[llvm-bugs] [Bug 46663] New: undefined symbol when a static constexpr field is defined in the class body

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46663

            Bug ID: 46663
           Summary: undefined symbol when a static constexpr field is
                    defined in the class body
           Product: clang
           Version: trunk
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: yuri at tsoft.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Created attachment 23711
  --> https://bugs.llvm.org/attachment.cgi?id=23711&action=edit
bug.cpp

Compiling the attached code fails:

> $ c++ -o bug bug.cpp
> ld: error: undefined symbol: C::c
> >>> referenced by bug.cpp
> >>>               /tmp/bug-9480f8.o:(C::s())
> c++: error: linker command failed with exit code 1 (use -v to see invocation)

The field "static constexpr float c = 1;" should always lead to symbol "c"
being defined.

Replacing the return type with "float" and returning just "c" makes the problem
go away.

Observed for clang-9.0.1 and clang-11.0.d20200519

OS: FreeBSD 12.1

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