBDIR/libkrb5.a"
	      if test -f "$SSL_LIBDIR/libkrb5support.a"; then
		  STATIC_KERBEROS_LIBS="$STATIC_KERBEROS_LIBS $SSL_LIBDIR/libkrb5support.a"
	      fi
	      if test -f "$SSL_LIBDIR/libk5crypto.a"; then
		  STATIC_KERBEROS_LIBS="$STATIC_KERBEROS_LIBS $SSL_LIBDIR/libk5crypto.a"
	      fi
	      if test -f "$SSL_LIBDIR/libresolv.a"; then
		  STATIC_KERBEROS_LIBS="$STATIC_KERBEROS_LIBS $SSL_LIBDIR/libresolv.a"
	      fi
	      if test -f "$SSL_LIBDIR/libcom_err.a"; then
		  STATIC_KERBEROS_LIBS="$STATIC_KERBEROS_LIBS $SSL_LIBDIR/libcom_err.a"
	      fi
          else
	      AC_MSG_WARN([Kerberos needed but no kerberos static libraries found])
	      AC_MSG_WARN([Rescanning for dynamic SSL libraries])
	      enable_dynamic_ssl=yes
	      ssl_done=no
	      SSL_LINK_WITH_KERBEROS=no
	      STATIC_KERBEROS_LIBS=""
	      ssl_krb5_enabled=no
	      SSL_WITH_KERBEROS=no
          fi
      else 	
	      SSL_LINK_WITH_KERBEROS=no
	      STATIC_KERBEROS_LIBS=""
      fi
      ],[
      AC_MSG_RESULT([no])
      ssl_krb5_enabled=no
      SSL_WITH_KERBEROS=no
      ])
    CPPFLAGS=$old_CPPFLAGS
    SSL_KRB5_INCLUDE=
    if test "x$ssl_krb5_enabled" = "xyes" ; then
        AC_MSG_CHECKING(for krb5.h in standard locations)
	for dir in $extra_dir "$SSL_ROOT/include" "$SSL_ROOT/include/openssl" \
		"$SSL_ROOT/include/kerberos" \
		"$erl_xcomp_isysroot/cygdrive/c/kerberos/include" \
		"$erl_xcomp_isysroot/usr/local/kerberos/include" \
		"$erl_xcomp_isysroot/usr/kerberos/include" \
		"$erl_xcomp_isysroot/usr/include"
	do
            if test -f "$dir/krb5.h" ; then
                SSL_KRB5_INCLUDE="$dir"
		break
            fi
        done
        if test "x$SSL_KRB5_INCLUDE" = "x" ; then
	    AC_MSG_RESULT([not found])
	    SSL_APP=
	    CRYPTO_APP=
	    SSH_APP=
	    AC_MSG_WARN([OpenSSL is configured for kerberos but no krb5.h found])
	    for a in ssl crypto ssh ; do
	 	echo "OpenSSL is configured for kerberos but no krb5.h found" > $ERL_TOP/lib/$a/SKIP
	    done
        else
            AC_MSG_RESULT([found in $SSL_KRB5_INCLUDE])
            SSL_INCLUDE="$SSL_INCLUDE -I$SSL_KRB5_INCLUDE"
        fi
    fi
fi

done # while test ssl_done != yes

SSL_CC_RUNTIME_LIBRARY_PATH=
SSL_LD_RUNTIME_LIBRARY_PATH=
SSL_DED_LD_RUNTIME_LIBRARY_PATH=
cc_rflg="$CFLAG_RUNTIME_LIBRARY_PATH"
ld_rflg="$LDFLAG_RUNTIME_LIBRARY_PATH"
ded_ld_rflg="$DED_LD_FLAG_RUNTIME_LIBRARY_PATH"

if test "$SSL_APP" != "" && test "$SSL_DYNAMIC_ONLY" = "yes" && \
   { test "$cc_rflg" != "" || test "$ld_rflg" != "" || test "$ded_ld_rflg" != ""; } ; then

