c - Preventing local pointers -

maybe it's newbie question, there method in c/c++ prevent function accepting pointer local variable?

consider code:

int* fun(void) {  int a;  return &a; } 

the compiler generate warning pointer can not returned. consider this:

int* g;  void save(int* a) {  g = a; }  void bad(void) {  int a;  save(&a); } 

this pass through compiler without warning, bad. there attribute or prevent happening? i.e. like:

void save(int __this_pointer_must_not_be_local__ * a) {  g = a; } 

thanks in advance if knows answer.

no, there no reliable , portable way tell pointer local pointer heap object. there no way declaratively prevent this, either.

there hacks dependent on memory layout of particular system work @ runtime invoking unspecified behavior (see this answer example), on own if decide give them try.