Following this week's release of OpenBSD 6.0, this BSD operating system has added LLVM and its Clang C/C++ compiler to its base archive.

OpenBSD currently makes use of GCC 4.2.1, the latest series of the GNU Compiler Collection being under the GPLv2 license rather than GPLv3. It looks like OpenBSD is finally warming up to using Clang, a move that FreeBSD made years ago along with some other BSD OSes looking for the friendlier-licensed compiler. A few years ago, the Bitrig fork of OpenBSD also switched from GCC to Clang.

As of yesterday, LLVM 3.8.1 is in OpenBSD.