[gentoo-dev] [PATCH 0/5] distutils-r1.eclass: DISTUTILS_EXT to enable features specific to building extensions

["Michał Górny" <mgorny@gentoo.org>]

Hi,

Here's a patch series that adds a DISTUTILS_EXT variable that indicates
that the package in question builds Python extensions (i.e. loadable
.so modules) and enables a few related features:

1. adds DEPEND=${PYTHON_DEPS} to fix cross-compiling

2. adds IUSE=debug that controls passing -DNDEBUG/-UNDEBUG to builds
   (right now unlike most distros out there we are always building
   with assertions enabled)

3. limits our parallel build_ext optimization to DISTUTILS_EXT ebuilds
   (i.e. eliminates the few false positives triggering it right now)

The patches also include logic to automatically detect and report
(as a QA warning) missing DISTUTILS_EXT if a package is installing .so
files into site-packages.

Note that technically none of the above applies to ebuilds building Rust
extensions rather than C/Cython.  However, there's no trivial way to
distinguish one from the other for the purpose of QA check and none
of the above points do any real harm.  Especially that cargo.eclass
adds IUSE=debug anyway.

DISTUTILS_EXT should also be set if the extensions are built
conditionally to USE flags.  The only ill effect of doing that is that
PYTHON_DEPS are added unconditionally (unless you're using
DISTUTILS_OPTIONAL) rather than conditionally to the flag responsible
for the extension but that's a minor point anyway.

-- 
Best regards,
Michał Górny

Michał Górny (5):
  distutils-r1.eclass: Add DISTUTILS_EXT control variable
  distutils-r1.eclass: Add PYTHON_DEPS to DEPEND when DISTUTILS_EXT
  distutils-r1.eclass: Support IUSE=debug for DISTUTILS_EXT
  distutils-r1.eclass: Issue build_ext only w/ DISTUTILS_EXT
  distutils-r1.eclass: Detect missing DISTUTILS_EXT

 eclass/distutils-r1.eclass | 50 +++++++++++++++++++++++++++++++++-----
 1 file changed, 44 insertions(+), 6 deletions(-)

-- 
2.40.0