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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
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Makefile
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Makefile
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KBUILD_CFLAGS += -fconserve-stack
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endif
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-
# change __FILE__ to the relative path from the srctree
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KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
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# change __FILE__ to the relative path to the source directory
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ifdef building_out_of_srctree
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KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=)
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endif
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# include additional Makefiles when needed
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include-y := scripts/Makefile.extrawarn