[Buildroot] [PATCH 0/5] [RFC] Introduce cross-bin directory

[Arnout Vandecappelle <arnout@mind.be>]

On 04/02/2020 15:24, Arnout Vandecappelle (Essensium/Mind) wrote:
> This series is the start of a "cross-bin" directory that I've mentioned
> a couple of times already.
> 
> The idea is that host-tools that are meant for cross-building but don't
> encode the cross-target in their name can be put in this directory, and
> we put this directory in front of PATH for cross-compilation. For
> example, the pkg-config wrapper is really a cross-compilation wrapper.
> To be able to support building of host tools with it, we need to add
> environment variables to force host compilation in HOST_CONFIGURE_OPTS.
> By moving the pkg-config wrapper to the cross-bin directory, we can
> avoid that: for cross-compilation (i.e. target packages), the cross-bin
> dir is put in front of PATH, so the pkg-config wrapper for target is
> found. For native compilation (i.e. host packages), the cross-bin dir
> is *not* put in PATH, so the normal pkg-config configuration will be
> used.
> 
> This series does not do that yet for pkg-config itself. It is only done
> for python and python3. The idea is to start with something a little
> bit less far-reaching that pkg-config. Also, the python3 change is
> needed for meson packages that build python modules from C code (e.g.
> recent python-gobject). These need to have _PYTHON_SYSCONFIGDATA_NAME
> set in the environment, but we can't just export that unconditionally
> even for target packages because sometimes (e.g. in libglib2) meson
> builds native python modules as part of the build and those should
> *not* have _PYTHON_SYSCONFIGDATA_NAME set to the target name... The
> python3 wrapper nicely solves this.
> 
> The python2 wrapper is added as well for symmetry, and because it
> allows us to simplify the inner-python-package definitions.
> 
> This series is posted as an RFC, but it can actually be applied as is.
> It is a requirement for many packages that use the newly-added
> gobject-introspection (e.g. gstreamer1, python-gobject).

 Yann noticed that he has posted something similar/related three years ago:

http://lists.busybox.net/pipermail/buildroot/2015-December/147891.html


 Regards,
 Arnout

> 
> Arnout Vandecappelle (5):
>   package/Makefile.in: add HOST_BIN_CROSS
>   package/python3: install wrapper in HOST_BIN_CROSS
>   package/python: install wrapper in HOST_BIN_CROSS
>   package/pkg-python: rely on python wrapper in HOST_BIN_CROSS
>   package/pkg-meson: use TARGET_MAKE_ENV in configure
> 
>  package/Makefile.in               |  5 ++++-
>  package/pkg-meson.mk              |  2 +-
>  package/pkg-python.mk             | 22 +++-------------------
>  package/python/python-wrapper.in  | 10 ++++++++++
>  package/python/python.mk          | 17 ++++++++++++++---
>  package/python3/python-wrapper.in | 24 ++++++++++++++++++++++++
>  package/python3/python3.mk        | 17 ++++++++++++++---
>  7 files changed, 70 insertions(+), 27 deletions(-)
>  create mode 100644 package/python/python-wrapper.in
>  create mode 100644 package/python3/python-wrapper.in
>