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[Bug libstdc++/29286] [4.0/4.1/4.2/4.3 Regression] placement new does not change the dynamic type as it should
- From: "ian at airs dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 18 May 2007 06:14:53 -0000
- Subject: [Bug libstdc++/29286] [4.0/4.1/4.2/4.3 Regression] placement new does not change the dynamic type as it should
- References: <bug-29286-10053@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #78 from ian at airs dot com 2007-05-18 07:14 -------
The test case in comment #73 is just a standard aliasing violation. You are
casting a double* to an int* and writing to it both ways. As I argued in
comment #76, the only way this is going to work is if we eliminate TBAA in C++.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29286