Failure to detect native module on MacOS

[FFY00]

* Building wheel...
! Using Meson to generate the project metadata (no `project` section in pyproject.toml)
+ meson setup --native-file=/Users/anubis/git/meson-python/tests/packages/purelib-and-platlib/.mesonpy-native-file.ini -Ddebug=false -Doptimization=2 --prefix=/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9 /Users/anubis/git/meson-python/tests/packages/purelib-and-platlib /Users/anubis/git/meson-python/tests/packages/purelib-and-platlib/.mesonpy-qssq8y7w/build
The Meson build system
Version: 0.63.2
Source dir: /Users/anubis/git/meson-python/tests/packages/purelib-and-platlib
Build dir: /Users/anubis/git/meson-python/tests/packages/purelib-and-platlib/.mesonpy-qssq8y7w/build
Build type: native build
Project name: purelib-and-platlib
Project version: 1.0.0
C compiler for the host machine: cc (clang 14.0.0 "Apple clang version 14.0.0 (clang-1400.0.29.102)")
C linker for the host machine: cc ld64 819.6
Host machine cpu family: aarch64
Host machine cpu: arm64
Found pkg-config: /opt/homebrew/bin/pkg-config (0.29.2)
Run-time dependency python3 found: YES 3.10
Program python found: YES (/Library/Developer/CommandLineTools/usr/bin/python3)
Build targets in project: 1

purelib-and-platlib 1.0.0

  User defined options
    Native files: /Users/anubis/git/meson-python/tests/packages/purelib-and-platlib/.mesonpy-native-file.ini
    debug       : false
    optimization: 2
    prefix      : /Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9

Found ninja-1.11.1 at /opt/homebrew/bin/ninja
+ meson compile
[2/2] Linking target plat.cpython-39-darwin.so
+ meson install --destdir /Users/anubis/git/meson-python/tests/packages/purelib-and-platlib/.mesonpy-qssq8y7w/install
ninja: Entering directory `/Users/anubis/git/meson-python/tests/packages/purelib-and-platlib/.mesonpy-qssq8y7w/build'
ninja: no work to do.
Installing plat.cpython-39-darwin.so to /Users/anubis/git/meson-python/tests/packages/purelib-and-platlib/.mesonpy-qssq8y7w/install/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/Library/Python/3.9/site-packages
Installing /Users/anubis/git/meson-python/tests/packages/purelib-and-platlib/pure.py to /Users/anubis/git/meson-python/tests/packages/purelib-and-platlib/.mesonpy-qssq8y7w/install/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/Library/Python/3.9/site-packages
WARNING Using heuristics to map files to wheel, this may result in incorrect locations
WARNING File could not be mapped to an equivalent wheel directory: /Users/anubis/git/meson-python/tests/packages/purelib-and-platlib/.mesonpy-qssq8y7w/install/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/Library/Python/3.9/site-packages/plat.cpython-39-darwin.so (/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/Library/Python/3.9/site-packages/plat.cpython-39-darwin.so)
Copying files to wheel...
[0/0] pure.pyy
Successfully built purelib_and_platlib-1.0.0-py3-none-any.whl

Here, plat.cpython-39-darwin.so gets installed to /Users/anubis/git/meson-python/tests/packages/purelib-and-platlib/.mesonpy-qssq8y7w/install/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/Library/Python/3.9/site-packages/. This is because Meson sets the prefix to /Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9, so we need to take that into account in the heuristics.

[FFY00]

Taking the prefix into account does not fix the issue, I think it may be some custom Meson handling? @eli-schwartz any ideas?

[FFY00]

The scheme in question (found via sysconfig._get_sysconfigdata_name()):

    'osx_framework_library': {
        'stdlib': '{installed_base}/lib/python{py_version_short}',
        'platstdlib': '{platbase}/lib/python{py_version_short}',
        'purelib': '/Library/Python/{py_version_short}/site-packages',
        'platlib': '/Library/Python/{py_version_short}/site-packages',
        'include': '/Library/Python/{py_version_short}{abiflags}/include',
        'platinclude': '/Library/Python/{py_version_short}{abiflags}/include',
        'scripts': '/usr/local/bin',
        'data': '/Library/Python/{py_version_short}',
        },

[rgommers]

I assume this goes away with Meson master?

[FFY00]

Yes, it seems so.

[dnicolodi]

Fixed in Meson 0.63.3 and later. meson-python requires Meson >= 0.63.3.