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GeezerVison is showing github.com — fix: linking error building `_testcapi` in Python 3.12 #434 by Andrej730 · Pull Request #435 · python-cmake-buildsystem/python-cmake-buildsystem

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@Andrej730

@Andrej730 Andrej730 commented Dec 6, 2025 •
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Resolves #434.

In 3.12 _testcapi now had a file with Py_LIMITED_API so it was requiring python3.lib to link.

https://github.com/python/cpython/blob/3.12/Modules/_testcapi/heaptype_relative.c

Though issue is resolved, it might be still worth investigating why CI didn't catched that error.

@jcfr

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@Andrej730
Andrej730 force-pushed the fix-linking-_testcapi branch from 777576c to 31e8fa1 Compare December 6, 2025 16:47
@Andrej730

Andrej730 commented Dec 6, 2025

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Error seems unrelated to the change. I've force pushed the branch with the same commit and now 3.9.22 failed, though previously 3.8.20 was failing.
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Andrej730 added 3 commits April 9, 2026 01:35
@Andrej730
fix: linking error building _testcapi in Python 3.12
a1465eb
@Andrej730
Define Py_LIMITED_API only for 3.12
d89bf2b
@Andrej730
Remove TODO in the note
1f6a6a7
@Andrej730
Andrej730 force-pushed the fix-linking-_testcapi branch from 31e8fa1 to 1f6a6a7 Compare April 8, 2026 20:35
@Andrej730

Andrej730 commented Apr 8, 2026

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@jcfr can you please take a look?
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Linking error building with BUILD_LIBPYTHON_SHARED=ON - cannot open file 'python3.lib'

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@Andrej730
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