git: gcc47, gcc80: Define LINK_SSP_SPEC to link with libssp_nonshared.a

[Aaron LI]

commit 6bf6d109a5126fea31487a000025d5f2a530d6d5
Author: Aaron LI <aly at aaronly.me>
Date:   Fri Mar 6 11:10:54 2026 +0800

    gcc47,gcc80: Define LINK_SSP_SPEC to link with libssp_nonshared.a
    
    libssp_nonshared.a provides '__stack_chk_fail_local()' as a hidden
    symbol to avoids PLT overhead on 32-bit x86 by deferring PIC register
    setup to the cold failure path.  Although our libc.a (static) also
    provides the '__stack_chk_fail_local()', it cannot be used when the
    program is dynamically linked.
    
    Note that on x86-64, GCC calls '__stack_chk_fail()' directly because
    RIP-relative addressing makes PLT efficient, but we link
    libssp_nonshared.a for consistency with other systems as well as for
    future-proof.
    
    One more thing, the 'TARGET_LIBC_PROVIDES_SSP' macro is undefined in GCC
    4.7's 'auto-host.h' but defined to be 1 in GCC 8.0's.  However, this
    difference is ignored when 'LINK_SSP_SPEC' is explicitly defined.

Summary of changes:
 gnu/usr.bin/cc47/cc_prep/config/dragonfly-native.h | 16 ++++++++++++++++
 gnu/usr.bin/cc80/cc_prep/config/dragonfly-native.h | 16 ++++++++++++++++
 2 files changed, 32 insertions(+)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/6bf6d109a5126fea31487a000025d5f2a530d6d5


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