LLVM Clang vs. GCC Compiler Benchmarks On FreeBSD 11.0

Starting off with SQLite, it's runtime performance wasn't affected by the different compilers tested on FreeBSD 11.

With FFTW, the GCC compilers had a very slight lead over LLVM Clang.

With the OpenMP-using GraphicsMagick, all of the tested GCC compilers were much faster than LLVM Clang. It appears the OpenMP performance for this test is much lower with Clang or there's some other issue concerning the OpenMP support with FreeBSD's Clang package. With these results also note the performance improvement when moving from GCC 4.x to GCC 5.x.