Apply LOCAL_CXX_STL to also prebuilts.

Because LOCAL_CXX_STL modifies a module's required shared libaries,
we need this for also prebuilt shared libraries and executables.

Change-Id: I418c26143999a613c40aadf990f131b123e0ac3d

core/cxx_stl_setup.mk

@@ -0,0 +1,67 @@
+#############################################################
+## Set up flags based on LOCAL_CXX_STL.
+## Input variables: LOCAL_CXX_STL
+## Output variables: My_cflags, my_c_includes, my_shared_libraries, etc.
+#############################################################
+
+# Only around for development purposes. Will be removed soon.
+my_libcxx_is_default := false
+
+# Select the appropriate C++ STL
+ifeq ($(strip $(LOCAL_CXX_STL)),default)
+    ifndef LOCAL_SDK_VERSION
+        ifeq ($(strip $(my_libcxx_is_default)),true)
+            # Platform code. Select the appropriate STL.
+            my_cxx_stl := libc++
+        else
+            my_cxx_stl := bionic
+        endif
+    else
+        my_cxx_stl := ndk
+    endif
+else
+    my_cxx_stl := $(strip $(LOCAL_CXX_STL))
+endif
+
+ifneq ($(filter $(my_cxx_stl),libc++ libc++_static),)
+    my_cflags += -D_USING_LIBCXX
+    my_c_includes += external/libcxx/include
+    ifeq ($(my_cxx_stl),libc++)
+        my_shared_libraries += libc++
+    else
+        my_static_libraries += libc++_static
+    endif
+
+    ifdef LOCAL_IS_HOST_MODULE
+        my_cppflags += -nostdinc++
+        my_ldflags += -nodefaultlibs
+        my_ldlibs += -lc -lm
+    endif
+else ifneq ($(filter $(my_cxx_stl),stlport stlport_static),)
+    my_c_includes += external/stlport/stlport bionic/libstdc++/include bionic
+    ifeq ($(my_cxx_stl),stlport)
+        my_shared_libraries += libstdc++ libstlport
+    else
+        my_static_libraries += libstdc++ libstlport_static
+    endif
+else ifeq ($(my_cxx_stl),ndk)
+    # Using an NDK STL. Handled farther up in this file.
+    ifndef LOCAL_IS_HOST_MODULE
+        my_system_shared_libraries += libstdc++
+    endif
+else ifeq ($(my_cxx_stl),bionic)
+    # Using bionic's basic libstdc++. Not actually an STL. Only around until the
+    # tree is in good enough shape to not need it.
+    ifndef LOCAL_IS_HOST_MODULE
+        my_c_includes += bionic/libstdc++/include
+        my_system_shared_libraries += libstdc++
+    endif
+    # Host builds will use GNU libstdc++.
+else ifeq ($(my_cxx_stl),none)
+    ifdef LOCAL_IS_HOST_MODULE
+        my_cppflags += -nostdinc++
+        my_ldflags += -nodefaultlibs -lc -lm
+    endif
+else
+    $(error $(my_cxx_stl) is not a supported STL.)
+endif