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