| Message ID | 20241110013649.34903-9-masahiroy@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | kbuild: support building external modules in a separate build directory | expand |
diff --git a/Makefile b/Makefile index 38ce19747728..5488aa96b46b 100644 --- a/Makefile +++ b/Makefile @@ -1041,8 +1041,10 @@ ifdef CONFIG_CC_IS_GCC KBUILD_CFLAGS += -fconserve-stack endif -# change __FILE__ to the relative path from the srctree -KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) +# change __FILE__ to the relative path to the source directory +ifdef building_out_of_srctree +KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=) +endif # include additional Makefiles when needed include-y := scripts/Makefile.extrawarn
This commit makes -fmacro-prefix-map work for external modules built in a separate output directory. It improves the reproducibility of external modules and provides the benefits described in commit a73619a845d5 ("kbuild: use -fmacro-prefix-map to make __FILE__ a relative path"). When building_out_of_srctree is not defined (e.g., when the kernel or external module is built in the source directory), this option is unnecessary. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu> --- Changes in v2: - Check building_out_of_srctree instead of VPATH Makefile | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)