parser name defined to default :"parse" warning bison after %start

Question

I have a bison-flex project working on linux ubuntu vmPlayer, and for some reason I have a warning I can't get off.. this is the beginning of my file, and my program (extra.y is bison file) does start with "lines":

%{   
   #include <stdio.h> 
   #include <stdlib.h>  
   #include <string>
   #include <string.h>
#include <iostream>
   #include <map>   
   #include <math.h>
   #include <algorithm>
   int yylex();   
   void yyerror(const char*)       
   char dollarOrWave=' ';
%}

%left OR 
%left AND
%union {
int     int_val;
char*   str_val;
}                         //THIS IS LINE 70 !!

%token<int_val> T_INT              
%token<str_val> STREXP
%type<int_val> expr   
%type<str_val> stringExp
%start lines

%%
lines:            
    line         { }//checkDollars(); }//checkDollars(); }
| lines line     { checkDollars(); numStringVarsFlag=0; }
;

Warning:

extra.y:70 parser name defined to default :"parse"

Searching I've seen that: Bison grammar warnings but it still gives me that warning.. ..HELP??

How do you call bison? What is line 70? Are you getting the same warning with this six-line bison file that you provided? I presume not, as `line` is not defined. Can you provide a MWE? — nickie, Dec 10 '16 at 23:01
aviad@ubuntu:~/Desktop/bison$ rm -f *.h *.c *.o *.exe ; flex extra.lex ; bison -d -v extra.y ---> this is how I call bison and this is where the warning appears.. I edited it , I can't put all my code here, its very long and I don't think its relevant since that warning started when I started the project with fewer code — mooly, Dec 10 '16 at 23:21
I cannot reproduce the warning with your code. Please, provide a MWE. — nickie, Dec 11 '16 at 00:36
An MWE is not just "some more code". It's the least possible amount of code that when you (or anyone else) add to an empty file `extra.y` and then run `bison -d -v extra.y`, you get the warning that you mention. With what you currently have, I can still not reproduce it and therefore I cannot help you. — nickie, Dec 11 '16 at 11:15

score 2 · Answer 1 · answered Feb 09 '17 at 14:42

2

Finally found it.

Add %name parse before %token

Eg:

%name parse
%token NUM

(From: https://bdhacker.wordpress.com/2012/05/05/flex-bison-in-ubuntu/#comment-2669)

answered Feb 09 '17 at 14:42

opticod

795
8
10

score 1 · Answer 2 · answered Dec 12 '16 at 17:09

You are not using bison; you are using bison++. You should make that clear in your question(s) because it does make a difference.

The warning message you receive is normal in bison++; you can avoid it by explicitly declaring a parser class name.

From man bison++ (assuming the documentation is correctly installed):

%name parser_name
Declare the name of this parser. User for C++ class name, and to render many names unique. default is parse. Must be given before %union and %define, or never.

score -1 · Answer 3 · answered Dec 11 '16 at 14:57

-1

You are missing a ';' after the %union {}.

%union {
};

answered Dec 11 '16 at 14:57

hailinzeng

966
9
24

1

No. This is not the problem here (although adding a semicolon does not hurt). Look at the [documentation](https://www.gnu.org/software/bison/manual/html_node/Union-Decl.html), especially the last sentence. – nickie Dec 11 '16 at 15:39

parser name defined to default :"parse" warning bison after %start

3 Answers3