Set up rules to build static libraries for TARGET_2ND_ARCH

The rules for the 2nd arch are set up in the second inclusion
of static_library_internal.mk.
libfoo of the 2nd arch will be built into
$(PRODUCT_OUT)/obj_$(TARGET_2ND_ARCH)/libfoo_intermediates/libfoo.a.

Bug: 11654773
Change-Id: I1d92733968fc442e9225b4df5bd1b551a81d89f7
diff --git a/core/static_library_internal.mk b/core/static_library_internal.mk
new file mode 100644
index 0000000..2d3468c
--- /dev/null
+++ b/core/static_library_internal.mk
@@ -0,0 +1,34 @@
+###########################################################
+## Standard rules for building a static library.
+##
+## Additional inputs from base_rules.make:
+## None.
+##
+## LOCAL_MODULE_SUFFIX will be set for you.
+###########################################################
+
+ifeq ($(strip $(LOCAL_MODULE_CLASS)),)
+LOCAL_MODULE_CLASS := STATIC_LIBRARIES
+endif
+ifeq ($(strip $(LOCAL_MODULE_SUFFIX)),)
+LOCAL_MODULE_SUFFIX := .a
+endif
+LOCAL_UNINSTALLABLE_MODULE := true
+ifneq ($(strip $(LOCAL_MODULE_STEM)$(LOCAL_BUILT_MODULE_STEM)),)
+$(error $(LOCAL_PATH): Cannot set module stem for a library)
+endif
+
+include $(BUILD_SYSTEM)/binary.mk
+
+ifeq ($(LOCAL_RAW_STATIC_LIBRARY),true)
+LOCAL_RAW_STATIC_LIBRARY:=
+$(all_objects) : PRIVATE_TARGET_PROJECT_INCLUDES :=
+$(all_objects) : PRIVATE_TARGET_C_INCLUDES :=
+$(all_objects) : PRIVATE_TARGET_GLOBAL_CFLAGS :=
+$(all_objects) : PRIVATE_TARGET_GLOBAL_CPPFLAGS :=
+endif
+
+$(LOCAL_BUILT_MODULE): PRIVATE_2ND_ARCH_VAR_PREFIX := $(LOCAL_2ND_ARCH_VAR_PREFIX)
+$(LOCAL_BUILT_MODULE) : $(built_whole_libraries)
+$(LOCAL_BUILT_MODULE) : $(all_objects)
+	$(transform-o-to-static-lib)