linux-kernel - Re: [RFC PATCH] Use target compiler for user binaries in samples/

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Date:	Thu, 4 Apr 2013 10:18:02 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Arnd Bergmann <arnd@...db.de>, Michal Marek <mmarek@...e.cz>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [RFC PATCH] Use target compiler for user binaries in samples/

On Sun, 31 Mar 2013, Sam Ravnborg wrote:

> The user-space binaries build in samples/ uses the installed
> headers for the kernel.
> Therefore it is wrong that they use the host compiler
> to build the samples.
> 
> Following is an attempt to create some infrastructure
> for building user-space binaries that uses the uapi headers.
> 
> As my sparc cross toolchain does not supporting building
> user-space I have not been able to test this as good as I hoped...
> 
> But faking that my native gcc is a cross gcc seems to work.
> 
> This adds two new variables to the top-level Makefile:
> UAPICC and UAPICFLAGS
> 
> The architectures that supports both 32 and 64 bit set the
> appropriate flags in UAPICFLAGS.
> 
> scripts/Makefile.uapiprogs cantains all the infrastructure.
> 
> I updated the samples for hidraw and seccomp to use the new
> infrastructure.
> 
> The file says:
> +# Sample syntax (see Documentation/kbuild/makefiles.txt for reference)
> 
> But I did not bother to write this yet - awaiting feedback.

I generally like the idea.

It'd be nice to know whether this fixes the ARCH=sparc allyesconfig builds 
Fengguang has been reporting. Fengguang ... ?

Thanks,

-- 
Jiri Kosina
SUSE Labs
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