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Date:	Wed, 18 Jun 2014 21:00:01 +0300
From:	Boaz Harrosh <openosd@...il.com>
To:	Michal Marek <mmarek@...e.cz>,
	linux-kernel <linux-kernel@...r.kernel.org>
CC:	Sam Ravnborg <sam@...nborg.org>
Subject: 9da0763 "kbuild: Use relative path ..." Broke my IDE

Hi Sir Michal

Below patch broke my stupid yet useful IDE tool. I use kdevelop.

kdevelop now gets confused on warnings and errors because it now comes out
as (for example):
../fs/ext4/fsync.c:63:3: error: implicit declaration of function ‘iputddd’ [-Werror=implicit-function-declaration]

>From what I understand kdevelop picks up the "[make] cd ..." outputs from make and
will interpret those for finding gcc files output. But Linux Makefile will suppress
these messages and kdevelop as no way to interpret the "../xxxx"

I do not know what other IDEs do, but this one here is not smart enough.

Could we please define a new input to Makefile that will revert to
old behavior. like:
	KBUILD_FULL_PATH

let me cook up a patch tomorrow (getting late here)
Thanks
Boaz

The patch that broke it
----
>From 9da0763bdd82572be243fcf5161734f11568960f Mon Sep 17 00:00:00 2001
From: Michal Marek <mmarek@...e.cz>
Date: Fri, 25 Apr 2014 23:25:18 +0200
Subject: [PATCH] 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@...nborg.org>
Signed-off-by: Michal Marek <mmarek@...e.cz>
---
 Makefile | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 3e134ec..f4702c1 100644
--- a/Makefile
+++ b/Makefile
@@ -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)
-- 
1.9.3

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