[llvm-bugs] [Bug 50207] New: call to constexpr variadic class member function is not emitted (and triggers warning)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50207

            Bug ID: 50207
           Summary: call to constexpr variadic class member function is
                    not emitted (and triggers warning)
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ldalessandro 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

In the following example, the call to `foo` is not emitted.

```
struct Foo {
    constexpr static int bar() {
        return foo(42);
    }

    constexpr static int foo(int, auto...) { 
        return 0;
    }
};

// warning: inline function 'Foo::foo<>' is not defined [-Wundefined-inline]
int i = Foo::bar(); 
```

1. If I reorder the definitions of  `bar` and `foo` this works fine.
2. If I add some unused function `car` after the definition of `foo` this works
fine.
3. If foo is not a variadic template it works fine.
3. The `static`ness if the function is irrelevant, just makes the example
smaller.

See a working version at https://godbolt.org/z/dKqze6fKn.

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