linux-kernel - Re: [PATCH] unifdef: drop unused errno.h include

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Date:	Mon, 12 Dec 2011 11:06:44 +0000
From:	Tony Finch <dot@...at.at>
To:	Michal Marek <mmarek@...e.cz>
cc:	Mike Frysinger <vapier@...too.org>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] unifdef: drop unused errno.h include

On Tue, Dec 06, 2011 at 05:26:50PM -0500, Mike Frysinger wrote:
>
> This is the only header on my system that ends up requiring kernel
> headers, so if the kernel headers aren't available, we end up being
> unable to install kernel headers :).

I have some sympathy for this problem but I tend to think that it's
unreasonable to expect unifdef to work with an incomplete compiler
installation.

> Since this file doesn't actually use anything from errno.h, drop
> the include so it at least makes us a bit more robust on glibc.

The Linux kernel currently has unifdef-2.5. Version 2.6 has better error
handling so it uses the declaration of errno but not any of the E*
values. I could perhaps rejig it to avoid this if it really is important
to be able to bootsrap a system with incomplete headers.

Tony.
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