From: Josh Triplett <josh@joshtriplett.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: "linux-kbuild@vger.kernel.org" <linux-kbuild@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: Kconfig and toolchain dependencies
Date: Sat, 4 Feb 2012 10:32:59 -0800 [thread overview]
Message-ID: <20120204183259.GA28208@leaf> (raw)
In-Reply-To: <4F2C51A5.1040800@zytor.com>
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
next prev parent reply other threads:[~2012-02-04 18:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-03 21:29 Kconfig and toolchain dependencies H. Peter Anvin
2012-02-04 18:32 ` Josh Triplett [this message]
2012-02-07 20:26 ` H. Peter Anvin
2012-02-24 22:19 ` Michal Marek
2012-02-24 22:23 ` H. Peter Anvin
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