macOS: silence warning in non-ARC build

see f1aa3c1c9a

include/wx/osx/core/cfref.h

@@ -21,6 +21,14 @@
 // Include AvailabilityMacros for DEPRECATED_ATTRIBUTE
 #include <AvailabilityMacros.h>
 
+#if __has_feature(objc_arc)
+#define WX_OSX_BRIDGE_RETAINED __bridge_retained
+#define WX_OSX_BRIDGE __bridge
+#else
+#define WX_OSX_BRIDGE_RETAINED
+#define WX_OSX_BRIDGE 
+#endif
+
 // #include <CoreFoundation/CFBase.h>
 /* Don't include CFBase.h such that this header can be included from public
  * headers with minimal namespace pollution.

include/wx/osx/core/cfstring.h

@@ -43,7 +43,7 @@ public:
 
 #ifdef __OBJC__
     wxCFStringRef(WX_NSString ref)
-        : wxCFRef< CFStringRef >((__bridge_retained CFStringRef) ref)
+        : wxCFRef< CFStringRef >((WX_OSX_BRIDGE_RETAINED CFStringRef) ref)
     {
     }
 #endif
@@ -71,7 +71,7 @@ public:
     static wxString AsStringWithNormalizationFormC( WX_NSString ref, wxFontEncoding encoding = wxFONTENCODING_DEFAULT ) ;
 #endif
 #ifdef __OBJC__
-    WX_NSString AsNSString() const { return (__bridge WX_NSString)(CFStringRef) *this; }
+    WX_NSString AsNSString() const { return (WX_OSX_BRIDGE WX_NSString)(CFStringRef) *this; }
 #endif
 private:
 } ;