Clang AST dump doesn't show #defines

问题

I'm dumping the AST of some headers like this:

clang -cc1 -ast-dump -fblocks header.h

However, any #defines on the header are not showing on the dump. Is there a way of adding them?

回答1:

It's true, #defines are handled by the preprocessor, not the compiler. So you need a preprocessor parser stage. I know of two:

1. Boost Wave can preprocess the input for you, and/or give you hooks to trigger on macro definitions or uses.

2. The Clang tool pp-trace uses a Clang library that can do callbacks on many preprocessor events, including macro definitions.

来源：https://stackoverflow.com/questions/29595807/clang-ast-dump-doesnt-show-defines