Reenable -Wstrict-prototypes

One part of this patch reverts commit 22bc9a46, which disabled the
warning. The rest of it deals with the warning by adding a #pragma for
newer gcc and by disabling -Werror for compilers that can't deal with
the #pragma.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 1361563731-13307-1-git-send-email-kwolf@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/ui/gtk.c b/ui/gtk.c
index 5f91de4..008a6f8 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -34,7 +34,18 @@
 #define GETTEXT_PACKAGE "qemu"
 #define LOCALEDIR "po"
 
+#include "qemu-common.h"
+
+#ifdef CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE
+/* Work around an -Wstrict-prototypes warning in GTK headers */
+#pragma GCC diagnostic ignored "-Wstrict-prototypes"
+#endif
 #include <gtk/gtk.h>
+#ifdef CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE
+#pragma GCC diagnostic error "-Wstrict-prototypes"
+#endif
+
+
 #include <gdk/gdkkeysyms.h>
 #include <glib/gi18n.h>
 #include <locale.h>
@@ -46,7 +57,6 @@
 #include <pty.h>
 #include <math.h>
 
-#include "qemu-common.h"
 #include "ui/console.h"
 #include "sysemu/sysemu.h"
 #include "qmp-commands.h"