aboutsummaryrefslogblamecommitdiffstats
path: root/erts/configure.in
blob: 6278af3a2ea6279ebfa0ff3470d304ac8faed531 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
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
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


                                                                           


                                                         




                                                                       
   



                                                                          
   







                                                               

                




























































                                                                                  


                      









                                                                                                                                                                                                              















                                                                          







                                                        







                                                                                        






































































































                                                                                               












                                                                                                                             

























































































                                                                                                      


















                                                     










                                                             









                                                                          
             


















                                                                             


                                            































































                                                                                                




























                                                                 















                                                









                                                  
 


























                                                                                                 




                                                                 









                                                                             
















                                                                           
                                                              




                                                    

                                   
    


                                           










                                               

                                                          


                        
 




















































































































                                                                                 









                                                                        





















                                                             


















                                                                                      













                                                                        
                                  

























































































                                                                                
 









                                                                    









































































































































































































































































































































































































































































































































































                                                                                                     
                                                         


                                                                    
                                                       
















                                                                           
                                       





































































                                                                          






                          






























































                                                                                                      












                                                                                                                                                   
 



                                                                                                        
 
  
 




                                                                            




































                                                                                









                                                                                        
                                                 




                                                                                     




                                                                                    
                                                                           
                                                  
                                                                                              




























                                                                               


















































































































































































































































                                                                                                                                        







                                                                                                        
 





                                                                              



























































































































































































































































                                                                                  








                                                                                                          
                                                                  




                                                                               











                                     
                                                                        




                                                                      
                                                                                                                                                          




                               





































                                                                                                           




































































































































































































































































































































































































                                                                                                                                                                                                                                                                                                                                                                                     
                                   














                                                           
















                                                  





























































































                                                                       
  











                                                                                  
                               






                                                                                                         


        





































































































































                                                                                                                     



                                                                                
    
 


















                                                                


               






                                                                  
 
  
 

                            




                                                                                       















                                                                                                 





                                                                  
                                       





























                                                                           
          













                                                                              
                                   



                                                                               


















































































                                                                                                     


                   






                                                                                
 
                              







                                                                           


























                                                                            
                                                                                                                                                                                                                                     
 






                                              



                                  










                                             
 

                                                                  

                              
                                     

                
                              
































                                                                                 
                            
                                                                              


                            
                                                                              
                                                    

                                                         


                                                         



                            
                                                                              


                                                         


                                                         













                                                                                     


                                                     

  




                                                            












                                                          

                         



                                          

                          





















                                                                             


                                         






                                

                                                                                                                                                      








                                                                         





                                                                                                     





                                                                                         

                                                     















































































                                                                             

                                              


               




                                                                                    
                               
                                           
        

                

























                                                                               


                                                                              


                                                        


                                                                   
                                                        


                                                                 






                                                                         
                                                                        

                                                                            
                                                                         

                                                                            
                                                                        

                                                                             
                                                                         

                                                                
                                                                      


                                                             
                                                              





                                                            
                                      
                                                   




                                                                               




                                                                               
                      










































                                                                        
                                                                                              












                                                                           
                                                                                    


                                                                                  
                                                   
                                            

                                                      











                                                                 
                                                                                                           






























                                                                                                                             
                                                                             













                                                                                          

      




                                                           
                                                                         























                                                          





                                                                                             














                                                                
                                                  

                                                          
                                                             

                                                                                           
                                                          

                                                                                        
                                                        

                                                                                      
                                                         
























                                                                                       





                                                                               























                                                                                                    




























































































                                                                                          

















                                                                        




                                                                










                                                                  













                                                                    










                                                                    




                                                                                 






                                                                               

                            



                                                                  

                                                                   
                                                         







































































































































                                                                                                                                                    

   
dnl Process this file with autoconf to produce a configure script. -*-m4-*-

dnl %CopyrightBegin%
dnl
dnl Copyright Ericsson AB 1997-2010. 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}

# 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

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)
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,
[  --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
  fi	
])

