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
@@ -15,6 +15,9 @@
   if (EXISTS ${LLVM_MAIN_SRC_DIR}/cmake/platforms/${toolchain}.cmake)
     set(CROSS_TOOLCHAIN_FLAGS_INIT
       -DCMAKE_TOOLCHAIN_FILE=\"${LLVM_MAIN_SRC_DIR}/cmake/platforms/${toolchain}.cmake\")
+  elseif (CMAKE_CROSSCOMPILING)
+    set(CROSS_TOOLCHAIN_FLAGS_INIT
+      )
   else()
     set(CROSS_TOOLCHAIN_FLAGS_INIT
       -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}