Incompatible pointer types passing in _Generic macro

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This is not a bug in clang, but unfortunately what the C11 standard requires. All branches of a _Generic primary expression must be a valid expressions, and thus valid under all circumstances. The fact that only one of the branches will ever be evaluated, is not related to this.

Your alternative version is what C11 foresees for situations as this: chose the function (and not the evaluated call) as a result of the type generic expression, and apply that function to the arguments.

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