diff options
| author | Nathan Chancellor <nathan@kernel.org> | 2023-01-24 09:19:28 -0700 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2023-02-05 18:51:22 +0900 |
| commit | 4e3feaad6ff8a7a57e3bf3308a93c93e3a2e17a6 (patch) | |
| tree | 9187e93ab8dc533495f1c3011b74bd36da7d7b80 /Makefile | |
| parent | 58e0e5c85e31b0b30f16ac835d537ba0b7ff7d37 (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-- | Makefile | 4 |
1 files changed, 3 insertions, 1 deletions
@@ -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 |