https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70800
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
CC| |egallager at gcc dot gnu.org,
| |mpolacek at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=71852
Summary|libgcc/config/libbid/bid_bi |libgcc/config/libbid/bid_bi
|narydecimal.c: suspicious |narydecimal.c: suspicious
|comparison ? |comparison ? (missed
| |-Wtautological-compare)
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to David Binderman from comment #3)
> I just discovered that clang++ can be made to find this bug by
> adding flag -Wtautological-compare.
>
> jan22a.cc:6:17: warning: bitwise comparison always
> evaluates to false [-Wtautological-compare]
> if ((n & 0x30) == 1)
> ~~~~~~~~~~~^~~~
I think Marek enhanced -Wtautological-compare to catch cases like this, in
which case bug 71852 is related
