For those using native clang/llvm for mips: I'm able to start with llvm/clang on x86 linux and build a native clang/llvm/mips. Then using this native clang/llvm/mips I can compile and link clang/llvm and the resulting compiler passes make check. I'm doing more testing now with test-suite and other things. No tweaking of scripts is necessary. Just standard configure and make with the proper settings.