[multiple changes]

[thirdparty/gcc.git] / libgomp / configure.ac

diff --git a/libgomp/configure.ac b/libgomp/configure.ac
index 2ae6deff0a6de121c8ed64ca58b606a141794053..08f67243dcd97d4af23a61f618352139739a4ed2 100644 (file)
--- a/libgomp/configure.ac
+++ b/libgomp/configure.ac
@@ -139,12 +139,11 @@ AC_SUBST(libtool_VERSION)
 AC_STDC_HEADERS
 AC_HEADER_TIME
 AC_CHECK_HEADERS(unistd.h semaphore.h sys/loadavg.h sys/time.h)
-AC_CHECK_HEADER([pthread.h],[],
-  [AC_MSG_ERROR([Pthreads are required to build libgomp])])
 
 GCC_HEADER_STDINT(gstdint.h)
 
 # Check to see if -pthread or -lpthread is needed.  Prefer the former.
+# In case the pthread.h system header is not found, this test will fail.
 XPCFLAGS=""
 CFLAGS="$CFLAGS -pthread"
 AC_LINK_IFELSE(
@@ -165,6 +164,15 @@ AC_LINK_IFELSE(
 # Check for functions needed.
 AC_CHECK_FUNCS(getloadavg clock_gettime)
 
+# Check for broken semaphore implementation on darwin.
+# sem_init returns: sem_init error: Function not implemented.
+case "$host" in
+  *-darwin*)
+    AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,
+       Define if the POSIX Semaphores do not work on your system.)
+    ;;
+esac
+
 # At least for glibc, clock_gettime is in librt.  But don't pull that
 # in if it still doesn't give us the function we want.
 if test $ac_cv_func_clock_gettime = no; then