Reentrant Flex and Bison

richard.lanyon@wadham.oxford.ac.uk (Richard Lanyon)
16 Nov 1999 23:53:13 -0500

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From: richard.lanyon@wadham.oxford.ac.uk (Richard Lanyon)
Newsgroups: comp.compilers
Date: 16 Nov 1999 23:53:13 -0500
Organization: Nun
Keywords: lex, yacc, parse, comment

I'm trying to get a lexer + parser combination going using flex and bison.
The problem is that I seem to have to declare yylex (as int yylex()) in
the C declarations section of the bison grammar file.
This wouldn't necessarily be a problem (except that I'm sure I shouldn't
/have/ to) except that if I then want to make a re-entrant (aka "pure")
parser, yylex needs to be declared as
int yylex(YYSTYPE *lvalp)
and YYSTYPE isn't defined in the C declarations section of the Bison
grammar file - it only comes into being in the Bison declaration section.


Any ideas?
--
Richard
[I took a look, didn't see any very satisfactory approaches other than
declaring yylex() without a prototype. -John]

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