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gh-115382: Fix cross compiles when host and target use same SOABI

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Co-authored-by: Erlend E. Aasland <erlend@python.org>
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Vincent Fazio 2024-10-16 17:01:42 -05:00 • committed by GitHub
parent aab3210271
commit aecbc2e6f4
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6 changed files with 19 additions and 3 deletions
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15
Lib/sysconfig/__init__.py
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@ -340,7 +340,20 @@ def _init_posix(vars):
"""Initialize the module as appropriate for POSIX systems."""
# _sysconfigdata is generated at build time, see _generate_posix_vars()
name = _get_sysconfigdata_name()
_temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)
# For cross builds, the path to the target's sysconfigdata must be specified
# so it can be imported. It cannot be in PYTHONPATH, as foreign modules in
# sys.path can cause crashes when loaded by the host interpreter.
# Rely on truthiness as a valueless env variable is still an empty string.
# See OS X note in _generate_posix_vars re _sysconfigdata.
if (path := os.environ.get('_PYTHON_SYSCONFIGDATA_PATH')):
from importlib.machinery import FileFinder, SourceFileLoader, SOURCE_SUFFIXES
from importlib.util import module_from_spec
spec = FileFinder(path, (SourceFileLoader, SOURCE_SUFFIXES)).find_spec(name)
_temp = module_from_spec(spec)
spec.loader.exec_module(_temp)
else:
_temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)
build_time_vars = _temp.build_time_vars
vars.update(build_time_vars)