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setup_build.py
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setup_build.py
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#!/usr/bin/env python3
"""
Implements a custom Distutils build_ext replacement, which handles the
full extension module build process, from api_gen to C compilation and
linking.
"""
try:
from setuptools import Extension
except ImportError:
from distutils.extension import Extension
from distutils.command.build_ext import build_ext
import sys
import os
import os.path as op
from pathlib import Path
import api_gen
from setup_configure import BuildConfig
def localpath(*args):
return op.abspath(op.join(op.dirname(__file__), *args))
MODULES = ['defs', '_errors', '_objects', '_proxy', 'h5fd', 'h5z',
'h5', 'h5i', 'h5r', 'utils', '_selector',
'_conv', 'h5t', 'h5s',
'h5p',
'h5d', 'h5a', 'h5f', 'h5g',
'h5l', 'h5o',
'h5ds', 'h5ac',
'h5pl']
COMPILER_SETTINGS = {
'libraries' : ['hdf5', 'hdf5_hl'],
'include_dirs' : [localpath('lzf')],
'library_dirs' : [],
'define_macros' : [('H5_USE_18_API', None),
('NPY_NO_DEPRECATED_API', 0),
]
}
EXTRA_SRC = {'h5z': [ localpath("lzf/lzf_filter.c") ]}
# Set the environment variable H5PY_SYSTEM_LZF=1 if we want to
# use the system lzf library
if os.environ.get('H5PY_SYSTEM_LZF', '0') == '1':
EXTRA_LIBRARIES = {
'h5z': [ 'lzf' ]
}
else:
COMPILER_SETTINGS['include_dirs'] += [localpath('lzf/lzf')]
EXTRA_SRC['h5z'] += [localpath("lzf/lzf/lzf_c.c"),
localpath("lzf/lzf/lzf_d.c")]
EXTRA_LIBRARIES = {}
if sys.platform.startswith('win'):
COMPILER_SETTINGS['include_dirs'].append(localpath('windows'))
COMPILER_SETTINGS['define_macros'].extend([
('_HDF5USEDLL_', None),
('H5_BUILT_AS_DYNAMIC_LIB', None)
])
class h5py_build_ext(build_ext):
"""
Custom distutils command which encapsulates api_gen pre-building,
Cython building, and C compilation.
Also handles making the Extension modules, since we can't rely on
NumPy being present in the main body of the setup script.
"""
@staticmethod
def _make_extensions(config):
""" Produce a list of Extension instances which can be passed to
cythonize().
This is the point at which custom directories, MPI options, etc.
enter the build process.
"""
import numpy
settings = COMPILER_SETTINGS.copy()
settings['include_dirs'][:0] = config.hdf5_includedirs
settings['library_dirs'][:0] = config.hdf5_libdirs
settings['define_macros'].extend(config.hdf5_define_macros)
try:
numpy_includes = numpy.get_include()
except AttributeError:
# if numpy is not installed get the headers from the .egg directory
import numpy.core
numpy_includes = os.path.join(os.path.dirname(numpy.core.__file__), 'include')
settings['include_dirs'] += [numpy_includes]
if config.mpi:
import mpi4py
settings['include_dirs'] += [mpi4py.get_include()]
# TODO: should this only be done on UNIX?
if os.name != 'nt':
settings['runtime_library_dirs'] = settings['library_dirs']
def make_extension(module):
sources = [localpath('h5py', module + '.pyx')] + EXTRA_SRC.get(module, [])
settings['libraries'] += EXTRA_LIBRARIES.get(module, [])
return Extension('h5py.' + module, sources, **settings)
return [make_extension(m) for m in MODULES]
def run(self):
""" Distutils calls this method to run the command """
from Cython import __version__ as cython_version
from Cython.Build import cythonize
import numpy
complex256_support = hasattr(numpy, 'complex256') and \
os.environ.get('CIBW_ARCHS_MACOS') != 'arm64'
# This allows ccache to recognise the files when pip builds in a temp
# directory. It speeds up repeatedly running tests through tox with
# ccache configured (CC="ccache gcc"). It should have no effect if
# ccache is not in use.
os.environ['CCACHE_BASEDIR'] = op.dirname(op.abspath(__file__))
os.environ['CCACHE_NOHASHDIR'] = '1'
# Get configuration from environment variables
config = BuildConfig.from_env()
config.summarise()
defs_file = localpath('h5py', 'defs.pyx')
func_file = localpath('h5py', 'api_functions.txt')
config_file = localpath('h5py', 'config.pxi')
# Rebuild low-level defs if missing or stale
if not op.isfile(defs_file) or os.stat(func_file).st_mtime > os.stat(defs_file).st_mtime:
print("Executing api_gen rebuild of defs")
api_gen.run()
# Rewrite config.pxi file if needed
s = f"""\
# This file is automatically generated by the h5py setup script. Don't modify.
DEF MPI = {bool(config.mpi)}
DEF ROS3 = {bool(config.ros3)}
DEF HDF5_VERSION = {config.hdf5_version}
DEF DIRECT_VFD = {bool(config.direct_vfd)}
DEF SWMR_MIN_HDF5_VERSION = (1,9,178)
DEF VDS_MIN_HDF5_VERSION = (1,9,233)
DEF VOL_MIN_HDF5_VERSION = (1,11,5)
DEF COMPLEX256_SUPPORT = {complex256_support}
DEF NUMPY_BUILD_VERSION = '{numpy.__version__}'
DEF CYTHON_BUILD_VERSION = '{cython_version}'
"""
write_if_changed(config_file, s)
# Run Cython
print("Executing cythonize()")
self.extensions = cythonize(self._make_extensions(config),
force=config.changed() or self.force,
language_level=3)
# Perform the build
build_ext.run(self)
# Record the configuration we built
config.record_built()
def write_if_changed(target_path, s: str):
"""Overwrite target_path unless the contents already match s
Avoids changing the mtime when we're just writing the same data.
"""
p = Path(target_path)
b = s.encode('utf-8')
try:
if p.read_bytes() == b:
return
except FileNotFoundError:
pass
p.write_bytes(b)
print(f'Updated {p}')