gcc/testsuite/gcc.dg/compare2.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 void f(int x, unsigned int y)
  10 {
  11   /* ?: branches are constants.  */
  12   x > (tf?64:128); /* { dg-bogus "changes signedness" "case 1" } */
  13   y > (tf?64:128); /* { dg-bogus "changes signedness" "case 2" } */
  14
  15   /* ?: branches are (recursively) constants.  */
  16   x > (tf?64:(tf?128:256)); /* { dg-bogus "changes signedness" "case 3" } */
  17   y > (tf?64:(tf?128:256)); /* { dg-bogus "changes signedness" "case 4" } */
  18
  19   /* ?: branches are signed constants.  */
  20   x > (tf?64:-1); /* { dg-bogus "changes signedness" "case 5" } */
  21   y > (tf?64:-1); /* { dg-warning "different signedness" "case 6" } */
  22
  23   /* ?: branches are (recursively) signed constants.  */
  24   x > (tf?64:(tf?128:-1)); /* { dg-bogus "changes signedness" "case 7" } */
  25   y > (tf?64:(tf?128:-1)); /* { dg-warning "different signedness" "case 8" } */
  26
  27   /* Statement expression.  */
  28   x > ({tf; 64;}); /* { dg-bogus "changes signedness" "case 9" } */
  29   y > ({tf; 64;}); /* { dg-bogus "changes signedness" "case 10" } */
  30
  31   /* Statement expression with recursive ?: .  */
  32   x > ({tf; tf?64:(tf?128:256);}); /* { dg-bogus "changes signedness" "case 11" } */
  33   y > ({tf; tf?64:(tf?128:256);}); /* { dg-bogus "changes signedness" "case 12" } */
  34
  35   /* Statement expression with signed ?:.  */
  36   x > ({tf; tf?64:-1;}); /* { dg-bogus "changes signedness" "case 13" } */
  37   y > ({tf; tf?64:-1;}); /* { dg-warning "different signedness" "case 14" } */
  38
  39   /* Statement expression with recursive signed ?:.  */
  40   x > ({tf; tf?64:(tf?128:-1);}); /* { dg-bogus "changes signedness" "case 15" } */
  41   y > ({tf; tf?64:(tf?128:-1);}); /* { dg-warning "different signedness" "case 16" } */
  42
  43   /* ?: branches are constants.  */
  44   tf ? x : (tf?64:32); /* { dg-bogus "changes signedness" "case 17" } */
  45   tf ? y : (tf?64:32); /* { dg-bogus "changes signedness" "case 18" } */
  46
  47   /* ?: branches are signed constants.  */
  48   tf ? x : (tf?64:-1); /* { dg-bogus "changes signedness" "case 19" } */
  49   tf ? y : (tf?64:-1); /* { dg-warning "changes signedness" "case 20" } */
  50
  51   /* ?: branches are (recursively) constants.  */
  52   tf ? x : (tf?64:(tf?128:256)); /* { dg-bogus "changes signedness" "case 21" } */
  53   tf ? y : (tf?64:(tf?128:256)); /* { dg-bogus "changes signedness" "case 22" } */
  54
  55   /* ?: branches are (recursively) signed constants.  */
  56   tf ? x : (tf?64:(tf?128:-1)); /* { dg-bogus "changes signedness" "case 23" } */
  57   tf ? y : (tf?64:(tf?128:-1)); /* { dg-warning "changes signedness" "case 24" } */
  58 }