[Bug fortran/55534] -Wno-missing-include-dirs does not work with gfortran

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55534

--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tobias Burnus <burnus@gcc.gnu.org>:

https://gcc.gnu.org/g:83aac698835edcdb3e6d96b856bef1c5f92e5e24

commit r12-3825-g83aac698835edcdb3e6d96b856bef1c5f92e5e24
Author: Tobias Burnus <tobias@codesourcery.com>
Date:   Wed Sep 22 20:58:35 2021 +0200

    Fortran: Improve -Wmissing-include-dirs warnings [PR55534]

    It turned out that enabling the -Wmissing-include-dirs for libcpp did
output
    too many warnings â at least as run with -B and similar options during
the
    GCC build and warning for internal include dirs like finclude, unlikely of
    relevance to for a real-world user.
    This patch now only warns for -I and -J by default but permits to get the
    full warnings including libcpp ones with -Wmissing-include-dirs. It
    additionally documents this in the manual.

    With that change, the -Wno-missing-include-dirs could be removed
    from libgfortran's configure and libgomp's testsuite always cflags.
    This reverts those bits of the previous
    commit r12-3722-g417ea5c02cef7f000e66d1af22b066c2c1cda047

    Additionally, it turned out that all call to load_file called exit
    explicitly - except for the main file via gfc_init -> gfc_new_file. The
    latter also output a file not existing fatal error, such that two errors
    where printed. Now exit is called in line with the other users of
    load_file.

    Finally, when compileing with "nonexisting/file.f90", first a warning that
    "nonexisting" does not exist as include path was printed before the file
    not found error was printed. Now the directory in which the physical file
    is located is added silently, relying on the file-not-found diagnostic for
    those.

            PR fortran/55534
    gcc/ChangeLog:

            * doc/invoke.texi (-Wno-missing-include-dirs.): Document Fortran
            behavior.

    gcc/fortran/ChangeLog:

            * cpp.c (gfc_cpp_register_include_paths, gfc_cpp_post_options):
            Add new bool verbose_missing_dir_warn argument.
            * cpp.h (gfc_cpp_post_options): Update prototype.
            * f95-lang.c (gfc_init): Remove duplicated file-not found diag.
            * gfortran.h (gfc_check_include_dirs): Takes bool
            verbose_missing_dir_warn arg.
            (gfc_new_file): Returns now void.
            * options.c (gfc_post_options): Update to warn for -I and -J,
            only, by default but for all when user requested.
            * scanner.c (gfc_do_check_include_dir):
            (gfc_do_check_include_dirs, gfc_check_include_dirs): Take bool
            verbose warn arg and update to avoid printing the same message
            twice or never.
            (load_file): Fix indent.
            (gfc_new_file): Return void and exit when load_file failed
            as all other load_file users do.

    libgfortran/ChangeLog:

            * configure.ac (AM_FCFLAGS): Revert r12-3722 by removing
            -Wno-missing-include-dirs.
            * configure: Regenerate.

    libgomp/ChangeLog:

            * testsuite/libgomp.fortran/fortran.exp (ALWAYS_CFLAGS): Revert
            r12-3722 by removing -Wno-missing-include-dirs.
            * testsuite/libgomp.oacc-fortran/fortran.exp (ALWAYS_CFLAGS):
Likewise.

    gcc/testsuite/ChangeLog:

            * gfortran.dg/include_14.f90: Add -J testcase and update dg-output.
            * gfortran.dg/include_15.f90: Likewise.
            * gfortran.dg/include_16.f90: Likewise.
            * gfortran.dg/include_17.f90: Likewise.
            * gfortran.dg/include_18.f90: Likewise.
            * gfortran.dg/include_19.f90: Likewise.