/* physical memory */
typedef struct pmem_struct {
 uint32_t val;
} pmem_s, *pmem_p;

pmem_p pmem_new() {
  pmem_s pmems;
  pmem_p pmem = &pmems;
  pmem->val = 0;
  //printf(stderr, "From Mem: %xn", pmem->val);
  return pmem;
}

#include <stdio.h>

#include "temp.h"
#include "gen.h"

int main() {
    pmem_p pmem = pmem_new(); /* create some physical memory */
    fprintf(stderr, "From Mem: %xn", pmem->val);
......
}

pmem_p pmem_new() {
  pmem_s pmems;
  pmem_p pmem = &pmems;
  pmem->val = 0;
  //printf(stderr, "From Mem: %xn", pmem->val);
  return pmem;
}

pmem_p pmem_new_correct() {
  pmem_p pmem = malloc(sizeof(*pmem));
  pmem->val = 0;
  return pmem;
}

int main() {
  pmem_p pmem = pmem_new();
  fprintf(stderr, "From Mem: %xn", pmem->val);
  ......
  free(pmem);
}