@Kerp, I occasionally use vcc and mingw64 simultaneously. I don't think there's big different between two.
The different I can say is, when I played around about concurrency in Nim, `threadpool` module still has implicit bug that it can't run the second spawn when I tried it. Also, addition to what @jlp765 mentioned, you can supply your additional `nim.cfg` in your project directory so any additional setting will overwrite default `nim.cfg`. If you want specific Nim file that use specific setting, you can use `yourfile.nim.cfg` so the config only apply to your specific file.
