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H A D | Makefile | 2b8689520520175075ca97bc4eaf51ff3f7253aa Thu Jan 21 12:45:55 CST 2021 Alexander Lobakin <alobakin@pm.me> kbuild: prevent CC_FLAGS_LTO self-bloating on recursive rebuilds
CC_FLAGS_LTO gets initialized only via +=, never with := or =. When building with CONFIG_TRIM_UNUSED_KSYMS, Kbuild may perform several kernel rebuilds to satisfy symbol dependencies. In this case, value of CC_FLAGS_LTO is concatenated each time, which triggers a full rebuild. Initialize it with := to fix this.
Fixes: dc5723b02e52 ("kbuild: add support for Clang LTO") Signed-off-by: Alexander Lobakin <alobakin@pm.me> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20210121184544.659998-1-alobakin@pm.me
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