[Bug c++/113920] New: Make -std=gnu++20 default for GCC 15

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113920

            Bug ID: 113920
           Summary: Make -std=gnu++20 default for GCC 15
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

Once C++20 support in libstdc++ has been declared stable, we should probably
switch the default from gnu++17 to gnu++20 in GCC 15.  C++ modules will still
be experimental though.