Cast to void* before casting to Node** to make the compiler do no strict-aliasing assumptions, and suppress a warning

if -fstrict-aliasing (enabled with -O2, -O3 and -Os unless forced off as is planned for the time being) is used.
See http://article.gmane.org/gmane.comp.lib.wxwidgets.devel/70262 for details.
Also return NULL instead of 0 in the same GetNodePtr, as the return type is a pointer, not integer.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37575 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/hashmap.h

@@ -344,10 +344,11 @@ protected: \
         { \
             if( m_equals( m_getKey( (*node)->m_value ), key ) ) \
                 return node; \
-            node = (Node**)&(*node)->m_nxt; \
+            /* Tell the compiler to not do any strict-aliasing assumptions with the void cast */ \
+            node = (Node**)(void*)&(*node)->m_nxt; \
         } \
  \
-        return 0; \
+        return NULL; \
     } \
  \
     /* returns NULL if not found */ \