C - redefinition error in Xcode -


my c header file has following error message in xcode

redefinition of 'entry'

but works when compile using gcc in command line. of give explanation of why?

this snapshot.h:

#ifndef snapshot_h #define snapshot_h  #define max_key_length 16 #define max_line_length 1024  typedef struct value value; typedef struct entry entry; typedef struct snapshot snapshot;  struct value {     value* prev;     value* next;     int value; };  // line below redefinition error appears struct entry {     entry* prev;     entry* next;     value* values;     char key[max_key_length]; };  struct snapshot {     snapshot* prev;     snapshot* next;     entry* entries;     int id; };  #endif

this snapshot.c:

#include <stdio.h> #include <stdlib.h> #include <strings.h> #include "snapshot.h"  int main(int argc, char *argv[]){     int x = 7;     printf("x= %d\n" , x);     printf("value = %d\n", 1);     return 0; }

entry reserved keyword , later declared obsolete. older compilers don't allow (see this question). change name of struct , should fine.


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