1 # SPDX-License-Identifier: GPL-2.0
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)
7 cc-param = --param $(1)
10 # Keep most options here optional, to allow enabling more compilers if absence
11 # of some options does not break KCSAN nor causes false positive reports.
12 kcsan-cflags := -fsanitize=thread -fno-optimize-sibling-calls \
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))) \
14 $(call cc-param,tsan-distinguish-volatile=1)
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
22 ifndef CONFIG_KCSAN_WEAK_MEMORY
23 kcsan-cflags += $(call cc-option,$(call cc-param,tsan-instrument-func-entry-exit=0))
26 export CFLAGS_KCSAN := $(kcsan-cflags)