    AC_MSG_CHECKING(for ssl runtime library path to use)

    libdirs="/lib"

    if test "$ac_cv_sizeof_void_p" = "8"; then
	dir_lib64=no
	dir_lib_64=no

	case "$SSL_RUNTIME_LIBDIR" in
	    */lib/64 | */lib/64/ ) dir_lib_64=yes;;
	    */lib64 | */lib64/ ) dir_lib64=yes;;
	    *) ;;
	esac

	for dir in $std_ssl_locations; do
	    test $dir_lib_64 = no &&
	    	test -d "$erl_xcomp_sysroot$dir/lib/64" &&
		    dir_lib_64=yes
	    test $dir_lib64 = no &&
		test -d "$erl_xcomp_sysroot$dir/lib64" &&
		    dir_lib64=yes
	done

	test $dir_lib_64 = yes && libdirs="/lib/64 $libdirs"
	test $dir_lib64 = yes && libdirs="/lib64 $libdirs"
    fi

    for type in std x_std curr; do

        cc_rpath="$cc_rflg$SSL_RUNTIME_LIBDIR"
        ld_rpath="$ld_rflg$SSL_RUNTIME_LIBDIR"
        ded_ld_rpath="$ded_ld_rflg$SSL_RUNTIME_LIBDIR"
	rpath="$SSL_RUNTIME_LIBDIR"

	if test $type != curr; then
	    for ldir in $libdirs; do
		for dir in $std_ssl_locations; do
		    test "$SSL_LIBDIR" != "$dir$ldir" || continue
		    test $type != x_std || test -d "$dir$ldir" || continue
		    test "$cc_rflg" = "" ||
			cc_rpath="$cc_rpath $cc_rflg$dir$ldir"
		    test "$ld_rflg" = "" ||
			ld_rpath="$ld_rpath $ld_rflg$dir$ldir"
		    test "$ded_ld_rflg" = "" ||
			ded_ld_rpath="$ded_ld_rpath $ded_ld_rflg$dir$ldir"
		    rpath="$rpath:$dir$ldir"
                done
	    done
	fi

	saveCFLAGS="$CFLAGS"
	saveLDFLAGS="$LDFLAGS"
	saveLIBS="$LIBS"
	CFLAGS="$CFLAGS $SSL_INCLUDE"
	LDFLAGS="$LDFLAGS $ld_rpath -L$SSL_LIBDIR"
	LIBS="-lcrypto"
	AC_TRY_LINK([
                         #include <stdio.h>
                         #include <openssl/hmac.h>
                    ],
                    [ 
                         HMAC_CTX hc;
                         HMAC_CTX_init(&hc);		
                    ],
                    [rpath_success=yes],
                    [rpath_success=no])
	CFLAGS="$saveCFLAGS"
	LDFLAGS="$saveLDFLAGS"
	LIBS="$saveLIBS"

	test "$rpath_success" = "yes" && break
    done

    test "$rpath_success" = "yes" || { cc_rpath=; ld_rpath=; ded_ld_rpath=; rpath=; }

    SSL_CC_RUNTIME_LIBRARY_PATH="$cc_rpath"
    SSL_LD_RUNTIME_LIBRARY_PATH="$ld_rpath"
    SSL_DED_LD_RUNTIME_LIBRARY_PATH="$ded_ld_rpath"

    AC_MSG_RESULT([$rpath])
    test "$rpath" != "" || AC_MSG_WARN([Cannot set run path during linking])
fi

#--------------------------------------------------------------------
# Os mon stuff.
#--------------------------------------------------------------------
AC_SUBST(os_mon_programs)
AC_SUBST(CPU_SUP_LIBS)

AC_CHECK_LIB(kstat, kstat_open, [ 
	os_mon_programs="$os_mon_programs cpu_sup"	 
	CPU_SUP_LIBS="$CPU_SUP_LIBS -lkstat"
	])

case $host_os in
	solaris2*)
		os_mon_programs="$os_mon_programs ferrule mod_syslog" ;;
	linux*)
		os_mon_programs="$os_mon_programs cpu_sup" ;;
esac

