diff --git a/llvm/include/llvm/ADT/Triple.h b/llvm/include/llvm/ADT/Triple.h
--- a/llvm/include/llvm/ADT/Triple.h
+++ b/llvm/include/llvm/ADT/Triple.h
@@ -222,10 +222,11 @@
 
     MSVC,
     Itanium,
+    LLVMLibc,
     Cygnus,
     CoreCLR,
     Simulator, // Simulator variants of other systems, e.g., Apple's iOS
-    MacABI, // Mac Catalyst variant of Apple's iOS deployment target.
+    MacABI,    // Mac Catalyst variant of Apple's iOS deployment target.
     LastEnvironmentType = MacABI
   };
   enum ObjectFormatType {
diff --git a/llvm/lib/Support/Triple.cpp b/llvm/lib/Support/Triple.cpp
--- a/llvm/lib/Support/Triple.cpp
+++ b/llvm/lib/Support/Triple.cpp
@@ -242,11 +242,17 @@
   case GNUABIN32: return "gnuabin32";
   case GNUEABI: return "gnueabi";
   case GNUEABIHF: return "gnueabihf";
-  case GNUX32: return "gnux32";
-  case GNUILP32: return "gnu_ilp32";
+  case GNUX32:
+    return "gnux32";
+  case GNUILP32:
+    return "gnu_ilp32";
   case Itanium: return "itanium";
-  case MSVC: return "msvc";
-  case MacABI: return "macabi";
+  case LLVMLibc:
+    return "llvmlibc";
+  case MSVC:
+    return "msvc";
+  case MacABI:
+    return "macabi";
   case Musl: return "musl";
   case MuslEABI: return "musleabi";
   case MuslEABIHF: return "musleabihf";