[Bug libstdc++/85098] undefined reference to std::regex::extended

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85098

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |link-failure
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-03-28
            Version|unknown                     |7.3.1
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
-std=c++17 only works since GCC 7, pre-GCC 7 it fails the same way.  It also
works when optimization is enabled.