[Buildroot] [PATCH v14 4/5] package/pkg-meson.mk: set Python sysconfigdata

[Giulio Benetti]

Hi,

this patch breaks pkg-meson.mk on building glib2, as suggested by Adam 
lets substitute it with this patch:
https://patchwork.ozlabs.org/patch/1120929/

Best regards
-- 
Giulio Benetti
Benetti Engineering sas

On 10/21/19 10:04 PM, aduskett at gmail.com wrote:
> From: Adam Duskett <Aduskett at gmail.com>
> 
> meson has support for Python dependencies, to e.g. build Python modules.
> It parses Python's sysconfig module to find the appropriate
> configuration variables. However, the sysconfig module is the one for
> the host, _not_ for the target. Therefore, wrong values may be set. Many
> of them get overridden anyway by the cross-compilation.conf. One
> particular one that is problematic is that it uses the python-XXX.pc
> pkg-config file for the host instead of the target, because it
> explicitly sets the PKG_CONFIG_LIBDIR found in sysconfig.
> 
> Use the same trick as for python package: pass PYTHONPATH,
> PYTHONNOUSERSITE and _PYTHON_SYSCONFIGDATA_NAME in the environment to
> point to staging instead of host. This ensures the sysconfig from the
> target is used instead of the one from the host.
> 
> An alternative would be to patch meson to not use the PKG_CONFIG_LIBDIR
> from sysconfig. However, it is likely that other problems will pop up at
> some point because of using the wrong sysconfig.
> 
> Note that this approach will still break things when meson needs to
> build something for the host during a target build.
> 
> Signed-off-by: Adam Duskett <Aduskett at gmail.com>
> ---
> Changes v1 -> v14:
>    - Add this patch to the series.
> 
>   package/pkg-meson.mk | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/package/pkg-meson.mk b/package/pkg-meson.mk
> index 184a22a44a..b6360fb738 100644
> --- a/package/pkg-meson.mk
> +++ b/package/pkg-meson.mk
> @@ -84,6 +84,9 @@ define $(2)_CONFIGURE_CMDS
>   	    ) \
>   	    package/meson/cross-compilation.conf.in \
>   	    > $$($$(PKG)_SRCDIR)/build/cross-compilation.conf
> +	_PYTHON_SYSCONFIGDATA_NAME="$$(if $$(BR2_PACKAGE_PYTHON3),$$(PKG_PYTHON_SYSCONFIGDATA_NAME),_sysconfigdata)" \
> +	PYTHONPATH="$$(if $$(BR2_PACKAGE_PYTHON3),$$(PYTHON3_PATH),$$(PYTHON_PATH))" \
> +	PYTHONNOUSERSITE=1 \
>   	PATH=$$(BR_PATH) $$($$(PKG)_CONF_ENV) $$(MESON) \
>   		--prefix=/usr \
>   		--libdir=lib \
>