[Bug c/63357] Warn for P && P and P || P (same expression used multiple times in a condition)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63357

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Fri Apr 24 12:10:52 2015
New Revision: 222408

URL: https://gcc.gnu.org/viewcvs?rev=222408&root=gcc&view=rev
Log:
    PR c/63357
    * c-common.c (warn_logical_operator): Warn if the operands have the
    same expressions.

    * doc/invoke.texi: Update description of -Wlogical-op.

    * c-c++-common/Wlogical-op-1.c: New test.

Added:
    trunk/gcc/testsuite/c-c++-common/Wlogical-op-1.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-common.c
    trunk/gcc/doc/invoke.texi
    trunk/gcc/testsuite/ChangeLog