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Is there any mechanism to disable this user prompt during development? This completely breaks automated testing setups.

Clang 13 documentation https://clang.llvm.org/docs/ReleaseNotes.html indicates support of [[clang::musttail]] attributes to enforce TCO. Any attempt to use this in xcode13 is is failing on the attribute: warning: unknown attribute 'musttail' ignored [-Wunknown-attributes] [[clang::musttail]] Can I get a confirmation this is actually supported? Clang version in xCode13b4 is reported as: Apple clang version 13.0.0 (clang-1300.0.27.3)