linux-kernel - Re: Kconfig and toolchain dependencies

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Message-ID: <4F480CDE.8010605@suse.cz>
Date:	Fri, 24 Feb 2012 23:19:10 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Kconfig and toolchain dependencies

Dne 3.2.2012 22:29, H. Peter Anvin napsal(a):
> Right now, we don't have a good way to encode toolchain dependencies in
> Kconfig.  This makes it hard to add optional features which depend on
> newer toolchain features.
> 
> If we just add them, then it breaks all*config and randconfig on
> platforms with the older toolchains unless the user manually adds
> exclusion rules.  This is bad for testing.
> 
> It seems relatively straightforward to do if we were to manifest some
> CONFIG_ variables based on the target toolchain, e.g.
> 
> CONFIG_GCC=0x040601

(sorry for the late reply)

It would be a bit tricky, because the toolchain version depends also on
CONFIG_CROSS_COMPILE. So Kconfig would need to know the semantics of
CONFIG_CROSS_COMPILE and CONFIG_GCC and the dependency of the latter on
the former.

Michal
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