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Date:      Fri, 16 Nov 2012 12:18:33 +0200
From:      Andriy Gapon <avg@FreeBSD.org>
To:        Daniel Braniss <danny@cs.huji.ac.il>
Cc:        Ian Lepore <freebsd@damnhippie.dyndns.org>, Mateusz Guzik <mjguzik@gmail.com>, Dimitry Andric <dim@FreeBSD.org>, Erik Cederstrand <erik@cederstrand.dk>, freebsd-current@FreeBSD.org
Subject:   Re: compiler info in kernel identification string
Message-ID:  <50A612F9.30509@FreeBSD.org>
In-Reply-To: <E1TZIix-0008lm-Al@kabab.cs.huji.ac.il>
References:  <20121113234303.GA15319@dft-labs.eu> <50A3639C.9050200@FreeBSD.org> <1352907497.1217.147.camel@revolution.hippie.lan> <50A57623.4020108@FreeBSD.org> <50A5EC7C.5050303@FreeBSD.org> <5B4DE1FD-5DD3-49A5-B8DB-6D4C03ABD742@cederstrand.dk> <50A606E7.5000302@FreeBSD.org> <E1TZIix-0008lm-Al@kabab.cs.huji.ac.il>

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This is starting to turn into a bikeshed, but anyway...

on 16/11/2012 12:00 Daniel Braniss said the following:
> the question as to what compiler was used to compile the kernel is a bit of an
> oxymoron, since the kernel is made up of many different modules, which get 
> compiled
> either by different compilers, or different compiler flags.

The canonical way to compile a kernel is to use buildkernel and compile modules
along with the kernel.  Other configurations are supported too, of course.

> since the compiler does 'sign' the modules it compiles (and clang will/should
> do it soon: http://llvm.org/bugs/show_bug.cgi?id=7292) some tool like
> file(1) could be modified to provide it, or config -x (8) ...

The key word in your note about clang is 'soon' as in 'not yet'.

Besides, when I see a bug report with a dmesg *I* want to immediately know what
compiler was used there.

> IMHO, the only meaningfull information added to uname was the svn/git(and 
> hopefully hg) rev. version.


-- 
Andriy Gapon



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