Problem building a reentrant parser

[ooklac]

Greetings,

I'm having a problem building a reentrant parser. Here's the simple
test I'm doing, as suggested by the flex documentation.  This is using
flex 2.5.31 and bison 2.1 on x86_64 using g++ 4.0.2 on Fedora Core. 
Please send any suggestions or help.

+++ begin file slex.l +++
/* Scanner for "C" assignment statements... sort of. */
%{
#include "sparse.tab.h" /* Generated by bison. */
%}
%option bison-bridge bison-locations

%%

[[:digit:]]+ { yylval->num = atoi(yytext); return NUMBER;}
[[:alnum:]]+ { yylval->str = strdup(yytext); return STRING;}
"="|";" { return yytext[0];}
.  {}

%%

+++ end of slex.l, begin sparse.y +++
/* Parser to convert "C" assignments to lisp. */
%{
/* Pass the argument to yyparse through to yylex. */
#define YYPARSE_PARAM scanner
#define YYLEX_PARAM scanner
#include <stdio.h>
%}
%locations
%pure_parser
%union {
int num;
char* str;
}
%token <str> STRING
%token <num> NUMBER
%%
assignment:
STRING '=' NUMBER ';' {
printf( "(setf %s %d)", $1, $3 );
}
;

%%

+++ end of sparse.y So here's how I'm trying to build, complete with error +++
bison -d sparse.y
flex -f slex.l
g++ lex.yy.c sparse.tab.c sparse.tab.h
sparse.tab.c: In function 'int yyparse(void*)':
sparse.tab.c:1036: error: 'yylex' was not declared in this scope
sparse.tab.c:1267: error: 'yyerror' was not declared in this scope
sparse.tab.c:1382: error: 'yyerror' was not declared in this scope
++++ ok, so if we define the yylex function as follows +++
/* Parser to convert "C" assignments to lisp. */
%{
/* Pass the argument to yyparse through to yylex. */
#define YYPARSE_PARAM scanner
#define YYLEX_PARAM scanner
#include <stdio.h>
int yylex(YYSTYPE * lvalp);
%}
%locations
%pure_parser
%union {
int num;
char* str;
}
%token <str> STRING
%token <num> NUMBER
%%
assignment:
STRING '=' NUMBER ';' {
printf( "(setf %s %d)", $1, $3 );
}
;

%%

+++ produces the following error
sparse.y:7: error: 'YYSTYPE' was not declared in this scope
sparse.y:7: error: 'lvalp' was not declared in this scope
sparse.tab.c: In function 'int yyparse(void*)':
sparse.tab.c:1037: error: 'yylex' cannot be used as a function
sparse.tab.c:1268: error: 'yyerror' was not declared in this scope
sparse.tab.c:1383: error: 'yyerror' was not declared in this scope
+++ examining the tab.c file, it places the declaration of yylex before the
+++ declaration of YYSTYPE
+++ fyi, if you make the declaration extern, you get the following error
sparse.y:7: warning: 'yylex' initialized and declared 'extern'
sparse.y:7: error: 'YYSTYPE' was not declared in this scope
sparse.y:7: error: 'lvalp' was not declared in this scope
sparse.tab.c: In function 'int yyparse(void*)':
sparse.tab.c:1037: error: 'yylex' cannot be used as a function
sparse.tab.c:1268: error: 'yyerror' was not declared in this scope
sparse.tab.c:1383: error: 'yyerror' was not declared in this scope