From 9f4ca582555b208d065f730b5ce3b1901136b275 Mon Sep 17 00:00:00 2001 From: Asaf Kahlon Date: Mon, 7 May 2018 23:19:09 +0300 Subject: [PATCH] acinclude.m4: check if -latomic is needed On some cases, -latomic is needed for linking, and since the current acinclude.m4 checks only compilation we can sometimes miss the need for -latomic and the linking process will fail. Therefore, the AC_CHECK_IFELSE was replaced with AC_LINK_IFELSE. If the first try fails, we try to link again with -latomic and add LIBS="-latomic" in case we succeeded. Signed-off-by: Asaf Kahlon --- acinclude.m4 | 32 ++++++++++++++++++++++++++++---- 1 file changed, 28 insertions(+), 4 deletions(-) diff --git a/acinclude.m4 b/acinclude.m4 index f648ed0f..aa35195f 100644 --- a/acinclude.m4 +++ b/acinclude.m4 @@ -668,7 +668,7 @@ dnl # Check if compiler supoorts __atomic_Xxx intrinsics dnl ################################################################################ AC_DEFUN([LIBZMQ_CHECK_ATOMIC_INTRINSICS], [{ AC_MSG_CHECKING(whether compiler supports __atomic_Xxx intrinsics) - AC_COMPILE_IFELSE([AC_LANG_SOURCE([ + AC_LINK_IFELSE([AC_LANG_SOURCE([ /* atomic intrinsics test */ int v = 0; int main (int, char **) @@ -677,9 +677,33 @@ int main (int, char **) return t; } ])], - [AC_MSG_RESULT(yes) ; libzmq_cv_has_atomic_instrisics="yes" ; $1], - [AC_MSG_RESULT(no) ; libzmq_cv_has_atomic_instrisics="no" ; $2] - ) + [libzmq_cv_has_atomic_instrisics="yes"], + [libzmq_cv_has_atomic_instrisics="no"]) + + if test "x$libzmq_cv_has_atomic_instrisics" = "xno"; then + save_LDFLAGS=$LDFLAGS + LDFLAGS="$LDFLAGS -latomic" + AC_LINK_IFELSE([AC_LANG_SOURCE([ + /* atomic intrinsics test */ + int v = 0; + int main (int, char **) + { + int t = __atomic_add_fetch (&v, 1, __ATOMIC_ACQ_REL); + return t; + } + ])], + [libzmq_cv_has_atomic_instrisics="yes" LIBS="-latomic"], + [libzmq_cv_has_atomic_instrisics="no"]) + LDFLAGS=$save_LDFLAGS + fi + + if test "x$libzmq_cv_has_atomic_instrisics" = "xyes"; then + AC_MSG_RESULT(yes) + $1 + else + AC_MSG_RESULT(no) + $2 + fi }]) dnl ################################################################################ -- 2.17.0