[MacPorts] #68545: py311-numpy @1.26.1 build failure - cannot find cython

[MacPorts]

#68545: py311-numpy @1.26.1 build failure - cannot find cython
-----------------------+-----------------------
  Reporter:  RobK88    |      Owner:  michaelld
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.8.1
Resolution:            |   Keywords:  lion
      Port:  py-numpy  |
-----------------------+-----------------------

Comment (by markmentovai):

 1. I noticed that you’re building `+gfortran+openblas`. The Portfile has a
 comment

 {{{
     # However, +gfortran+openblas is broken on i386, see above
 }}}

 Does it make a difference if you build with the current default variant
 for i386, which should be `+gfortran` but not `+openblas`? (Probably not.)

 2. Are you equipped to debug whether `CYTHON` is still set during the
 wheel build? You could try:

 {{{
 git clone https://github.com/numpy/numpy.git
 cd numpy
 git checkout v1.26.1
 git submodule init
 git submodule update
 patch -p0 <
 /opt/local/var/macports/sources/rsync.macports.org/macports/release/tarballs/ports/python
 /py-numpy/files/patch-build_cython_path.diff
 }}}

 You could also patch this in to help debug:

 {{{
 diff --git vendored-meson/meson/meson.py vendored-meson/meson/meson.py
 index 6f3ba2a9ee46..5ffe4f8a45b4 100755
 --- vendored-meson/meson/meson.py
 +++ vendored-meson/meson/meson.py
 @@ -37,4 +37,7 @@ if (meson_exe.parent / 'mesonbuild').is_dir():
  from mesonbuild import mesonmain

  if __name__ == '__main__':
 +    import os
 +    print('@@@ mesonmain = %r' % mesonmain, file=sys.stderr)
 +    print('@@@ CYTHON = %r' % os.environ['CYTHON'], file=sys.stderr)
      sys.exit(mesonmain.main())
 }}}

 And build with `CYTHON` set:

 {{{
 PATH=/opt/local/bin:/usr/bin:/bin CYTHON=/opt/local/bin/cython-3.11
 OPENBLAS=/opt/local/lib MKLROOT=None ATLAS=None
 SETUPTOOLS_USE_DISTUTILS=stdlib python3.11 -m build --no-isolation --wheel
 }}}

 When I build with this, I see at the top:

 {{{
 * Getting build dependencies for wheel...
 * Building wheel...
 + /opt/local/bin/python3.11 /private/tmp/numpy/vendored-
 meson/meson/meson.py setup /private/tmp/numpy /private/tmp/numpy/.mesonpy-
 _hbx4qlc/build -Dbuildtype=release -Db_ndebug=if-release -Db_vscrt=md
 --native-file=/private/tmp/numpy/.mesonpy-_hbx4qlc/build/meson-python-
 native-file.ini
 @@@ mesonmain = <module 'mesonbuild.mesonmain' from '/private/tmp/numpy
 /vendored-meson/meson/mesonbuild/mesonmain.py'>
 @@@ CYTHON = '/opt/local/bin/cython-3.11'
 The Meson build system
 […]
 }}}

 showing that `CYTHON` is set and `mesonbuild` comes from the patched
 `vendored-meson` we expect.

 If things are different for you, it’ll tell us where to look next.

 And if things are the same for you and the build completes when done this
 way, it’ll tell us that there’s something else wrong with the build within
 `port build` but not when done manually.

-- 
Ticket URL: <https://trac.macports.org/ticket/68545#comment:8>
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