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Is there a specific reason why all standard attributes are not supported by CMake ? Currently there is only cxx_attribute_deprecated. You can fin the full list here.

In my case I'm interested in [[fallthrough]] because I want to use target_compile_features to let CMake add the correct flags automatically :

target_compile_features(MyTarget PRIVATE cxx_attribute_fallthrough)

This may be related to #16700 (closed) ([[noreturn]] attribute).

I can make the necessary changes to add some of the missing attributes and submit a PR if that's OK for you.