[Buildroot] [PATCH v2 1/3] python-protobuf: Allow host building

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

William, All,

On 2017-01-12 11:15 -0800, William A. Kennington III spake thusly:
> Currently python-protobuf does not allow be built as a host package
> during a cross compile. We would like to be able to build nanopb as a
> host package but can't without host-python-protobuf.
> 
> Signed-off-by: William A. Kennington III <wak@google.com>
> ---
>  package/python-protobuf/python-protobuf.mk | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/package/python-protobuf/python-protobuf.mk b/package/python-protobuf/python-protobuf.mk
> index d8be76dd7..d46bda243 100644
> --- a/package/python-protobuf/python-protobuf.mk
> +++ b/package/python-protobuf/python-protobuf.mk
> @@ -13,4 +13,5 @@ PYTHON_PROTOBUF_DEPENDENCIES = host-protobuf
>  PYTHON_PROTOBUF_SETUP_TYPE = setuptools
>  PYTHON_PROTOBUF_SUBDIR = python
>  
> +$(eval $(host-python-package))
>  $(eval $(python-package))

This is not documented (AFAIK), but the host variant must go after the
target variant. Otherwise, strange things can happen (because of the way
variables have default values that depend on the order of evaluation,
like the source archive for example).

Note: this is valid for the following patch as awell, of course.

Regards,
Yann E. MORIN.


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