Use libc++ versions of gtest libs when needed

Change-Id: I19aa58a83a9da680d441af5f3956a2fbdf18c4e4
diff --git a/core/target_test_internal.mk b/core/target_test_internal.mk
index 7b99678..60a7c9e 100644
--- a/core/target_test_internal.mk
+++ b/core/target_test_internal.mk
@@ -5,6 +5,9 @@
 LOCAL_CFLAGS += -DGTEST_OS_LINUX_ANDROID -DGTEST_HAS_STD_STRING
 
 LOCAL_C_INCLUDES += external/gtest/include
+ifneq ($(filter libc++,$(LOCAL_SHARED_LIBRARIES)),)
+LOCAL_STATIC_LIBRARIES += libgtest_libcxx libgtest_main_libcxx
+else
 LOCAL_STATIC_LIBRARIES += libgtest libgtest_main
 
 ifndef LOCAL_SDK_VERSION
@@ -14,6 +17,7 @@
 LOCAL_SHARED_LIBRARIES += libstlport
 LOCAL_STATIC_LIBRARIES += libstdc++
 endif
+endif
 
 ifndef LOCAL_MODULE_PATH
 LOCAL_MODULE_PATH := $(TARGET_OUT_DATA_NATIVE_TESTS)/$(LOCAL_MODULE)