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authorNathan Chancellor <nathan@kernel.org>2023-01-24 09:19:28 -0700
committerMasahiro Yamada <masahiroy@kernel.org>2023-02-05 18:51:22 +0900
commit4e3feaad6ff8a7a57e3bf3308a93c93e3a2e17a6 (patch)
tree9187e93ab8dc533495f1c3011b74bd36da7d7b80 /Makefile
parent58e0e5c85e31b0b30f16ac835d537ba0b7ff7d37 (diff)
powerpc/vdso: Filter clang's auto var init zero enabler when linking
After commit 8d9acfce3332 ("kbuild: Stop using '-Qunused-arguments' with clang"), the PowerPC vDSO shows the following error with clang-13 and older when CONFIG_INIT_STACK_ALL_ZERO is enabled: clang: error: argument unused during compilation: '-enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang' [-Werror,-Wunused-command-line-argument] clang-14 added a change to make sure this flag never triggers -Wunused-command-line-argument, so it is fixed with newer releases. For older releases that the kernel still supports building with, just filter out this flag, as has been done for other flags. Fixes: f0a42fbab447 ("powerpc/vdso: Improve linker flags") Fixes: 8d9acfce3332 ("kbuild: Stop using '-Qunused-arguments' with clang") Link: https://github.com/llvm/llvm-project/commit/ca6d5813d17598cd180995fb3bdfca00f364475f Signed-off-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile4
1 files changed, 3 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 3e7f96f12f08..5bd587bb30b5 100644
--- a/Makefile
+++ b/Makefile
@@ -912,7 +912,9 @@ ifdef CONFIG_INIT_STACK_ALL_ZERO
KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
# https://github.com/llvm/llvm-project/issues/44842
-KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
+CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
+export CC_AUTO_VAR_INIT_ZERO_ENABLER
+KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
endif
endif