#include <stdlib.h>
#include <string.h>
#include <stdio.h>

/* header */
typedef struct {
  char b1[4];
  char b2[24];
} foo_t;
extern foo_t *init(void);

#if ONE  /* first source file */

  extern char a1[4];
  extern char a2[24];

  foo_t *init(void) {
    foo_t *foo = malloc(sizeof(foo_t));
    memcpy(&(foo->b1), &a1, sizeof(a1));
    memcpy(&(foo->b2), &a2, sizeof(a2));
    return foo;
  }

#else /* second source file */

  #if STRICT
    char a1[4] = {};
    char a2[24] = {};
  #else
    int a1 = 0;
    struct {
      char x1[20];
      int x2;
    } a2 = { };
  #endif

  int main() {
    foo_t * f = init();
    if (f) printf("ok\n%s",f->b2);
    return 0;
  }
#endif