Move unittest driver to utils/unittest/UnitTestMain.

- This eliminates a race between building the unittests and linking the
   UnitTestMain library.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81719 91177308-0d34-0410-b5e6-96231b3b80d8

utils/unittest/Makefile

@@ -8,6 +8,6 @@
 ##===----------------------------------------------------------------------===##
 
 LEVEL = ../..
-PARALLEL_DIRS = googletest
+PARALLEL_DIRS = googletest UnitTestMain
 
 include $(LEVEL)/Makefile.common

utils/unittest/UnitTestMain/Makefile

@@ -0,0 +1,19 @@
+##===- utils/unittest/UnitTestMain/Makefile ----------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../../..
+
+include $(LEVEL)/Makefile.config
+
+LIBRARYNAME = UnitTestMain
+BUILD_ARCHIVE = 1
+CPP.Flags += -I$(LLVM_SRC_ROOT)/utils/unittest/googletest/include
+CPP.Flags += -Wno-variadic-macros
+
+include $(LEVEL)/Makefile.common

utils/unittest/UnitTestMain/TestMain.cpp

@@ -0,0 +1,15 @@
+//===--- utils/unittest/UnitTestMain/TestMain.cpp - unittest driver -------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+
+int main(int argc, char **argv) {
+  testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}