#pragma GCC system_header #define NULL (void *) 0 #define ONEP (void *) 1 #define RETURN return NULL extern void sysbar (unsigned char *); unsigned char * sysfn1 (void *p) { unsigned char *uc = ONEP; uc = ONEP; sysbar (ONEP); return ONEP; } extern void sysbar2 (int); int sysfn2 (void) { int a = NULL; a = NULL; sysbar2 (NULL); return NULL; } int sysfn3 (void) { RETURN; }