linux-kernel - Re: linux-next: Tree for Jun 21

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Message-ID: <3813680.TbHyagWbHe@wuerfel>
Date:	Tue, 21 Jun 2016 23:14:00 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Chris Metcalf <cmetcalf@...lanox.com>,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: linux-next: Tree for Jun 21

On Tuesday, June 21, 2016 8:50:48 PM CEST Peter Zijlstra wrote:
> 
> > So what's your build process for the cross tools, by the way?  I'm assuming
> > you're not doing a total bootstrap cross-tool build since you'd need minimal
> > kernel headers (linux/errno.h or whatever) in that case.  I assume you're using
> > the host headers to build the cross tool?
> > 
> > So I'm a little confused how the other kernel headers are working out for you,
> > e.g. <arch/icache.h> is referenced when building the tilegx libgcc.
> 
> I've no idea; I use this thing:
> 
>   git://git.infradead.org/users/segher/buildall.git
> 
> Although I've got some local modifications, none are to the actual
> toolchain building part (although I suppose I should send segher a
> patch).
> 
> I have binutils-gdb.git and gcc.bit checkouts and point the buildall
> config to that (both are on latest stable branches binutils-2_26-branch
> and gcc-6-branch resp.). And I point the kernel path to my current
> hacked up tree.
> 
> I don't really rebuild the entire toolchains often, mostly only when I
> really need a new GCC or its getting really old (like I used 5.3.0 for a
> long while).

I think the kernel headers are only needed for building glibc, which
buildall.git doesn't use: it only does the initial stage of creating
a cross-toolchain.

	Arnd