Fully operational. On arm/linux it is trivially easy to use, tends to just work out of the box (ldc offers packaged downloads on their website, gdc is in the Ra

Fully operational. On arm/linux it is trivially easy to use, tends to just work out of the box (ldc offers packaged downloads on their website, gdc is in the Raspbian repository, etc). If you are doing bare metal and/or strictly limited hardware resources it is a little more work to be productive with minimal runtime but still not hard if you're familiar with how to do it.