Building a program to be used only during make buildkernel

[Jean-Sébastien Pédron]

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 build
>> of a kernel module? And what if the driver is built into the kernel instead?
> 
> Look at the genasssym program, used by the kernel and several ABI modules
> 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<---
.PATH:	${.CURDIR}/../../../dev/drm2/radeon

(...)

MKREGTABLE=	./mkregtable
        REG_SRCS_DIR=	${.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=	        \
        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.

-- 
Jean-Sébastien Pédron

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