gcc/testsuite/gcc.dg/Wrestrict-20.c

   1 /* PR c/84919 - bogus -Wrestrict on sprintf %p with destination as argument
   2    { dg-do compile }
   3    -O2 isn't strictly necessary but setting also verifies that the sprintf/
   4    strlen pass doesn't warn with non-constant arguments.
   5    { dg-options "-O2 -Wall" } */
   6
   7 extern int sprintf (char* restrict, const char* restrict, ...);
   8 extern int snprintf (char* restrict, __SIZE_TYPE__, const char* restrict, ...);
   9
  10 char a[32];
  11
  12 void test_warn (char *p)
  13 {
  14   a[0] = 0;
  15   sprintf (a, "a=%s", a);     /* { dg-warning "-Wrestrict" } */
  16
  17   p = a;
  18   char *q = p + 3;
  19   sprintf (p, "a=%s", q);     /* { dg-warning "-Wrestrict" } */
  20 }
  21
  22 void test_nowarn_front_end (char *d)
  23 {
  24   sprintf (d, "%p", d);
  25   snprintf (d, 32, "%p", d);
  26
  27   sprintf (a, "p=%p", a);
  28   snprintf (a, sizeof a, "%p", a);
  29 }
  30
  31 void test_nowarn_sprintf_pass (char *d)
  32 {
  33   char *q = d;
  34
  35   sprintf (d, "p=%p", q);
  36   snprintf (d, 32, "p=%p", q);
  37
  38   q = a;
  39   sprintf (a, "a=%p", q);
  40   snprintf (a, sizeof a, "a=%p", q);
  41 }