From: Bart Van Assche <bvanassche@acm.org>
Date: Sun, 21 Sep 2008 11:24:00 +0000 (+0000)
Subject: Made test for compiler atomic builtins more strict, such that drd/tests/atomic_var... 
X-Git-Tag: svn/VALGRIND_3_4_0~252
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9b49dd6e2e2da2277110b0e8cd42c30b7abd3f76;p=thirdparty%2Fvalgrind.git

Made test for compiler atomic builtins more strict, such that drd/tests/atomic_var.c doesn't trigger bug http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34115 in a.o. gcc 4.3.1 when Valgrind is configured with --enable-only32bit.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@8631
---

diff --git a/configure.in b/configure.in
index 422406cb07..3ed11bb783 100644
--- a/configure.in
+++ b/configure.in
@@ -1154,7 +1154,8 @@ AC_MSG_CHECKING([if gcc supports __sync_bool_compare_and_swap])
 AC_TRY_LINK(,
 [
   int variable = 1;
-  return __sync_bool_compare_and_swap(&variable, 1, 2) ? 1 : 0
+  return (__sync_bool_compare_and_swap(&variable, 1, 2)
+         && __sync_add_and_fetch(&variable, 1) ? 1 : 0
 ],
 [
   AC_MSG_RESULT([yes])