in case of non-static data member initializers. such as

struct MyConfig_Foo {
  const int i=3;
  const float f=4.14f;
};

one gets

c++ -O2 -std=gnu++11 Config11.cpp  -Wall
Config11.cpp:21:15: warning: non-static const member ‘const int MyConfig_Foo::i’ in class without a constructor [-Wuninitialized]
   const int i=3;
               ^
Config11.cpp:22:17: warning: non-static const member ‘const float MyConfig_Foo::f’ in class without a constructor [-Wuninitialized]
   const float f=4.14f;
                 ^

which I find incorrect.