declaring global variables in yacc

Question

Hello, I have a few source code files, such hashtable.c and such. The main issue is that when I write my main.c as such:

#include "tokens.h"
#include <stdio.h>
void yyerror(char *errorMsg)
{
fprintf(stderr, "%s\n", errorMsg);
}


main() 
{
  yyparse();
  hsh = createHashtable();

}

And at the top of my yacc file (parser.y), I want to declear a hash table as such:

%{
#include <stdio.h>
#include "tokens.h"
#include "ast.c"


struct hashtable *hsh;
.............................
..............................

However I am getting this error.

main.c: In function ‘main’:
main.c:24: error: ‘hsh’ undeclared (first use in this function)
main.c:24: error: (Each undeclared identifier is reported only once
main.c:24: error: for each function it appears in.)
make: *** [main.o] Error 1

I am rather naive while it comes to C programming, any assistance will be greatful

Answer 1

You need an extern struct hashtable* hsh; in your main.c