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x86/build: Remove cc-option for GCC retpoline flags

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The minimum supported version of GCC to build the x86 kernel was bumped
to GCC 8.1 in

  a3e8fe814a ("x86/build: Raise the minimum GCC version to 8.1").

'-mindirect-branch' and '-mindirect-branch-register' were first supported in
GCC 8.1, so there is no need to call cc-option to inquire if it is supported.

Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=da99fd4a3ca06b43b08ba8d96dab84e83ac90aa7
Link: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=d543c04b795f8af4ebe5b3d5f38156ef4e5734f1
Link: https://lore.kernel.org/20250814-x86-min-ver-cleanups-v1-1-ff7f19457523@kernel.org
This commit is contained in:
Nathan Chancellor
2025-08-14 18:31:37 -07:00
committed by Borislav Petkov (AMD)
parent 8f5ae30d69
commit 5d6d30eca4
1 changed files with 2 additions and 2 deletions
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4
arch/x86/Makefile
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@@ -13,8 +13,8 @@ else
endif
ifdef CONFIG_CC_IS_GCC
RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register)
RETPOLINE_CFLAGS := -mindirect-branch=thunk-extern -mindirect-branch-register
RETPOLINE_VDSO_CFLAGS := -mindirect-branch=thunk-inline -mindirect-branch-register
endif
ifdef CONFIG_CC_IS_CLANG
RETPOLINE_CFLAGS := -mretpoline-external-thunk