Best C compiler for Amiga?

[kolla]

The Atari guys have ported GCC 6.2 to 68k.

Just a bunch of hackers

[kolla]

Yes, the new code might be all polished, nicer, easier to maintain, supports C++ in its latest version, and C99 ... but just doesn't work brilliantly on old platforms, sorry.

You have data to back this up? Debian/m68k is using gcc6 and they have built around 10k of packages now, as well as the kernel, glibc etc. using newer gcc (currently gcc-6.2 I think).

[kolla]

I'm surprised it still supports 68k at all.

m68k as embedded platform is still a commercial thing. But most of all this has to do with the ColdFire CPUs, and how gcc etc treats ColdFire and m68k as the same "family" of architectures. Improvements done for CF are most often also done for m68k.