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🩹 Disable ASan on macOS 14/15 with LLVM/Clang 22+ - #60
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On macOS 14/15, llvm-toolchain links LLVM 22/23 programs against its bundled libc++, but the ASan runtime links against the system libc++. Both load into the test process, objects from one are freed by the other, and ASan aborts at exit (bad-free in std::locale::~locale).
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On macOS 14/15, llvm-toolchain links LLVM 22/23 programs against its bundled
@rpath/libc++.1.dylib, but LLVM's ASan runtime (libclang_rt.asan_osx_dynamic.dylib) links against the system/usr/lib/libc++.1.dylib. Both end up in the test process, and ASan aborts at exit:The tests themselves pass. This broke libhal/v5 CI on
macos-15buildingscatter_spanwith LLVM 23.The existing ASan check now also disables ASan for upstream Clang 22+ on macOS 14/15, exactly where the toolchain bundles libc++. The Clang 20 / macOS 26+ case is unchanged. I ran the check logic over macOS 13.6/14.7/15.5/26/27 with Clang 20/21/22/23 and AppleClang, and it disables ASan only in those two cases.