[Bug c++/53498] Compiler crashes during C++11 template magic compilation

[daniel.kruegler at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53498

Daniel Krügler <daniel.kruegler at googlemail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |daniel.kruegler at
                   |                            |googlemail dot com

--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2012-05-27 14:32:40 UTC ---
While the test code is somewhat broken, I found some suspicious compiler
behaviour when rewriting this into the following form, compiled with 
-std=c++11 -Wall using gcc 4.8.0 20120520 (experimental):

//------------
template<typename... Args>
struct A
{
  template<typename U>
  static
  auto a(const U& u, const Args&... args, int) -> decltype(u.print(args...))
  {
    return u.print(args...);
  }
  template<typename U>
  static
  int a(const U& u, const Args&... args, ...)
  {
    return 0;
  }
};

template<typename... Args>
struct B
{
  template<typename U>
  static
  void b(const U& u, const Args&... args, decltype(A<Args...>::a(u, args...,
0)) dummy)
  {
  }
};

int main() {
  A<int>::a(0, 0, 0); // OK
  B<int>::b(0, 0, 0); // ?
}
//------------ 

On my mingw build there is no diagnostics and no binary output produced except
that the compiler does not return successfully due to the last line
instantiating B<int>. In my experience that gives a seg fault on other systems,
so I recommend to run it through another system.