https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92484
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Romain Geissler from comment #0) > Is there any official way to build gcc with another C++ standard by default > ? And is in-tree build of libs like gmp/mpfr/mpc/isl still supported or > officially declared deprecated and shall not be used anymore ? It's supported but the recommendation is to use the versions known to work. If ISL 0.22 doesn't work in-tree, don't use that version in-tree.
