Index: libcxxabi/CMakeLists.txt
===================================================================
--- libcxxabi/CMakeLists.txt
+++ libcxxabi/CMakeLists.txt
@@ -481,7 +481,7 @@
 add_subdirectory(src)
 
 if (LIBCXXABI_INCLUDE_TESTS)
-  if (LIBCXXABI_STANDALONE_BUILD AND NOT LIBCXXABI_ENABLE_SHARED)
+  if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR AND NOT LIBCXXABI_ENABLE_SHARED)
     # We can't reasonably test the system C++ library with a static
     # libc++abi.  We either need to be able to replace libc++abi at
     # run time (with a shared libc++abi), or we need to be able to
Index: libunwind/CMakeLists.txt
===================================================================
--- libunwind/CMakeLists.txt
+++ libunwind/CMakeLists.txt
@@ -363,6 +363,6 @@
   add_subdirectory(docs)
 endif()
 
-if (EXISTS ${LLVM_CMAKE_PATH})
+if (NOT CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR EXISTS ${LLVM_CMAKE_PATH})
   add_subdirectory(test)
 endif()