LLVM Clang vs. GCC Compiler Benchmarks On FreeBSD 11.0 Written by Michael Larabel in Software on 27 August 2016 at 11:30 AM EDT. Page 1 of 4. 16 Comments. For those interested in C/C++ compiler performance, for some fun numbers to dive into this weekend are LLVM Clang vs. GCC benchmarks atop FreeBSD 11.0 RC1 AMD64 on an Intel Xeon Haswell system. FreeBSD 11.0 continues to ship the LLVM Clang compi