https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99920
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- GCC 10 doesn't require C++11 and so in theory everything from GCC 4.1 till GCC 11 should be supported as system compiler, perhaps we need some workaround for some known bugs somewhere (we have a couple of them already).
