[llvm-bugs] [Bug 24903] New: clang fails to use constexpr variable template as default value of non-type template argument

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24903

            Bug ID: 24903
           Summary: clang fails to use constexpr variable template as
                    default value of non-type template argument
           Product: clang
           Version: 3.7
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++14
          Assignee: unassignedclangbugs at nondot.org
          Reporter: fmatthew5876 at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

template <typename T>
constexpr int A = 1;

template <typename T, int a = A<T>>
  struct B {};

template struct B<int>;

The above code compiles in gcc but fails to compile in clang 3.7 with the
following error:
error : non-type template argument is not a constant expression

Theres also a stack overflow question with this same issue where someone claims
the bug was fixed when in fact it appears that it was not.

http://stackoverflow.com/questions/30260489/is-it-possible-to-use-a-constexpr-template-variable-as-the-default-for-a-forma/32702600#32702600

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