ENH: f2py: add --f2cmap option for specifying the name of .f2py_f2cmap #15113
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Previously, f2py loaded the type mappings from a file ``.f2py_f2cmap`` in current directory, at import time. Make the file name customizable by adding a ``--f2cmap`` command line option, and postpone loading the file to f2py.run_main(). Moreover, restore the default type mapping in f2py.run_main() before loading the customizations, so that multiple calls to f2py.run_main() do not interfere with each other. (For example, numpy.distutils calls f2py multiple times in the same process.)
Distutils code needs to run in different temporary directories, probably because they create `_configtest.c` files for compiler detection in the current directory.
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Backport of #15106.
Previously, f2py loaded the type mappings from a file
.f2py_f2cmapin current directory, at import time.
Make the file name customizable by adding a
--f2cmapcommand lineoption, and postpone loading the file to f2py.run_main().
Restore the default type mapping in f2py.run_main() before
loading the customizations, so that multiple calls to f2py.run_main() do
not interfere with each other. (For example, numpy.distutils calls f2py
multiple times in the same process.)
Moreover, add documentation for the
.f2py_f2cmapfile (copypastedfrom the old f2py FAQ on archive.org), and fix a race condition bug in
the f2py test suite which caused the tests to sometimes not be run
when using pytest-xdist.
cc @pearu
Closes: gh-15096