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kbuild: Use relative path when building in a subdir of the source tree
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>
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12
Makefile
12
Makefile
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@ -149,7 +149,17 @@ else
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_all: modules
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endif
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srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),.)
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ifeq ($(KBUILD_SRC),)
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# building in the source tree
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srctree := .
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else
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ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
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# building in a subdirectory of the source tree
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srctree := ..
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else
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srctree := $(KBUILD_SRC)
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endif
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endif
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objtree := .
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src := $(srctree)
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obj := $(objtree)
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