			
AC_ARG_WITH(javac,
AS_HELP_STRING([--with-javac=JAVAC], [specify Java compiler to use])
AS_HELP_STRING([--with-javac], [use a Java compiler if found (default)])
AS_HELP_STRING([--without-javac], [don't use any Java compiler]))

dnl
dnl Then there are a number of apps which needs a java compiler...
dnl
need_java="jinterface ic/java_src"

# Remove all SKIP files from previous runs
for a in $need_java ; do
  /bin/rm -f $ERL_TOP/lib/$a/SKIP
done

if test "X$with_javac" = "Xno"; then
  for a in $need_java ; do
	echo "Java compiler disabled by user" > $ERL_TOP/lib/$a/SKIP
  done

else # begin - try to find javac

if test "X$with_javac" != "Xyes" -a "X$with_javac" != "X"; then
    check_javac=$with_javac
else
  check_javac="javac.sh javac guavac gcj jikes bock"
fi

AC_CHECK_PROGS(JAVAC, $check_javac)
if test -n "$JAVAC"; then
  dnl Make sure it's at least JDK 1.5
  AC_CACHE_CHECK(for JDK version 1.5, 
     ac_cv_prog_javac_ver_1_5,
     [ERL_TRY_LINK_JAVA([], [for (String i : args);],
        ac_cv_prog_javac_ver_1_5=yes, ac_cv_prog_javac_ver_1_5=no)])
  if test $ac_cv_prog_javac_ver_1_5 = no; then
    unset -v JAVAC
  fi
fi
if test -z "$JAVAC"; then

  if test "X$with_javac" != "X"; then
  	AC_MSG_ERROR([No java compiler found in PATH (checked for $check_javac)])
  fi

  AC_MSG_WARN([Could not find any usable java compiler, will skip: jinterface])

  for a in $need_java ; do
	echo "No Java compiler found" > $ERL_TOP/lib/$a/SKIP
  done
fi

fi # end - try to find javac

dnl
dnl Orber has a c++ example, this isn't the right way to check for
dnl it, but....
dnl
AC_SUBST(CXXFLAGS)
dnl this deliberately does not believe that 'gcc' is a C++ compiler
AC_CHECK_TOOLS(CXX, [$CCC c++ g++ CC cxx cc++ cl], false)

# Remove SKIP file from previous run
/bin/rm -f $ERL_TOP/lib/orber/SKIP

if test "$CXX" = false; then
  echo "No C++ compiler found" > $ERL_TOP/lib/orber/SKIP
fi

dnl ----------------------------------------------------------------------
dnl Include CPPFLAGS in CFLAGS
dnl ----------------------------------------------------------------------
CFLAGS="$CFLAGS $CPPFLAGS"

#
# Currently if we compile for 64 bits we want to compile
# some external port programs using 32 bits
#

# If not defined we trust the C compiler in $CC to do 32 bits
if test -z "$CC32"; then
  CC32="$CC"
fi

if test -z "$CFLAGS32"; then
  if test $ac_cv_sizeof_void_p != 4; then
    # We are compiling default 64 bits and use -m32 for 32 bit compilations
    CFLAGS32="$CFLAGS -m32"
  else
    CFLAGS32="$CFLAGS"
  fi
fi

AC_SUBST(CC32)
AC_SUBST(CFLAGS32)

dnl
dnl ERTS_EMU_CMDLINE_FLAGS will force modification of config.h when
dnl the emulator command line flags are modified by configure, which
dnl in turn will make 'make' detect that files depending on config.h
dnl needs to be rebuilt.
dnl