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

AC_ARG_ENABLE(halfword-emulator,
[  --enable-halfword-emulator        enable halfword emulator (only for 64bit builds)
  --disable-halfword-emulator        disable halfword emulator (only for 64bit builds)],
[ case "$enableval" in
    no) enable_halfword_emualtor=no ;;
    *)  enable_halfword_emulator=yes ;;
  esac ], enable_halfword_emulator=unknown)

AC_ARG_ENABLE(smp-support,
[  --enable-smp-support    enable smp support
  --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_WITH(termcap,
[  --with-termcap          use termcap (default)
  --without-termcap       do not use any termcap libraries (ncurses,curses,termcap,termlib)],
[],
[with_termcap=yes])


AC_ARG_ENABLE(hybrid-heap,
[  --enable-hybrid-heap    enable hybrid heap
  --disable-hybrid-heap   disable hybrid heap],
[ case "$enableval" in
    no) enable_hybrid_heap=no ;;
    *)  enable_hybrid_heap=yes ;;
  esac ], enable_hybrid_heap=unknown)

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

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

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

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

AC_ARG_ENABLE(tsp,
[  --enable-tsp            compile tsp app])

AC_ARG_ENABLE(elib-malloc,
[  --enable-elib-malloc    use elib_malloc instead of normal malloc])

AC_ARG_ENABLE(fp-exceptions,
[  --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,
[  --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,
[  --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,
[  --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,
[  --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_ARG_ENABLE(fixalloc,
[  --disable-fixalloc      disable the use of fix_alloc])
if test x${enable_fixalloc} = xno ; then
  AC_DEFINE(NO_FIX_ALLOC,[],
	    [Define if you don't want the fix allocator in Erlang])
fi

AC_SUBST(PERFCTR_PATH)
AC_ARG_WITH(perfctr,
[  --with-perfctr=PATH     specify location of perfctr include and lib
  --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_ENABLE(clock-gettime,
[  --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_ENABLE(native-ethr-impls,
[  --enable-native-ethr-impls enable native ethread implementations
  --disable-native-ethr-impls disable native ethread implementations],
[ case "$enableval" in
    no) disable_native_ethr_impls=yes ;;
    *)  disable_native_ethr_impls=no ;;
  esac ], disable_native_ethr_impls=no)

dnl Defined in libraries/megaco/configure.in but we need it here
dnl also in order to show it to the "top user"

AC_ARG_ENABLE(megaco_flex_scanner_lineno,
[  --disable-megaco-flex-scanner-lineno disable megaco flex scanner lineno])

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)

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
	case $host_os in
		darwin*)
			case $CFLAGS in
			*-m32*)
				;;
			*)
				CFLAGS="-m32 $CFLAGS"
				;;
			esac
			;;
		*)
			if test X${enable_m32_build} = Xyes;
			then
				enable_hipe=no;
				case $CFLAGS in
				*-m32*)
					;;
				*)
					CFLAGS="-m32 $CFLAGS"
				;;
				esac ;
			fi
			;;
	esac
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="$CPPFLAGS -D_WIN32_WINNT=0x0500 -DWINVER=0x0500"
	# _USE_32BIT_TIME_T is needed when using VC++ 2005 (ctime() will fail
	# otherwise since we pass it a 32-bit value).
	#
	# FIXME: Use time_t all the way and remove _USE_32BIT_TIME_T.
	AC_MSG_WARN([Reverting to 32-bit time_t])
	CPPFLAGS="$CPPFLAGS -D_USE_32BIT_TIME_T"
	;;
    darwin*)
        CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE"
        ;;
    *)
	;;
esac



