gcc/testsuite/gcc.dg/uninit-6.c

   1 /* Spurious uninitialized variable warnings.
   2    This one inspired by java/class.c:build_utf8_ref.  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-O -Wuninitialized" } */
   6
   7 #include <stddef.h>
   8
   9 struct tree
  10 {
  11     struct tree *car;
  12     struct tree *cdr;
  13     int type, data;
  14 };
  15
  16 extern void *malloc(size_t);
  17
  18 #define INTEGER_T 1
  19 #define PTR_T     2
  20
  21 #define APPEND(TREE, LAST, TYPE, VALUE)                         \
  22 do {                                                            \
  23      struct tree *tmp = malloc (sizeof (struct tree));          \
  24      tmp->car = 0; tmp->cdr = 0; tmp->type = TYPE;              \
  25      tmp->data = VALUE;                                         \
  26      if (TREE->car)                                             \
  27          LAST->cdr = tmp;                                       \
  28      else                                                       \
  29          TREE->car = tmp;                                       \
  30      LAST = tmp;                                                \
  31 } while(0)
  32
  33 struct tree *
  34 make_something(int a, int b, int c)
  35 {
  36     struct tree *rv;
  37     struct tree *field;  /* { dg-bogus "field" "uninitialized variable warning" { xfail *-*-* } } */
  38
  39     rv = malloc (sizeof (struct tree));
  40     rv->car = 0;
  41
  42     APPEND(rv, field, INTEGER_T, a);
  43     APPEND(rv, field, PTR_T, b);
  44     APPEND(rv, field, INTEGER_T, c);
  45
  46     return rv;
  47 }