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    Subject[PATCH 21/21] x86: Enable Link Time Optimization
    Date
    From: Andi Kleen <ak@linux.intel.com>

    LTO is opt-in per architecture because it usually needs some
    fixes.

    LTO needs THIN_ARCHIVES because standard binutils doesn't like mixing
    assembler and LTO code with ld -r.

    Enable LTO and THIN_ARCHIVES for x86

    Signed-off-by: Andi Kleen <ak@linux.intel.com>
    ---
    arch/x86/Kconfig | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    index 8eed3f94bfc7..92650726f908 100644
    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -122,6 +122,8 @@ config X86
    select HAVE_ARCH_VMAP_STACK if X86_64
    select HAVE_ARCH_WITHIN_STACK_FRAMES
    select HAVE_CC_STACKPROTECTOR
    + select THIN_ARCHIVES if LTO
    + select ARCH_SUPPORTS_LTO
    select HAVE_CMPXCHG_DOUBLE
    select HAVE_CMPXCHG_LOCAL
    select HAVE_CONTEXT_TRACKING if X86_64
    --
    2.13.6
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