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

Arnout Vandecappelle (Essensium/Mind) arnout at mind.be
Tue Feb 4 14:24:51 UTC 2020

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

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).

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


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