On Fri, Aug 26, 2022 at 5:52 PM Johann Rohwer <jr@sun.ac.za> wrote:

Hi all,

First of all, I am not sure if this is the correct forum for f2py-related questions, but since f2py is part of numpy I thought I'd start here. Please point me to the correct place if I am mistaken.

This is the right mailing list indeed. Although f2py knowledge is a bit scarce, and the few people that tend to work actively on f2py are more responsive on GitHub I think. So opening an issue at https://github.com/numpy/numpy/issues may yield a better response. I am trying to port the build system for a python package (GitHub -

PySCeS/pysces: The official PySCeS project source code repository. <http://github.com/PySCeS/pysces>) from numpy.distutils to use scikit-build because of the deprecation of distutils (the package contains 2 Fortran extension modules wrapped with f2py). To get to know the system I’ve started with a minimal example. I have been getting compile failures on Windows (on Linux and macOS everything works).

I have posted this on SO and on the Fortran discourse group but have not had any replies despite quite a number of reads. Perhaps anyone here can help out? Links to the other posts:

- python - f2py compile error with signature file on Windows - Stack Overflow <https://stackoverflow.com/questions/73464905/f2py-compile-error-with-signatu...> - Fortran language discourse group <https://fortran-lang.discourse.group/t/f2py-compile-error-with-full-path-of-...>

Minimal example:

*hi.f*

SUBROUTINE HELLO() PRINT*,"Hello from fortran" END

*hi.pyf*

! -*- f90 -*- ! Note: the context of this file is case sensitive.

python module hi ! in interface ! in :hi subroutine hello ! in :hi:hi.f end subroutine hello end interface end python module hi

! This file was auto-generated with f2py (version:1.23.2). ! See: ! https://web.archive.org/web/20140822061353/http://cens.ioc.ee/projects/f2py2...

During compilation with python setup.py build the build fails. In tracking it down I saw that ninja/cmake expands the full path of the source files and this is where it fails.

It's probably CMake doing that. Ninja is agnostic to that. In SciPy we have .pyf files, but by design Meson writes out the `build.ninja` with only relative paths for anything inside the source tree. So we haven't seen this issue before. That said, I agree that it's still expected to work with absolute paths though, so it looks like an f2py bug. It's probably not super hard to fix for one of the f2py folks with access to a Windows machine. It may take a little while though - but please do open a new issue. Cheers, Ralf To ensure that it is not a problem with the skbuild build system I verified

that the failure can be reproduced on the command line using f2py on its own as follows - copy the Fortran files above to the same folder and then run in a command prompt:

(skbuild) Z:\Documents\Python\skbuild_test\simple\hello\shout>f2py.exe -m hi -c hi.pyf hi.f

(works and generates the .pyd and .dll files)

However, specifying the full path, fails:

(skbuild) Z:\Documents\Python\skbuild_test\simple\hello\shout>f2py.exe -m hi -c Z:/Documents/Python/skbuild_test/simple/hello/shout/hi.pyf Z:/Documents/Python/skbuild_test/simple/hello/shout/hi.frunning buildrunning config_ccINFO: unifing config_cc, config, build_clib, build_ext, build commands --compiler optionsrunning config_fcINFO: unifing config_fc, config, build_clib, build_ext, build commands --fcompiler optionsrunning build_srcINFO: build_srcINFO: building extension "hi" sourcescreating C:creating C:Userscreating C:Users\jrcreating C:Users\jr\AppDatacreating C:Users\jr\AppData\Localcreating C:Users\jr\AppData\Local\Tempcreating C:Users\jr\AppData\Local\Temp\tmpdbudw6jhcreating C:Users\jr\AppData\Local\Temp\tmpdbudw6jh\src.win-amd64-3.10creating C:Users\jr\AppData\Local\Temp\tmpdbudw6jh\src.win-amd64-3.10\Documentscreating C:Users\jr\AppData\Local\Temp\tmpdbudw6jh\src.win-amd64-3.10\Documents\Pythoncreating C:Users\jr\AppData\Local\Temp\tmpdbudw6jh\src.win-amd64-3.10\Documents\Python\skbuild_testcreating C:Users\jr\AppData\Local\Temp\tmpdbudw6jh\src.win-amd64-3.10\Documents\Python\skbuild_test\simplecreating C:Users\jr\AppData\Local\Temp\tmpdbudw6jh\src.win-amd64-3.10\Documents\Python\skbuild_test\simple\hellocreating C:Users\jr\AppData\Local\Temp\tmpdbudw6jh\src.win-amd64-3.10\Documents\Python\skbuild_test\simple\hello\shoutINFO: f2py options: []INFO: f2py: Z:/Documents/Python/skbuild_test/simple/hello/shout/hi.pyferror: [WinError 123] The filename, directory name, or volume label syntax is incorrect: 'C:C:\\Users\\jr\\AppData\\Local\\Temp\\tmpdbudw6jh\\src.win-amd64-3.10\\Documents\\Python\\skbuild_test\\simple\\hello\\shout'

The problem seems to be with the creating C:Users part leading to the malformed filename in the last line.

Specifying only the filename for hi.pyf but the full path for hi.f *does work* strangely enough, but as soon as the full path for hi.pyf is specified it fails. As mentioned, on Linux and macOS all works fine. ------------------------------

*NOTE:* I could of course skip the .pyf file and then it works. However, the Fortran code I’m wrapping is F77 and needs to be redistributed in unmodified form due to licensing conditions, so I do need a custom .pyf file to integrate it into my Python module. ------------------------------

*System*

- Windows 10 64-bit - MSVC 2022 build tools - mingw 11.2.0.07112021 - python 3.10.6 - numpy 1.23.2

I have no idea what is going on here.

Thanks, Johann

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