| # 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) |