prevent linker from discarding wxStockGDIMac

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40752 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/app.cpp

@@ -38,6 +38,7 @@
 #include "wx/tooltip.h"
 #include "wx/docview.h"
 #include "wx/filename.h"
+#include "wx/link.h"
 
 #include <string.h>
 
@@ -67,6 +68,9 @@
 #  include <Devices.h>
 #endif
 
+// Keep linker from discarding wxStockGDIMac
+wxFORCE_LINK_MODULE(gdiobj)
+
 #if wxUSE_THREADS
 extern size_t g_numberOfThreads;
 #endif

src/mac/carbon/gdiobj.cpp

@@ -18,8 +18,12 @@
 #endif
 
 #include "wx/module.h"
+#include "wx/link.h"
 #include "wx/mac/private.h"
 
+// Linker will discard entire object file without this
+wxFORCE_LINK_THIS_MODULE(gdiobj)
+
 class wxStockGDIMac: public wxStockGDI, public wxModule
 {
 public: