qjmcc: the Portable C Compiler on RISC-V 64

For a few months there has been a compiler in my tree that I have said nothing about, and it has now done the one thing that made me want to write about it at last: it compiles the whole of QSOE/N — the Skimmer microkernel, taskman, the C library, the dynamic loader, the shell, and every driver and userspace program — and the operating system it produces boots on real hardware and logs in as root,…