Fix broken build with -Wundefined

diff --git a/glib/gmacros.h b/glib/gmacros.h
index 4fc20bf36e3cfc9bac0e82b71b0f8b302c5958d6..accd55ab4f2bfe6bdd68feab9ae9d4cc21682fa6 100644 (file)
--- a/glib/gmacros.h
+++ b/glib/gmacros.h
@@ -343,7 +343,7 @@
 #define G_DEFINE_CONSTRUCTOR(_func) static void __attribute__((constructor)) _func (void);
 #define G_DEFINE_DESTRUCTOR(_func) static void __attribute__((destructor)) _func (void);
 
-#elif _MSC_VER >= 1500
+#elif defined (_MSC_VER) && (_MSC_VER >= 1500)
 /* Visual studio 2008 and later has _Pragma */
 
 #define G_HAS_CONSTRUCTORS 1