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    Subject[PATCH v2 28/28] x86, build: allow LTO_CLANG and THINLTO to be selected
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    Allow CONFIG_LTO_CLANG and CONFIG_THINLTO to be enabled.

    Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
    ---
    arch/x86/Kconfig | 2 ++
    arch/x86/Makefile | 5 +++++
    2 files changed, 7 insertions(+)

    diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    index 6de2e5c0bdba..0a49008c2363 100644
    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -92,6 +92,8 @@ config X86
    select ARCH_SUPPORTS_ACPI
    select ARCH_SUPPORTS_ATOMIC_RMW
    select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
    + select ARCH_SUPPORTS_LTO_CLANG if X86_64
    + select ARCH_SUPPORTS_THINLTO if X86_64
    select ARCH_USE_BUILTIN_BSWAP
    select ARCH_USE_QUEUED_RWLOCKS
    select ARCH_USE_QUEUED_SPINLOCKS
    diff --git a/arch/x86/Makefile b/arch/x86/Makefile
    index 4346ffb2e39f..49e3b8674eb5 100644
    --- a/arch/x86/Makefile
    +++ b/arch/x86/Makefile
    @@ -173,6 +173,11 @@ ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
    KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
    endif

    +ifdef CONFIG_LTO_CLANG
    +KBUILD_LDFLAGS += -plugin-opt=-code-model=kernel \
    + -plugin-opt=-stack-alignment=$(if $(CONFIG_X86_32),4,8)
    +endif
    +
    # Workaround for a gcc prelease that unfortunately was shipped in a suse release
    KBUILD_CFLAGS += -Wno-sign-compare
    #
    --
    2.28.0.402.g5ffc5be6b7-goog
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