Building BRL-CAD with Clang LLVM Trunk on Ubuntu 14.04 LTS - Marc Tannous

1. Navigated to the "Getting Started" page of the LLVM project : http://clang.llvm.org/get_started.html
2. Got the required tools for building Clang : GCC, Clang, GNU Make, Python, GNU M4, GNU Autoconf, GNU Automake, libtool, zlib
3. Ran "svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm" in my terminal to checkout LLVM
4. Navigated to "llvm/tools" and ran "svn co http://llvm.org/svn/llvm-project/cfe/trunk clang" in my terminal to checkout Clang
5. Navigated to "llvm/projects" and ran "svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt" to checkout Compiler-RT
6. Ran "mkdir build" for building without polluting the source code
7. Ran "../llvm/configure" and then "make" to build both LLVM and Clang for Debug mode
8. This took upwards of 2 hours without enabling optimizations, despite being on a quad-core ivy bridge i5 + 8gigs of ram with close to no apps running in parallel.
9. I used "sudo update-alternatives --config c++" to change the default compiler from g++ to the newly installed clang++
10. Updated my brlcad repo to make sure I'm running an up-to-date version
10. Created a new directory inside my brlcad trunk, ".build" and ran "cmake .. -DBRLCAD_ENABLE_STRICT=NO -DBRLCAD_BUNDLED_LIBS=ON -DCMAKE_BUILD_TYPE=Release"
11. Success : "Elapsed configuration time..: 53 seconds
-- Configuring done
-- Generating done
-- Build files have been written to: /home/marc/brlcad-svn-trunk/.build"
12. Ran "make"
13. Another success : "Done.
BRL-CAD Release 7.25.0, Build 20150105
Elapsed compilation time: 6 minutes 36 seconds"