Although Rust compile times are rather bad, IME such astronomical compile times are rather a result of terrible code quality, a lot of code doing essentially nothing, just gluing glue, to the point where it's normal to get a 50-60 frames deep stack trace with most functions being named such that it would suggest that all of them do basically the same. Then you look at their bodies and... yep... doing the same, aka nothing.
With Rust, procedural macros add a lot of overhead when compiling, so I try to avoid them.
At work, we have a C++ project which, without using distributed builds with distributed ccache, running on powerful cloud computers, takes 3h+. Code quality is adequate. Debugging anything is a nightmare in such a codebase.
While I agree that the compile times are bizarre, I don't think we can jump to conclusions such as "such astronomical compile times are rather a result of terrible code quality" without knowing more about what's being compiled and under what conditions it was being compiled!
With Rust, procedural macros add a lot of overhead when compiling, so I try to avoid them.
At work, we have a C++ project which, without using distributed builds with distributed ccache, running on powerful cloud computers, takes 3h+. Code quality is adequate. Debugging anything is a nightmare in such a codebase.