Merge tag 'spdx-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[platform/kernel/linux-starfive.git] / scripts / Makefile.kcsan
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)
6 else
7 cc-param = --param $(1)
8 endif
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.
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)
15
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
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)