GeezerVison is showing github.com — gh-136267: Use the target configuration in build-details.json by itamaro · Pull Request #161529 · python/cpython
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itamaro
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Nov 7, 2026
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edited by bedevere-app
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With --with-build-python, generate-build-details.py runs on an interpreter other than the one being built. abi.flags, suffixes.extensions, abi.stable_abi_suffix and supports_isolated_interpreters came from sys and importlib, so they described the build interpreter. This reads them from sysconfig instead. The suffix list is rebuilt the way dynload_shlib.c builds it, and a test checks the result against importlib.machinery.EXTENSION_SUFFIXES on native builds.
Also sets abi.extension_suffix and abi.stable_abi_suffix for static libpython builds. PEP 739 requires them whenever extension modules are supported; they were only emitted with a shared libpython (rust-cross/manylinux-cross#165).
Tested with ./configure --disable-gil --with-build-python=<GIL-enabled debug python> && make build-details.json: the file now has ["t"] and the free-threaded suffix list instead of the build interpreter's ["d"] and its list.
Written with assistance from Claude Fable 5.1
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With --with-build-python, generate-build-details.py runs on a different
interpreter than the one being built. abi.flags, suffixes.extensions,
abi.stable_abi_suffix and supports_isolated_interpreters came from sys and
importlib, so they described the build interpreter. Read them from
sysconfig instead. The extension suffix list is rebuilt the same way
Python/dynload_shlib.c builds it; a test checks that the result matches
importlib.machinery.EXTENSION_SUFFIXES on native builds.
Also set abi.extension_suffix and abi.stable_abi_suffix for static
libpython builds. They were only set with a shared libpython, but
extension modules work either way and PEP 739 requires them.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
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