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Not able to change the python installation being used by meson #726

@alphanoobie

Description

@alphanoobie

I am trying to setup matplotlib for contributing to it but build is failing because meson picks up system python instead of venv

python -m pip install --no-build-isolation --config-settings=editable-verbose=true --editable .
When i run this command i get the following output

Obtaining file:///D:/Programs/matplotlib
  Checking if build backend supports build_editable ... done
  Preparing editable metadata (pyproject.toml) ... error
  error: subprocess-exited-with-error

  × Preparing editable metadata (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [11 lines of output]
      + meson setup D:\Programs\matplotlib D:\Programs\matplotlib\build\cp312 -Dbuildtype=release -Db_ndebug=if-release -Db_vscrt=md --native-file=D:\Programs\matplotlib\build\cp312\meson-python-native-file.ini
      The Meson build system
      Version: 1.7.0
      Source dir: D:\Programs\matplotlib
      Build dir: D:\Programs\matplotlib\build\cp312
      Build type: native build
      Program python3 found: YES (C:\msys64\ucrt64\bin\python3.EXE)

      ..\..\meson.build:4:11: ERROR: Command `C:\msys64\ucrt64\bin\python3.EXE -m setuptools_scm` failed with status 1.

      A full log can be found at D:\Programs\matplotlib\build\cp312\meson-logs\meson-log.txt
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

I tried some things to make it use the venv python but had no luck so far.

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