gcc/testsuite/gcc.dg/uninit-9.c

   1 /* Spurious uninitialized variable warnings.  Slight variant on the
   2    documented case, inspired by reg-stack.c:record_asm_reg_life.  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-O -Wuninitialized" } */
   6
   7 struct foo
   8 {
   9     int type;
  10     struct foo *car;
  11     struct foo *cdr;
  12     char *data;
  13     int data2;
  14 };
  15
  16 extern void use(struct foo *);
  17
  18 #define CLOBBER 6
  19 #define PARALLEL 3
  20
  21 void
  22 func(struct foo *list, int count)
  23 {
  24     int n_clobbers = 0;
  25     int i;
  26     struct foo **clob_list;   /* { dg-bogus "clob_list" "uninitialized variable warning" } */
  27
  28     if(list[0].type == PARALLEL)
  29     {
  30         clob_list = __builtin_alloca(count * sizeof(struct foo *));
  31
  32         for(i = 1; i < count; i++)
  33         {
  34             if(list[i].type == CLOBBER)
  35                 clob_list[n_clobbers++] = &list[i];
  36         }
  37     }
  38
  39     for(i = 0; i < n_clobbers; i++)
  40         use(clob_list[i]);
  41 }