gcc/testsuite/gcc.dg/compare1.c

   1 /* Test for a bogus warning on comparison between signed and unsigned.
   2    This was inspired by code in gcc. */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-Wsign-compare" } */
   6
   7 int tf = 1;
   8
   9 /* This enumeration has an explicit negative value and is therefore signed.  */
  10 enum mm1
  11 {
  12   VOID, SI, DI, MAX = -1
  13 };
  14
  15 /* This enumeration fits entirely in a signed int, but is unsigned anyway.  */
  16 enum mm2
  17 {
  18   VOID2, SI2, DI2, MAX2
  19 };
  20
  21 int f(enum mm1 x)
  22 {
  23   return x == (tf?DI:SI); /* { dg-bogus "signed and unsigned" "case 1" } */
  24 }
  25
  26 int g(enum mm1 x)
  27 {
  28   return x == (tf?DI:-1); /* { dg-bogus "signed and unsigned" "case 2" } */
  29 }
  30
  31 int h(enum mm2 x)
  32 {
  33   return x == (tf?DI2:SI2); /* { dg-bogus "signed and unsigned" "case 3" } */
  34 }
  35
  36 int i(enum mm2 x)
  37 {
  38   return x == (tf?DI2:-1); /* { dg-warning "signed and unsigned" "case 4" } */
  39 }