[llvm-bugs] [Bug 47046] New: Template member variable is considered not a constexpr

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47046

            Bug ID: 47046
           Summary: Template member variable is considered not a constexpr
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: lev.rumyantsev at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

This code snippets fails to compile with clang (as indicated below) but
successfully compiles with gcc.

https://godbolt.org/z/n8nGM3

=============

template <auto T>
class Object {
  template <auto U>
  static constexpr bool kTrue = true;

 public:
  static int Method() {
      // error: constexpr if condition is not a constant expression
      if constexpr (kTrue<0>) return 0;
      return 0;
  }
};

int Foo() {
    return Object<0>::Method();
}

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