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-rw-r--r--m4/ax_pthread.m437
1 files changed, 37 insertions, 0 deletions
diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4
index 4920e073b..07a9cd265 100644
--- a/m4/ax_pthread.m4
+++ b/m4/ax_pthread.m4
@@ -83,6 +83,7 @@
# exception to the GPL to apply to your modified version as well.
#serial 25
+#arctica-serial 1
AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
AC_DEFUN([AX_PTHREAD], [
@@ -334,6 +335,42 @@ for ax_pthread_try_flag in $ax_pthread_flags; do
PTHREAD_LIBS="-lpthread"
;;
+ -pthread)
+ AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
+ PTHREAD_CFLAGS="$ax_pthread_try_flag"
+
+ if test "x$GCC" = "xyes"; then
+ # Thanks to libtool bug #13550, we have to consider the possibility
+ # that -nostdlib will be used during compilation at some point.
+ # Try to determine the first pthread library available,
+ # ignoring any other variants.
+ for ax_pthread_try_lib_flag in $ax_pthread_flags; do
+ case $ax_pthread_try_lib_flag in
+ none|-*|pthread-config)
+ continue
+ ;;
+
+ *)
+ PTHREAD_LIBS="-l$ax_pthread_try_lib_flag"
+
+ ax_pthread_save_LIBS="$LIBS"
+ LIBS="$PTHREAD_LIBS $LIBS"
+
+ # We only need to link a trivial program with
+ # the current library value.
+ # Linking should fail if the library doesn't
+ # exist, otherwise we should be good to go.
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+ [LIBS="$ax_pthread_save_LIBS"
+ break],
+ [LIBS="$ax_pthread_save_LIBS"
+ PTHREAD_LIBS=""])
+ ;;
+ esac
+ done
+ fi
+ ;;
+
-*)
AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
PTHREAD_CFLAGS="$ax_pthread_try_flag"