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Title: gh-145177: Bump emscripten to 5.0.4 by hoodmane · Pull Request #151421 · python/cpython · GitHub

Open Graph Title: gh-145177: Bump emscripten to 5.0.4 by hoodmane · Pull Request #151421 · python/cpython

X Title: gh-145177: Bump emscripten to 5.0.4 by hoodmane · Pull Request #151421 · python/cpython

Description: Before Emscripten 4.0.19, there was a bug in the dynamic loader that caused any dynamic library that links libffi to fail to load. _ctypes_test.so unnecessarily links libffi so it would fail to load and tests that needed it were skipped. There are two test failures behind that: one involving stack overflows which we have to skip as usual, and one that assumes that the abi for a function that takes a single struct with two doubles is the same as the abi for a function that takes two double arguments. This is not true in webassembly so we skip the test. There is another regression in Emscripten 5.0.5 which breaks a couple tests in test_secrets and test_random, so I'm leaving updating past that to a followup. Ideally #151423 should merge before this. Issue: gh-145177

Open Graph Description: Before Emscripten 4.0.19, there was a bug in the dynamic loader that caused any dynamic library that links libffi to fail to load. _ctypes_test.so unnecessarily links libffi so it would fail to loa...

X Description: Before Emscripten 4.0.19, there was a bug in the dynamic loader that caused any dynamic library that links libffi to fail to load. _ctypes_test.so unnecessarily links libffi so it would fail to loa...

Opengraph URL: https://github.com/python/cpython/pull/151421

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751d80f gh-145177: Bump emscripten to 5.0.4 hoodmane Jun 12, 2026 https://github.com/python/cpython/pull/151421/commits/751d80f7a6520b3f63224b7b5a2648adf046e88e
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