Not everyone compiles C++ the same way. I prefer header-only libraries and a single compilation unit. Counting lines of code with "gcc -E" to get the headers, I just compiled 20,000 lines of C++ from scratch in .6 seconds with gcc and .4 seconds with clang. I don't have a comparable project in Rust.
(And in the case of uninstantiated templates, a C++ compiler doesn't even need to type check them…)
- Did you have optimizations enabled?
Not many. How many lines would a comparable Rust program have to instantiate? (should be the same)
All I was trying to do was make an apples to apples comparison by discrediting the implication that the clang++ and g++ compilers are only faster because people use separate compilation units.
I think it's fair to compare Rust and C++ this way, and if Rust is slower to compile, then it's fair to ask why.
> Did you have optimizations enabled?
Yes, -O3. Also -Wall -Wextra and -fwrapv if you're interested.