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| author |  Masahiro Yamada <masahiroy@kernel.org>
| 2024-04-27 23:55:02 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org>
| 2024-05-10 04:34:52 +0900 |
| commit | b1992c3772e69a6fd0e3fc81cd4d2820c8b6eca0 (patch) | |
| tree | 60cc6428700d3582666b62d1d9dd741656efe1ee /arch/x86/um | |
| parent | kbuild: use $(obj)/ instead of $(src)/ for common pattern rules (diff) | |
| download | linux-b1992c3772e69a6fd0e3fc81cd4d2820c8b6eca0.tar.gz linux-b1992c3772e69a6fd0e3fc81cd4d2820c8b6eca0.tar.bz2 linux-b1992c3772e69a6fd0e3fc81cd4d2820c8b6eca0.zip | |
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 'arch/x86/um')
| -rw-r--r-- | arch/x86/um/vdso/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/um/vdso/Makefile b/arch/x86/um/vdso/Makefile index b86d634730b2..2303fa59971c 100644 --- a/arch/x86/um/vdso/Makefile +++ b/arch/x86/um/vdso/Makefile @@ -63,7 +63,7 @@ quiet_cmd_vdso = VDSO $@ cmd_vdso = $(CC) -nostdlib -o $@ \ $(CC_FLAGS_LTO) $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \ - sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@' + sh $(src)/checkundef.sh '$(NM)' '$@' VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack GCOV_PROFILE := n |