[Bug c/55976] -Werror=return-type should error on returning a value from a void function

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55976

--- Comment #11 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed May 30 22:55:38 2018
New Revision: 260978

URL: https://gcc.gnu.org/viewcvs?rev=260978&root=gcc&view=rev
Log:
2018-05-30  David Pagan  <dave.pa...@oracle.com>

        PR c/55976
        * c-decl.c (grokdeclarator): Update check for return type warnings.
        (start_function): Likewise.
        (finish_function): Likewise.
        * c-typeck.c (c_finish_return): Update check for return type warnings.
        Pass OPT_Wreturn_type to pedwarn when appropriate.

        PR c/55976
        * c-opts.c (c_common_post_options): Set default for warn_return_type
        for C++/C++ with ObjC extensions only. For C, makes it possible to
        differentiate between default (no option), -Wreturn-type, and
        -Wno-return-type.

        PR c/55976
        * gcc.dg/noncompile/pr55976-1.c: New test.
        * gcc.dg/noncompile/pr55976-2.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/noncompile/pr55976-1.c
    trunk/gcc/testsuite/gcc.dg/noncompile/pr55976-2.c
Modified:
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-opts.c
    trunk/gcc/c/ChangeLog
    trunk/gcc/c/c-decl.c
    trunk/gcc/c/c-typeck.c
    trunk/gcc/testsuite/ChangeLog