gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-26.c

   1 /* PR middle-end/100307 - spurious -Wplacement-new with negative pointer
   2    offset
   3    { dg-do compile }
   4    { dg-options "-O0 -Wall" } */
   5
   6 extern int sprintf (char*, const char*, ...);
   7
   8 char a[4];
   9
  10 void nowarn_1m1 ()
  11 {
  12   char *p = a + 1;
  13   sprintf (p - 1, "%i", 123);   // { dg-bogus "-Wformat-overflow" }
  14 }
  15
  16 void nowarn_4m3 ()
  17 {
  18   char *p = a + 4;
  19   sprintf (p - 3, "%i", 12);    // { dg-bogus "-Wformat-overflow" }
  20 }
  21
  22 void warn_2m1 ()
  23 {
  24   char *p = a + 2;
  25   sprintf (p - 1, "%i", 123);   // { dg-warning "-Wformat-overflow" "pr100325" }
  26 }
  27
  28 void warn_3m1 ()
  29 {
  30   char *p = a + 3;
  31   sprintf (p - 1, "%i", 12);    // { dg-warning "-Wformat-overflow" "pr100325" }
  32 }
  33
  34 void warn_4m1 ()
  35 {
  36   char *p = a + 4;
  37   sprintf (p - 1, "%i", 1);     // { dg-warning "-Wformat-overflow" "pr100325" }
  38 }