MIXED_CYGWIN=no

AC_MSG_CHECKING(for mixed cygwin and native VC++ environment)
if test "X$host" = "Xwin32" -a "x$GCC" != x"yes"; then
	if test -x /usr/bin/cygpath; then
		CFLAGS="-O2"
		MIXED_CYGWIN=yes
		AC_MSG_RESULT([yes])
		MIXED_CYGWIN_VC=yes
		CPPFLAGS="$CPPFLAGS -DERTS_MIXED_CYGWIN_VC"
	else
		AC_MSG_RESULT([undeterminable])
		AC_MSG_ERROR(Seems to be mixed windows but not with cygwin, cannot handle this!)
	fi
else
	AC_MSG_RESULT([no])
	MIXED_CYGWIN_VC=no
fi
AC_SUBST(MIXED_CYGWIN_VC)

AC_MSG_CHECKING(for mixed cygwin and native MinGW environment)
if test "X$host" = "Xwin32" -a "x$GCC" = x"yes"; then
	if test -x /usr/bin/cygpath; then
		CFLAGS="-O2"
		MIXED_CYGWIN=yes
		AC_MSG_RESULT([yes])
		MIXED_CYGWIN_MINGW=yes
		CPPFLAGS="$CPPFLAGS -DERTS_MIXED_CYGWIN_MINGW"
	else
		AC_MSG_RESULT([undeterminable])
		AC_MSG_ERROR(Seems to be mixed windows but not with cygwin, cannot handle this!)
	fi
else
	AC_MSG_RESULT([no])
	MIXED_CYGWIN_MINGW=no
fi
AC_SUBST(MIXED_CYGWIN_MINGW)

AC_MSG_CHECKING(if we mix cygwin with any native compiler)
if test "X$MIXED_CYGWIN" = "Xyes" ; then
	AC_MSG_RESULT([yes])	
else
	AC_MSG_RESULT([no])
fi

AC_SUBST(MIXED_CYGWIN)
	
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_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 $host_os in
  darwin*)
	CFLAG_RUNTIME_LIBRARY_PATH=
	CFLAGS="$CFLAGS -no-cpp-precomp"
	;;
  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
  # 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=""
fi
dnl DEBUG_FLAGS is obsolete (I hope)
AC_SUBST(DEBUG_FLAGS)
AC_SUBST(DEBUG_CFLAGS)
AC_SUBST(WFLAGS)
AC_SUBST(CFLAG_RUNTIME_LIBRARY_PATH)

AC_CHECK_SIZEOF(void *) # Needed for ARCH and smp checks below

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;;
    ppc)	ARCH=ppc;;
    ppc64)	ARCH=ppc64;;
    "Power Macintosh")	ARCH=ppc;;
    armv5b)	ARCH=arm;;
    armv5teb)	ARCH=arm;;
    armv5tel)	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
	amd64-darwin*)
		LIBCARBON=
		AC_MSG_RESULT([no])
		;;
	*-darwin*)
		LIBCARBON="-framework Carbon "
		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])
		AC_MSG_RESULT([yes])
	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 can not be built])
fi

AC_CHECK_PROGS(FOP, fop)
if test -z "$FOP"; then
  echo "fop" >> doc/CONF_INFO
  AC_MSG_WARN([No 'fop' command found: the documentation can not be built])
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="$LDFLAGS"
LD='$(CC)'
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, vxworks or win32
if test "X$host" = "Xwin32"; then
	ERLANG_OSTYPE=win32
else
	ERLANG_OSTYPE=unix         
fi

AC_SUBST(ERLANG_OSTYPE)

dnl Which sysv4 would this be, and what is it for???
dnl XXX: replace with feature tests.
case $host_os in
  sysv4*)
    AC_DEFINE(SOCKOPT_CONNECT_STAT,[],[Obscure SYSV feature])
    AC_DEFINE(NO_PRAGMA_WEAK,[],[Obscure SYSV feature])
    LIBS="$LIBS -lgen -lc -L /usr/ucblib -lucb"
    ;;
esac

# 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])
	enable_threads=force
fi

AC_SUBST(ERTS_BUILD_SMP_EMU)



