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Building gcc as a cross-compiler is tedious, painful and confusing. It's so much that it drives many away from OS development, as it did for me- I said "fuck that" and tried to do stuff in assembly, then dropped that too.
However I haven't fully tried it yet, a llvm, clang and compiler-rt toolchain looks easier to build. Here is a script from MettaOS that (hopefully) automates that. I am pretty sure if we can tweak it to our needs, it will greatly lower the barrier of entry.