linux-kernel - Re: Kconfig and toolchain dependencies

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Message-ID: <20120204183259.GA28208@leaf>
Date:	Sat, 4 Feb 2012 10:32:59 -0800
From:	Josh Triplett <josh@...htriplett.org>
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

On Fri, Feb 03, 2012 at 01:29:09PM -0800, H. Peter Anvin wrote:
> It seems relatively straightforward to do if we were to manifest some
> CONFIG_ variables based on the target toolchain, e.g.
> 
> CONFIG_GCC=0x040601
> 
> ... and perhaps do other tests.  I suspect we would run the tests less
> frequently than what we do right now with the tests embedded in the
> Makefile.
> 
> Does anyone have a feel for if this would be a good addition, and if so
> where it best fits into the chain?

This seems like a *great* idea.  Unfortunately, a quick look at the
implementation of kbuild suggests that it doesn't currently implement
numeric comparisons (<, <=, >, >=), only equality (= and !=).  Most of
the time, a Kconfig file will want to write "depends GCC >=
some_version".

Looking at scripts/kconfig/expr.c, it doesn't look that hard to add,
though.

- Josh Triplett
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