[Buildroot] [PATCH 3/6] pkg-python: support host-python dependency different from the python in the target

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

Thomas, Samuel, All,

On 2014-03-29 14:26 +0100, Thomas Petazzoni spake thusly:
> On Sat, 29 Mar 2014 12:47:28 +0100, Yann E. MORIN wrote:
> 
> > I thionk we should explicitly check for (empty), 'python2' or 'python3',
> > and abort on any other value:
> > 
> >     ifeq ($($(2)_FORCE_HOST_PYTHON),python2)
> >     $(2)_DEPENDENCIES += host-python
> >     else ifeq ($($(2)_FORCE_HOST_PYTHON),python3)
> >     $(2)_DEPENDENCIES += host-python3
> >     else
> >     $$(error Incorrect value '$($(2)_FORCE_HOST_PYTHON)' for $(2)_FORCE_HOST_PYTHON)
> >     endif
> >     endif
> 
> Hum, most packages will *not* define <pkg>_FORCE_HOST_PYTHON I believe.
> Or do you plan to modify all packages that depend on host-python so
> that they all define a value for <pkg>_FORCE_HOST_PYTHON ?
> 
> I believe the idea was that if <pkg>_FORCE_HOST_PYTHON is not defined,
> then we default to whatever Python version has been selected.

That's what is done a few lines above in Samuel's patch:

    +ifeq ($($(2)_FORCE_HOST_PYTHON),)
     $(2)_DEPENDENCIES += $(if $(BR2_PACKAGE_PYTHON3),host-python3,host-python)
    +else
     [my code proposal here]
    +endif

Regards,
Yann E. MORIN.

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