https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77591
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2016-09-14
Known to work| |5.4.0
Summary|decltype(auto) and ternary |[6/7 Regression]
|operator allow returning |decltype(auto) and ternary
|local reference without a |operator allow returning
|warning |local reference without a
| |warning
Ever confirmed|0 |1
Known to fail| |6.2.0, 7.0
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
That code doesn't compile, because it's incomplete.
class Counter { };
decltype(auto) foo_warn() {
Counter c;
return (c);
}
decltype(auto) foo_no_warn() {
Counter c;
return 1==1 ? c : c;
}
Additionally, the warning that's missing without -O2 says address not
reference:
f.cc: In function ‘decltype(auto) foo_no_warn()’:
f.cc:10:21: warning: function returns address of local variable
[-Wreturn-local-addr]
return 1==1 ? c : c;
^
With GCC 5 both warnings say reference and are present without optimization.
