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BUG: f2py cannot find Fortran Compiler correctly while using flang #22910

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helloworld664 opened this issue Jan 1, 2023 · 1 comment · Fixed by #24532
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BUG: f2py cannot find Fortran Compiler correctly while using flang #22910

helloworld664 opened this issue Jan 1, 2023 · 1 comment · Fixed by #24532
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00 - Bug component: numpy.distutils component: numpy.f2py

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@helloworld664
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helloworld664 commented Jan 1, 2023 •
edited by mattip
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Describe the issue:

When I use flang to compile RTTOV-11.3 with f2py, it will report a compilation ERROR: numpy.distutils.fcompiler.CompilerNotFound. But before the ERROR, it also prints: Found executable /path/to/compiler/bin/flang.

Reproduce the code example:

export FC=flang
f2py -c --help-fcompiler

Error message:

In "Fortran compilers found" part, it will print:

  --fcompiler=gnu95  GNU Fortran 95 compiler (12.0.0)

Actually, "12.0.0" is flang compiler's version, not GNU95's. So if I specify fcompiler as "flang", numpy will raise CompilerNotFound EXCEPTION. So I have to specify fcompiler as "gnu95" to continue to compile RTTOV.

Runtime information:

Found executable /path/to/compiler/bin/flang
Traceback (most recent call last):
  File "/path/to/python3/bin/f2py", line 8, in <module>
    sys.exit(main())
  File "/path/to/python3/lib/python3.6/site-packages/numpy/f2py/f2py2e.py", line 692, in main
    run_compile()
  File "/path/to/python3/lib/python3.6/site-packages/numpy/f2py/f2py2e.py", line 659, in run_compile
    setup(ext_modules=[ext])
  File "/path/to/python3/lib/python3.6/site-packages/numpy/distutils/core.py", line 169, in setup
    return old_setup(**new_attr)
  File "/path/to/python3/lib/python3.6/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/path/to/python3/lib/python3.6/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/path/to/python3/lib/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/path/to/python3/lib/python3.6/site-packages/numpy/distutils/command/build.py", line 40, in run
    old_build.run(self)
  File "/path/to/python3/lib/python3.6/distutils/command/build.py", line 135, in run
    self.run_command(cmd_name)
  File "/path/to/python3/lib/python3.6/distutils/cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "/path/to/python3/lib/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/path/to/python3/lib/python3.6/site-packages/numpy/distutils/command/build_ext.py", line 238, in run
    if fcompiler and fcompiler.get_version():
  File "/path/to/python3/lib/python3.6/site-packages/numpy/distutils/fcompiler/__init__.py", line 428, in get_version
    raise CompilerNotFound()
numpy.distutils.fcompiler.CompilerNotFound
make[1]: *** [Makefile:56: ../.././/lib/rttov_gui_f2py.so] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/path/to/RTTOV-11.3/src/gui'
make: *** [Makefile:163: gui/bin] Error 2

Context for the issue:

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@HaoZeke
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HaoZeke commented Feb 11, 2023 •
edited
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Thanks for the report!

Is flang able to compile a fortran-c project independently? Additionally, distutils is deprecated and adding new compilers is extremely unlikely at this point.

@HaoZeke HaoZeke mentioned this issue Aug 26, 2023
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ENH: meson backend for f2py HaoZeke/numpy
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@mattip @HaoZeke @helloworld664