linux-kernel - Re: [RFC PATCH 3/4] gcov: compile specific gcov implementation based on gcc version

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Message-Id: <201308252029.45375.arnd@arndb.de>
Date:	Sun, 25 Aug 2013 20:29:45 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Frantisek Hrbata <fhrbata@...hat.com>
Cc:	Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, jstancek@...hat.com,
	keescook@...omium.org, rusty@...tcorp.com.au,
	linux-arch@...r.kernel.org, mgahagan@...hat.com,
	agospoda@...hat.com
Subject: Re: [RFC PATCH 3/4] gcov: compile specific gcov implementation based on gcc version

On Saturday 24 August 2013, Frantisek Hrbata wrote:
> If I understand it correctly, this would mean that you will be able to use only
> one implementation of gcov format at the time. Meaning you will be able to get
> coverage data for module, but not for kernel if it was compiled with different
> gcc(gcda format). This is probably ok if you work only on your module, but I'm
> not sure this is generally the right approach. In this case I would probably
> rather see some support for more gcov formats at the same time(e.g. set of
> callback operations per gcov version). Again I'm probably missing something, but
> I still cannot see reason why to add such feature. If you want gcov support just
> compile your kernel and modules with the same gcc version(gcda format). But if
> this is really needed maybe it would be better to consider some parallel support
> for more gcov formats based on the gcov_info version.

The kernel is always built with exactly one version, including all the modules.
I don't see any reason whatsoever to support externally built modules with gcov,
in particular when they are not built with the system compiler.

	Arnd
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