Compiler generators that construct abstract syntax tree

I'm currently using lex & yacc for the construction of a compiler.
I want the parser to generate an abstract syntax tree (AST) in the first
pass. The way I do this is to explicitly add C-code to the productions
of the grammer that construct the AST.


Questions:


Are there any other compiler generators--possibly compatible with yacc-- that
have built in support for the construction of an AST ?


If not, are there any public packages for creating an AST ?


Thank you


Wolfgang


--
Wolfgang Glunz email : wogl@sun11a.zfe.siemens.de
Siemens AG, ZFE BT SE 61
8000 Muenchen 83 / Germany Phone: +49 89 63649492
Otto Hahn Ring 6 Fax: +49 89 63644950
[Doesn't the Cocktail toolkit do that? -John]
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