> On 7 Jul 2016, at 14:47, Alexander Barkov <b...@mariadb.org> wrote:

> In our application we need to have two parsers using:
> 
> - the same yylex function (the tokenizer)
> - the same set of terminal symbols (%token)
> - the same YYSTYPE structure (%union)
> 
> but implementing very different syntax rules.

You may have to generate those .yy files by some other means, say M4 or other 
text processing program. I have a vague memory of similar topics discussed 
before, but I not recall the resolution. 



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