guard gcc-specific things with Q_CC_GNU to avoid problems elsewhere

src/core/kcoreconfigskeleton.cpp

@@ -1107,10 +1107,14 @@ void KCoreConfigSkeleton::usrSetDefaults()
 
 void KCoreConfigSkeleton::usrRead()
 {
+#ifdef Q_CC_GNU
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-	usrReadConfig();
+#endif
+    usrReadConfig();
+#ifdef Q_CC_GNU
 #pragma GCC diagnostic pop
+#endif
 }
 
 void KCoreConfigSkeleton::usrReadConfig()
@@ -1119,10 +1123,14 @@ void KCoreConfigSkeleton::usrReadConfig()
 
 bool KCoreConfigSkeleton::usrSave()
 {
+#ifdef Q_CC_GNU
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
     return usrWriteConfig();
+#ifdef Q_CC_GNU
 #pragma GCC diagnostic pop
+#endif
 }
 
 bool KCoreConfigSkeleton::usrWriteConfig()