[Bug c/81783] -Wtautological-compare could do better

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81783

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Mon Sep  4 14:05:01 2017
New Revision: 251660

URL: https://gcc.gnu.org/viewcvs?rev=251660&root=gcc&view=rev
Log:
        PR c/81783
        * c-warn.c (warn_tautological_bitwise_comparison): New function.
        (warn_tautological_cmp): Call it.

        * doc/invoke.texi: Update -Wtautological-compare documentation.

        * c-c++-common/Wtautological-compare-5.c: New test.

Added:
    trunk/gcc/testsuite/c-c++-common/Wtautological-compare-5.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-warn.c
    trunk/gcc/doc/invoke.texi
    trunk/gcc/testsuite/ChangeLog