[linux.git] / scripts / Makefile.kcsan

# 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 := $(kcsan-cflags)
Commit	Line	Data
dfd402a4	1	# SPDX-License-Identifier: GPL-2.0
17168f5c ME	2	# GCC and Clang accept backend options differently. Do not wrap in cc-option,
	3	# because Clang accepts "--param" even if it is unused.
	4	ifdef CONFIG_CC_IS_CLANG
	5	cc-param = -mllvm -$(1)
	6	else
e68dcd8e	7	cc-param = --param $(1)
17168f5c ME	8	endif
17168f5c ME	9
75d75b7a ME	10	# Keep most options here optional, to allow enabling more compilers if absence
75d75b7a ME	11	# of some options does not break KCSAN nor causes false positive reports.
69562e49	12	kcsan-cflags := -fsanitize=thread -fno-optimize-sibling-calls \
14e2ac8d	13	$(call cc-option,$(call cc-param,tsan-compound-read-before-write=1),$(call cc-option,$(call cc-param,tsan-instrument-read-before-write=1))) \
75d75b7a	14	$(call cc-param,tsan-distinguish-volatile=1)
69562e49	15
116af35e ME	16	ifdef CONFIG_CC_IS_GCC
	17	# GCC started warning about operations unsupported by the TSan runtime. But
	18	# KCSAN != TSan, so just ignore these warnings.
	19	kcsan-cflags += -Wno-tsan
	20	endif
	21
69562e49 ME	22	ifndef CONFIG_KCSAN_WEAK_MEMORY
	23	kcsan-cflags += $(call cc-option,$(call cc-param,tsan-instrument-func-entry-exit=0))
	24	endif
	25
	26	export CFLAGS_KCSAN := $(kcsan-cflags)