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[Alexandre Courbot]

> hello,
>   I want to do some source program analysis on the AST tree generated by
> gcc , so I want that gcc could shortcut following work after having
> generated AST tree.I don't how to do , could you help me ? thanks !        
>    liu.w.w

Hi,

Not exactly what you asked for, but GCC-XML is maybe what you need:
http://www.gccxml.org

Otherwise, the GCC site is full of useful documentation regarding gcc 
customisation:
http://gcc.gnu.org/onlinedocs/

Alex.