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. 4ifdef CONFIG_CC_IS_CLANG 5cc-param = -mllvm -$(1) 6else 7cc-param = --param $(1) 8endif 9 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. 12kcsan-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) 15 16ifdef CONFIG_CC_IS_GCC 17# GCC started warning about operations unsupported by the TSan runtime. But 18# KCSAN != TSan, so just ignore these warnings. 19kcsan-cflags += -Wno-tsan 20endif 21 22ifndef CONFIG_KCSAN_WEAK_MEMORY 23kcsan-cflags += $(call cc-option,$(call cc-param,tsan-instrument-func-entry-exit=0)) 24endif 25 26export CFLAGS_KCSAN := $(kcsan-cflags) 27