For hobbyist compiler implementations, right? Compilers for the most popular languages are either written in C/C++, or self-hosted.
You can write compilers in almost any language. I fail to see how C, C++, or even Java or Python aren’t the right tool for the job here. I like pattern matching too, but given that hundreds of successful production compilers have been written without pattern matching, it’s surely just a personal preference.
I’ve worked on multiple compilers in industry that are written in Ocaml. A number of industrial static analyzers are written in Ocaml too (eg, Infer from Facebook/Meta). Yes, LLVM and GCC are the big ones written in the C/C++ family but they don’t represent everything.
I mean, we _are_ talking about a book which invites you to build your own toy C compiler ^^
Nevertheless, OCaml is very strong in compiler design. For example Rust and Hack were written in OCaml initially.
Nevertheless you are not wrong that compilers needing the very last bit of performance like the JVM and LLVM tend to be written in C++
But the barrier is quite a lot more tending to high performance/very high performance and not toy/production
Java and Python are suitable for implementing a toy Compiler and the auther invites you to use any language you like. Just the reference implementation is using OCaml
I would however argue that using C++ is quite advanced since it does not have pattern matching and using C is just masochm. You will be fighting against the language to do even trivial things instead of fighting the actual problem at hand
You can write compilers in almost any language. I fail to see how C, C++, or even Java or Python aren’t the right tool for the job here. I like pattern matching too, but given that hundreds of successful production compilers have been written without pattern matching, it’s surely just a personal preference.