[llvm-bugs] [Bug 26869] New: error: declaration of constexpr static data member 'var' requires an initializer

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https://llvm.org/bugs/show_bug.cgi?id=26869

            Bug ID: 26869
           Summary: error: declaration of constexpr static data member
                    'var' requires an initializer
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jtony at ca.ibm.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

clang 3.6/3.8 both fail to compile the following test case while g++ can
compile it successfully.

-bash-4.2$ cat reduce.cpp
enum E1 { e1, e2 = 3, e3 };
template <class C> struct S { static constexpr E1 var = e1; };
template <> constexpr E1 S<int>::var;
-bash-4.2$
-bash-4.2$ clang++ -m64 reduce.cpp  -std=c++11 -c
reduce.cpp:3:34: error: declaration of constexpr static data member 'var'
requires an initializer
template <> constexpr E1 S<int>::var;
                                 ^
1 error generated.
-bash-4.2$
-bash-4.2$ g++ -m64 reduce.cpp  -std=c++11 -c
-bash-4.2$

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