From: Brian Silverman <bsilver16384@gmail.com>
Date: Tue, 16 Jun 2015 23:50:25 +0000 (-0700)
Subject: Fix redefinition of _XOPEN_SOURCE.
X-Git-Tag: submit/tizen/20180313.064233~79^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=beb55fa825acf524fe69dd8624bc4eddda39b7e5;p=platform%2Fupstream%2Fglog.git

Fix redefinition of _XOPEN_SOURCE.

Under Debian Jessie, I get a warning about redefining _XOPEN_SOURCE
which is easy to fix.
---

diff --git a/src/base/mutex.h b/src/base/mutex.h
index 37527d5..ced2b99 100644
--- a/src/base/mutex.h
+++ b/src/base/mutex.h
@@ -134,7 +134,9 @@
   // *does* cause problems for FreeBSD, or MacOSX, but isn't needed
   // for locking there.)
 # ifdef __linux__
-#   define _XOPEN_SOURCE 500  // may be needed to get the rwlock calls
+#   ifndef _XOPEN_SOURCE  // Some other header might have already set it for us.
+#     define _XOPEN_SOURCE 500  // may be needed to get the rwlock calls
+#   endif
 # endif
 # include <pthread.h>
   typedef pthread_rwlock_t MutexType;