PR libstdc++/24975 (basic_string)

2005-11-23  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/24975 (basic_string)
	* include/bits/basic_string.h (_Rep::_S_empty_rep): Avoid
	strict-aliasing warnings.

From-SVN: r107447

libstdc++-v3/ChangeLog

+2005-11-23  Paolo Carlini  <pcarlini@suse.de>
+
+	PR libstdc++/24975 (basic_string)
+	* include/bits/basic_string.h (_Rep::_S_empty_rep): Avoid
+	strict-aliasing warnings.
+
 2005-11-22  Paolo Carlini  <pcarlini@suse.de>
 
 	PR libstdc++/24975

libstdc++-v3/include/bits/basic_string.h

@@ -177,7 +177,13 @@ namespace std
 
         static _Rep&
         _S_empty_rep()
-        { return *reinterpret_cast<_Rep*>(&_S_empty_rep_storage); }
+        { 
+	  // NB: Mild hack to avoid strict-aliasing warnings.  Note that
+	  // _S_empty_rep_storage is never modified and the punning should
+	  // be reasonably safe in this case.
+	  void* __p = reinterpret_cast<void*>(&_S_empty_rep_storage);
+	  return *reinterpret_cast<_Rep*>(__p);
+	}
 
         bool
 	_M_is_leaked() const