[OE-core] [PATCH] meta/classes/menson.bbclass: Add python3 dependency

[Anibal Limon]

On Thu, 9 Jan 2020 at 05:23, Alexander Kanavin <alex.kanavin at gmail.com>
wrote:

> On Thu, 9 Jan 2020 at 02:43, Aníbal Limón <anibal.limon at linaro.org> wrote:
>
>> -DEPENDS_append = " meson-native ninja-native"
>> +DEPENDS_append = " meson-native ninja-native python3"
>>
>
> Apologies, but I cannot accept this. Not all meson-based components even
> ask for python, and this adds a non-trivial (built time wise) target
> dependency to them all. There is also the potential to create circular
> dependencies some time in the future if something required by target python
> switches over to meson.
>
> I suggest you rather patch meson itself, so that the python probe
> implemented there does not import a target module.
>

This issue comes from python3native.bbclass when use python target library
and include dirs and set _sysconfigdata too.

...
export PYTHON_LIBRARY="${STAGING_LIBDIR}/lib${PYTHON_DIR}${PYTHON_ABI}.so"
export PYTHON_INCLUDE_DIR="${STAGING_INCDIR}/${PYTHON_DIR}${PYTHON_ABI}"

export _PYTHON_SYSCONFIGDATA_NAME="_sysconfigdata"
...

Menson python module uses it to get python interpreter information to build
[1], I agree that not all recipes uses menson + python but it is
a single point to patch.

I understand the implications of build time being increase so the other
option is to add the dependency only on waffle.

Comments?

Regards,
Anibal

[1]
https://github.com/mesonbuild/meson/blob/master/mesonbuild/modules/python.py#L262


>
> Alex
>
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