LEX / YACC - extension of yacc and lex files with additional rules and definitions

Hello, I am new to UNIX and its tools lex and yacc. What I like to do
is having a main yacc file which can be extended with additional
definitions and rules in an add-on yacc file via something like a
"yacc-include". I guess yacc has no preprocessor like a C compiler and
probably therefore cannot do somehing like %include "add_rules.y". The
book I have doesn't mention something of use. Does somebody know if
lex and yacc have the possibility to do this or if there is a
workaround?


If somebody knows lex and yacc good enough to say - there is
definitely no intern possibility - please let me know too.


Lex / yacc and flex / bison are said to be compatible, but do the
Linux programms probably have the functionality to do this if lex and
yacc do not?


Thankyou very much
Roul Oldenburger
[I've never seen a version of lex or yacc with file inclusion, but you
can use cpp or m4 as a separate prepass. It's about two lines in your
makefile. -John]

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