[LLVMbugs] [Bug 16618] New: Unnecessary warning about undefined inline for constexpr function template when used in an unevaluated context

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16618

            Bug ID: 16618
           Summary: Unnecessary warning about undefined inline for
                    constexpr function template when used in an
                    unevaluated context
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dblaikie at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

uneval.cpp:2:15: warning: inline function 'func<int>' is not defined
[-Wundefined-inline]
constexpr int func();
              ^
uneval.cpp:5:17: note: used here
  return sizeof(func<int>());
                ^
1 warning generated.
blaikie at blaikie:~/dev/scratch$ cat uneval.cpp
template<typename T>
constexpr int func();

int main() {
  return sizeof(func<int>());
}

I'm not sure if this is really important/valid, but it seemed strange enough to
file.

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