gcc/testsuite/gcc.dg/cpp/cxxcom1.c

   1 /* { dg-do preprocess } */
   2 /* { dg-options "-pedantic -std=gnu89" } */
   3
   4 /* You can't do this in your own code... */
   5 // C++ comment is not in C89  { dg-warning "style comment|reported only once" "good warning" }
   6
   7 /* ...but we don't bitch about it more than once.  */
   8 // C++ comment is not in C89  { dg-bogus "style comment" "bad warning" }
   9
  10 /* { dg-final { scan-file-not cxxcom1.i "is not in C89" } } */
  11