I've been trying to enable tcc in parallel when I noticed [#7750](https://github.com/nim-lang/Nim/issues/7750) and this thread. I have made some minor changes and most of the Nim test cases pass on Windows. There are 22 failing tests (results [here](https://www.dropbox.com/s/lz89i2us5gowyzd/testresults.html), download locally and load to use the filters) and surely one issue with threading.
[This](https://github.com/nim-lang/Nim/blob/devel/tests/parallel/tblocking_channel.nim) test case hangs forever. So does my console text editor [snip](https://github.com/genotrance/snip) once you run it so I think there's still some issues to work out. No doubt tcc only supports Nim's C backend but is super small, fast and might be worth consideration as the starter compiler to try Nim out.
