diff --git a/llvm/cmake/config.guess b/llvm/cmake/config.guess
--- a/llvm/cmake/config.guess
+++ b/llvm/cmake/config.guess
@@ -922,6 +922,9 @@
     ia64:Linux:*:*)
 	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
+    loongarch32:Linux:*:* | loongarch64:Linux:*:* | loongarchx32:Linux:*:*)
+	echo "${UNAME_MACHINE}-unknown-linux-${LIBC}"
+	exit ;;
     m32r*:Linux:*:*)
 	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;