[Bug c++/14024] New: g++ isn't reporting aliasing warnings

["tjw at omnigroup dot com" <gcc-bugzilla at gcc dot gnu dot org>]

int test(int input)
{
    float *f = (float *)&input;
    return input;
}


When built with gcc:

$PREFIX/bin/gcc -Wstrict-aliasing -fstrict-aliasing -c alias.c
/tmp/alias.c: In function `test':
/tmp/alias.c:3: warning: dereferencing type-punned pointer will break strict-aliasing rules

But, when the same input is built with g++, no warning is issued.  This is bad since -fstrict-aliasing 
does seem to be taking effect (i.e., my real program produces crazy output with -fstrict-aliasing 
on), but no warnings are generating, meaning that it will be potentially very hard to track down the 
issue.

-- 
           Summary: g++ isn't reporting aliasing warnings
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tjw at omnigroup dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: powerpc-apple-darwin7.2.0
  GCC host triplet: powerpc-apple-darwin7.2.0
GCC target triplet: powerpc-apple-darwin7.2.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14024