Add target libbionic_gtest_main for cts test.

Bug: 17589740
Change-Id: I37f2d3fe72870b9dc867407fa1619c9a6fcd5cbb
diff --git a/tests/Android.mk b/tests/Android.mk
index 38d85f8..3150655 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -212,19 +212,36 @@
 include $(LOCAL_PATH)/Android.build.mk
 
 # -----------------------------------------------------------------------------
+# Library of bionic customized gtest main function.
+# -----------------------------------------------------------------------------
+libBionicGtestMain_src_files := gtest_main.cpp
+
+libBionicGtestMain_cflags := $(test_cflags)
+
+libBionicGtestMain_cppflags := $(test_cppflags)
+
+module := libBionicGtestMain
+module_tag := optional
+build_type := target
+build_target := STATIC_TEST_LIBRARY
+include $(LOCAL_PATH)/Android.build.mk
+build_type := host
+include $(LOCAL_PATH)/Android.build.mk
+
+# -----------------------------------------------------------------------------
 # Tests for the device using bionic's .so. Run with:
 #   adb shell /data/nativetest/bionic-unit-tests/bionic-unit-tests32
 #   adb shell /data/nativetest/bionic-unit-tests/bionic-unit-tests64
 # -----------------------------------------------------------------------------
 bionic-unit-tests_whole_static_libraries := \
     libBionicTests \
+    libBionicGtestMain \
 
 bionic-unit-tests_static_libraries := \
     libtinyxml2 \
     liblog \
 
 bionic-unit-tests_src_files := \
-    gtest_main.cpp \
     atexit_test.cpp \
     dl_test.cpp \
     dlext_test.cpp \
@@ -268,6 +285,7 @@
 # -----------------------------------------------------------------------------
 bionic-unit-tests-static_whole_static_libraries := \
     libBionicTests \
+    libBionicGtestMain \
 
 bionic-unit-tests-static_static_libraries := \
     libm \
@@ -277,9 +295,6 @@
     libtinyxml2 \
     liblog \
 
-bionic-unit-tests-static_src_files := \
-    gtest_main.cpp \
-
 bionic-unit-tests-static_force_static_executable := true
 
 # libc and libc++ both define std::nothrow. libc's is a private symbol, but this
@@ -302,7 +317,6 @@
 ifeq ($(HOST_OS)-$(HOST_ARCH),$(filter $(HOST_OS)-$(HOST_ARCH),linux-x86 linux-x86_64))
 
 bionic-unit-tests-glibc_src_files := \
-    gtest_main.cpp \
     atexit_test.cpp \
     dlfcn_test.cpp \
     dl_test.cpp \
@@ -315,6 +329,7 @@
 
 bionic-unit-tests-glibc_whole_static_libraries := \
     libBionicStandardTests \
+    libBionicGtestMain \
 
 bionic-unit-tests-glibc_ldlibs := \
     -lrt -ldl -lutil \