From 1d3730f0012fa04ec392b52cc21f945704ac2e16 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Sun, 10 Nov 2024 10:34:36 +0900 Subject: [PATCH] kbuild: support -fmacro-prefix-map for external modules 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 Reviewed-by: Nicolas Schier --- Makefile | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/Makefile b/Makefile index 5aba1ac89375d..a4ac0133f7cde 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 -- 2.49.0