[Bug preprocessor/89808] An option to disable warning "#pragma once in main file"

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89808

--- Comment #16 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Ken Matsui <kmat...@gcc.gnu.org>:

https://gcc.gnu.org/g:821d56100e1110ab6a166f50819522254eb30923

commit r15-4191-g821d56100e1110ab6a166f50819522254eb30923
Author: Ken Matsui <kmat...@gcc.gnu.org>
Date:   Fri Mar 1 22:10:55 2024 -0800

    gcc, libcpp: Add warning switch for "#pragma once in main file" [PR89808]

    This patch adds a warning switch for "#pragma once in main file".  The
    warning option name is Wpragma-once-outside-header, which is the same
    as Clang provides.

            PR preprocessor/89808

    gcc/c-family/ChangeLog:

            * c.opt (Wpragma_once_outside_header): Define new option.
            * c.opt.urls: Regenerate.

    gcc/ChangeLog:

            * doc/invoke.texi (Warning Options): Document
            -Wno-pragma-once-outside-header.

    libcpp/ChangeLog:

            * include/cpplib.h (cpp_warning_reason): Define
            CPP_W_PRAGMA_ONCE_OUTSIDE_HEADER.
            * directives.cc (do_pragma_once): Use
            CPP_W_PRAGMA_ONCE_OUTSIDE_HEADER.

    gcc/testsuite/ChangeLog:

            * g++.dg/warn/Wno-pragma-once-outside-header.C: New test.
            * g++.dg/warn/Wpragma-once-outside-header.C: New test.

    Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org>
    Reviewed-by: Marek Polacek <pola...@redhat.com>