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: unittests/ADT/TripleTest.cpp
===================================================================
--- unittests/ADT/TripleTest.cpp
+++ unittests/ADT/TripleTest.cpp
@@ -87,6 +87,12 @@
   EXPECT_EQ(Triple::ELFIAMCU, T.getOS());
   EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
 
+  T = Triple("i386-pc-contiki-unknown");
+  EXPECT_EQ(Triple::x86, T.getArch());
+  EXPECT_EQ(Triple::PC, T.getVendor());
+  EXPECT_EQ(Triple::Contiki, T.getOS());
+  EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
+
   T = Triple("x86_64-pc-linux-gnu");
   EXPECT_EQ(Triple::x86_64, T.getArch());
   EXPECT_EQ(Triple::PC, T.getVendor());