http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51270
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|constness violation is |missed warning about
|accepted without any |returning reference to
|warning but leads to a |temporary
|required function call |
|being eliminated during |
|optimization |
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-11-22
16:41:16 UTC ---
Very similar to my PR 49974.
Still no warning even without the (highly questionable) cast:
char const* const& faulty_compiled_function(char*& val)
{
char const* const& tmp = (const char*)val;
return tmp;
}
N.B. Clang warns for that variation (but not the others):
faulty_optimization_of_invalid_const_usage.cpp:4:10: warning: returning
reference to local temporary object [-Wreturn-stack-address]
return tmp;
^~~
faulty_optimization_of_invalid_const_usage.cpp:3:22: note: binding reference
variable 'tmp' here
char const* const& tmp = (const char*)val;
^ ~~~~~~~~~~~~~~~~
