https://gcc.gnu.org/bugzilla/show_bug.cgi?id=30475
Harald van Dijk <harald at gigawatt dot nl> changed:
What |Removed |Added
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CC| |harald at gigawatt dot nl
--- Comment #60 from Harald van Dijk <harald at gigawatt dot nl> ---
(In reply to Marian from comment #59)
> Thanks for the fast replay
>
> wget http://ptrace.fefe.de/int.c
> gcc -Wstrict-overflow=1 -Wall -Wextra -pedantic -o int int.c
>
> does not produce a warning (except for the missing `#include <stdio.h>`) on
> gcc 8.2.0 on Alpine Linux for me, nor on GCC 8.2.1 20181127 an Arch Linux.
It warned at -O2 -Wall with GCC 4.2 to 7 (-O2 enabling -fstrict-overflow), but
stopped warning in GCC 8. Warnings no longer being emitted in cases where they
are desired is part of bug 80511.
The GCC 8 Changes page[*] says -Wstrict-overflow is deprecated (even if it is
supposed to still work) and recommends to use
-fsanitize=signed-integer-overflow to get a run-time warning, which does catch
this.
[*] https://gcc.gnu.org/gcc-8/changes.html
