[Bug libstdc++/24975] Aliasing problems inside libstdc++

[pcarlini at suse dot de]

------- Comment #17 from pcarlini at suse dot de  2005-11-22 16:14 -------
(In reply to comment #15)
> So that leaves us with basic_string and it's problems.  What do you suggest to
> vendors needing ABI compatibility?

Richard, something we *can* safely apply (safely from the ABI point of view) is
this hack (vaguely inspired by HP/SGI hacks...). I don't think it can make the
underlying issue *worse*, at least. What do you think?

Index: include/bits/basic_string.h
===================================================================
--- include/bits/basic_string.h (revision 107363)
+++ include/bits/basic_string.h (working copy)
@@ -177,7 +177,10 @@

         static _Rep&
         _S_empty_rep()
-        { return *reinterpret_cast<_Rep*>(&_S_empty_rep_storage); }
+        {
+         void* __p = reinterpret_cast<void*>(&_S_empty_rep_storage);
+         return *reinterpret_cast<_Rep*>(__p);
+       }

         bool
        _M_is_leaked() const


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24975