gcc/testsuite/gcc.dg/gnu89-const-expr-1.c

   1 /* Test for constant expressions: GNU extensions.  */
   2 /* Origin: Joseph Myers <joseph@codesourcery.com> */
   3 /* { dg-do compile } */
   4 /* { dg-options "-std=gnu89 -pedantic-errors" } */
   5
   6 int n;
   7
   8 void
   9 f (void)
  10 {
  11   int i = 0;
  12   int a[n]; /* { dg-error "ISO C90 forbids variable length array" } */
  13   enum e1 {
  14     /* Integer constant expressions may not contain statement
  15        expressions (not a permitted operand).  */
  16     E1 = (1 ? 0 : ({ 0; })), /* { dg-error "constant expression" } */
  17     /* { dg-error "ISO C forbids braced-groups" "ISO" { target *-*-* } .-1 } */
  18     /* Real and imaginary parts act like other arithmetic
  19        operators.  */
  20     E2 = __real__ (1 ? 0 : i++), /* { dg-error "constant expression" } */
  21     E3 = __real__ 0,
  22     E4 = __imag__ (1 ? 0 : i++), /* { dg-error "constant" } */
  23     E5 = __imag__ 0,
  24     /* __alignof__ always constant.  */
  25     E6 = __alignof__ (int[n]), /* { dg-error "ISO C90 forbids variable length array" } */
  26     E7 = __alignof__ (a),
  27     /* __extension__ ignored for constant expression purposes.  */
  28     E8 = __extension__ (1 ? 0 : i++), /* { dg-error "constant expression" } */
  29     E9 = __extension__ 0,
  30     /* Conditional expressions with omitted arguments act like the
  31        standard type.  */
  32     E10 = (1 ? : i++), /* { dg-error "constant expression" } */
  33     /* { dg-error "ISO C forbids omitting" "ISO" { target *-*-* } .-1 } */
  34     E11 = (1 ? : 0) /* { dg-error "ISO C forbids omitting" } */
  35   };
  36   enum e2 {
  37     /* Complex integer constants may be cast directly to integer
  38        types, but not after further arithmetic on them.  */
  39     F1 = (int) (_Complex int) 2i, /* { dg-error "constant expression" } */
  40     /* { dg-error "complex" "complex" { target *-*-* } .-1 } */
  41     /* { dg-error "imaginary" "imaginary" { target *-*-* } .-2 } */
  42     F2 = (int) +2i, /* { dg-error "constant expression" } */
  43     /* { dg-error "imaginary" "ISO" { target *-*-* } .-1 } */
  44     F3 = (int) (1 + 2i), /* { dg-error "constant expression" } */
  45     /* { dg-error "imaginary" "ISO" { target *-*-* } .-1 } */
  46     F4 = (int) 2i /* { dg-error "imaginary" } */
  47   };
  48   static double dr = __real__ (1.0 + 2.0i);
  49   /* { dg-error "imaginary" "ISO" { target *-*-* } .-1 } */
  50   static double di = __imag__ (1.0 + 2.0i);
  51   /* { dg-error "imaginary" "ISO" { target *-*-* } .-1 } */
  52   /* Statement expressions allowed in unevaluated subexpressions in
  53      initializers in gnu99 but not gnu89.  */
  54   static int j = (1 ? 0 : ({ 0; })); /* { dg-error "constant expression" } */
  55   /* { dg-error "braced" "ISO" { target *-*-* } .-1 } */
  56 }