Build failure: python3Packages.h5py-mpi

[markuskowa]

python3Packages.h5py-mpi fails to build on nixpkgs master (efd6331). Note that python3Packages.h5py is fine.
The build failure was introduced with h5py's upgrade from 3.11.0 to 3.12.1.
I could trace it back with git bisect to 612942f (#345326).

Steps To Reproduce

Steps to reproduce the behavior:

1. nix-build -A python3Packages.h5py-mpi

Build log

Creating a wheel...
* Getting build dependencies for wheel...
/build/h5py-3.12.1/api_gen.py:78: SyntaxWarning: invalid escape sequence '\.'
  PATTERN = re.compile("""(?P<mpi>(MPI)[ ]+)?
/build/h5py-3.12.1/api_gen.py:91: SyntaxWarning: invalid escape sequence '\*'
  SIG_PATTERN = re.compile("""
/build/h5py-3.12.1/setup_configure.py:48: SyntaxWarning: invalid escape sequence '\d'
  m = re.match('(\d+)\.(\d+)\.(\d+)(?:\.\d+)?$', s)

ERROR Missing dependencies:
        mpi4py==3.1.6; python_version >= "3.12"

Additional context

Add any other context about the problem here.

Notify maintainers

CC @doronbehar

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[doronbehar]

That re.match issue is an upstream issue, but not really harmful. The fix was easy #353635 .