Sure! Just compile with nim c --lineDir=on or drop `lineDir=on` in your $HOME/.config/nim/nim.cfg (or per project NimScript .nims or per file foo.nim.cfg or ...) and source-level debugging with gdb on Linux works..

mostly at the level of Nim source, although various things are likely to "leak through" like mangled names (though in fairness, lower-level assembly notions leak through in "C source level" debugging...).

Beware, though, that since around Spring 2024 this can make the tinycc/tcc backend infinite loop (but otherwise tcc can be a nice way to get fast development iteration).

Also recently Nim’s generated C code started using Itanium name mangling, which oddly has become the defacto name mangling method for C++ on Linux and other platforms.

Meaning you get pretty function names with generic types and all included with debuggers that support it. Works better with ldb as gdb seems to refuse to recognize it.