Allow meson wrapper to use backends other than ninja

[Makogan]

Changelog: Fix: Let legacy Meson build helper use other backends apart from ninja.
Docs: omit

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Issue: #10440

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[memsharded]

This would need some tests to check it is working. Could be unit or integration, not necessary full functional test.

Thanks for contributing!

[franramirez688]

Thanks again for your PR @Makogan

As @memsharded said, please, it would be great some tests checking it. As a suggestion, have a look at the tests from conans/test/unittests/client/build/meson_test.py It could be a good place to add them.
Let us know if you have any questions.

[Makogan]

I added a unit test and I am trying to run it, the docs say to do python -m tox after installing ig it, I am getting a ton of errors like this:

___________________________________________________________________ ERROR collecting conans/test/integration/tools/cpu_count_test.py ___________________________________________________________________ 
ImportError while importing test module 'C:\Users\Makogan\mako_conan\conans\test\integration\tools\cpu_count_test.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
C:\Python311\Lib\importlib\__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
conans\test\integration\tools\cpu_count_test.py:4: in <module>
    from conans.test.utils.tools import TestClient
conans\test\utils\tools.py:15: in <module>
    import bottle
.tox\full\Lib\site-packages\bottle.py:44: in <module>
    from inspect import getargspec
E   ImportError: cannot import name 'getargspec' from 'inspect' (C:\Python311\Lib\inspect.py)

[memsharded]

If you are adding 1 or just a very few unit tests, the best is to run them directly with pytest conans/test/../path/to/test/test_file.py, no need to run the full suite (that also requires to have more build tools installed). Then you can submit and our CI will check everything. Thanks!

[franramirez688]

Hi @Makogan! I have added a simple unit test to check that it's working the change made for other backends and a little refactor to have only one _run_meson_targets method.
@memsharded I have checked a couple of conan-center-index recipes to verify that we're not breaking anything and it's so. If all the tests are passing, we can include this PR for the next 1.45 release.

[Makogan]

Sorry I had some personal and professional issues and forgot about the PR.

[franramirez688]

Don't worry at all @Makogan
The fix is already merged so the problem should be solved for the next 1.45 release.