I think clang (https://clang.llvm.org/docs/CrossCompilation.html https://clang.llvm.org/docs/CrossCompilation.html) even makes crosstool largely irrelevant thes

I think clang (https://clang.llvm.org/docs/CrossCompilation.html https://clang.llvm.org/docs/CrossCompilation.html) even makes crosstool largely irrelevant these days. Just specify your desired triplet on the command-line and off you go cross-compiling (mostly) effortlessly without having to build an entirely new toolchain. It can even masquerade as the MSVC compiler if you so desire.