#
# 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)
		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 $emu_threads != yes; then
	enable_lock_check=no
	enable_lock_count=no
else
	# Threads enabled for emulator
	EMU_THR_LIB_NAME=$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
	
	disable_child_waiter_thread=no
	case $host_os in
	    solaris*)
		enable_child_waiter_thread=yes
		;;
	    linux*)
		AC_DEFINE(USE_RECURSIVE_MALLOC_MUTEX,[1],
			[Define if malloc should use a recursive mutex])
		AC_MSG_CHECKING([whether dlopen() needs to be called before first call to dlerror()])
		if test "x$ETHR_THR_LIB_BASE_NAME" != "xnptl"; 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_NAME" != "xnptl"; then
		    # Child waiter thread cannot be enabled
		    disable_child_waiter_thread=yes
		    enable_child_waiter_thread=no
		fi
		;;
	    win32)
		# 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)

ERTS_INTERNAL_X_LIBS=

AC_CHECK_LIB(kstat, kstat_open,
[AC_DEFINE(HAVE_KSTAT, 1, [Define if you have kstat])
ERTS_INTERNAL_X_LIBS="$ERTS_INTERNAL_X_LIBS -lkstat"])

AC_SUBST(ERTS_INTERNAL_X_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="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

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

AC_ARG_ENABLE(shared-zlib,
[  --enable-shared-zlib        enable using shared zlib library
  --disable-shared-zlib       disable shared zlib, compile own zlib source (default)],
[ case "$enableval" in
    no) enable_shared_zlib=no ;;
    *)  enable_shared_zlib=yes ;;
  esac ], enable_shared_zlib=no)

Z_LIB=

if test "x$enable_shared_zlib" = "xyes" ; then
	AC_CHECK_LIB(z, adler32_combine,
		[Z_LIB="-lz"
		 AC_DEFINE(HAVE_LIBZ, 1, [Define to 1 if you have the `z' library (-lz).])],
		[AC_MSG_ERROR([cannot find any shared zlib])])
else
	AC_MSG_NOTICE([Using own zlib source])
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 mach-o/dyld.h arpa/nameser.h \
		 pty.h util.h utmp.h langinfo.h poll.h)

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" = "xyes" ; 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
	])
    AC_CHECK_DECLS([SCTP_UNORDERED, SCTP_ADDR_OVER, SCTP_ABORT,
                    SCTP_EOF, SCTP_SENDALL, SCTP_ADDR_CONFIRMED], [], [],
        [#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

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)

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

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_FUNC(getaddrinfo, have_getaddrinfo=yes, have_getaddrinfo=no)
if test $have_getaddrinfo = yes; then
        AC_MSG_CHECKING([whether getaddrinfo accepts enough flags])
        AC_TRY_RUN([
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netdb.h>
int main(int argc, char **argv) {
    struct addrinfo hints, *ai;
    memset(&hints, 0, sizeof(hints));
    hints.ai_flags = (AI_CANONNAME|AI_V4MAPPED|AI_ADDRCONFIG);
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_family = AF_INET6;
    if (getaddrinfo("::", NULL, &hints, &ai) == 0) {
	freeaddrinfo(ai);
	exit(0);
    } else {
	exit(1);
    }
}
	],, have_getaddrinfo=no,
	[
	case X$erl_xcomp_getaddrinfo in
	    X) have_getaddrinfo=cross;;
	    Xyes|Xno) have_getaddrinfo=$erl_xcomp_getaddrinfo;;
	    *) AC_MSG_ERROR([Bad erl_xcomp_getaddrinfo value: $erl_xcomp_getaddrinfo]);;
	esac
	])
	AC_MSG_RESULT($have_getaddrinfo)
	case $have_getaddrinfo in
	    yes)
		AC_DEFINE(HAVE_GETADDRINFO, [1], 
		          [Define to 1 if you have a good `getaddrinfo' function.]);;
	    cross)
		AC_MSG_WARN([result no guessed because of cross compilation]);;
	    *) ;;
	esac
fi
AC_CHECK_FUNCS([getnameinfo getipnodebyname getipnodebyaddr gethostbyname2])

