[CMake] Correct configuration order of the sub-projects based on ther dependancies

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283698 91177308-0d34-0410-b5e6-96231b3b80d8

Author: EricWF

projects/CMakeLists.txt

@@ -22,11 +22,11 @@ if(${LLVM_BUILD_RUNTIME})
   # MSVC isn't quite working with libc++ yet, disable it until issues are
   # fixed.
   if(NOT MSVC)
-    # libc++ uses the libc++abi target names so libc++abi should be added
-    # first.
+    # Add the projects in reverse order of their dependencies so that the
+    # dependent projects can see the target names of their dependencies.
+    add_llvm_external_project(libunwind)
     add_llvm_external_project(libcxxabi)
     add_llvm_external_project(libcxx)
-    add_llvm_external_project(libunwind)
   endif()
   if(NOT LLVM_BUILD_EXTERNAL_COMPILER_RT)
     add_llvm_external_project(compiler-rt)