gcc/testsuite/c-c++-common/addrtmp.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2" } */
   3
   4 typedef struct A { int a,b; } A;
   5 int*g(int*x){return x;}
   6 int*f1(){
   7   A x[2]={{1,2},{3,4}};
   8   return g(&x[1].a); // { dg-warning "returns address of local variable" }
   9 }
  10 int*f2(int n){
  11   A x[2]={{1,2},{3,4}};
  12   return n?0:g(&x[1].a); // { dg-warning "may return address of local variable" }
  13 }
  14 A y[2]={{1,2},{3,4}};
  15 int*h(){
  16   return g(&y[1].a);
  17 }
  18 int*j(int n){
  19   A x[2]={{1,2},{3,4}};
  20   int*p=g(&y[1].a);
  21   if(n==1)p=g(&x[1].a);
  22   if(n==2)p=g(&x[0].b);
  23   return p; // { dg-warning "may return address of local variable" }
  24 }
  25 int*s()
  26 {
  27   static int i;
  28   return &i;
  29 }