* #5949: test gcc version before disabling unused-but-set warning

sflphone-common/src/dbus/callmanager.h

@@ -31,9 +31,13 @@
 #ifndef __SFL_CALLMANAGER_H__
 #define __SFL_CALLMANAGER_H__
 
+#if __GNUC__ >= 4 && __GNUC_MINOR__ >= 6
+/* This warning option only exists for gcc 4.6.0 and greater. */
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#endif
+
 #pragma GCC diagnostic ignored "-Wignored-qualifiers"
 #pragma GCC diagnostic ignored "-Wunused-parameter"
-#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #include "callmanager-glue.h"
 #pragma GCC diagnostic warning "-Wignored-qualifiers"
 #pragma GCC diagnostic warning "-Wunused-parameter"