diff --git a/llvm/cmake/config-ix.cmake b/llvm/cmake/config-ix.cmake
--- a/llvm/cmake/config-ix.cmake
+++ b/llvm/cmake/config-ix.cmake
@@ -498,6 +498,8 @@
   set(LLVM_NATIVE_ARCH RISCV)
 elseif (LLVM_NATIVE_ARCH STREQUAL "m68k")
   set(LLVM_NATIVE_ARCH M68k)
+elseif (LLVM_NATIVE_ARCH MATCHES "loongarch")
+  set(LLVM_NATIVE_ARCH LoongArch)
 else ()
   message(FATAL_ERROR "Unknown architecture ${LLVM_NATIVE_ARCH}")
 endif ()