linux-kernel - Re: [RFC PATCH 3/6] kbuild: convert include and source paths

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Message-ID: <48209547.7020807@de.ibm.com>
Date:	Tue, 06 May 2008 19:28:39 +0200
From:	Peter Oberparleiter <peter.oberparleiter@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	ltp-list@...ts.sourceforge.net, ltp-coverage@...ts.sourceforge.net,
	sam@...nborg.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/6] kbuild: convert include and source paths

Andrew Morton wrote:
> On Mon, 05 May 2008 17:24:26 +0200 Peter Oberparleiter <peter.oberparleiter@...ibm.com> wrote:
> 
>> From: Peter Oberparleiter <peter.oberparleiter@...ibm.com>
>> 
>> Modify kbuild to convert relative include and source paths to absolute
>> form. Also change the module versioning mechanism to alter object file
>> names only after compiling.
>> 
>> Required by the gcov profiling infrastructure: source paths are
>> referenced by the compiled object files. Using relative paths or
>> object file names which are different from the source name would
>> prevent the gcov tool from finding the corresponding source files.

> It doesn't appear to affect __FILE__ in any way (which is good).  But I'm
> unsure what it _does_ affect.  The changelog implies that it will convert
> "liunx/foo.h" into /usr/src/linux/include/foo.h, only it doesn't.
> 
> ho hum.

This patch should convert

	gcc -Idir1 -c a.c -o a.o

to

	gcc -I/path/to/dir1 -c /path/to/a.c -o a.o

As a standalone change this has no visible effect, but when gcc option
-fprofile-arcs is specified (as done in patch 5), the resulting object
files should only contain absolute paths.


Regards,
  Peter
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