[Bug target/85644] [8 Regression] -fstack-protector generates invalid read to %fs:0x0 on mac

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85644

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Jan  8 09:56:36 2019
New Revision: 267686

URL: https://gcc.gnu.org/viewcvs?rev=267686&root=gcc&view=rev
Log:
        Backported from mainline
        2018-11-22  Jakub Jelinek  <jakub@redhat.com>

        PR target/85644
        PR target/86832
        * config/i386/i386.c (ix86_option_override_internal): Default
        ix86_stack_protector_guard to SSP_TLS only if TARGET_THREAD_SSP_OFFSET
        is defined.
        * config/i386/i386.md (stack_protect_set, stack_protect_set_<mode>,
        stack_protect_test, stack_protect_test_<mode>): Use empty condition
        instead of TARGET_SSP_TLS_GUARD.

Modified:
    branches/gcc-8-branch/gcc/ChangeLog
    branches/gcc-8-branch/gcc/config/i386/i386.c
    branches/gcc-8-branch/gcc/config/i386/i386.md