Investigate: free-threaded CPython builds for Android and iOS built by us #163

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1. b-re-w commented on Oct 17, 2026

   

   b-re-w

   on Oct 17, 2026

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   Result: free-threaded CPython 3.15.0 builds for both, through CPython's own Platforms/Android and Platforms/Apple tooling with --disable-gil (workflow build-ft-mobile.yml, #204, #208; docs/platforms/free-threaded-mobile.md).

   • Android aarch64-linux-android: run 39013371415, prefix/lib/libpython3.15t.so, pyconfig.h has #define Py_GIL_DISABLED 1. sha256 40995c530c3e454d829b4fdea8404d8c0b0e58f60c2d41d400daa1fb0ab65991 (python-3.15.0-aarch64-linux-android.tar.gz).
   • iOS XCframework (ios-arm64, ios-arm64_x86_64-simulator): run 39014667720, libpython3.15t.dylib per slice, lib/python3.15t, Py_GIL_DISABLED checked in each pyconfig-.h. Two packaging patches for the t suffix (version_tag, testbed grep). sha256 b8c0a4b32d31738f6ead7ace28acee0cb2a590bd0ca7015e9c32af613445e6b5 (python-3.15.0-iOS-XCframework.tar.gz).

   Not verified yet: running on a device, emulator or simulator; loading through the Gradle plugin's PYTHONHOME staging. Artifacts expire after 90 days; a stable download location is pending a decision.
2. b-re-w commented on Oct 25, 2026

   

   b-re-w

   on Oct 25, 2026

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   Conclusion (from existing builds and the release; no new build):

   • Android arm64: works (builds). CPython 3.15.0 with --disable-gil through Platforms/Android: job 'Android aarch64 (free-threaded)' succeeded in run 39013371415 (a8f88b1; the run's overall 'failure' is its iOS job, fixed in the next run). The log shows sysconfig[Py_GIL_DISABLED]: 1 and the libpython3.15t.so link with NDK 27.3 (aarch64-linux-android24-clang). Published as python-3.15.0t-aarch64-linux-android.tar.gz, sha256 40995c530c3e454d829b4fdea8404d8c0b0e58f60c2d41d400daa1fb0ab65991.
   • iOS arm64 (+ arm64/x86_64 simulator): works (builds). Through Platforms/Apple with two packaging patches for the t suffix: run 39014667720 (9ee0af6) succeeded. The log shows sysconfig[Py_GIL_DISABLED]: 1 and libpython3.15t.dylib per slice (arm64-iphoneos, arm64-iphonesimulator). Published as python-3.15.0t-iOS-XCframework.tar.gz, sha256 b8c0a4b32d31738f6ead7ace28acee0cb2a590bd0ca7015e9c32af613445e6b5.
   • Stable location: release cpython-3.15.0t-mobile (https://github.com/thisisthepy/python-multiplatform/releases/tag/cpython-3.15.0t-mobile), so the 90-day artifact expiry no longer matters.

   Not covered by this investigation (no product change was in scope): running either build on a device, emulator or simulator, and loading it through the Gradle plugin's PYTHONHOME staging. The default on mobile stays GIL.
3. b-re-w commented on Oct 25, 2026

   

   b-re-w

   on Oct 25, 2026

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   Closed with the written result above (builds work for Android arm64 and iOS arm64; runtime on device/simulator not verified).
4. b-re-w

   closed this as completedon Oct 25, 2026