**LLVM_ENABLE_PROJECTS**:STRING
Semicolon-separated list of projects to build, or *all* for building all
- (clang, libcxx, libcxxabi, lldb, compiler-rt, lld, polly) projects.
+ (clang, libcxx, libcxxabi, lldb, compiler-rt, lld, polly, etc) projects.
This flag assumes that projects are checked out side-by-side and not nested,
i.e. clang needs to be in parallel of llvm instead of nested in `llvm/tools`.
This feature allows to have one build for only LLVM and another for clang+llvm