[Bug c++/62153] warn for bool expression compared with integer different from 0/1

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62153

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Aug 19 18:50:00 2014
New Revision: 214183

URL: https://gcc.gnu.org/viewcvs?rev=214183&root=gcc&view=rev
Log:
    PR c++/62153
    * doc/invoke.texi: Document -Wbool-compare.
c-family/
    * c-common.c (maybe_warn_bool_compare): New function.
    * c-common.h (maybe_warn_bool_compare): Declare.
    * c.opt (Wbool-compare): New option.
c/
    * c-typeck.c (build_binary_op): If either operand of a comparison
    is a boolean expression, call maybe_warn_bool_compare.
cp/
    * call.c (build_new_op_1): Remember the type of arguments for
    a comparison.  If either operand of a comparison is a boolean
    expression, call maybe_warn_bool_compare.
testsuite/
    * c-c++-common/Wbool-compare-1.c: New test.

Added:
    trunk/gcc/testsuite/c-c++-common/Wbool-compare-1.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-common.c
    trunk/gcc/c-family/c-common.h
    trunk/gcc/c-family/c.opt
    trunk/gcc/c/ChangeLog
    trunk/gcc/c/c-typeck.c
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/call.c
    trunk/gcc/doc/invoke.texi
    trunk/gcc/testsuite/ChangeLog