Resolve GCC's 'type-punned pointer will break strict-aliasing rules' warning by break...

[wxWidgets.git] / include / wx / beforestd.h

diff --git a/include/wx/beforestd.h b/include/wx/beforestd.h
index 945296dde1878dbcc2088fee9ab1eed5388b7d82..832a7ee4e8a13733f06c9eaf254274a4bd456a2f 100644 (file)
--- a/include/wx/beforestd.h
+++ b/include/wx/beforestd.h
@@ -23,6 +23,20 @@
 // VC 7.x isn't as bad as VC6 and doesn't give these warnings but eVC (which
 // defines _MSC_VER as 1201) does need to be included as it's VC6-like
 #if defined(__VISUALC__) && __VISUALC__ <= 1201
+    // these warning have to be disabled and not just temporarily disabled
+    // because they will be given at the end of the compilation of the
+    // current source and there is absolutely nothing we can do about them so
+    // disable them before warning(push) below
+
+    // 'foo': unreferenced inline function has been removed
+    #pragma warning(disable:4514)
+
+    // 'function' : function not inlined
+    #pragma warning(disable:4710)
+
+    // 'id': identifier was truncated to 'num' characters in the debug info
+    #pragma warning(disable:4786)
+
     // MSVC 5 does not have this
     #if __VISUALC__ > 1100
         // we have to disable (and reenable in afterstd.h) this one because,
@@ -37,6 +51,9 @@
         // 'expression' : signed/unsigned mismatch
         #pragma warning(disable:4018)
 
+        // 'identifier' : unreferenced formal parameter
+        #pragma warning(disable:4100)
+
         // 'conversion' : conversion from 'type1' to 'type2',
         // possible loss of data
         #pragma warning(disable:4244)
@@ -45,18 +62,15 @@
         // 'identifier' use the following syntax
         #pragma warning(disable:4663)
     #endif
-
-    // these warning have to be disabled and not just temporarily disabled
-    // because they will be given at the end of the compilation of the
-    // current source and there is absolutely nothing we can do about them
-
-    // 'foo': unreferenced inline function has been removed
-    #pragma warning(disable:4514)
-
-    // 'function' : function not inlined
-    #pragma warning(disable:4710)
-
-    // 'id': identifier was truncated to 'num' characters in the debug info
-    #pragma warning(disable:4786)
 #endif // VC++ < 7
 
+/**
+    GCC's visibility support is broken for libstdc++ in some older versions
+    (namely Debian/Ubuntu's GCC 4.1, see
+    https://bugs.launchpad.net/ubuntu/+source/gcc-4.1/+bug/109262). We fix it
+    here by mimicking newer versions' behaviour of using default visibility
+    for libstdc++ code.
+ */
+#if defined(HAVE_VISIBILITY) && defined(HAVE_BROKEN_LIBSTDCXX_VISIBILITY)
+    #pragma GCC visibility push(default)
+#endif