[Bug c/96284] Outdated C features should be made errors with newer standards

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96284

--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Florian Weimer <fw@gcc.gnu.org>:

https://gcc.gnu.org/g:4ecfa6c4a9df19b364cbdf6d9de5f0b98c22bd8f

commit r14-6036-g4ecfa6c4a9df19b364cbdf6d9de5f0b98c22bd8f
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Dec 1 08:10:13 2023 +0100

    c: Turn -Wreturn-mismatch into a permerror

    gcc/

            * doc/invoke.texi (Warning Options): Document that
            -Wreturn-mismatch is a permerror in C99 and later.

    gcc/c/

            PR c/96284
            * c-typeck.cc (c_finish_return): Use permerrors
            for OPT_Wreturn_mismatch diagnostics.

    gcc/testsuite/

            * gcc.dg/permerror-default.c (return_mismatch_1)
            (return_mismatch_2): Expect new permerror.
            * gcc.dg/permerror-gnu89-nopermissive.c (return_mismatch_1):
            Likewise.
            * gcc.dg/permerror-system.c: Likewise.
            * gcc.dg/20030906-1.c: Compile with -fpermissive due to
            expected -Wreturn-mismatch error.
            * gcc.dg/20030906-1a.c: New test.  Copied from
            gcc.dg/20030906-1.c.  Expect the error.
            * gcc.dg/20030906-2.c: Compile with -fpermissive due to
            expected -Wreturn-mismatch error.
            * gcc.dg/20030906-2a.c: New test.  Copied from
            gcc.dg/20030906-2.c.  Expect the error.
            * gcc.dg/Wreturn-mismatch-1.c: Compile with -fpermissive due to
            expected -Wreturn-mismatch error.
            * gcc.dg/Wreturn-mismatch-1a.c: New test.  Copied from
            gcc.dg/Wreturn-mismatch-1.c.  Expect the error.
            * gcc.dg/Wreturn-mismatch-2.c: Compile with -fpermissive due to
            expected -Wreturn-mismatch error.
            * gcc.dg/Wreturn-mismatch-2a.c: New test.  Copied from
            gcc.dg/Wreturn-mismatch-2.c.  Expect the error.
            * gcc.dg/diagnostic-range-bad-return.c: Compile with
            -fpermissive due to expected -Wreturn-mismatch error.
            * gcc.dg/diagnostic-range-bad-return-2.c: New test.
            Copied from gcc.dg/diagnostic-range-bad-return.c.  Expect the
            error.
            * gcc.dg/pr105635-2.c: Expect -Wreturn-mismatch error.
            * gcc.dg/pr23075.c: Build with -fpermissive due to
            expected -Wreturn-mismatch error.
            * gcc.dg/pr23075-2.c: New test.  Copied from gcc.dg/pr23075.c.
            Expect the error.
            * gcc.dg/pr29521.c: Compile with -fpermissive due to expected
            -Wreturn-mismatch error.
            * gcc.dg/pr29521-a.c: New test. Copied from gcc.dg/pr29521.c.
            Expect error.
            * gcc.dg/pr67730.c: Compile with -fpermissive due to expected
            -Wreturn-mismatch error.
            * gcc.dg/pr67730-a.c: New test.  Copied from
            gcc.dg/pr67730-a.c.  Expect error.
            * gcc.target/powerpc/conditional-return.c: Compile with
            -fpermissive due to expected -Wreturn-mismatch error.