bison push parser, and autoconf

[Bob Rossi]

Hi,

I have a small problem. I want to make a release of cgdb soon, and I
realized that I currently build my parser with the push parser
interface. For now, I can disable building the parser, since it isn't
in use yet.

However, in the near future, after the bison release, I might finally
start using this parser. So, I currently use AC_PROG_YACC in my
configure.init. I'm realizing that is not longer good enough.

I need something that will check for bison, and will check for the
version of bison, or for the push parser feature. Does anyone have any
suggestions for me?

I think it would be nice if we made this available to the autoconf
people, because, others are going to need this.

Thanks,
Bob Rossi