Date: Fri, 16 Nov 2012 12:54:09 +0200 From: Daniel Braniss <danny@cs.huji.ac.il> To: Andriy Gapon <avg@FreeBSD.org> 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: <E1TZJYo-0009eF-CR@kabab.cs.huji.ac.il> In-Reply-To: <50A612F9.30509@FreeBSD.org> 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> <50A612F9.30509@FreeBSD.org>
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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 this does not guarantee uniformity, just look at the output it produces and you will see different compilers/assemblers/scripts/flags > 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'. Dimitry wrote that he will handle it :-) > > Besides, when I see a bug report with a dmesg *I* want to immediately know what > compiler was used there. today it's clang vs. gcc -- transition time --, but again it's only part of the story, and soon it will only be noise. > > > IMHO, the only meaningfull information added to uname was the svn/git(and > > hopefully hg) rev. version. > > > -- > Andriy Gapon
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