extern declaration, T* v/s T[]

Question

I saw following piece of code in a legacy project.

/* token.c */
struct token id_tokens[MAX_TOKENS];

/* analyse.c (v1) */
extern struct token *id_tokens; /*         


        

Answer 1

The first version is wrong. Arrays are NOT pointers, the declaration extern struct token *id_tokens; doesn't match the definition type struct token id_tokens[MAX_TOKENS];.

Reference: C FAQ: I had the definition char a[6] in one source file, and in another I declared extern char *a. Why didn't it work?. Also, see this.