linux-kernel - Re: [PATCH 3/6] samples: use uapiprogs support for seccomp

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Message-ID: <20140716103120.GA4710@ravnborg.org>
Date:	Wed, 16 Jul 2014 12:31:21 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Masahiro Yamada <yamada.m@...panasonic.com>
Cc:	Michal Marek <mmarek@...e.cz>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	David Herrmann <dh.herrmann@...glemail.com>,
	Jiri Kosina <jkosina@...e.cz>
Subject: Re: [PATCH 3/6] samples: use uapiprogs support for seccomp

On Wed, Jul 16, 2014 at 06:43:51PM +0900, Masahiro Yamada wrote:
> Hi Sam,
> 
> 
> On Sun, 13 Jul 2014 20:42:51 +0200
> Sam Ravnborg <sam@...nborg.org> wrote:
> 
> > Reduce complexity of seccomp Makefile by introducing use of uapiprogs support.
> > Build testet with i686 only.
> 
> tested ?
> 
> (Ditto in 4/6)
Thanks - will fix.

> I am interested in this series.
> 
> Forgive me if I am asking a stupid question..
> 
> 
> How can I build hostprogs for the same host as the kernel?
> (I mean, how can I override $(HOSTCC) for cross-compiling ?)

One way to do this:

make ARCH=sparc CROSS_COMPILE=sparc-leon-linux-gnu- HOSTCC=sparc-leon-linux-gnu-gcc

Notice that I override HOSTCC as part of the make comand line.
This allows me to override the "=" assignment in the top-level Makefile.

But then my build breaks as fixdep do not run on my host.

If you in general want to build a binary for the target then uapiprogs come in handy.
Only caveat here is that you will be using the exported kernel headers.

	Sam
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