[cfe-dev] Attributes and redeclarations

[Jordan Rose via cfe-dev]

Hi, all. Michael Ilseman and I were working with the Clang AST (for Swift purposes) and wanted to check something about the behavior of attributes and redeclarations: are they supposed to be propagated forward, so that the most recent declaration has all of the attributes? Or copied back onto the canonical declaration? I have a vague memory that this is the case for function declarations, but the case we care about (today) is redeclarations of typedefs, and it doesn't seem to be occurring there.

typedef int WrappedInt;
typedef int WrappedInt __attribute__((swift_wrapper(struct)));
typedef int WrappedInt;

Thanks,
Jordan