adding mpicc system path of setup.py

[gthyagi]

Hi,

I've updated the setup.py file to retrieve mpicc from the system-wide installation instead of relying only on the environment installation.

[gthyagi]

#242, issue reported here.

[gthyagi]

The reason for issue #242 is that mpi4py version 4 does not provide the necessary path information when calling get_config(). For more details and potential solutions, please refer to the discussion in this GitHub issue:
mpi4py/mpi4py#532

[julesghub]

@gthyagi, looking at this more it doesn't seem like we need to even use environ["CC"] anywhere. Can you confirm?

If the code is obsolete let's remove it.

[gthyagi]

@julesghub yes, we can remove these lines from the setup.py file.

underworld3/setup.py

Lines 13 to 34 in 372ecce

	if os.environ.get("CC") is None:
	import warnings
	warnings.warn(
	"CC environment variable not set. Using mpi4py's compiler configuration"
	)
	# Get CC from mpi4py
	import mpi4py
	conf = mpi4py.get_config()
	# Check if "mpicc" is in the mpi4py configuration
	if "mpicc" in conf:
	os.environ["CC"] = conf["mpicc"]
	else:
	# Fallback: manually set CC to the path of the mpicc compiler
	mpicc_path = os.popen('which mpicc').read().strip()
	if mpicc_path:
	os.environ["CC"] = mpicc_path
	else:
	raise KeyError("'mpicc' not found in mpi4py configuration, and 'mpicc' not found in system path. "
	"Ensure MPI is installed and 'mpicc' is available.")

[julesghub]

ok, then I'll close this PR and I will make a new one to remove