out of tree kernel modules (was: compiling modules and FDT define)

[Adrian Chadd]

On 7 August 2016 at 18:11, Warner Losh <wlosh at bsdimp.com> wrote:
>
>> On Aug 7, 2016, at 4:13 PM, Bernd Walter <ticso at cicely7.cicely.de> wrote:
>>
>> On Fri, Aug 05, 2016 at 08:20:11PM -0700, Adrian Chadd wrote:
>>> Hi,
>>>
>>> Try adding opt_platform.h to SRCS in the module makefile?
>>>
>>> You don't need to add it to the tree. You just have to setup your path
>>> to point things /at/ a kernel build tree withall the opt_xxx.h in
>>> them.
>>>
>>> here's what I do:
>>>
>>> #!/bin/sh
>>>
>>> X_SRCDIR=${X_SRCDIR:="/home/adrian/work/freebsd/head/src/"}
>>> X_KERNDIR=${X_KERNDIR:="/home/adrian/work/freebsd/head/obj/usr/home/adrian/work/freebsd/head/src/sys/GERTRUDE/"}
>>> X_KMODOWN=${X_KMODOWN:="adrian"}
>>> X_KMODGRP=${X_KMODGRP:="adrian"}
>>>
>>> # This allows for -HEAD includes for net80211 ..
>>> env CFLAGS="-I../../../sys/" \
>>> make \
>>>    MODULES_OVERRIDE="" \
>>>    DEBUG_FLAGS="-g" \
>>>    DEBUG_FLAGS="-g" \
>>>    KMODDIR="/home/adrian/git/github/erikarn/athp/otus/freebsd/modules/" \
>>>    KMODOWN="${X_KMODOWN}" \
>>>    KMODGRP="${X_KMODGRP}" \
>>>    MAKESYSPATH="${X_SRCDIR}/share/mk" \
>>>    SYSDIR="${X_SRCDIR}/sys/" \
>>>    KERNBUILDDIR="${X_KERNDIR}" \
>>>    KERN_DEBUGDIR="" \
>>>    $@
>>>
>>> That gets me all the bits I need to be able to run make in module
>>> directories and get the correct includes/links setup.
>>
>> Oh damn - it used to be much easier than that.
>> I'm still used to "make all install" for out of tree kernel modules.
>> How is it handled for the few kmods in ports?
>
> Mostly by setting KERNBUILDDIR correctly. If we have to jump through all these hoops too,
> then I’ll take a look at fixing things…. The above looks more complex than should be
> required.

* You don't need KMOD* unless you're installing somewhere other than
/boot/modules as root; I set that so I can build/install as adrian
* the last time I checked, KERNBUILDDIR didn't seem to be enough



-adrian