[glib] gmain: Define _GNU_SOURCE before including glibconfig.h

[Emmanuele Bassi <ebassi src gnome org>]

commit 581e68b7d3f57654d881cea6de7bdfabae62e368
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Sat Sep 4 18:15:15 2010 +0100

    gmain: Define _GNU_SOURCE before including glibconfig.h
    
    As it pulls in unistd.h from something else.

 glib/gmain.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/glib/gmain.c b/glib/gmain.c
index 933c04f..78de717 100644
--- a/glib/gmain.c
+++ b/glib/gmain.c
@@ -31,6 +31,11 @@
  * MT safe
  */
 
+/* for pipe2; need to define it first to avoid
+ * other headers pulling in unistd.h
+ */
+#define _GNU_SOURCE
+
 #include "config.h"
 #include "glibconfig.h"
 
@@ -47,8 +52,6 @@
 #define G_MAIN_POLL_DEBUG
 #endif
 
-#define _GNU_SOURCE  /* for pipe2 */
-
 #include <signal.h>
 #include <sys/types.h>
 #include <time.h>