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[Bug c/64440] -Wdiv-by-zero false negative on const variables
- From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 06 Jan 2015 15:23:53 +0000
- Subject: [Bug c/64440] -Wdiv-by-zero false negative on const variables
- Auto-submitted: auto-generated
- References: <bug-64440-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64440
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |mpolacek at gcc dot gnu.org
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
(In reply to Manuel LÃpez-IbÃÃez from comment #3)
> (In reply to Chengnian Sun from comment #2)
> > Thanks for your reply. It seems GCC sometimes does consider "const int" for
> > other types of warnings (but not for -Wdiv-by-zero). See the following, with
> > -O3, GCC warns that the left shift count is negative.
> >
>
> I wonder how this happens? The warning is still given by the FE!
By using decl_constant_value_for_optimization.