gcc/testsuite/gcc.dg/c99-const-expr-1.c

   1 /* Test for constraints on constant expressions.  In C90 it is clear that
   2    certain constructs are not permitted in unevaluated parts of an
   3    expression (except in sizeof); in C99 it might fall within implementation
   4    latitude; and if the operands are suitable, diagnostics should not be
   5    issued.
   6 */
   7 /* Origin: Joseph Myers <jsm28@cam.ac.uk>; inspired by
   8    http://deja.com/getdoc.xp?AN=524271595&fmt=text by Peter Seebach.
   9 */
  10 /* { dg-do compile } */
  11 /* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
  12
  13 /* The comma operator is in a subexpression that is not evaluated, so OK
  14    by C99.  In C90 a diagnostic is required since it is not in a sizeof.
  15 */
  16 int i = (1 ? 0 : (2, 3));