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[Bug middle-end/38503] [4.4 regression] warnings from -isystem headers strikes back.
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 2 Feb 2009 10:23:08 -0000
- Subject: [Bug middle-end/38503] [4.4 regression] warnings from -isystem headers strikes back.
- References: <bug-38503-7667@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #20 from rguenth at gcc dot gnu dot org 2009-02-02 10:23 -------
Same issue. Only possible fix is to not apply TBAA pruning to escaped
symbols, which will - well - basically disable TBAA. Testcase:
inline void *operator new (__SIZE_TYPE__, void *__p) throw() { return __p; }
struct Y {
Y() {}
int i;
};
struct X {
X() {}
void construct(const Y& y)
{
new (&m_data[0]) Y(y);
}
template <class T>
Y& get() { return reinterpret_cast<Y&>(m_data); }
bool initialized;
char m_data[sizeof (Y)];
};
X x;
void bar(const X&);
void foo(Y& y)
{
x.get<Y>() = y;
x.initialized = true;
bar(x);
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38503