Cached CMake variables need to have a prefix so they don't collide with other projects. This change (a lot of simple changes) simply prefixes cached variables with LIBOMP_ and sets all of these variables to UPPERCASE which is convention. e.g., os => LIBOMP_OS, ompt_support => LIBOMP_OMPT_SUPPORT. Differential Revision: http://reviews.llvm.org/D9829 git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@237845 91177308-0d34-0410-b5e6-96231b3b80d8