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UPSTREAM: hardening: Remove Clang's enable flag for -ftrivial-auto-var-init=zero

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Now that Clang's -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
option is no longer required, remove it from the command line. Clang 16
and later will warn when it is used, which will cause Kconfig to think
it can't use -ftrivial-auto-var-init=zero at all. Check for whether it
is required and only use it when so.

Cc: Nathan Chancellor <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Fixes: f02003c860d9 ("hardening: Avoid harmless Clang option under CONFIG_INIT_STACK_ALL_ZERO")
Signed-off-by: Kees Cook <[email protected]>
(cherry picked from commit 607e57c6c62c00965ae276902c166834ce73014a)
Change-Id: I30ecd0e5226852b7d5ee12c44c346ac79051a671
Signed-off-by: Nathan Chancellor <[email protected]>
This commit is contained in:
Kees Cook 2022-09-29 22:57:43 -07:00 • committed by Nick Desaulniers
commit 0d4d3b41a5
2 changed files with 12 additions and 6 deletions
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4
Makefile
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@ -811,8 +811,8 @@ endif
# Initialize all stack variables with a zero value.
ifdef CONFIG_INIT_STACK_ALL_ZERO
KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
ifdef CONFIG_CC_IS_CLANG
# https://bugs.llvm.org/show_bug.cgi?id=45497
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
endif
endif