git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375339
91177308-0d34-0410-b5e6-
96231b3b80d8
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
using the same source checkout.
+ The full list is:
+ ``clang;clang-tools-extra;compiler-rt;debuginfo-tests;libc;libclc;libcxx;libcxxabi;libunwind;lld;lldb;llgo;openmp;parallel-libs;polly;pstl``
**LLVM_EXTERNAL_PROJECTS**:STRING
Semicolon-separated list of additional external projects to build as part of