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[v2,5/5] kbuild: Use relative path when building in a subdir of the source tree

Message ID 1399639944-20551-6-git-send-email-mmarek@suse.cz (mailing list archive)
State New, archived
Headers show

Commit Message

Michal Marek May 9, 2014, 12:52 p.m. UTC 
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>
---
v1->v2: No changes

 Makefile | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)
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Patch

diff --git a/Makefile b/Makefile
index 4da1c4b..9872c53 100644
--- a/Makefile
+++ b/Makefile
@@ -153,7 +153,17 @@  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)