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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
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.
python module: stop using distutils schemes on sufficiently new Debian Since 3.10.3, Debian finally started patching sysconfig with custom paths, instead of just distutils. This means we can now go use that instead. It reduces our reliance on the deprecated distutils module. Partial fix for #7702
2 years ago
#
# We should be using sysconfig, but before 3.10.3, Debian only patches distutils.
# So we may end up falling back.
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
python module: stop using distutils schemes on sufficiently new Debian Since 3.10.3, Debian finally started patching sysconfig with custom paths, instead of just distutils. This means we can now go use that instead. It reduces our reliance on the deprecated distutils module. Partial fix for #7702
2 years ago
def get_install_paths():
if sys.version_info >= (3, 10):
scheme = sysconfig.get_default_scheme()
else:
scheme = sysconfig._get_default_scheme()
if sys.version_info >= (3, 10, 3):
if 'deb_system' in sysconfig.get_scheme_names():
scheme = 'deb_system'
else:
import distutils.command.install
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='')
return paths, install_paths
paths = sysconfig.get_paths(scheme=scheme)
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
empty_vars = {'base': '', 'platbase': '', 'installed_base': ''}
python module: stop using distutils schemes on sufficiently new Debian Since 3.10.3, Debian finally started patching sysconfig with custom paths, instead of just distutils. This means we can now go use that instead. It reduces our reliance on the deprecated distutils module. Partial fix for #7702
2 years ago
install_paths = sysconfig.get_paths(scheme=scheme, vars=empty_vars)
return paths, install_paths
paths, install_paths = get_install_paths()
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
def links_against_libpython():
python module: stop using distutils "link to libpython" probe on recent python On python >=3.8, this information is expected to be encoded in the sysconfig vars. In distutils, it is always necessary to link to libpython on Windows; for posix platforms, it depends on the value of LIBPYTHON (which is the library to link to, possibly the empty string) as generated by configure.ac and embedded into python.pc and python-config.sh, and then coded a second time in the distutils python sources. There are a couple of caveats which have ramifications for Cygwin and Android: - python.pc and python-config.sh disagree with distutils when python is not built shared. In that case, the former act the same as a shared build, while the latter *never* links to libpython - python.pc disagrees with python-config.sh and distutils when python is built shared. The former never links to libpython, while the latter do The disagreement is resolved in favor of distutils' behavior in all cases, and python.pc is correct for our purposes on python 3.12; see: https://github.com/python/cpython/pull/100356 https://github.com/python/cpython/pull/100967 Although it was not backported to older releases, Cygwin at least has always patched in a fix for python.pc, which behavior is now declared canonical. We can reliably assume it is always correct. This is the other half of the fix for #7702
2 years ago
# on versions supporting python-embed.pc, this is the non-embed lib
#
# PyPy is not yet up to 3.12 and work is still pending to export the
# relevant information (it doesn't automatically provide arbitrary
# Makefile vars)
if sys.version_info >= (3, 8) and not is_pypy:
variables = sysconfig.get_config_vars()
return bool(variables.get('LIBPYTHON', 'yes'))
else:
from distutils.core import Distribution, Extension
cmd = Distribution().get_command_obj('build_ext')
cmd.ensure_finalized()
return bool(cmd.get_libraries(Extension('dummy', [])))
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
variables = sysconfig.get_config_vars()
variables.update({'base_prefix': getattr(sys, 'base_prefix', sys.prefix)})
python module: refactor pypy detection into a consistent variable
1 year ago
is_pypy = '__pypy__' in sys.builtin_module_names
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
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
python module: refactor pypy detection into a consistent variable
1 year ago
if is_pypy:
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 = suffix
Add support for detecting free-threaded Python on Windows This does a couple of things: 1. Scrape the `Py_GIL_DISABLED` sysconfig var, which is the best way as of today to determine whether the target interpreter was built with `--disable-gil` 2. link against the correct libpython 3. On Windows, work around a known issue in the python.org installer with a missing define in `pyconfig.h`, which the CPython devs have said is unlikely to be fixed since headers are shared between the regular and free-threaded builds in a single NSIS installer.
6 months ago
# Whether we're targeting a free-threaded CPython interpreter
is_freethreaded = bool(variables.get('Py_GIL_DISABLED', False))
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(),
python module: refactor pypy detection into a consistent variable
1 year ago
'is_pypy': is_pypy,
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
'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,
Add support for detecting free-threaded Python on Windows This does a couple of things: 1. Scrape the `Py_GIL_DISABLED` sysconfig var, which is the best way as of today to determine whether the target interpreter was built with `--disable-gil` 2. link against the correct libpython 3. On Windows, work around a known issue in the python.org installer with a missing define in `pyconfig.h`, which the CPython devs have said is unlikely to be fixed since headers are shared between the regular and free-threaded builds in a single NSIS installer.
6 months ago
'is_freethreaded': is_freethreaded,
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
}))