gcc/testsuite/gcc.dg/uninit-pr65182.c

   1 /* PR middle-end/65182 - -Wuninitialized fails when pointer to variable
   2    later passed to function
   3    { dg-do compile }
   4    { dg-options "-O0 -Wall" } */
   5
   6 void bar (int *a);
   7
   8 int baz (void);
   9
  10 __attribute__ ((noipa)) void foo_O0 (int *b)
  11 {
  12   int a;
  13
  14   if (a)            // { dg-warning "\\\[-Wuninitialized" }
  15     {
  16       *b = 0;
  17       return;
  18     }
  19
  20   bar (&a);
  21
  22   a = baz ();
  23
  24   *b = a + 2;
  25 }
  26
  27 #pragma GCC optimize ("2")
  28
  29 __attribute__ ((noipa)) void foo_O2 (int *b)
  30 {
  31   int a;
  32
  33   if (a)            // { dg-warning "\\\[-Wuninitialized" }
  34     {
  35       *b = 0;
  36       return;
  37     }
  38
  39   bar (&a);
  40
  41   a = baz ();
  42
  43   *b = a + 3;
  44 }