gcc/testsuite/gcc.dg/uninit-9-O0.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 "-Wuninitialized" } */
   6 /* { dg-require-effective-target alloca } */
   7
   8 struct foo
   9 {
  10     int type;
  11     struct foo *car;
  12     struct foo *cdr;
  13     char *data;
  14     int data2;
  15 };
  16
  17 extern void use(struct foo *);
  18
  19 #define CLOBBER 6
  20 #define PARALLEL 3
  21
  22 void
  23 func(struct foo *list, int count)
  24 {
  25     int n_clobbers = 0;
  26     int i;
  27     struct foo **clob_list;   /* { dg-bogus "clob_list" "uninitialized variable warning" } */
  28
  29     if(list[0].type == PARALLEL)
  30     {
  31         clob_list = __builtin_alloca(count * sizeof(struct foo *));
  32
  33         for(i = 1; i < count; i++)
  34         {
  35             if(list[i].type == CLOBBER)
  36                 clob_list[n_clobbers++] = &list[i];
  37         }
  38     }
  39
  40     for(i = 0; i < n_clobbers; i++)
  41         use(clob_list[i]);
  42 }