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gh-149800: Fix macOS universal2 build of perf trampoline - #150365
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eendebakpt wants to merge 2 commits into
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After splitting the perf trampoline into per-architecture .S files,
PY_CORE_CFLAGS still carries `-arch arm64 -arch x86_64` on universal2
builds, so each per-arch object becomes a fat Mach-O whose wrong-arch
slice is empty (thanks to the `#ifdef` guards in the sources). `lipo
-create` then refused to merge two fat inputs sharing both
architectures:
fatal error: lipo: Python/asm_trampoline_aarch64.o and
Python/asm_trampoline_x86_64.o have the same architectures (x86_64)
and can't be in the same fat output file
Extract the matching slice from each per-arch object with `lipo -thin`
before recombining into `asm_trampoline_universal2.o`.
eendebakpt
requested review from
AA-Turner,
emmatyping and
erlend-aasland
as code owners
May 24, 2026 19:34
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Looks like @pablogsal was a couple of minutes ahead of you: duplicate of #150364 |
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Yeah, he beat me by a minute. I'll close this one, his approach is similar to this one. |
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Thanks for jumping on it! |
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Address failing JIT CI, see https://github.com/python/cpython/actions/runs/26343871355/job/77550446716?pr=150324
Claude analysis:
After splitting the perf trampoline into per-architecture .S files in #149894, PY_CORE_CFLAGS still carries -arch arm64 -arch x86_64 on universal2 builds, so each per-arch object becomes a fat Mach-O whose wrong-arch slice is empty (thanks to the #ifdef guards in the sources). lipo -create then refused to merge two fat inputs sharing both architectures:
Extract the matching slice from each per-arch object with lipo -thin before recombining into asm_trampoline_universal2.o.
The PR #149894 passed because it did not trigger jit builds.
Marking as DO-NOT-MERGE until someone can verify the above is correct.