Re: Cross-building Debian `linux` package (Was: Re: Unmet dependencies problem in CrossToolchains)

On 04/06/2015 05:22 PM, Shawn Landden wrote:
> On Mon, Apr 6, 2015 at 3:15 PM, John Morris <[email protected]> wrote:
>>
>>
>> On 03/30/2015 10:45 PM, Wookey wrote:
>>>
>>> +++ John Morris [2015-03-30 22:16 -0500]:
>>>
>>>> I'm going to try setting up Wookey's cross-build daemon
>>>
>>>
>>> (careful - it really could do with some more work to be moderately
>>> general!)
>>>
>>>> or use sbuild directly, so never mind.
>>
>>
>> Thanks for the tips, Wookey.  I ended up adding `sbuild` functionality to
>> some scripts I had laying about, and it looks like all the Machinekit
>> dependencies can be compiled.
>>
>> However, there are a few packages that can't be *cross*-compiled, the most
>> irritating of which is the Debian `linux` package.  (I've modified the
>> packaging to build Xenomai and RTAI 'featuresets'.)
>>
>> The problem is the explicit `Build-Depends: gcc-4.9`, which can't be met by
>> the `crossbuild-essential-armhf` or its dependencies.  For now qemu will get
>> the job done, but of course take ages to do it.
>>
> What are you building linux for? If it is just the linux-libc-dev
> package then there might be a reduced build that only builds that.

Xenomai [1] and RTAI [2] are two real-time frameworks.  They're both 
based on the ipipe patch, which is a heavy modification to the Linux 
kernel.  Looks like I may have to start building the RT_PREEMPT kernel 
too, since that's been dropped from Jessie.  Machinekit [3] features a 
RT threads layer that we've ported to several threads systems.

The Beaglebone kernel took over 2 hours to compile with -j8 under qemu. 
  Ouch.

[1]: http://xenomai.org
[2]: https://www.rtai.org
[3]: http://machinekit.io

	John