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Date: Thu, 30 Apr 2015 10:51:04 +0200
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai] Xeno3.x xeno-config --kcflags
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To: =?windows-1252?Q?=22H=E4nel-Baas=2C_Alexander=22?= <alexander.haenel-baas@sieb-meyer.de>, Jan Kiszka <jan.kiszka@siemens.com>
Cc: "xenomai@xenomai.org" <xenomai@xenomai.org>

On 04/22/2015 08:29 AM, Philippe Gerum wrote:
> On 04/22/2015 08:14 AM, H=E4nel-Baas, Alexander wrote:
>> Hi Jan
>>
>> You are right, kbuild resolve it.
>>
>> My mistake: I stored the kcflags in a variable and put this variable in =
the EXTRA_CFLAGS from the make file.
>> XENOMAI_K_CFLAGS  =3D $(shell /usr/xenomai/bin/xeno-config --rtdm --kcfl=
ags)
>> EXTRA_CFLAGS +=3D $(XENOMAI_K_CFLAGS)
>> The result was: EXTRA_CFLAGS=3D -Iarch/$(SRCARCH)/xenomai/include.
>>
>> So I need a second expand step from $(SRCARCH).
>> My solution is the eval function:
>> $(eval EXTRA_CFLAGS +=3D $(XENOMAI_K_CFLAGS))
>> And now I get:  EXTRA_CFLAGS=3D -Iarch/arm/xenomai/include=20
>> and now module builds are success full.
>>
>> Thank you very much for your post.
>>
>=20
> Actually, this xeno-config --kcflags I came up with is overly and
> uselessly complex. Since we patch the build system for merging the
> Xenomai bits into the kernel image, we could just define a plain make
> variable for holding those extra flags, which depend on the file layout
> of the Xenomai release patched in only, so running a script to get them
> is 100% overkill.
>=20
> I'll come up with something simpler in the next days, so that Makefiles
> can just refer to $(RTDM_CFLAGS) or something along these lines.
>=20

You won't need any extra CFLAGS anymore for building RTDM drivers, with
this commit from the -next branch:

http://git.xenomai.org/xenomai-3.git/commit/?h=3Dnext&id=3Da3a30499b7ffd9a3=
6c18d909909b4f45bf3f710a

For these changes to take effect, you will have to run the
prepare-kernel.sh script on a fresh kernel, so that the kernel Makefiles
are patched properly.

In other words, with this changes in, you can drop the xeno-config
--kcflags invocation from your Makefiles building RTDM drivers.

--=20
Philippe.