Try to handle not yet available functionality in MacOSX SDK

2 files changed, 84 insertions, 17 deletions

diff --git a/erts/aclocal.m4 b/erts/aclocal.m4
index 013bfe5652..6c0544da31 100644
--- a/erts/aclocal.m4
+++ b/erts/aclocal.m4
@@ -736,10 +736,23 @@ AC_DEFUN(ERL_MONOTONIC_CLOCK,
 	;;
   esac
 
+  clock_gettime_lib=""
+  AC_CHECK_LIB(rt, clock_gettime, [clock_gettime_lib="-lrt"])
+
+  save_LIBS="$LIBS"
+  LIBS="$LIBS $clock_gettime_lib"
+
+  if test "$LD_MAY_BE_WEAK" != "no"; then
+     trust_test="#error May not be there due to weak linking"
+  else
+     trust_test=""
+  fi
+
   AC_CACHE_CHECK([for clock_gettime(CLOCK_MONOTONIC_RAW, _)], erl_cv_clock_gettime_monotonic_raw,
   [
-       AC_TRY_COMPILE([
+       AC_TRY_LINK([
 #include <time.h>
+$trust_test
 		      ],
 		      [
     struct timespec ts;
@@ -755,8 +768,9 @@ AC_DEFUN(ERL_MONOTONIC_CLOCK,
   AC_CACHE_CHECK([for clock_gettime() with ${check_msg}monotonic clock type], erl_cv_clock_gettime_monotonic_$1,
   [
      for clock_type in $prefer_resolution_clock_gettime_monotonic $default_resolution_clock_gettime_monotonic $high_resolution_clock_gettime_monotonic $low_resolution_clock_gettime_monotonic; do
-       AC_TRY_COMPILE([
+       AC_TRY_LINK([
 #include <time.h>
+$trust_test
 		      ],
 		      [
     struct timespec ts;
@@ -771,7 +785,15 @@ AC_DEFUN(ERL_MONOTONIC_CLOCK,
      done
   ])
 
-  AC_CHECK_FUNCS([clock_getres clock_get_attributes gethrtime])
+  LIBS="$save_LIBS"
+
+  if test "$LD_MAY_BE_WEAK" != "no"; then
+     check_for_clock_getres=
+  else
+     check_for_clock_getres=clock_getres
+  fi
+
+  AC_CHECK_FUNCS([$check_for_clock_getres clock_get_attributes gethrtime])
   
   AC_CACHE_CHECK([for mach clock_get_time() with monotonic clock type], erl_cv_mach_clock_get_time_monotonic,
   [
@@ -840,7 +862,7 @@ AC_DEFUN(ERL_MONOTONIC_CLOCK,
 	    break
 	  fi
       done
-      AC_CHECK_LIB(rt, clock_gettime, [erl_monotonic_clock_lib="-lrt"])
+      erl_monotonic_clock_lib=$clock_gettime_lib
       ;;
     mach_clock_get_time)
       erl_monotonic_clock_id=SYSTEM_CLOCK
@@ -879,11 +901,24 @@ AC_DEFUN(ERL_WALL_CLOCK,
 	;;
   esac
 
+  clock_gettime_lib=""
+  AC_CHECK_LIB(rt, clock_gettime, [clock_gettime_lib="-lrt"])
+
+  save_LIBS="$LIBS"
+  LIBS="$LIBS $clock_gettime_lib"
+
+  if test "$LD_MAY_BE_WEAK" != "no"; then
+     trust_test="#error May not be there due to weak linking"
+  else
+     trust_test=""
+  fi
+
   AC_CACHE_CHECK([for clock_gettime() with ${check_msg}wall clock type], erl_cv_clock_gettime_wall_$1,
   [
      for clock_type in $prefer_resolution_clock_gettime_wall $default_resolution_clock_gettime_wall $high_resolution_clock_gettime_wall $low_resolution_clock_gettime_wall; do
-       AC_TRY_COMPILE([
+       AC_TRY_LINK([
 #include <time.h>
+$trust_test
 		      ],
 		      [
     struct timespec ts;
@@ -898,7 +933,15 @@ AC_DEFUN(ERL_WALL_CLOCK,
      done
   ])
 