AC_CHECK_FUNCS([ieee_handler fpsetmask finite isnan isinf res_gethostbyname dlopen \
		pread pwrite writev memmove strerror strerror_r strncasecmp \
		gethrtime localtime_r gmtime_r mmap mremap memcpy mallopt \
		sbrk _sbrk __sbrk brk _brk __brk \
		flockfile fstat strlcpy strlcat setsid posix2time setlocale nl_langinfo poll])
if test "X$host" = "Xwin32"; then
	ac_cv_func_setvbuf_reversed=yes
fi
AC_FUNC_SETVBUF_REVERSED	

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])

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_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 "$M4"; then
	enable_hipe=no
   	AC_MSG_NOTICE([HiPE disabled as no valid m4 is found in PATH])
  else
  	case "$ARCH-$OPSYS" in
	    x86-linux|amd64-linux|x86-darwin*|amd64-darwin*|ppc-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
   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__)

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(__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(__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 compile TSP app
#

TSP_APP=
if test X${enable_tsp} = Xyes; then
  TSP_APP=tsp
fi
AC_SUBST(TSP_APP)

#
# Check if we should build hybrid emulator
#

AC_MSG_CHECKING([whether a hybrid heap emulator should be built])
case $enable_hybrid_heap-$host_os in
    yes-*)
	AC_MSG_RESULT([yes; enabled by user])
	ERTS_BUILD_HYBRID_EMU=yes;;
    no-*)
	AC_MSG_RESULT([no; disabled by user])
	ERTS_BUILD_HYBRID_EMU=no;;
    *-win32|*-vxworks|*-ose) # vxworks and ose have their own "configure scripts"...
	AC_MSG_RESULT([no; default on this platform])
	ERTS_BUILD_HYBRID_EMU=no;;
    *)
	AC_MSG_RESULT([yes; default on this platform])
	ERTS_BUILD_HYBRID_EMU=yes;;
esac


if test $ERTS_BUILD_HYBRID_EMU = yes; then
    AC_DEFINE(ERTS_HAVE_HYBRID_EMU, 1, [Define if the hybrid emulator is built])
fi

AC_SUBST(ERTS_BUILD_HYBRID_EMU)

#
# 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])
  elif test X$FPE != Xreliable -a X$ARCH != Xarm; then
	AC_MSG_WARN([HiPE is not supported on $ARCH without reliable floating-point exceptions])
  else
     HIPE_ENABLED=yes
     AC_DEFINE(HIPE,[1],[Define to enable HiPE])
     HIPE_HELPERS="xmerl syntax_tools edoc"
     ENABLE_ALLOC_TYPE_VARS="$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 if we should use elib_malloc.
#

if test X${enable_elib_malloc} = Xyes; then
 AC_DEFINE(ENABLE_ELIB_MALLOC,[],[Define to enable use of elib_malloc (a malloc() replacement)])
 AC_DEFINE(ELIB_HEAP_SBRK,[],[Elib sbrk])
 AC_DEFINE(ELIB_ALLOC_IS_CLIB,[],[Use elib malloc as clib])
 AC_DEFINE(ELIB_SORTED_BLOCKS,[],[Define to enable the use of sorted blocks when using elib_malloc])
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_CFLAGS="$DED_CFLAGS -fPIC"
fi

DED_EXT=so
case $host_os in
    win32) DED_EXT=dll;;
    darwin*)
	DED_CFLAGS="$DED_CFLAGS -fno-common"
	if test "X$STATIC_CFLAGS" = "X"; then
	    STATIC_CFLAGS="-mdynamic-no-pic"
	fi;;
    *)
	;;
esac

# 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
	;;	
	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_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 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_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)
AC_SUBST(OPENSSL_CMD)

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

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

AC_ARG_ENABLE(dynamic-ssl-lib,
[  --enable-dynamic-ssl-lib        enable using dynamic openssl libraries
  --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

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/"
		urp="uninstall/openssl_is1/inno setup: app path"
		rp="$wrp$urp"
		if regtool -q get "$rp" > /dev/null; then
			ssl_install_dir=`regtool -q get "$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
    fi
    # We search for OpenSSL in the common OS standard locations.
    SSL_APP=ssl
    CRYPTO_APP=crypto
    SSH_APP=ssh

