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 /* This test would fail on targets with short enums being default.  See
   7    compare9.c.  */
   8 /* { dg-skip-if "" { arm*-*-eabi* arm*-*-symbianelf* }  { "*" } { "" } } */
   9
  10 int tf = 1;
  11
  12 /* This enumeration has an explicit negative value and is therefore signed.  */
  13 enum mm1
  14 {
  15   VOID, SI, DI, MAX = -1
  16 };
  17
  18 /* This enumeration fits entirely in a signed int, but is unsigned anyway.  */
  19 enum mm2
  20 {
  21   VOID2, SI2, DI2, MAX2
  22 };
  23
  24 int f(enum mm1 x)
  25 {
  26   return x == (tf?DI:SI); /* { dg-bogus "signed and unsigned" "case 1" } */
  27 }
  28
  29 int g(enum mm1 x)
  30 {
  31   return x == (tf?DI:-1); /* { dg-bogus "signed and unsigned" "case 2" } */
  32 }
  33
  34 int h(enum mm2 x)
  35 {
  36   return x == (tf?DI2:SI2); /* { dg-bogus "signed and unsigned" "case 3" } */
  37 }
  38
  39 int i(enum mm2 x)
  40 {
  41   return x == (tf?DI2:-1); /* { dg-warning "signed and unsigned" "case 4" } */
  42 }