ci-macos: the raw compiles use the SDK mcpp selects (xcode-27 image 20260912) - #665
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xcode-27-arm64 20260912 updated the Command Line Tools SDK, whose .tbd stubs list arm64e.x1. ld64.lld 22.1.8 does not parse that architecture (support landed upstream in llvm-project#222721, after 22.1.8), and the raw compiles in this job took the SDK from the xlings LLVM package's clang++.cfg, which names the Command Line Tools SDK. mcpp itself passes --no-default-config and uses xcrun --show-sdk-path, and the mcpp e2e suite on the same image is green. The raw compiles now state -isysroot from xcrun, so the job measures what mcpp builds.
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main went red after #664 merged, in one job only: ci-macos, macOS ARM64 xlings LLVM end-to-end (xcode-27). The runner image moved from xcode-27-arm64 20260907 (green) to 20260912, whose Command Line Tools SDK lists
arm64e.x1in its .tbd stubs; ld64.lld 22.1.8 cannot parse it (upstream support: llvm-project#222721, after 22.1.8). The raw compiles in this job take--sysrootfrom the xlings LLVM package's clang++.cfg, which names the Command Line Tools SDK. mcpp passes --no-default-config and usesxcrun --show-sdk-path; the mcpp e2e suite on the same image (ci-macos-e2e, xcode-27) is green. The raw compiles now state-isysroot $(xcrun --show-sdk-path).Follow-up outside this PR: the xlings LLVM package's clang++.cfg names the Command Line Tools SDK, which lld 22.1.8 cannot link against on macOS 27 until an LLVM carrying #222721 is packaged.