Linked List error [SOLVED]

Question

I have written linked lists many times, but I'm stumped by this error.
header
#include <stdio.h>
typedef struct
char *str;
struct strstack *next;
} strstack;
void connect(struct strstack *a, struct strstack *b);
source
#include <stdio.h>
#include "strstack.h"
void connect(struct strstack *a, struct strstack *b)
a->next = b;
errors
gcc -g -O2 --std=c99 -c strstack.c
strstack.c: In function 'connect':
strstack.c:7: error: dereferencing pointer to incomplete type
make: *** [strstack] Error 1
Does anybody have any idea what causes this?
Last edited by Lexion (2009-09-12 23:48:49)

Answer 1

Yes.
Your typedef is silly.
Replace with
typedef struct stack_s
char *str;
struct stack_s *next;
} stack_t;
or similar.
You have to name the struct, and use the struct name when declaring the next pointer. You can typedef it too, if you want to, but that name can't be used in the struct declaration.