diff --git a/llvm/cmake/modules/CrossCompile.cmake b/llvm/cmake/modules/CrossCompile.cmake
--- a/llvm/cmake/modules/CrossCompile.cmake
+++ b/llvm/cmake/modules/CrossCompile.cmake
@@ -6,7 +6,7 @@
 
   if(NOT DEFINED ${project_name}_${target_name}_BUILD)
     set(${project_name}_${target_name}_BUILD
-      "${CMAKE_BINARY_DIR}/${target_name}")
+      "${CMAKE_CURRENT_BINARY_DIR}/${target_name}")
     set(${project_name}_${target_name}_BUILD
       ${${project_name}_${target_name}_BUILD} PARENT_SCOPE)
     message(STATUS "Setting native build dir to " ${${project_name}_${target_name}_BUILD})
@@ -68,7 +68,7 @@
   add_custom_command(OUTPUT ${${project_name}_${target_name}_BUILD}/CMakeCache.txt
     COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}"
         -DCMAKE_MAKE_PROGRAM="${CMAKE_MAKE_PROGRAM}"
-        ${CROSS_TOOLCHAIN_FLAGS_${target_name}} ${CMAKE_SOURCE_DIR}
+        ${CROSS_TOOLCHAIN_FLAGS_${target_name}} ${CMAKE_CURRENT_SOURCE_DIR}
         ${CROSS_TOOLCHAIN_FLAGS_${project_name}_${target_name}}
         -DLLVM_TARGET_IS_CROSSCOMPILE_HOST=TRUE
         -DLLVM_TARGETS_TO_BUILD="${targets_to_build_arg}"
@@ -99,17 +99,17 @@
   cmake_parse_arguments(ARG "" "" "DEPENDS" ${ARGN})
 
   if(CMAKE_CONFIGURATION_TYPES)
-    set(output_path "${${CMAKE_PROJECT_NAME}_NATIVE_BUILD}/Release/bin/${target}")
+    set(output_path "${${PROJECT_NAME}_NATIVE_BUILD}/Release/bin/${target}")
   else()
-    set(output_path "${${CMAKE_PROJECT_NAME}_NATIVE_BUILD}/bin/${target}")
+    set(output_path "${${PROJECT_NAME}_NATIVE_BUILD}/bin/${target}")
   endif()
 
-  llvm_ExternalProject_BuildCmd(build_cmd ${target} ${${CMAKE_PROJECT_NAME}_NATIVE_BUILD}
+  llvm_ExternalProject_BuildCmd(build_cmd ${target} ${${PROJECT_NAME}_NATIVE_BUILD}
                                 CONFIGURATION Release)
   add_custom_command(OUTPUT "${output_path}"
                      COMMAND ${build_cmd}
-                     DEPENDS CONFIGURE_${CMAKE_PROJECT_NAME}_NATIVE ${ARG_DEPENDS}
-                     WORKING_DIRECTORY "${${CMAKE_PROJECT_NAME}_NATIVE_BUILD}"
+                     DEPENDS CONFIGURE_${PROJECT_NAME}_NATIVE ${ARG_DEPENDS}
+                     WORKING_DIRECTORY "${${PROJECT_NAME}_NATIVE_BUILD}"
                      COMMENT "Building native ${target}..."
                      USES_TERMINAL)
   set(${output_path_var} "${output_path}" PARENT_SCOPE)