LOCAL_EXPORT_C_INCLUDES和LOCAL_C_INCLUDES之间的区别

Question

有人请解释LOCAL_EXPORT_C_INCLUDES和LOCAL_C_INCLUDESandroid 之间有什么区别mk file.

Answer 1

如果模块添加了路径LOCAL_EXPORT_C_INCLUDES,则这些路径将被添加到LOCAL_C_INCLUDES另一个模块的定义中,该模块使用LOCAL_STATIC_LIBRARIES或使用此路径LOCAL_SHARED_LIBRARIES.

考虑我们有2个模块,例如foo和bar,以下是树结构.

.
|-- Android.mk
|-- bar
|   |-- bar.c
|   |-- bar.h
|-- foo
    |-- foo.c
    `-- foo.h

bar使用foo作为静态库.由于bar.c需要包含foo.h,因此foo模块必须添加include路径LOCAL_EXPORT_C_INCLUDES.如果任何模块都没有使用bar,那么它可以添加包含路径LOCAL_C_INCLUDES.

Android.mk将如下所示:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := foo
LOCAL_SRC_FILES := foo/foo.c
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/foo
include $(BUILD_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := bar
LOCAL_SRC_FILES := bar/bar.c
LOCAL_C_INCLUDES := $(LOCAL_PATH)/bar
LOCAL_STATIC_LIBRARIES := foo
include $(BUILD_SHARED_LIBRARY)

请看一下android-ndk示例目录中提供的示例: android-ndk-r9d/samples/module-exports