[LLVMbugs] [Bug 17938] New: constexpr variable cannot initialize by nested derived class

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17938

            Bug ID: 17938
           Summary: constexpr variable cannot initialize by nested derived
                    class
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: bolero.murakami at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

a minimal case:
^^^^
template<typename T>
constexpr T const& f(T const& x) { return x; }

struct X {};
struct Y : X {};
struct Z : Y { constexpr Z() {} };　/*user-declared constructor*/

static constexpr auto z = f(Z());
----

compile error:
^^^^
error: constexpr variable 'z' must be initialized by a constant expression
static constexpr auto z = f(Z());
                      ^ ~~~~~~
note: subobject of type 'X' is not initialized 1 error generated.
----
http://melpon.org/wandbox/permlink/b3vxDWZB5GoWaDO5

failed in clang HEAD 3.4 (trunk 194724) -std=c++11/-std=c++1y.

I tested it in clang 3.2,3.3 and GCC 4.7,4.8 are compile succeeded.

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