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- # SPDX-License-Identifier: GPL-2.0
- # GCC and Clang accept backend options differently. Do not wrap in cc-option,
- # because Clang accepts "--param" even if it is unused.
- ifdef CONFIG_CC_IS_CLANG
- cc-param = -mllvm -$(1)
- else
- cc-param = --param $(1)
- endif
- # Keep most options here optional, to allow enabling more compilers if absence
- # of some options does not break KCSAN nor causes false positive reports.
- kcsan-cflags := -fsanitize=thread -fno-optimize-sibling-calls \
- $(call cc-option,$(call cc-param,tsan-compound-read-before-write=1),$(call cc-option,$(call cc-param,tsan-instrument-read-before-write=1))) \
- $(call cc-param,tsan-distinguish-volatile=1)
- ifdef CONFIG_CC_IS_GCC
- # GCC started warning about operations unsupported by the TSan runtime. But
- # KCSAN != TSan, so just ignore these warnings.
- kcsan-cflags += -Wno-tsan
- endif
- ifndef CONFIG_KCSAN_WEAK_MEMORY
- kcsan-cflags += $(call cc-option,$(call cc-param,tsan-instrument-func-entry-exit=0))
- endif
- export CFLAGS_KCSAN := $(kcsan-cflags)
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