[Bug c++/53494] [4.7/4.8 Regression] ICE with invalid initializer list

[daniel.kruegler at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53494

--- Comment #14 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2012-05-29 21:16:57 UTC ---
(In reply to comment #13)
> Am I interpreting correctly that double braces are /required/ for std::array
> init lists but only when the subtype has has a multivariable initializer too?

I must agree that the compiler behaviour does not look correct to me. Initially
I thought that the reason is due to the fact, that brace-elision does not apply
here, but then I noticed that this code does not compile either:

struct pair
{
  pair(const char*, int) { }
};

struct array_p
{
  pair data[1];
};

array_p a  = { { "smile", 1 } };

Here we have definitively brace elision in action, but I get the same error as
from Jonathan's example. My impression is that the compiler incorrectly does
not see the brace-elision case here.

Here is an example that works (with an expected [-Wmissing-braces] warning):

struct string
{
  string(const char*) { }
};

struct array_s
{
  string data[1];
};

array_s b{ "smile" };

From this I see that gcc already implements

http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1270

so I must conclude that the compiler should also accept the original example.