[Bug c++/54483] undefined reference to static constexpr in .so

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54483

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |INVALID

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Mitsuru Kariya from comment #9)
> (In reply to Juisoo from comment #8)
> > However, if I add another data member which is initialized with val by
> > default, I still get the "undefined reference" error, see second attachment.
> 
> The second testcase is reduced like below.
> 
> ============== testcase ==============
> struct A {
>     static constexpr float val = 0.08;
>     A(const float& = val) {}
> };
> 
> int main()
> {
>     A{};
> }
> ============== testcase ==============
> cf. http://melpon.org/wandbox/permlink/ZCbNwLlPQakWjluY

You still need:
constexpr float A::val;