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 López-Ibáñez 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.