AC_DEFINE_UNQUOTED(ERTS_EMU_CMDLINE_FLAGS,
"$STATIC_CFLAGS $CFLAGS $DEBUG_CFLAGS $EMU_THR_DEFS $DEFS $WERRORFLAGS $WFLAGS",
[The only reason ERTS_EMU_CMDLINE_FLAGS exists is to force modification of config.h when the emulator command line flags are modified by configure])

dnl ----------------------------------------------------------------------
dnl Directories needed for the build
dnl ----------------------------------------------------------------------

erts=${erl_top}/erts

erts_dirs="								
  $erts/obj $erts/obj.debug
									
  $erts/obj/$host
  $erts/obj.debug/$host

"
for d in ${erl_top}/bin ${erl_top}/bin/$host $erts_dirs ;
do
  if test ! -d $d; then
    mkdir -p 1>/dev/null 2>&1 $d
  fi
done

dnl ---------------------------------------------------------------------
dnl Autoheader macro for adding code at top and bottom of config.h.in
dnl ---------------------------------------------------------------------
AH_TOP([
#define GHBN_R_SOLARIS  2
#define GHBN_R_AIX      3
#define GHBN_R_GLIBC    4
])

AH_BOTTOM([
/* Redefine in6_addr. XXX this should be moved to the files where it's used? */
#ifdef HAVE_IN_ADDR6_STRUCT
#define in6_addr in_addr6
#endif

/* Define a reasonable default for INADDR_LOOPBACK */
/* XXX this should be moved to the files where it's used? */
#ifdef HAVE_NO_INADDR_LOOPBACK
#define INADDR_LOOPBACK (u_long)0x7F000001
#endif

#ifdef REDEFINE_FD_SETSIZE
#define FD_SETSIZE 1024
#endif
 
#ifdef HAVE_GETHRVTIME_PROCFS_IOCTL
#define HAVE_GETHRVTIME
#endif

#ifndef HAVE_FINITE
# if defined(HAVE_ISINF) && defined(HAVE_ISNAN)
#  define USE_ISINF_ISNAN
# endif
#endif

#if defined(DEBUG) && defined(USE_THREADS) && !defined(ERTS_ENABLE_LOCK_CHECK)
#define ERTS_ENABLE_LOCK_CHECK 1
#endif
])

if test "x$GCC" = xyes; then
  CFLAGS="$WERRORFLAGS $CFLAGS"
fi

dnl ----------------------------------------------------------------------
dnl Output the result.
dnl ----------------------------------------------------------------------

dnl  Note that the output files are relative to $srcdir

AC_OUTPUT(
  emulator/$host/Makefile:emulator/Makefile.in
  epmd/src/$host/Makefile:epmd/src/Makefile.in
  etc/common/$host/Makefile:etc/common/Makefile.in
  include/internal/$host/ethread.mk:include/internal/ethread.mk.in
  include/internal/$host/erts_internal.mk:include/internal/erts_internal.mk.in
  lib_src/$host/Makefile:lib_src/Makefile.in
  Makefile:Makefile.in
  ../make/$host/otp.mk:../make/otp.mk.in
  ../make/$host/otp_ded.mk:../make/otp_ded.mk.in
  ../make/$host/ose_lm.mk:../make/ose_lm.mk.in
dnl
dnl The ones below should be moved to their respective lib
dnl
  ../lib/ic/c_src/$host/Makefile:../lib/ic/c_src/Makefile.in
  ../lib/os_mon/c_src/$host/Makefile:../lib/os_mon/c_src/Makefile.in
dnl  ../lib/ssl/c_src/$host/Makefile:../lib/ssl/c_src/Makefile.in
  ../lib/crypto/c_src/$host/Makefile:../lib/crypto/c_src/Makefile.in
  ../lib/orber/c_src/$host/Makefile:../lib/orber/c_src/Makefile.in
  ../lib/runtime_tools/c_src/$host/Makefile:../lib/runtime_tools/c_src/Makefile.in
  ../lib/tools/c_src/$host/Makefile:../lib/tools/c_src/Makefile.in
  )