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PR #396's X2 dry-run caught a wheel-import failure on the manylinux_2_28 floor matrix entry (both x86_64 and aarch64). Same class as #355: ImportError: ... undefined symbol: __libc_single_threaded `__libc_single_threaded` is a single-byte char added in glibc 2.32. Newer libstdc++ (gcc 11+) reads it inside `__cxa_thread_atexit_impl` to elide locking on the single-threaded fast path. ORT prebuilt static archives compiled with gcc-14.2.1 against glibc-2.38+ headers bake in the reference. Users with glibc < 2.32 hit ImportError on `import headroom._core`. Latent since the ORT artifact bump that started using gcc 14. X1 is the gate that catches it at release time; X2 caught it at PR time — exactly as designed. Fix: 1. glibc_compat.c adds Section B: `char __libc_single_threaded = 0;` Setting to 0 (multi-threaded) is safe; libstdc++ takes the locked slow path. Setting to 1 would race in any multithreaded Rust wheel. 2. build.rs adds `-Wl,-u,__libc_single_threaded` so the shim's archive members are pulled regardless of scan order. 3. audit_wheel_glibc_symbols.py POST_FLOOR_SYMBOLS adds the new symbol — verified locally: the audit now rejects the failing PR #396 wheel with the right message. |
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