Describe the issue:

I'm having an issue trying to build a code using f2py with meson (aka Python 3.12). To wit, I have an f2py code that depends on a library libMAPL.base.so. When I try and use f2py with it, I get this error from Meson:

The Meson build system
Version: 1.4.1
Source dir: /tmp/tmpzxxmb51m
Build dir: /tmp/tmpzxxmb51m/bbdir
Build type: native build

meson.build:35:10: ERROR: Expecting lparen got assign.
MAPL.base = declare_dependency(link_args : ['-lMAPL.base'])
          ^

I believe the issue is that Meson thinks that MAPL.base is a method of the MAPL object or something? (I do not know Meson.)

You can reproduce this with the code below (saved as qsat_py.F90) running with:

f2py -m qsat_  -lMAPL.base --build-dir ./foo -c qsat_py.F90

Reproduce the code example:

subroutine qsat ( qs, T, p, nobs )
  use MAPL_SatVaporMod, only: MAPL_EQsat

  integer, intent(in) :: nobs
  real,    intent(in) :: p(nobs) ! pressure in Pa
  real,    intent(in) :: T(nobs) ! dry-bulb temperature in K
  real,    intent(out) :: qs(nobs) ! saturation specific humidity
  integer i

  do i = 1, nobs
     qs(i) = MAPL_EQsat(TL=t(i),PL=p(i),OverIce=.True.)
  end do
end subroutine qsat

subroutine qsatnoice ( qs, T, p, nobs )
  use MAPL_SatVaporMod, only: MAPL_EQsat

  integer, intent(in) :: nobs
  real,    intent(in) :: p(nobs) ! pressure in Pa
  real,    intent(in) :: T(nobs) ! dry-bulb temperature in K
  real,    intent(out) :: qs(nobs) ! saturation specific humidity
  integer i

  do i = 1, nobs
     qs(i) = MAPL_EQsat(TL=t(i),PL=p(i),OverIce=.False.)
  end do
end subroutine qsatnoice

Error message:

The Meson build system
Version: 1.4.1
Source dir: /tmp/tmpzxxmb51m
Build dir: /tmp/tmpzxxmb51m/bbdir
Build type: native build

meson.build:35:10: ERROR: Expecting lparen got assign.
MAPL.base = declare_dependency(link_args : ['-lMAPL.base'])
          ^

A full log can be found at /tmp/tmpzxxmb51m/bbdir/meson-logs/meson-log.txt
Traceback (most recent call last):
  File "/usr/local/other/GEOSpyD/24.4.0-0_py3.12/2024-05-31/bin/f2py", line 10, in <module>
    sys.exit(main())
             ^^^^^^
  File "/usr/local/other/GEOSpyD/24.4.0-0_py3.12/2024-05-31/lib/python3.12/site-packages/numpy/f2py/f2py2e.py", line 766, in main
    run_compile()
  File "/usr/local/other/GEOSpyD/24.4.0-0_py3.12/2024-05-31/lib/python3.12/site-packages/numpy/f2py/f2py2e.py", line 738, in run_compile
    builder.compile()
  File "/usr/local/other/GEOSpyD/24.4.0-0_py3.12/2024-05-31/lib/python3.12/site-packages/numpy/f2py/_backends/_meson.py", line 178, in compile
    self.run_meson(self.build_dir)
  File "/usr/local/other/GEOSpyD/24.4.0-0_py3.12/2024-05-31/lib/python3.12/site-packages/numpy/f2py/_backends/_meson.py", line 171, in run_meson
    self._run_subprocess_command(setup_command, build_dir)
  File "/usr/local/other/GEOSpyD/24.4.0-0_py3.12/2024-05-31/lib/python3.12/site-packages/numpy/f2py/_backends/_meson.py", line 167, in _run_subprocess_command
    subprocess.run(command, cwd=cwd, check=True)
  File "/usr/local/other/GEOSpyD/24.4.0-0_py3.12/2024-05-31/lib/python3.12/subprocess.py", line 571, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['meson', 'setup', 'bbdir']' returned non-zero exit status 1.

Python and NumPy Versions:

1.26.4
3.12.2 | packaged by conda-forge | (main, Feb 16 2024, 20:50:58) [GCC 12.3.0]

Runtime Environment:

[{'numpy_version': '1.26.4',
'python': '3.12.2 | packaged by conda-forge | (main, Feb 16 2024, 20:50:58) '
'[GCC 12.3.0]',
'uname': uname_result(system='Linux', node='discover33', release='5.14.21-150400.24.81-default', version='#1 SMP PREEMPT_DYNAMIC Tue Aug 8 14:10:43 UTC 2023 (90a74a8)', machine='x86_64')},
{'simd_extensions': {'baseline': ['SSE', 'SSE2', 'SSE3'],
'found': ['SSSE3',
'SSE41',
'POPCNT',
'SSE42',
'AVX',
'F16C',
'FMA3',
'AVX2'],
'not_found': ['AVX512F',
'AVX512CD',
'AVX512_KNL',
'AVX512_KNM',
'AVX512_SKX',
'AVX512_CLX',
'AVX512_CNL',
'AVX512_ICL',
'AVX512_SPR']}},
{'filepath': '/gpfsm/dulocal15/sles15/other/GEOSpyD/24.4.0-0_py3.12/2024-05-31/lib/libmkl_rt.so.2',
'internal_api': 'mkl',
'num_threads': 1,
'prefix': 'libmkl_rt',
'threading_layer': 'intel',
'user_api': 'blas',
'version': '2023.2-Product'},
{'filepath': '/gpfsm/dulocal15/sles15/other/GEOSpyD/24.4.0-0_py3.12/2024-05-31/lib/libomp.so',
'internal_api': 'openmp',
'num_threads': 1,
'prefix': 'libomp',
'user_api': 'openmp',
'version': None}]

Context for the issue:

We cannot move to Python 3.12 unless we can work around this. Is there someway to have f2py "mangle" the variables it constructs in meson?