android/android_kernel_xiaomi_sm8450
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FROMLIST: x86, build: allow LTO to be selected

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Pass code model and stack alignment to the linker as these are not
stored in LLVM bitcode, and allow CONFIG_LTO_CLANG* to be enabled.

Bug: 145210207
Change-Id: I50055b0be4fdf9f93b770d8b651f8c54dbda584e
Link: https://lore.kernel.org/lkml/20201013003203.4168817-26-samitolvanen@google.com/
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Sami Tolvanen 2019-04-10 14:17:20 -07:00
parent 5fbc1d78a4
commit bb613f1c20
2 changed files with 7 additions and 0 deletions
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2
arch/x86/Kconfig
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@ -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_LTO_CLANG_THIN if X86_64
select ARCH_USE_BUILTIN_BSWAP
select ARCH_USE_QUEUED_RWLOCKS
select ARCH_USE_QUEUED_SPINLOCKS

5
arch/x86/Makefile
View File

@ -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
#