gcc/testsuite/gcc.dg/tree-ssa/pr79352.c

   1 /* PR tree-optimization/79352 - -fprintf-return-value doesn't handle
   2    flexible-like array members properly
   3    { dg-do compile }
   4    { dg-options "-O2 -fdump-tree-optimized" } */
   5
   6 struct A { int i; char a1[1]; };
   7 struct B { int i; char a3[3]; };
   8 struct C { int i; char ax[]; };
   9
  10 int test_array_1 (int i, struct A *a)
  11 {
  12   return __builtin_snprintf (0, 0, "%-s", a->a1);
  13 }
  14
  15 int test_array_3 (int i, struct B *b)
  16 {
  17   return __builtin_snprintf (0, 0, "%-s", b->a3);
  18 }
  19
  20 int test_array_1_3 (int i, struct A *a, struct B *b)
  21 {
  22   return __builtin_snprintf (0, 0, "%-s", i ? a->a1 : b->a3);
  23 }
  24
  25 int test_string_and_array_3 (int i, struct B *b)
  26 {
  27   return __builtin_snprintf (0, 0, "%-s", i ? "123" : b->a3);
  28 }
  29
  30 int test_flexarray (struct C *c)
  31 {
  32   return __builtin_snprintf (0, 0, "%-s", c->ax);
  33 }
  34
  35 int test_array_and_flexarray (int i, struct B *b, struct C *c)
  36 {
  37   return __builtin_snprintf (0, 0, "%-s", i ? b->a3 : c->ax);
  38 }
  39
  40 int test_string_and_flexarray (int i, struct C *c)
  41 {
  42   return __builtin_snprintf (0, 0, "%-s", i ? "123" : c->ax);
  43 }
  44
  45 /* { dg-final { scan-tree-dump-times "snprintf" 7 "optimized"} } */