Conditional generation of Grammar rules

Why don't you just rewrite the same this way ... it seems
much simpler to
me.

nonterminal X:
{
#ifdef FEATURE
  rule1;
#else
  rule1; rule2;
#endif
}

would it be a problem for you to write it this way?? Or is
your problem much
bigger than what I just addressed.

Regards
Ramaswamy

-----Original Message-----
From: help-bison-bounces+ramaswamyr=ctd.hcltech.comgnu.org
[mailto:help-bison-bounces+ramaswamyr=ctd.hcltech.comgnu.org]
On Behalf Of
Jeganatan, Srividhya
Sent: Tuesday, May 02, 2006 10:08 PM
To: 'help-bisongnu.org'
Subject: Conditional generation of Grammar rules

All,
Is there a way to conditionally generate grammar rules? 
For example, I need to do something like

nonterminal X:
#ifdef FEATURE
 { rule 1 }
#else
 { rule 1; rule 2 }
#endif

I know that ifdefs dont work with the grammar but is there
anything else
that can be done?
Or is it possible to make bison to read define variables
from a make file?

I want to avoid writing different parsers / recursive
parsers to do this.

Thanks for your help.

Srividhya.




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