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The Meson Build System http://mesonbuild.com/
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meson/mesonbuild/scripts/python_info.py

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python module: move the introspection script into an external script We write this out as an embedded string to a tempfile in order to run it, which is pretty awkward. And usually Meson's files are already files on disk, not packed into a zip, so we can simply run it directly. Since python 3.7, which is our new minimum, we can handle this well via the stdlib. (There's also mesonbuild.mesondata, but we do not need persistence in the builddir.) This also solves the problem that has always been there, of giant python programs inside strings occasionally confusing syntax highlighters. Or even, it would be nice if we had syntax highlighting for this introspection program. :D
2 years ago
#!/usr/bin/env python
# ignore all lints for this file, since it is run by python2 as well
# type: ignore
# pylint: disable=deprecated-module
import sys
work around circular imports in python probe script It seems this happens because at some point setuptools imports gettext, and we have a script by the same name. In general, this path injection by default is bad news for our use case. Python 3.11 introduced -P for this reason, but we cannot depend on that. Instead, check for it first, and delete it, before doing more imports.
2 years ago
# do not inject mesonbuild.scripts
# python -P would work too, but is exclusive to >=3.11
if sys.path[0].endswith('scripts'):
del sys.path[0]
import json, os, sysconfig
python module: move the introspection script into an external script We write this out as an embedded string to a tempfile in order to run it, which is pretty awkward. And usually Meson's files are already files on disk, not packed into a zip, so we can simply run it directly. Since python 3.7, which is our new minimum, we can handle this well via the stdlib. (There's also mesonbuild.mesondata, but we do not need persistence in the builddir.) This also solves the problem that has always been there, of giant python programs inside strings occasionally confusing syntax highlighters. Or even, it would be nice if we had syntax highlighting for this introspection program. :D
2 years ago
import distutils.command.install
def get_distutils_paths(scheme=None, prefix=None):
import distutils.dist
distribution = distutils.dist.Distribution()
install_cmd = distribution.get_command_obj('install')
if prefix is not None:
install_cmd.prefix = prefix
if scheme:
install_cmd.select_scheme(scheme)
install_cmd.finalize_options()
return {
'data': install_cmd.install_data,
'include': os.path.dirname(install_cmd.install_headers),
'platlib': install_cmd.install_platlib,
'purelib': install_cmd.install_purelib,
'scripts': install_cmd.install_scripts,
}
# On Debian derivatives, the Python interpreter shipped by the distribution uses
# a custom install scheme, deb_system, for the system install, and changes the
# default scheme to a custom one pointing to /usr/local and replacing
# site-packages with dist-packages.
# See https://github.com/mesonbuild/meson/issues/8739.
# XXX: We should be using sysconfig, but Debian only patches distutils.
if 'deb_system' in distutils.command.install.INSTALL_SCHEMES:
paths = get_distutils_paths(scheme='deb_system')
install_paths = get_distutils_paths(scheme='deb_system', prefix='')
else:
paths = sysconfig.get_paths()
empty_vars = {'base': '', 'platbase': '', 'installed_base': ''}
install_paths = sysconfig.get_paths(vars=empty_vars)
def links_against_libpython():
from distutils.core import Distribution, Extension
cmd = Distribution().get_command_obj('build_ext')
cmd.ensure_finalized()
return bool(cmd.get_libraries(Extension('dummy', [])))
variables = sysconfig.get_config_vars()
variables.update({'base_prefix': getattr(sys, 'base_prefix', sys.prefix)})
if sys.version_info < (3, 0):
suffix = variables.get('SO')
elif sys.version_info < (3, 8, 7):
# https://bugs.python.org/issue?@action=redirect&bpo=39825
from distutils.sysconfig import get_config_var
suffix = get_config_var('EXT_SUFFIX')
else:
suffix = variables.get('EXT_SUFFIX')
Python: Add 'limited_api' kwarg to extension_module This commit adds a new keyword arg to extension_module() that enables a user to target the Python Limited API, declaring the version of the limited API that they wish to target. Two new unittests have been added to test this functionality.
2 years ago
limited_api_suffix = None
if sys.version_info >= (3, 2):
try:
from importlib.machinery import EXTENSION_SUFFIXES
limited_api_suffix = EXTENSION_SUFFIXES[1]
except Exception:
pass
# pypy supports modules targetting the limited api but
# does not use a special suffix to distinguish them:
# https://doc.pypy.org/en/latest/cpython_differences.html#permitted-abi-tags-in-extensions
if '__pypy__' in sys.builtin_module_names:
limited_api_suffix = suffix
python module: move the introspection script into an external script We write this out as an embedded string to a tempfile in order to run it, which is pretty awkward. And usually Meson's files are already files on disk, not packed into a zip, so we can simply run it directly. Since python 3.7, which is our new minimum, we can handle this well via the stdlib. (There's also mesonbuild.mesondata, but we do not need persistence in the builddir.) This also solves the problem that has always been there, of giant python programs inside strings occasionally confusing syntax highlighters. Or even, it would be nice if we had syntax highlighting for this introspection program. :D
2 years ago
print(json.dumps({
'variables': variables,
'paths': paths,
'sysconfig_paths': sysconfig.get_paths(),
'install_paths': install_paths,
'version': sysconfig.get_python_version(),
'platform': sysconfig.get_platform(),
'is_pypy': '__pypy__' in sys.builtin_module_names,
'is_venv': sys.prefix != variables['base_prefix'],
'link_libpython': links_against_libpython(),
'suffix': suffix,
Python: Add 'limited_api' kwarg to extension_module This commit adds a new keyword arg to extension_module() that enables a user to target the Python Limited API, declaring the version of the limited API that they wish to target. Two new unittests have been added to test this functionality.
2 years ago
'limited_api_suffix': limited_api_suffix,
python module: move the introspection script into an external script We write this out as an embedded string to a tempfile in order to run it, which is pretty awkward. And usually Meson's files are already files on disk, not packed into a zip, so we can simply run it directly. Since python 3.7, which is our new minimum, we can handle this well via the stdlib. (There's also mesonbuild.mesondata, but we do not need persistence in the builddir.) This also solves the problem that has always been there, of giant python programs inside strings occasionally confusing syntax highlighters. Or even, it would be nice if we had syntax highlighting for this introspection program. :D
2 years ago
}))