proposal: merge waf build of s4 to master

[simo]

On Wed, 2010-04-14 at 09:29 +1000, tridge at samba.org wrote:
> Hi Simo,
> 
>  > But in general a qemu dependency seem quite a lot to ask when autotools
>  > do not require anything just that you pass correct cached ac_cv_ vars.
> 
> yes, while I think using --cross-execute is ideal if its available, I
> agree we need a method for when its too difficult or not possible. See
> my last msg for a proposed solution:
> 
>   http://lists.samba.org/archive/samba-technical/2010-April/070563.html
> 
> I haven't actually ever used the cached ac_cv_* method with autoconf
> for cross-compilation. I don't think I'll try and implement it in a
> autotools compatible way though. I think cross-compiling is
> specialised enough that requiring people to read some docs on
> wiki.samba.org to understand how to do it with our build system isn't
> unreasonable.
> 
> I think implementing the above proposal would be quite easy. I'll
> probably also make it that you can do both steps at once, using:
> 
>  waf configure --cross-answers=myanswers.txt --cross-answers-build=myanswers.txt
> 
> it would then add any new template entries to myanswers.txt, and would
> using any existing ones that are there. You will know you are done
> when there are no UNKNOWN entries in the file.
> 
> It would be an iterative process, as a configure test answer can
> change what the remaining configure tests are.
> 
> I may also make the file be a valid python data structure (maybe in
> cPickle format?). That would allow the answer to be multi-line, in
> case someone has a configure test that returns a complex string. We
> don't have any of those at the moment, but there is nothing stopping
> someone adding one.
> 
> If you like the general approach, I think (hope!) implementing this
> will be fairly simple.

Yes, this approach looks quite sensible.
+1

Simo.

-- 
Simo Sorce
Samba Team GPL Compliance Officer <simo at samba.org>
Principal Software Engineer at Red Hat, Inc. <simo at redhat.com>