The tool chains are coming along nicely. Not sure they are ready for primetime. But likely are. The biggest issue is the lack of hardware. I do know some distros have been heading in that direction. Don't know if anything is actually rolled out. The instruction sets are broken down into extensions. So compilers will simply be told for which extensions to include support. The esp uC guys appear to be heading to the risk v direction. Iirc, that's the instruction set for their low power processor. And iirc, the newer C line of uCs. They did this because the instruction set appears ahead of expressive's own efforts. Take comment with grain of salt as I'm parroting.