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kbuild: add -fcf-protection=none when using retpoline flags
[ Upstream commit 29be86d7f9
]
The gcc -fcf-protection=branch option is not compatible with
-mindirect-branch=thunk-extern. The latter is used when
CONFIG_RETPOLINE is selected, and this will fail to build with
a gcc which has -fcf-protection=branch enabled by default. Adding
-fcf-protection=none when building with retpoline enabled
prevents such build failures.
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 6 additions and 0 deletions
6
Makefile
6
Makefile
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@ -843,6 +843,12 @@ KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
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# change __FILE__ to the relative path from the srctree
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KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
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# ensure -fcf-protection is disabled when using retpoline as it is
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# incompatible with -mindirect-branch=thunk-extern
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ifdef CONFIG_RETPOLINE
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KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
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endif
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# use the deterministic mode of AR if available
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KBUILD_ARFLAGS := $(call ar-option,D)
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