f2py is a somewhat fragile submodule of Numpy that we do not generally recommend. f2py works with legacy Fortran 77 code, but generally does not work with modern Fortran code. Projects should carefully consider alternative approaches to f2py, such as a command-line + file interface with Python.
If experiencing compiler errors when using f2py, a last resort workaround is finding another computer that the install works on, of the same operating system. This can work on Windows or Linux from a computer of the same operating system and compiler ABI.
On the “donor” working computer:
python setup.py bdist_wheel
This creates mypkg/dist/mypkg-x.y.z-cp3x-cp3xm-win_amd64.whl (similar for other OS). This can only be used on Python 3.x (as per the filename) and the same CPU architecture.
python setup.py develop
This creates mypkg/src/mypkgy/fortranmodule.cp3x-win_amd64.pyd
Both of those files are copied from the “donor” computer to the “recipient” computer. The *.pyd file is placed or soft-linked to the Python current working directory. The *.whl file is one-time installed by:
python -m pip install mypkg-x.y.z-cp3x-cp3xm-win_amd64.whl