From f6f5f2443acc1f0c64fde7d62256cc8152a12cc4 Mon Sep 17 00:00:00 2001
From: Samuel Chou <schou@barracuda.com>
Date: Mon, 9 Dec 2013 10:18:36 -0800
Subject: [PATCH] Improve accuracy of HAVE_ATOMIC dependency check

[I had to split out the clang check due to
 clang *really* not liking the __GLIBC_PREREQ macro; -matt]

Closes #1456
---
 src/config.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/config.h b/src/config.h
index 1bc70a13e..57d07599a 100644
--- a/src/config.h
+++ b/src/config.h
@@ -187,9 +187,14 @@ void setproctitle(const char *fmt, ...);
 
 #if (__i386 || __amd64 || __powerpc__) && __GNUC__
 #define GNUC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
-#if (GNUC_VERSION >= 40100) || defined(__clang__)
+#if defined(__clang__)
 #define HAVE_ATOMIC
 #endif
+#if (defined(__GLIBC__) && defined(__GLIBC_PREREQ))
+#if (GNUC_VERSION >= 40100 && __GLIBC_PREREQ(2, 6))
+#define HAVE_ATOMIC
+#endif
+#endif
 #endif
 
 #endif