[Bug c++/57820] Can't initialize a constexpr object with inline initialization

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57820

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-07-04
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think it's invalid unless you provide an initializer or the class has a
default constructor e.g.

constexpr C d = {};

G++ still rejects that though, with a very unhelpful diagnostic:

t.cc:8:18: error: ‘constexpr C::C()’ called in a constant expression
 constexpr C d = {}; //error
                  ^
t.cc:1:8: note: ‘constexpr C::C()’ is not usable as a constexpr function
because:
 struct C
        ^