https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90284
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-04-30
CC| |dmalcolm at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed. It's only related to C++, because for C we get:
gcc -Wunused-value pr90284.c
pr90284.c: In function ‘incorrect_warning’:
pr90284.c:3:22: warning: left-hand operand of comma expression has no effect
[-Wunused-value]
3 | return (0 ? 0 : 0, 999);
| ^
pr90284.c: In function ‘correct_warning’:
pr90284.c:8:14: warning: left-hand operand of comma expression has no effect
[-Wunused-value]
8 | return (0, 999);
| ^
So a possible enhancement.
For C++ there was improvement of the second test-case by David in r267272:
pr90284.c:8:16: warning: left operand of comma operator has no effect
[-Wunused-value]
return (0, 999);
^~~
after:
pr90284.c:8:13: warning: left operand of comma operator has no effect
[-Wunused-value]
8 | return (0, 999);
| ^
I'm leaving that to David, hopefully he can fix it.
