RE: YYSTYPE doesnt work

[Vidhya]

Hi
I have redefined YYSTYPE to char* in my code and is working for me . Can you
paste the y file and the generated code.


-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of maaltan
Sent: Tuesday, September 19, 2006 10:34 AM
To: address@hidden
Subject: YYSTYPE doesnt work


I am trying to learn Bison and flex.

I am trying to build a simple command line calculator simular to the TI
series of calculators.

When i put #define YYSTYPE double in the c declarations section of my exp.y
file it appears to be ignored.

here is a block of the relevent c code it generates

#define YYSTYPE double
#include <stdlib.h>
...
#if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED)
typedef int YYSTYPE;
# define yystype YYSTYPE /* obsolescent; will be withdrawn */
# define YYSTYPE_IS_DECLARED 1
# define YYSTYPE_IS_TRIVIAL 1
#endif

I am generating a header for the lex.yy.c file.  It is NOT including the
#define but does have the "int" block above.  If I try to manually put the
#define in the .h file then the compiler warns (and it still being defined
as an int).

The only way i can make it work is to remove the #define and change the
typedef to double.  a hack which is a PITA.  I tried to compile the example
reverse polish notation calculator with the same results.  Everything is
getting cast into integers.

I am using version 1.875d of Bison , flex 2.5.31 and gcc (GCC) 3.3.5 (Debian
1:3.3.5-13)

everything is as up to date as I can get from the stable repositories.

here is snippets of the files where the problem might be.

exp.y:

%{
#define YYSTYPE double
#include <stdlib.h>
%}

scan.lex:

%option noyywrap
%{
#include "exp.tab.h"
%}
%%
[0123456789]+|([0-9]+[.][0-9]+)         { yylval = atof(yytext);
printf("%d,",yylval); printf("%f\n", yylval); return(NUMBER); }


hmm .. think i fixed it.  I saw it when i pasted the scanner.  Ahh well i
finish the post for others reference.

I need to put the #define YYSTYPE double at the top of scan.lex file also
BEFORE the include so it looks like the following:

%option noyywrap
%{
#define YYSTYPE double
#include "exp.tab.h"
%}
%%
[0123456789]+|([0-9]+[.][0-9]+)         { yylval = atof(yytext);
printf("%d,",yylval); printf("%f\n", yylval); return(NUMBER); }


PS (please ignore all debugging statement and regex inefficencies.  i fix
those later :)
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