linux-kernel - [PATCH v2] tags: honor COMPILED_SOURCE with apart output directory

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Message-Id: <1481819733-3002-1-git-send-email-robert.jarzmik@free.fr>
Date:   Thu, 15 Dec 2016 17:35:33 +0100
From:   Robert Jarzmik <robert.jarzmik@...e.fr>
To:     Michal Marek <mmarek@...e.com>
Cc:     linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Robert Jarzmik <robert.jarzmik@...e.fr>
Subject: [PATCH v2] tags: honor COMPILED_SOURCE with apart output directory

When the kernel is compiled with an "O=" argument, the object files are
not necessarily in the source tree, and more probably in another tree.

In this situation, the current used check doesn't work, and
COMPILED_SOURCE tags is broken with O= builds.

This patch fixes it by looking for object files both in source tree and
potential destination tree.

It was verified that in the case of O= usage, the current directory is
the build tree, ie. the tree referenced by O=xxx, and j is the source
tree path concatenated with relative path of the object to the source
tree root, hence the simple expression to compute "k" as the built
object.

Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
---
Since v1: amended k expression, Marek's comments
---
 scripts/tags.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/tags.sh b/scripts/tags.sh
index a2ff3388e5ea..35cb64d5211c 100755
--- a/scripts/tags.sh
+++ b/scripts/tags.sh
@@ -106,7 +106,8 @@ all_compiled_sources()
 		case "$i" in
 			*.[cS])
 				j=${i/\.[cS]/\.o}
-				if [ -e $j ]; then
+				k="${j#$tree}"
+				if [ -e $j -o -e "$k" ]; then
 					echo $i
 				fi
 				;;
-- 
2.1.4