[Bug c++/71024] Missing warning for contradictory attributes

["mpolacek at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71024

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Wed May 11 17:07:37 2016
New Revision: 236129

URL: https://gcc.gnu.org/viewcvs?rev=236129&root=gcc&view=rev
Log:
        PR c++/71024
        * c-common.c (diagnose_mismatched_attributes): New function.
        * c-common.h (diagnose_mismatched_attributes): Declare.

        * c-decl.c (diagnose_mismatched_decls): Factor out code to
        diagnose_mismatched_attributes and call it.

        * decl.c (duplicate_decls): Call diagnose_mismatched_decls.

        * c-c++-common/attributes-3.c: New test.

Added:
    trunk/gcc/testsuite/c-c++-common/attributes-3.c
Modified:
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-common.c
    trunk/gcc/c-family/c-common.h
    trunk/gcc/c/ChangeLog
    trunk/gcc/c/c-decl.c
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/decl.c
    trunk/gcc/testsuite/ChangeLog