Index: cmake/config-ix.cmake
===================================================================
--- cmake/config-ix.cmake
+++ cmake/config-ix.cmake
@@ -417,7 +417,9 @@
 
 find_program(GOLD_EXECUTABLE NAMES ${LLVM_DEFAULT_TARGET_TRIPLE}-ld.gold ld.gold ${LLVM_DEFAULT_TARGET_TRIPLE}-ld ld DOC "The gold linker")
 
-list(REMOVE_DUPLICATES COMPILER_RT_SUPPORTED_ARCH)
+if(COMPILER_RT_SUPPORTED_ARCH)
+  list(REMOVE_DUPLICATES COMPILER_RT_SUPPORTED_ARCH)
+endif()
 message(STATUS "Compiler-RT supported architectures: ${COMPILER_RT_SUPPORTED_ARCH}")
 
 if(ANDROID)