building a parser with clang

I need to build an AST using clang and the only tutorials that I found are vague and two year开发者_JAVA技巧s out of date. Could anybody point me to an example?

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There are several tutorial available that demonstrate the use of the Preprocessor class and how to build an AST:

• A CLang tutorial (a bit outdated but with a lot of explanation)
• Code samples