Date: Mon, 25 Feb 2013 09:34:46 +0100 From: =?ISO-8859-1?Q?Jean-S=E9bastien_P=E9dron?= <jean-sebastien.pedron@dumbbell.fr> To: freebsd-hackers@freebsd.org Subject: Re: Building a program to be used only during make buildkernel Message-ID: <512B2226.4070402@dumbbell.fr> In-Reply-To: <20130222165548.GM2598@kib.kiev.ua> References: <5127746A.6060702@dumbbell.fr> <20130222165548.GM2598@kib.kiev.ua>
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On 22.02.2013 17:55, Konstantin Belousov wrote:
> On Fri, Feb 22, 2013 at 02:36:42PM +0100, Jean-S?bastien P?dron wrote:
>> Hello,
>>
>> During the build of the "radeon" DRM driver in Linux, a C program is
>> first built to generate headers included by the driver. The program is=
>> not meant to be installed.
>>
>> In FreeBSD, how would one build and use such a program during the buil=
d
>> of a kernel module? And what if the driver is built into the kernel in=
stead?
>=20
> Look at the genasssym program, used by the kernel and several ABI modul=
es
> for exactly this use.
Thanks for the hint! I looked at sys/modules/linux/Makefile. If I
understand it correctly, there's no special magic in there, just regular
Makefile targets/rules, right?
Here's what I did:
---8<---
=2EPATH: ${.CURDIR}/../../../dev/drm2/radeon
(...)
MKREGTABLE=3D ./mkregtable
REG_SRCS_DIR=3D ${.CURDIR}/../../../dev/drm2/radeon/reg_srcs
${MKREGTABLE}: mkregtable.c @
${CC} -o $@ @/dev/drm2/radeon/mkregtable.c
rn50_reg_safe.h: ${REG_SRCS_DIR}/rn50 ${MKREGTABLE}
${MKREGTABLE} ${REG_SRCS_DIR}/rn50 > $@
(...)
CLEANFILES=3D \
rn50_reg_safe.h \
... \
${MKREGTABLE}
---8<---
It's working for me, but I don't know if it's correct. In particular:
o I'm not sure "${MKREGTABLE}" should depend on "@". One target in
modules/linux/Makefile has it, and I blindly copied it...
o I needed to use the full path to mkregtable.c
(@/dev/drm2/radeon/mkregtable.c). I thought I could use
${.IMPSRC} or "mkregtable.c" and the source would have been found
magically.
I haven't tried to build the module into the kernel yet.
--=20
Jean-S=E9bastien P=E9dron
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