[cb321]

I use tcc with Nim all the time and it yields almost interpreted REPL-like code-iteration speed (like 100-500ms per compile-link - almost ENTER-see-results).

As a warning, you need to be sure --lineDir=off in your nim.cfg or config.nims (to side-step the infinite loop mentioned in https://github.com/nim-lang/Nim/pull/23488). You may also need to --tlsEmulation=on if you do threads and you may want to --passL=-lm.

tcc itself is quite fast. Faster for me than a Perl5 interpreter start-up for me (with both on trivial files). E.g., on an i7-1370P:

    tim "tcc -run /t/true.c" "/bin/perl</n"
    58.7 +- 1.3 μs  (AlreadySubtracted)Overhead
    437 +- 14 μs    tcc -run /t/true.c
    589 +- 10 μs    /bin/perl</n

{ EDIT: /n -> /dev/null and true.c is just "int main(int ac,char*av){return 0;}". }

[summarity]

Ah nice, I’ve been meaning to try TCC with Nim.