diff --git a/llvm/cmake/modules/LLVMExternalProjectUtils.cmake b/llvm/cmake/modules/LLVMExternalProjectUtils.cmake
--- a/llvm/cmake/modules/LLVMExternalProjectUtils.cmake
+++ b/llvm/cmake/modules/LLVMExternalProjectUtils.cmake
@@ -238,8 +238,12 @@
   endif()
 
   if(CMAKE_CROSSCOMPILING)
-    set(compiler_args -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    set(compiler_args -DCMAKE_ASM_COMPILER=${CMAKE_ASM_COMPILER}
+                      -DCMAKE_ASM_COMPILER_TARGET=${ARG_TARGET_TRIPLE}
+                      -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+                      -DCMAKE_C_COMPILER_TARGET=${ARG_TARGET_TRIPLE}
                       -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+                      -DCMAKE_CXX_COMPILER_TARGET=${ARG_TARGET_TRIPLE}
                       -DCMAKE_LINKER=${CMAKE_LINKER}
                       -DCMAKE_AR=${CMAKE_AR}
                       -DCMAKE_RANLIB=${CMAKE_RANLIB}