[llvm-bugs] [Bug 38174] New: warning: inline function '(...)' is not defined (even though it is)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38174

            Bug ID: 38174
           Summary: warning: inline function '(...)' is not defined (even
                    though it is)
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: andrzej.warzynski at spire.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Hello,

$cat baz.cpp:
class A {
  template <char N>
  struct Foo {
    static constexpr char Bar() { return 0; }
  };

  using Constants = Foo<1>;

  char var = Constants::Bar();
};

$ clang++ -std=c++17 -c bug.cpp 
bug.cpp:4:27: warning: inline function 'A::Foo<'\x01'>::Bar' is not defined
[-Wundefined-inline]
    static constexpr char Bar() { return 0; }
                          ^
bug.cpp:9:25: note: used here
  char var = Constants::Bar();
                        ^
1 warning generated.

This warning shouldn't be here, should it? Originally discovered with clang-6,
but I've also checked ToT and that also issues a warning. Could be somewhat
related to 18781, but that particular problem seems to be fixed.

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