GCC 7.3.0 for the FreeMiNT target has been just released: https://github.com/freemint/m68k-atari- ... 7_3_0-mint
The main difference against GGN's GCC (currently in version 8.2) is that this toolchain provides the more traditional patchset, i.e. producing a.out binaries compatible with TOS executables, doesn't require any special flags or pre-/post-processing. And hey, works natively on the FireBee!
On the other hand it is, well, an a.out target so it doesn't produce so finely tuned link time optimisations.