There was a Stack Exchange question answering exactly this question: http://unix.stackexchange.com/questions/49906/why-is-freebsd-deprecating-gcc-in-favor-of-c

There was a Stack Exchange question answering exactly this question: http://unix.stackexchange.com/questions/49906/why-is-freebsd-deprecating-gcc-in-favor-of-clang-llvm/49970#49970 http://unix.stackexchange.com/questions/49906/why-is-freebsd... Another contributing factor may be momentum. Clang is easier to work with than GCC, and doesn't have the baggage of GCC, so more and more people and companies are starting to use it, fund it, and commit code to it. It's been improving in leaps and bounds, and still rapidly improving. It's only a matter of time before it's all around better than GCC.