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gh-149800: Fix macOS universal2 build of perf trampoline by eendebakpt · Pull Request #150365 · python/cpython · GitHub

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gh-149800: Fix macOS universal2 build of perf trampoline #150365

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gh-149800: Fix macOS universal2 build of perf trampoline #150365

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gh-149800: Fix macOS universal2 build of perf trampoline
eendebakpt May 24, 2026
1ddf61b
Merge branch 'main' into fix-universal2-trampoline
eendebakpt May 24, 2026
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7 changes: 6 additions & 1 deletion Makefile.pre.in
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Original file line number Diff line number Diff line change
Expand Up @@ -3120,8 +3120,13 @@ Python/asm_trampoline_aarch64.o: $(srcdir)/Python/asm_trampoline_aarch64.S
Python/asm_trampoline_riscv64.o: $(srcdir)/Python/asm_trampoline_riscv64.S
$(CC) -c $(PY_CORE_CFLAGS) -o $@ $<

# Extract the matching slice from each fat per-arch object before lipo -create,
# which rejects two fat inputs that share architectures.
Python/asm_trampoline_universal2.o: Python/asm_trampoline_aarch64.o Python/asm_trampoline_x86_64.o
lipo -create -output $@ Python/asm_trampoline_aarch64.o Python/asm_trampoline_x86_64.o
lipo -thin arm64 Python/asm_trampoline_aarch64.o -output $@.arm64
lipo -thin x86_64 Python/asm_trampoline_x86_64.o -output $@.x86_64
lipo -create -output $@ $@.arm64 $@.x86_64
rm -f $@.arm64 $@.x86_64

Python/emscripten_trampoline_inner.wasm: $(srcdir)/Python/emscripten_trampoline_inner.c
# emcc has a path that ends with emsdk/upstream/emscripten/emcc, we're looking for emsdk/upstream/bin/clang.
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Build/2026-05-24-19-24-28.gh-issue-149800.Mq994d.rst
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@@ -0,0 +1,3 @@
Fix macOS universal2 build of the perf trampoline. After the per-architecture
split in :gh:`149800`, the ``arm64`` and ``x86_64`` trampoline objects were
each compiled as fat Mach-O files, and ``lipo -create`` refused to merge them.
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