e68dcd8eac
GCC version 11 recently implemented all requirements to correctly support KCSAN: 1. Correct no_sanitize-attribute inlining behaviour: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=4089df8ef4a63126b0774c39b6638845244c20d2 2. --param=tsan-distinguish-volatile https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=ab2789ec507a94f1a75a6534bca51c7b39037ce0 3. --param=tsan-instrument-func-entry-exit https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=06712fc68dc9843d9af7c7ac10047f49d305ad76 Therefore, we can re-enable GCC for KCSAN, and document the new compiler requirements. Signed-off-by: Marco Elver <elver@google.com> Cc: Martin Liska <mliska@suse.cz> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
20 lines
705 B
Makefile
20 lines
705 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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ifdef CONFIG_KCSAN
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# GCC and Clang accept backend options differently. Do not wrap in cc-option,
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# because Clang accepts "--param" even if it is unused.
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ifdef CONFIG_CC_IS_CLANG
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cc-param = -mllvm -$(1)
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else
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cc-param = --param $(1)
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endif
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# Keep most options here optional, to allow enabling more compilers if absence
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# of some options does not break KCSAN nor causes false positive reports.
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CFLAGS_KCSAN := -fsanitize=thread \
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$(call cc-option,$(call cc-param,tsan-instrument-func-entry-exit=0) -fno-optimize-sibling-calls) \
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$(call cc-option,$(call cc-param,tsan-instrument-read-before-write=1)) \
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$(call cc-param,tsan-distinguish-volatile=1)
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endif # CONFIG_KCSAN
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