1  /* Test for constant expressions: GNU extensions.  */
       2  /* Origin: Joseph Myers <joseph@codesourcery.com> */
       3  /* { dg-do compile } */
       4  /* { dg-options "-std=gnu90 -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  }