GCC 9 was released earlier this year, it is now available in Debian testing/unstable. I am planning to do the defaults change in mid August, around the time of the expected first GCC 9 point release (9.2.0).
There are only soname changes for rather unused shared libraries (libgo) involved, and the gnat defaults change will be handled separately by the Debian Ada maintainers. The fortran module changes look ok according to Alastair McKinstry. The gcc-9 package still ftbfs on kfreebsd-*. We still have local patches for at least the various mips, kfreebsd and hurd targets. Please forward these upstream and make sure that these are applied upstream. powerpcspe support is removed upstream. I will keep pointing the default to GCC 8 for this target. Matthias
