[cfe-dev] Question about Decl::isUsed()

[Mikhail Ramalho via cfe-dev]

Hi everyone,

I'm trying to write a tool to remove unused declarations from preprocessed
files but found an odd behaviour when using the Decl::isUsed() call.

It works great with clang::FunctionDecl and clang::ValueDecl, but when I
try to check the flag for clang::TagDecl or clang::TypedefNameDecl, it's
always false, even if it's used in the preprocessed file.

Is that the expected behaviour? I know that there might be problems when
dealing with cross TUs but I have a single preprocessed file and everything
is marked as unused.

Thank you,

-- 

Mikhail Ramalho.
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