From: Amos Jeffries <squid3@treenet.co.nz>
Date: Sun, 8 Sep 2013 22:05:21 +0000 (-0600)
Subject: Windows: fix detection of GNU atomic operations
X-Git-Tag: SQUID_3_3_10~46
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=75bece468f15d779d617fc9f00658986f78284c5;p=thirdparty%2Fsquid.git

Windows: fix detection of GNU atomic operations

On MinGW the GNU atomic operations symbols are defined but do not work.
We require a run-time test to detect problems. Not just a compiler check.
---

diff --git a/configure.ac b/configure.ac
index 53888095aa..1746b1fb98 100644
--- a/configure.ac
+++ b/configure.ac
@@ -391,8 +391,8 @@ export enable_inline
 dnl
 dnl Check for atomic operations support in the compiler
 dnl
-AC_MSG_CHECKING([for atomic operations support])
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+AC_MSG_CHECKING([for GNU atomic operations support])
+AC_RUN_IFELSE([AC_LANG_PROGRAM([[
     int n = 0;
 ]],[[
     __sync_add_and_fetch(&n, 10); // n becomes 10
@@ -403,8 +403,7 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
     return (n == 200) ? 0 : -1;
 ]])],
 [
-    AC_DEFINE(HAVE_ATOMIC_OPS,1,
-        [Define to 1 if you have __sync_add_and_fetch() and such])
+    AC_DEFINE(HAVE_ATOMIC_OPS,1,[Define to 1 if you have __sync_add_and_fetch() and such])
     AC_MSG_RESULT(yes)
 ],[
     AC_MSG_RESULT(no)