I think a working LLVM 68k port is more exciting
.
Clang would be nice. We have GCC v6 but another modern C++ compiler would be nice.
The author of M680x0-llvm posted in August to the LLVM mailing list about merging changes to the main tree.
It's definitely interesting. Building it now (will take a while...).
LLVM has loads of frontends: ActionScript, Ada, C#, Common Lisp, Crystal, CUDA, D, Delphi, Fortran, Graphical G Programming Language, Halide, Haskell, Java bytecode, Julia, Kotlin, Lua, Objective-C, OpenGL Shading Language, Pony, Python, R, Ruby, Rust, Scala, Swift, and Xojo.