[Bug c/64440] -Wdiv-by-zero false negative on const variables

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64440

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Wed Jan  7 08:21:50 2015
New Revision: 219279

URL: https://gcc.gnu.org/viewcvs?rev=219279&root=gcc&view=rev
Log:
    PR c/64440
    * c-common.c (c_fully_fold_internal): Warn for division and modulo
    if orig_op1 isn't INTEGER_CST, op1 is INTEGER_CST and is zero.

    * gcc.dg/pr64440.c: New test.
    * c-c++-common/pr56607.c: Don't limit dg-warnings to C++.

Added:
    trunk/gcc/testsuite/gcc.dg/pr64440.c
Modified:
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-common.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/c-c++-common/pr56607.c