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author | Masahiro Yamada | 2024-04-27 23:55:02 +0900 |
---|---|---|
committer | Masahiro Yamada | 2024-05-10 04:34:52 +0900 |
commit | b1992c3772e69a6fd0e3fc81cd4d2820c8b6eca0 (patch) | |
tree | 60cc6428700d3582666b62d1d9dd741656efe1ee /scripts/Makefile.modpost | |
parent | 9a0ebe5011f49e932bb0a2cea2034fd65e6e567e (diff) |
kbuild: use $(src) instead of $(srctree)/$(src) for source directory
Kbuild conventionally uses $(obj)/ for generated files, and $(src)/ for
checked-in source files. It is merely a convention without any functional
difference. In fact, $(obj) and $(src) are exactly the same, as defined
in scripts/Makefile.build:
src := $(obj)
When the kernel is built in a separate output directory, $(src) does
not accurately reflect the source directory location. While Kbuild
resolves this discrepancy by specifying VPATH=$(srctree) to search for
source files, it does not cover all cases. For example, when adding a
header search path for local headers, -I$(srctree)/$(src) is typically
passed to the compiler.
This introduces inconsistency between upstream and downstream Makefiles
because $(src) is used instead of $(srctree)/$(src) for the latter.
To address this inconsistency, this commit changes the semantics of
$(src) so that it always points to the directory in the source tree.
Going forward, the variables used in Makefiles will have the following
meanings:
$(obj) - directory in the object tree
$(src) - directory in the source tree (changed by this commit)
$(objtree) - the top of the kernel object tree
$(srctree) - the top of the kernel source tree
Consequently, $(srctree)/$(src) in upstream Makefiles need to be replaced
with $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Diffstat (limited to 'scripts/Makefile.modpost')
-rw-r--r-- | scripts/Makefile.modpost | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost index 739402f45509..68c4f9ee0c90 100644 --- a/scripts/Makefile.modpost +++ b/scripts/Makefile.modpost @@ -112,7 +112,7 @@ else # set src + obj - they may be used in the modules's Makefile obj := $(KBUILD_EXTMOD) -src := $(obj) +src := $(if $(VPATH),$(VPATH)/)$(obj) # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS include $(kbuild-file) |