Index: llvm/CMakeLists.txt
===================================================================
--- llvm/CMakeLists.txt
+++ llvm/CMakeLists.txt
@@ -176,6 +176,9 @@
   endif()
 endif()
 
+set(LLVM_EXTERNAL_PROJECT_BUILD_TOOL_ARGS "" CACHE STRING
+  "Optional arguments for the native tool used in CMake --build invocations for external projects.")
+
 option(LLVM_DEPENDENCY_DEBUGGING "Dependency debugging mode to verify correctly expressed library dependencies (Darwin only)" OFF)
 
 # Some features of the LLVM build may be disallowed when dependency debugging is
Index: llvm/cmake/modules/LLVMExternalProjectUtils.cmake
===================================================================
--- llvm/cmake/modules/LLVMExternalProjectUtils.cmake
+++ llvm/cmake/modules/LLVMExternalProjectUtils.cmake
@@ -11,8 +11,14 @@
     # Use special command for Makefiles to support parallelism.
     set(${out_var} "$(MAKE)" "-C" "${bin_dir}" "${target}" PARENT_SCOPE)
   else()
+    set(tool_args "${LLVM_EXTERNAL_PROJECT_BUILD_TOOL_ARGS}")
+    if(NOT tool_args STREQUAL "")
+      string(CONFIGURE "${tool_args}" tool_args @ONLY)
+      string(PREPEND tool_args "-- ")
+      separate_arguments(tool_args UNIX_COMMAND "${tool_args}")
+    endif()
     set(${out_var} ${CMAKE_COMMAND} --build ${bin_dir} --target ${target}
-                                    --config ${ARG_CONFIGURATION} PARENT_SCOPE)
+                                    --config ${ARG_CONFIGURATION} ${tool_args} PARENT_SCOPE)
   endif()
 endfunction()