GNU Autoconf Archive branch master updated. v2015.09.25-15-ge3d948b

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- Log -----------------------------------------------------------------
commit e3d948b0303aabb8c016c7f3d7f1d538aa5472be
Author: Markus Armbruster <address@hidden>
Date:   Sun Nov 22 09:46:04 2015 +0100

    AX_APPEND_COMPILE_FLAGS, AX_APPEND_LINK_FLAGS: Optional INPUT arg
    
    Behaves exactly like the optional INPUT argument of
    AX_CHECK_COMPILE_FLAG, AX_CHECK_LINK_FLAG.
    
    Motivation: I'd like to add -fstack-protector-strong.  The obvious
    solution is AX_APPEND_COMPILE_FLAGS([-fstack-protector-strong]).
    
    Unfortunately, some ports of the GNU toolchain reportedly pass this
    test, then fail to link.  That's because the compiler accepts the
    flag, duly emits references to helper code in libc (on my system:
    ___stack_chk_guard()), but libc doesn't provide, and linking fails.
    
    The new argument lets me cover this failure mode:
    
        AX_APPEND_LINK_FLAGS([-fstack-protector-strong], [], [],
            [AC_LANG_SOURCE([[
        int
        main(int argc, char *argv[])
        {
            char arr[64], *dst = arr, *src = argv[0];
            while ((*dst++ = *src++)) ;
        }
            ]])])
    
    Signed-off-by: Markus Armbruster <address@hidden>

-----------------------------------------------------------------------

Summary of changes:
 m4/ax_append_compile_flags.m4 |    8 +++++---
 m4/ax_append_link_flags.m4    |    8 +++++---
 2 files changed, 10 insertions(+), 6 deletions(-)


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