test with meson ld error

[baugetfa]

I tried the meson.build tested by @thomasarsouze known to not work:

project('PyRATP', 'fortran',
  version : '0.1',
  default_options : ['warning_level=3'])

sources = files([
  'src/f90/mod_Cocnstant_ValuesF2PY.f90',
  'src/f90/mod_Grid3DF2PY_64bit.f90',
  'src/f90/mod_SkyvaultF2PY.f90',
  'src/f90/mod_Vegetation_TypesF2PY.f90',
  'src/f90/mod_Dir_InterceptionF2PY.f90',
  'src/f90/mod_Hemi_InterceptionF2PY.f90',
  'src/f90/mod_MicrometeoF2PY.f90',
  'src/f90/mod_Shortwave_BalanceF2PY.f90',
  'src/f90/mod_Energy_BalanceF2PY.f90',
  'src/f90/mod_PhotosynthesisF2PY.f90',
  'src/f90/mod_MinerPhenoF2PY.f90',
  'src/f90/prog_RATP.f90'
])

executable('PyRATP', sources, install : true)

I got the error

/home/bauget/miniconda3/envs/pyratp/bin/../lib/gcc/x86_64-conda-linux-gnu/13.3.0/../../../../x86_64-conda-linux-gnu/bin/ld: /home/bauget/miniconda3/envs/pyratp/bin/../x86_64-conda-linux-gnu/sysroot/usr/lib/../lib/Scrt1.o: in function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

But I got exactly the same error with a very simple case that can be found here

[baugetfa]

Well it seems that a main.f90 is simply missing.

[pradal]

I think that we do not want a main function. We want a library. I think that the 'src/f90/prog_RATP.f90' is not needed.
The main will be written in Python

[baugetfa]

With commit e820ed8 I added a main.f90 and command:

meson compile -C builddir

finishes with Linking target PyRATP but I got an executable not library.

[baugetfa]

@pradal I saw your comment when I finished my. Ok. But I think 'src/f90/prog_RATP.f90' is needed. I realize that in the meson.build we ask for an executable.

[pradal]

There are missing parts:
Look rather at https://numpy.org/doc/stable/f2py/buildtools/meson.html

project('pyratp', 'c',
  version : '0.1',
  license: 'BSD-3',
  meson_version: '>=0.64.0',
  default_options : ['warning_level=2'],
)

add_languages('fortran')

py_mod = import('python')
py = py_mod.find_installation(pure: false)
py_dep = py.dependency()

incdir_numpy = run_command(py,
  ['-c', 'import os; os.chdir(".."); import numpy; print(numpy.get_include())'],
  check : true
).stdout().strip()

incdir_f2py = run_command(py,
    ['-c', 'import os; os.chdir(".."); import numpy.f2py; print(numpy.f2py.get_include())'],
    check : true
).stdout().strip()

inc_np = include_directories(incdir_numpy, incdir_f2py)

py.extension_module('xxx',
  [
    'xxx.f90',
    'pyratpmodule.c',  # note: this assumes f2py was manually run before!
  ],
  incdir_f2py / 'fortranobject.c',
  include_directories: inc_np,
  dependencies : py_dep,
  install : true
)

[pradal]

You use

executable('PyRATP', sources, install : true)

And we need

extension_module('PyRATP', sources, install : true)

[baugetfa]

Yes I am on it. I tried other thing. I am currently at the AGAP AG, I have to present myself.

[baugetfa]

I tried things like that without success:

project('PyRATP', 'fortran',
  version : '0.1',
  default_options : ['warning_level=3'])

py_mod = import('python').find_installation()

subdir('src/f90')

sources = files([
  'mod_Cocnstant_ValuesF2PY.f90',
  'mod_Grid3DF2PY_64bit.f90',
  'mod_SkyvaultF2PY.f90',
  'mod_Vegetation_TypesF2PY.f90',
  'mod_Dir_InterceptionF2PY.f90',
  'mod_Hemi_InterceptionF2PY.f90',
  'mod_MicrometeoF2PY.f90',
  'mod_Shortwave_BalanceF2PY.f90',
  'mod_Energy_BalanceF2PY.f90',
  'mod_PhotosynthesisF2PY.f90',
  'mod_MinerPhenoF2PY.f90',
  'mod_prog_RATP.f90'
])

py_mod = import('python').find_installation()

f2py_module = custom_target('pyratp',
  output: 'pyratp.so',
  input: sources,
  command: [py_mod, '-m', 'numpy.f2py', '-c', '-m', 'pyratp', '@INPUT@'],
  install: true,
  install_dir: py_mod.get_install_dir()
)

[pradal]

Once you will have finished the AG, you can look at :
https://github.com/openalea-incubator/PyRATP/blob/master/conda/build.sh

I will look at examples on guthub and send you the solution.

What I recommend is

1. test the example without any complexity (f2py example)
2. look at other examples using f2py
3. try to build pyratp step by step (I will even recommend to rename pyratp nito ratp)