linux-kernel - Re: randconfig build error with next-20150316, in samples/kdbus/kdbus-workers

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Message-ID: <CANq1E4Rc+Bp0mb=VxiV7Qgb1Wbz=TUExU4NwUcCsu9_DnC9pRw@mail.gmail.com>
Date:	Mon, 16 Mar 2015 17:31:40 +0100
From:	David Herrmann <dh.herrmann@...il.com>
To:	Jim Davis <jim.epost@...il.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next <linux-next@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Mack <daniel@...que.org>,
	David Herrmann <dh.herrmann@...glemail.com>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: randconfig build error with next-20150316, in samples/kdbus/kdbus-workers

Hi

On Mon, Mar 16, 2015 at 5:22 PM, Jim Davis <jim.epost@...il.com> wrote:
> Building with the attached random configuration file,
>
> In file included from ./include/uapi/linux/kdbus.h:12:0,
>                  from samples/kdbus/kdbus-api.h:5,
>                  from samples/kdbus/kdbus-workers.c:79:
> ./include/uapi/linux/types.h:9:2: warning: #warning "Attempt to use
> kernel headers from user space, see
> http://kernelnewbies.org/KernelHeaders" [-Wcpp]
>  #warning "Attempt to use kernel headers from user space, see
> http://kernelnewbies.org/KernelHeaders"
>   ^
> In file included from ./include/uapi/linux/posix_types.h:4:0,
>                  from ./include/uapi/linux/types.h:13,
>                  from ./include/uapi/linux/kdbus.h:12,
>                  from samples/kdbus/kdbus-api.h:5,
>                  from samples/kdbus/kdbus-workers.c:79:
> ./include/uapi/linux/stddef.h:1:28: fatal error: linux/compiler.h: No
> such file or directory
>  #include <linux/compiler.h>
>                             ^
> compilation terminated.
> scripts/Makefile.host:91: recipe for target 'samples/kdbus/kdbus-workers' failed
> make[2]: *** [samples/kdbus/kdbus-workers] Error 1

If you build the samples in ./samples/, you need up-to-date kernel
headers. The kdbus samples rely on linux/kdbus.h to be available.

A simple "make headers_install" will copy the headers to the local
directory ./usr/ in your kernel tree. This is the preferred location
over /usr/include by all tools in the kernel tree. That is, run "make
headers_install" once and your local tree will build fine. Once your
kernel-headers in /usr/include are up-to-date, it will work just
out-of-the-box again.

In other words, if CONFIG_SAMPLES is enabled, you need the sanitized
kernel headers in your include path.

Thanks
David
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