Improve Triple to recognize the OS in i386-mingw32.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79359 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/ADT/TripleTest.cpp b/unittests/ADT/TripleTest.cpp
index cbb2ea4..1a9e81a 100644
--- a/unittests/ADT/TripleTest.cpp
+++ b/unittests/ADT/TripleTest.cpp
@@ -92,6 +92,18 @@
 
   T = Triple("huh");
   EXPECT_EQ(Triple::UnknownArch, T.getArch());
+
+  // Two exceptional cases.
+
+  T = Triple("i386-mingw32");
+  EXPECT_EQ(Triple::x86, T.getArch());
+  EXPECT_EQ(Triple::PC, T.getVendor());
+  EXPECT_EQ(Triple::MinGW32, T.getOS());
+
+  T = Triple("arm-elf");
+  EXPECT_EQ(Triple::arm, T.getArch());
+  EXPECT_EQ(Triple::UnknownVendor, T.getVendor());
+  EXPECT_EQ(Triple::UnknownOS, T.getOS());
 }
 
 TEST(TripleTest, MutateName) {