[Bug libstdc++/81353] New: Please provide a libstdc++ version macro

[coypu at sdf dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81353

            Bug ID: 81353
           Summary: Please provide a libstdc++ version macro
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: coypu at sdf dot org
  Target Milestone: ---

occasionally workarounds are needed for old libstdc++ versions, it would be
easier to do so with the help of a macro.
if the compiler used is not GCC, we can't check for GCC's version.