gcc/testsuite/gcc.dg/Wstringop-overflow-32.c

   1 /* PR middle-end/93829 - bogus -Wstringop-overflow on memcpy of a struct
   2    with a pointer member from another with a long string
   3    { dg-do compile }
   4    { dg-options "-O2 -Wall" } */
   5
   6 extern void* memcpy (void*, const void*, __SIZE_TYPE__);
   7
   8 #define S40 "0123456789012345678901234567890123456789"
   9
  10 const char s40[] = S40;
  11
  12 struct S
  13 {
  14   const void *p, *q, *r;
  15 } s, sa[2];
  16
  17
  18 void test_lit_decl (void)
  19 {
  20   struct S t = { 0, S40, 0 };
  21
  22   memcpy (&s, &t, sizeof t);    // { dg-bogus "-Wstringop-overflow" }
  23 }
  24
  25 void test_str_decl (void)
  26 {
  27   struct S t = { 0, s40, 0 };
  28
  29   memcpy (&s, &t, sizeof t);    // { dg-bogus "-Wstringop-overflow" }
  30 }
  31
  32
  33 void test_lit_ssa (int i)
  34 {
  35   if (i < 1)
  36     i = 1;
  37   struct S *p = &sa[i];
  38   struct S t = { 0, S40, 0 };
  39
  40   memcpy (p, &t, sizeof t);    // { dg-bogus "-Wstringop-overflow" }
  41 }
  42
  43 void test_str_ssa (int i)
  44 {
  45   if (i < 1)
  46     i = 1;
  47   struct S *p = &sa[i];
  48   struct S t = { 0, s40, 0 };
  49
  50   memcpy (p, &t, sizeof t);    // { dg-bogus "-Wstringop-overflow" }
  51 }