Index: include/llvm/ADT/Triple.h
===================================================================
--- include/llvm/ADT/Triple.h
+++ include/llvm/ADT/Triple.h
@@ -168,7 +168,8 @@
     TvOS,       // Apple tvOS
     WatchOS,    // Apple watchOS
     Mesa3D,
-    LastOSType = Mesa3D
+    Contiki,
+    LastOSType = Contiki
   };
   enum EnvironmentType {
     UnknownEnvironment,
@@ -483,6 +484,10 @@
            Env == Triple::GNUX32;
   }
 
+  bool isOSContiki() const {
+    return getOS() == Triple::Contiki;
+  }
+
   /// Checks if the environment could be MSVC.
   bool isWindowsMSVCEnvironment() const {
     return getOS() == Triple::Win32 &&
Index: lib/Support/Triple.cpp
===================================================================
--- lib/Support/Triple.cpp
+++ lib/Support/Triple.cpp
@@ -192,6 +192,7 @@
   case TvOS: return "tvos";
   case WatchOS: return "watchos";
   case Mesa3D: return "mesa3d";
+  case Contiki: return "contiki";
   }
 
   llvm_unreachable("Invalid OSType");
@@ -463,6 +464,7 @@
     .StartsWith("tvos", Triple::TvOS)
     .StartsWith("watchos", Triple::WatchOS)
     .StartsWith("mesa3d", Triple::Mesa3D)
+    .StartsWith("contiki", Triple::Contiki)
     .Default(Triple::UnknownOS);
 }
 
Index: lib/Target/X86/X86Subtarget.h
===================================================================
--- lib/Target/X86/X86Subtarget.h
+++ lib/Target/X86/X86Subtarget.h
@@ -491,6 +491,7 @@
   bool isTargetNaCl32() const { return isTargetNaCl() && !is64Bit(); }
   bool isTargetNaCl64() const { return isTargetNaCl() && is64Bit(); }
   bool isTargetMCU() const { return TargetTriple.isOSIAMCU(); }
+  bool isTargetContiki() const { return TargetTriple.isOSContiki(); }
 
   bool isTargetWindowsMSVC() const {
     return TargetTriple.isWindowsMSVCEnvironment();