Migrtaion, bison has no option -P like yacc

Hello,
       Appreciate your help for this in advance. Yacc used to have an option called -P to pass custom parser (Allows you to specify the parser of your choice instead of /usr/share/lib/ccs/yaccpar. For example, you can specify). Our code currently using that feature whicn needs to be migrated over to bison which doesn't have this option. Any idea about the approach?
Rgds
Ram
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