After talking about FreeBSD's transition to Clang
as the default C/C++ compiler rather than GCC, the move has finally happened where for x86/x86_64 systems the LLVM-based compiler has replaced GCC.
Using Clang for FreeBSD builds the software quicker while using less RAM
while BSD developers also like LLVM/Clang since it's under a BSD-like license rather than the GPLv3 with GCC.
The next FreeBSD release where it will feature LLVM/Clang rather than GCC as the default compiler is with FreeBSD 10
. The final heads up about the compiler change was made on the mailing list