pass constexpr intializer_list as argument in c++14

Why doesn't this work:

constexpr initializer_list<int> ilist = {1,2,3,4};
constexpr int my_min = min(ilist);

While this does:

constexpr int my_min = min({1,2,3,4});

I'm basing my code on the constexpr std::min() function as shown here and I'm using clang3.5.0 to compiler (g++4.9.1 doesn't seem to be aware of a constexpr std::min()).

I can't make sense of the error I'm getting:

clang35 -stdlib=libc++ -std=c++14 test.cpp  -o test;
test.cpp:158:35: error: constexpr variable 'ilist' must be initialized by a constant expression
  constexpr initializer_list<int> ilist = {1,2,3,4};
                                  ^       ~~~~~~~~~
test.cpp:158:35: note: pointer to subobject of temporary is not a constant expression
test.cpp:158:43: note: temporary created here
  constexpr initializer_list<int> ilist = {1,2,3,4};
                                          ^
test.cpp:159:17: error: constexpr variable 'my_min' must be initialized by a constant expression
  constexpr int my_min = min(ilist);
                ^        ~~~~~~~~~~
test.cpp:159:30: note: initializer of 'ilist' is not a constant expression
  constexpr int my_min = min(ilist);
                             ^
test.cpp:159:30: note: in call to 'initializer_list(ilist)'
test.cpp:158:35: note: declared here
  constexpr initializer_list<int> ilist = {1,2,3,4};