Re: [HACKERS] Re: [PATCHES] Select parser at runtime

[Ian Lance Taylor]

Jan Wieck <[EMAIL PROTECTED]> writes:

>     If we want to have both parsers available at runtime we  need
>     to  replace the YY (case-insensitive) prefix in the generated
>     files per parser and call the right one from tcop.   Now  for
>     some flex/bison combo's at least the prefix switches (to have
>     something different than YY) don't work reliable. There  will
>     be  some  global  YY-objects  left, causing linkage problems.
>     That's why PL/pgSQL's scanner/parser's C-code is run  through
>     sed(1).

This is a solved problem.  gdb, for example, links together four
different Yacc-based parsers, without even using bison's -p option.

Ian

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