-  AC_CHECK_FUNCS([clock_getres clock_get_attributes gettimeofday])
+  LIBS="$save_LIBS"
+
+  if test "$LD_MAY_BE_WEAK" != "no"; then
+     check_for_clock_getres=
+  else
+     check_for_clock_getres=clock_getres
+  fi
+
+  AC_CHECK_FUNCS([$check_for_clock_getres clock_get_attributes gettimeofday])
   
   AC_CACHE_CHECK([for mach clock_get_time() with wall clock type], erl_cv_mach_clock_get_time_wall,
   [
@@ -919,6 +962,7 @@ AC_DEFUN(ERL_WALL_CLOCK,
 			erl_cv_mach_clock_get_time_wall=no)
   ])
 
+  erl_wall_clock_lib=
   erl_wall_clock_low_resolution=no
   erl_wall_clock_id=
   case $1-$erl_cv_clock_gettime_wall_$1-$erl_cv_mach_clock_get_time_wall-$ac_cv_func_gettimeofday-$host_os in
@@ -932,6 +976,7 @@ AC_DEFUN(ERL_WALL_CLOCK,
       ;;
     *-CLOCK_*-*-*-*)
       erl_wall_clock_func=clock_gettime
+      erl_wall_clock_lib=$clock_gettime_lib
       erl_wall_clock_id=$erl_cv_clock_gettime_wall_$1
       for low_res_id in $low_resolution_clock_gettime_wall; do
       	  if test $erl_wall_clock_id = $low_res_id; then
@@ -1680,7 +1725,7 @@ case "$THR_LIB_NAME" in
 	    AC_DEFINE(ETHR_HAVE_SCHED_YIELD, 1, [Define if you have the sched_yield() function.])
 	    AC_MSG_CHECKING([whether sched_yield() returns an int])
 	    sched_yield_ret_int=no
-	    AC_TRY_COMPILE([
+	    AC_TRY_LINK([
 				#ifdef ETHR_HAVE_SCHED_H
 				#include <sched.h>
 				#endif
@@ -1699,7 +1744,7 @@ case "$THR_LIB_NAME" in
 	    AC_DEFINE(ETHR_HAVE_PTHREAD_YIELD, 1, [Define if you have the pthread_yield() function.])
 	    AC_MSG_CHECKING([whether pthread_yield() returns an int])
 	    pthread_yield_ret_int=no
-	    AC_TRY_COMPILE([
+	    AC_TRY_LINK([
 				#if defined(ETHR_NEED_NPTL_PTHREAD_H)
 				#include <nptl/pthread.h>
 				#elif defined(ETHR_HAVE_MIT_PTHREAD_H)
@@ -2436,7 +2481,13 @@ if test $erl_monotonic_clock_low_resolution = yes; then
   AC_DEFINE(ERTS_HAVE_LOW_RESOLUTION_OS_MONOTONIC_LOW, [1], [Define if you have a low resolution OS monotonic clock])
 fi
 
-xrtlib="$erl_monotonic_clock_lib"
+xrtlib=
+if test "$erl_monotonic_clock_lib" != ""; then
+   xrtlib="$erl_monotonic_clock_lib"
+fi
+if test "$erl_wall_clock_lib" != ""; then
+   xrtlib="$erl_wall_clock_lib"
+fi
 if test "x$erl_monotonic_clock_id" != "x"; then
     AC_DEFINE_UNQUOTED(MONOTONIC_CLOCK_ID_STR, ["$erl_monotonic_clock_id"], [Define as a string of monotonic clock id to use])
     AC_DEFINE_UNQUOTED(MONOTONIC_CLOCK_ID, [$erl_monotonic_clock_id], [Define to monotonic clock id to use])
diff --git a/erts/configure.in b/erts/configure.in
index 5c95f2fa35..80f1efe05b 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -875,6 +875,22 @@ dnl for now that is the way we do it.
 USER_LD=$LD
 USER_LDFLAGS="$LDFLAGS"
 LD='$(CC)'
+case $host_os in
+     darwin*)
+	saved_LDFLAGS="$LDFLAGS"
+	LDFLAGS="$LDFLAGS -Wl,-no_weak_imports"
+	AC_TRY_LINK([],[],
+		[
+			LD_MAY_BE_WEAK=no
+		],
+		[
+			LD_MAY_BE_WEAK=yes
+			LDFLAGS="$saved_LDFLAGS"
+		]);;
+    *)
+	LD_MAY_BE_WEAK=no;;
+esac
+
 AC_SUBST(LD)
 
