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As someone that has worked with both gcc and llvm, One thing about gcc that drives me bat-guano-crazy is that First you check out gcc, try to build it, and find that you also Need mpc, so you check that out and try to build it, and Find out you also need gmp, so you check that out and try To build it, and find out that you also need mpfr, ..... IE I'm in favor of a mono-repository. Also