[CMake] Add dependencies to gtest.

llvm-svn: 201079
diff --git a/llvm/utils/unittest/UnitTestMain/CMakeLists.txt b/llvm/utils/unittest/UnitTestMain/CMakeLists.txt
index e217d18..5f3e6c1 100644
--- a/llvm/utils/unittest/UnitTestMain/CMakeLists.txt
+++ b/llvm/utils/unittest/UnitTestMain/CMakeLists.txt
@@ -1,3 +1,9 @@
 add_llvm_library(gtest_main
   TestMain.cpp
   )
+
+# Depends on llvm::cl
+target_link_libraries(gtest_main
+  gtest
+  LLVMSupport
+  )