 LDFLAG_RUNTIME_LIBRARY_PATH="$CFLAG_RUNTIME_LIBRARY_PATH"
@@ -1964,7 +1980,7 @@ getaddrinfo("","",NULL,NULL);
 if test $have_getaddrinfo = yes; then
         AC_MSG_RESULT([yes])
         AC_MSG_CHECKING([whether getaddrinfo accepts enough flags])
-        AC_TRY_COMPILE([
+        AC_TRY_LINK([
 #include <stdlib.h>
 #include <string.h>
 #ifdef HAVE_WINSOCK2_H
@@ -2221,7 +2237,7 @@ 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>],
+AC_TRY_LINK([#include <sched.h>],
 [
 #ifndef CPU_SETSIZE
 #error no CPU_SETSIZE
@@ -2244,7 +2260,7 @@ fi
 
 
 AC_MSG_CHECKING([for pset functionality])
-AC_TRY_COMPILE([#include <sys/pset.h>],
+AC_TRY_LINK([#include <sys/pset.h>],
 [
 	int res;
 	psetid_t id = PS_MYID;
@@ -2262,7 +2278,7 @@ if test $pset_functionality = yes; then
 fi
 
 AC_MSG_CHECKING([for processor_bind functionality])
-AC_TRY_COMPILE([
+AC_TRY_LINK([
 #include <sys/types.h>
 #include <sys/processor.h>
 #include <sys/procset.h>
@@ -2278,7 +2294,7 @@ if test $processor_bind_functionality = yes; then
 fi
 
 AC_MSG_CHECKING([for cpuset_getaffinity/cpuset_setaffinity])
-AC_TRY_COMPILE([
+AC_TRY_LINK([
 #include <sys/param.h>
 #include <sys/cpuset.h>
 ],
@@ -2477,7 +2493,7 @@ if test "x$ac_cv_func_sbrk" = "xyes"; then
 	for rtype in $ret_types; do
 	    for atype in $arg_types; do
 		IFS=$save_ifs
-		AC_TRY_COMPILE([#include <sys/types.h>
+		AC_TRY_LINK([#include <sys/types.h>
 				#include <unistd.h>],
 				[$rtype sbrk($atype incr);],
 				[erts_cv_sbrk_ret_arg_types="$rtype,$atype"])
@@ -2514,7 +2530,7 @@ if test $ac_cv_func_brk = yes; then
 	for rtype in $ret_types; do
 	    for atype in $arg_types; do
 		IFS=$save_ifs
-		AC_TRY_COMPILE([#include <sys/types.h>
+		AC_TRY_LINK([#include <sys/types.h>
 				#include <unistd.h>],
 				[$rtype brk($atype endds);],
 				[erts_cv_brk_ret_arg_types="$rtype,$atype"])
@@ -3536,7 +3552,7 @@ fi
 #
 if test $have_kernel_poll = epoll; then
 	AC_MSG_CHECKING([whether epoll is level triggered])
-	AC_TRY_COMPILE([#include <sys/epoll.h>],[
+	AC_TRY_LINK([#include <sys/epoll.h>],[
 			#ifdef EPOLLET
 			/* Edge triggered option exist, assume level triggered
 			   is default */