Nordic characters in c++ variable names?

Is it somehow possible to program in c++ using characters from the nordic alphabet in class- and variable names? (specifically : æ, ø and å).

example:

auto føø = 2;

I am using GCC > 6, which do not seem to support it. Any other compiler supporting these characters?

(FYI: I have duckduckgoed this, but come up empty).