path: root/scripts/Makefile.kcsan
diff options
authorMasahiro Yamada <>2020-09-10 22:44:29 +0900
committerMasahiro Yamada <>2020-09-25 00:36:50 +0900
commitbb2732112bc52bed7b20b9fc59d7246e4e7ce5ed (patch)
tree82ed0d438c401b482494e4b84457c714f27d7cc6 /scripts/Makefile.kcsan
parent9909b7681222299dcb6f3b0613c30a65498b6c72 (diff)
kbuild: move CFLAGS_{KASAN,UBSAN,KCSAN} exports to relevant Makefiles
Move CFLAGS_KASAN*, CFLAGS_UBSAN, CFLAGS_KCSAN to Makefile.kasan, Makefile.ubsan, Makefile.kcsan, respectively. This commit also avoids the same -fsanitize=* flags being added to CFLAGS_UBSAN multiple times. Prior to this commit, the ubsan flags were appended by the '+=' operator, without any initialization. Some build targets such as 'make bindeb-pkg' recurses to the top Makefile, and ended up with adding the same flags to CFLAGS_UBSAN twice. Clear CFLAGS_UBSAN with ':=' to make it a simply expanded variable. This is better than a recursively expanded variable, which evaluates $(call cc-option, ...) multiple times before Kbuild starts descending to subdirectories. Signed-off-by: Masahiro Yamada <> Acked-by: Marco Elver <>
Diffstat (limited to 'scripts/Makefile.kcsan')
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/Makefile.kcsan b/scripts/Makefile.kcsan
index c50f27b3ac56..cec50d74e0d0 100644
--- a/scripts/Makefile.kcsan
+++ b/scripts/Makefile.kcsan
@@ -9,7 +9,7 @@ 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.
-CFLAGS_KCSAN := -fsanitize=thread \
+export CFLAGS_KCSAN := -fsanitize=thread \
$(call cc-option,$(call cc-param,tsan-instrument-func-entry-exit=0) -fno-optimize-sibling-calls) \
$(call cc-option,$(call cc-param,tsan-instrument-read-before-write=1)) \
$(call cc-param,tsan-distinguish-volatile=1)