    AC_MSG_CHECKING(for OpenSSL >= 0.9.7 in standard locations) 
    for rdir in $extra_dir /cygdrive/c/OpenSSL $std_ssl_locations; do
	dir="$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$MIXED_CYGWIN" = "xyes" ; then
			if test -f "$dir/lib/VC/ssleay32.lib" || \
			   test -f "$dir/lib/VC/openssl.lib"; then 
				SSL_RUNTIME_LIBDIR="$rdir/lib/VC"
				SSL_LIBDIR="$dir/lib/VC"
			elif test -f "$dir/lib/ssleay32.lib" || \
			     test -f "$dir/lib/openssl.lib"; then
				SSL_RUNTIME_LIBDIR="$rdir/lib"
				SSL_LIBDIR="$dir/lib"
			else
				is_real_ssl=no
			fi
		else
			if test "x$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 $SSL_LIBDIR/libcrypto.a; then
			SSL_DYNAMIC_ONLY=yes
		fi
		SSL_BINDIR="$rdir/bin"
dnl 		Should one use EXEEXT or ac_exeext?
		if test -f "$erl_xcomp_sysroot$SSL_BINDIR/openssl$EXEEXT"; then
		    if test "$cross_compiling" = "yes"; then
			dnl Cannot test it; hope it is working...
			OPENSSL_CMD="$SSL_BINDIR/openssl"
		    else
			if "$SSL_BINDIR/openssl" version > /dev/null 2>&1; then
				OPENSSL_CMD="$SSL_BINDIR/openssl"
			else
				is_real_ssl=no
			fi
		    fi
		else
			is_real_ssl=no
		fi
		if test "x$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" ; then
				   	ssl_linkable=yes
				else
					saveCFLAGS="$CFLAGS"
 					saveLDFLAGS="$LDFLAGS"
					saveLIBS="$LIBS"
 					CFLAGS="$CFLAGS $SSL_INCLUDE"
 					LDFLAGS="$LDFLAGS -L$SSL_LIBDIR"
					LIBS="-lcrypto"
 					AC_TRY_LINK([
					#include <stdio.h>
 					#include <openssl/hmac.h>],
 					[ 
 					HMAC_CTX hc;
 					HMAC_CTX_init(&hc);		
 					],
 					[ssl_linkable=yes],
 					[ssl_linkable=no])
 					CFLAGS="$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="$erl_xcomp_sysroot/usr/lib"
		  SSL_BINDIR="/usr/sbin"
		  OPENSSL_CMD="$SSL_BINDIR/openssl"
		  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"
    if test "x$MIXED_CYGWIN" = "xyes" && test -d "$with_ssl/lib/VC"; then
	SSL_LIBDIR="$with_ssl/lib/VC"
    elif test "x$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 $SSL_LIBDIR/libcrypto.a; then
	SSL_DYNAMIC_ONLY=yes
    fi
    SSL_INCLUDE="-I$with_ssl/include"
    OPENSSL_CMD="$with_ssl/bin/openssl"
    SSL_APP=ssl
    CRYPTO_APP=crypto
    SSH_APP=ssh
    if test "$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,
[  --with-javac=JAVAC      specify Java compiler to use
  --with-javac            use a Java compiler if found (default)
  --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 $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
])


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

dnl  Note that the output files are relative to $srcdir

AC_OUTPUT(
  emulator/$host/Makefile:emulator/Makefile.in
  emulator/zlib/$host/Makefile:emulator/zlib/Makefile.in
  emulator/pcre/$host/Makefile:emulator/pcre/Makefile.in
  epmd/src/$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
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
  ../lib/ssl/c_src/$host/Makefile:../lib/ssl/c_src/Makefile.in
  ../lib/ssl/examples/certs/$host/Makefile:../lib/ssl/examples/certs/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
  )