Index: llvm/include/llvm/BinaryFormat/MachO.h
===================================================================
--- llvm/include/llvm/BinaryFormat/MachO.h
+++ llvm/include/llvm/BinaryFormat/MachO.h
@@ -494,7 +494,8 @@
   PLATFORM_MACCATALYST = 6,
   PLATFORM_IOSSIMULATOR = 7,
   PLATFORM_TVOSSIMULATOR = 8,
-  PLATFORM_WATCHOSSIMULATOR = 9
+  PLATFORM_WATCHOSSIMULATOR = 9,
+  PLATFORM_DRIVERKIT = 10
 };
 
 // Values for tools enum in build_tool_version.
Index: llvm/include/llvm/Object/MachO.h
===================================================================
--- llvm/include/llvm/Object/MachO.h
+++ llvm/include/llvm/Object/MachO.h
@@ -615,6 +615,7 @@
     case MachO::PLATFORM_IOSSIMULATOR: return "iossimulator";
     case MachO::PLATFORM_TVOSSIMULATOR: return "tvossimulator";
     case MachO::PLATFORM_WATCHOSSIMULATOR: return "watchossimulator";
+    case MachO::PLATFORM_DRIVERKIT: return "driverkit";
     default:
       std::string ret;
       raw_string_ostream ss(ret);
Index: llvm/lib/MC/MCAsmStreamer.cpp
===================================================================
--- llvm/lib/MC/MCAsmStreamer.cpp
+++ llvm/lib/MC/MCAsmStreamer.cpp
@@ -573,6 +573,7 @@
   case MachO::PLATFORM_IOSSIMULATOR:     return "iossimulator";
   case MachO::PLATFORM_TVOSSIMULATOR:    return "tvossimulator";
   case MachO::PLATFORM_WATCHOSSIMULATOR: return "watchossimulator";
+  case MachO::PLATFORM_DRIVERKIT:        return "driverkit";
   }
   llvm_unreachable("Invalid Mach-O platform type");
 }
Index: llvm/lib/MC/MCParser/DarwinAsmParser.cpp
===================================================================
--- llvm/lib/MC/MCParser/DarwinAsmParser.cpp
+++ llvm/lib/MC/MCParser/DarwinAsmParser.cpp
@@ -1152,6 +1152,7 @@
   case MachO::PLATFORM_IOSSIMULATOR:     /* silence warning */ break;
   case MachO::PLATFORM_TVOSSIMULATOR:    /* silence warning */ break;
   case MachO::PLATFORM_WATCHOSSIMULATOR: /* silence warning */ break;
+  case MachO::PLATFORM_DRIVERKIT:        /* silence warning */ break;
   }
   llvm_unreachable("Invalid mach-o platform type");
 }