gcc/testsuite/g++.dg/lookup/builtin2.C

   1 /* { dg-do compile } */
   2
   3 /* PR c++/21087 */
   4
   5 /* We used to overload the template function with the built-in
   6    declaration, instead of replacing it as we should, and then barf at
   7    the using decl because of a test that none of the overload set
   8    members were anticipated built-ins.  */
   9
  10 extern "C" signed int toupper(signed int __c) throw();
  11 namespace std
  12 {
  13   template< typename a > a toupper(a,int){}
  14   using ::toupper;
  15 }
  16
  17 int f () {
  18   std::toupper((signed int)'a');
  19 }