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[3.14] gh-144942: Link $(MODLIBS) into the macOS shared library and framework (GH-159966) - #160160
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…framework (pythonGH-159966) The rules that link `libpython$(LDVERSION).dylib` and the macOS and iOS frameworks don't pass `$(MODLIBS)`, unlike the `libpython$(LDVERSION).so` rule. When a module is built in, for example via `Modules/Setup.local`, the libraries that module needs are left out: - **`--enable-framework`:** the build fails with undefined symbols. - **`--enable-shared`:** the dylib is linked with `-undefined dynamic_lookup`, so the build succeeds and the failure only shows up at runtime. To reproduce, build on macOS with this `Modules/Setup.local`: ``` *static* _blake2 blake2module.c ``` On `main`: - **`--enable-framework`:** linking `Python.framework` fails with 12 undefined `_Py_LibHacl_*` symbols. - **`--enable-shared`:** `nm -u libpython3.16.dylib` lists the same 12 symbols. After `make install`, `python3 -c "import _blake2; _blake2.blake2b(b'abc')"` aborts with `dyld: missing symbol called`, and so does a C program that embeds Python. With this change, both builds link with no undefined HACL symbols, and `_blake2` works as a built-in module. In default builds `$(MODLIBS)` is empty, so they are unaffected. `test_hashlib`, `test_hmac`, `test_embed` and `test_sysconfig` pass for shared and framework builds, both with and without the `Setup.local` above (macOS 14, arm64). I haven't tested the iOS framework rule, which gets the same one-line change. python-build-standalone already carries the dylib part of this as a patch ([astral-sh/python-build-standalone#870](astral-sh/python-build-standalone#870)). This PR doesn't remove `-undefined dynamic_lookup`, as the earlier pythongh-145186 did. (cherry picked from commit 03864a2) Co-authored-by: Itamar Oren <itamarost@gmail.com>
This was referenced Oct 22, 2026
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The rules that link
libpython$(LDVERSION).dyliband the macOS and iOS frameworks don't pass$(MODLIBS), unlike thelibpython$(LDVERSION).sorule. When a module is built in, for example viaModules/Setup.local, the libraries that module needs are left out:--enable-framework: the build fails with undefined symbols.--enable-shared: the dylib is linked with-undefined dynamic_lookup, so the build succeeds and the failure only shows up at runtime.To reproduce, build on macOS with this
Modules/Setup.local:On
main:--enable-framework: linkingPython.frameworkfails with 12 undefined_Py_LibHacl_*symbols.--enable-shared:nm -u libpython3.16.dyliblists the same 12 symbols. Aftermake install,python3 -c "import _blake2; _blake2.blake2b(b'abc')"aborts withdyld: missing symbol called, and so does a C program that embeds Python.With this change, both builds link with no undefined HACL symbols, and
_blake2works as a built-in module. In default builds$(MODLIBS)is empty, so they are unaffected.test_hashlib,test_hmac,test_embedandtest_sysconfigpass for shared and framework builds, both with and without theSetup.localabove (macOS 14, arm64). I haven't tested the iOS framework rule, which gets the same one-line change.python-build-standalone already carries the dylib part of this as a patch (astral-sh/python-build-standalone#870). This PR doesn't remove
-undefined dynamic_lookup, as the earlier gh-145186 did.(cherry picked from commit 03864a2)
Co-authored-by: Itamar Oren itamarost@gmail.com