[Buildroot] [PATCH] package/qpid-proton: needs host-python2

[Yann E. MORIN <yann.morin.1998@free.fr>]

Baruch, All,

On 2015-07-14 15:03 +0300, Baruch Siach spake thusly:
> On Tue, Jul 14, 2015 at 01:56:27PM +0200, Thomas Petazzoni wrote:
> > On Tue, 14 Jul 2015 14:48:04 +0300, Baruch Siach wrote:
> > > My interpretation of the cmake log is that cmake uses the python 
> > > interpreter it detects to run the scripts. In the failed cases cmake 
> > > detected host-python3 because host-python3 happened to build before 
> > > qpid-proton. cmake did not use the distro installed host python even 
> > > though it's python2 (most likely). So I'm not sure patching the scripts is 
> > > necessary.
> > 
> > It is necessary if your host machine has a Python 3 interpreter and not
> > a Python 2 interpreter. In this case the scripts will
> > run /usr/bin/python (because it's hardcoded in their source code), and
> > this will run Python 3.
> > 
> > So Yann's solution looks good. Am I missing something?
> 
> My point is that in the failed cases /usr/bin/python was not used, otherwise 
> the build would have succeeded. It seems that cmake uses the python 
> interpreter it detects to run the scripts. So patching the scripts doesn't 
> change anything by itself, IIUC.

OK, so you were right and wrong at the same time! ;-)

In fact, if we just add host-python as a dependency, and we do not have
a target python3 package, then we have no $(HOST_DIR)/usr/bin/python ,
only $(HOST_DIR)/usr/bin/python2 so cmake won't find it, and will
fallback to using the host's python, and we're back to square-one.

So, we have to tell cmake what python to use, with something like
  -DPYTHON_EXECUTABLE=$(HOST_DIR)/usr/bin/python2

And now, it works! :-)   (patch incoming shortly)

Thanks for directing me in the right direction! :-)

Regards,
Yann E. MORIN.

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
| +33 223 225 172 `------------.-------:  X  AGAINST      |  \e/  There is no  |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
'------------------------------^-------^------------------^--------------------'