[Bug driver/117739] `-fhardened -Wl,-z,lazy` still passes `-z now` to the linker

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117739

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-14 branch has been updated by Marek Polacek
<mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:88ca0670c79f123cc84928f78cd3d5eb46b91338

commit r14-11307-g88ca0670c79f123cc84928f78cd3d5eb46b91338
Author: Marek Polacek <polacek@redhat.com>
Date:   Tue Nov 26 14:37:21 2024 -0500

    driver: -fhardened and -z lazy/-z norelro [PR117739]

    As the manual states, using "-fhardened -fstack-protector" will produce
    a warning because -fhardened wants to enable -fstack-protector-strong,
    but it can't since it's been overriden by the weaker -fstack-protector.

    -fhardened also attempts to enable -Wl,-z,relro,-z,now.  By the same
    logic as above, "-fhardened -z norelro" or "-fhardened -z lazy" should
    produce the same warning.  But we don't detect this combination, so
    this patch fixes it.  I also renamed a variable to better reflect its
    purpose.

    Also don't check warn_hardened in process_command, since it's always
    true there.

    Also tweak wording in the manual as Jon Wakely suggested on IRC.

            PR driver/117739

    gcc/ChangeLog:

            * doc/invoke.texi: Tweak wording for -Whardened.
            * gcc.cc (driver_handle_option): If -z lazy or -z norelro was
            specified, don't enable linker hardening.
            (process_command): Don't check warn_hardened.

    gcc/testsuite/ChangeLog:

            * c-c++-common/fhardened-16.c: New test.
            * c-c++-common/fhardened-17.c: New test.
            * c-c++-common/fhardened-18.c: New test.
            * c-c++-common/fhardened-19.c: New test.
            * c-c++-common/fhardened-20.c: New test.
            * c-c++-common/fhardened-21.c: New test.

    Reviewed-by: Jakub Jelinek <jakub@redhat.com>
    (cherry picked from commit a134dcd8a010744a0097d190f73a4efc2e381531)