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kbuild: Use relative path when building in a subdir of the source tree

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When doing make O=<subdir>, use '..' to refer to the source tree. This
allows for more readable compiler messages, and, more importantly, it
sets the VPATH to '..', so filenames in WARN_ON() etc. will be shorter.

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>
This commit is contained in:
Michal Marek 2014-04-25 23:25:18 +02:00
parent 890676c65d
commit 9da0763bdd
1 changed files with 11 additions and 1 deletions
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12
Makefile
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@ -149,7 +149,17 @@ else
_all: modules
endif
srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),.)
ifeq ($(KBUILD_SRC),)
# building in the source tree
srctree := .
else
ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
# building in a subdirectory of the source tree
srctree := ..
else
srctree := $(KBUILD_SRC)
endif
endif
objtree := .
src := $(srctree)
obj := $(objtree)