自动添加需要编译的源文件Android.mk模板

自动添加需要编译的源文件列表

添加第三方静态库、动态库的依赖

假设我们的项目依赖 libmath.a, libjson.a, libffmpeg.so 这几个第三方库文件，项目包含如下几个模块：algorithm，core，network，utils，tests，每个模块都有若干个.c/.h文件，我们要把整个工程编译为动态库，并通过 native_sdk.c 中的函数向Java层提供调用接口。

LOCAL_PATH := $(call my-dir)

3RD_INC_DIR = $(LOCAL_PATH)/3rd/inc

3RD_LIB_DIR = $(LOCAL_PATH)/3rd/libs

# Prebuild the 3rd libraries

include $(CLEAR_VARS)

LOCAL_MODULE := math

LOCAL_SRC_FILES := $(3RD_LIB_DIR)/libmath.a

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := json

LOCAL_SRC_FILES := $(3RD_LIB_DIR)/libjson.a

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := ffmpeg

LOCAL_SRC_FILES := $(3RD_LIB_DIR)/libffmpeg.so

include $(PREBUILT_SHARED_LIBRARY)

# Build native sdk

include $(CLEAR_VARS)

LOCAL_MODULE := native_sdk

LOCAL_SRC_FILES := \

$(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/algorithm/*.c)) \

$(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/core/*.c)) \

$(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/network/*.c)) \

$(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/utils/*.c)) \

$(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/*.c))

LOCAL_C_INCLUDES := $(3RD_INC_DIR)

LOCAL_C_INCLUDES += $(LOCAL_PATH)/src

LOCAL_C_INCLUDES += $(LOCAL_PATH)/src/algorithm

LOCAL_C_INCLUDES += $(LOCAL_PATH)/src/core

LOCAL_C_INCLUDES += $(LOCAL_PATH)/src/network

LOCAL_C_INCLUDES += $(LOCAL_PATH)/src/utils

LOCAL_CFLAGS := -DANDROID

LOCAL_LDLIBS := -llog

LOCAL_STATIC_LIBRARIES := math json

LOCAL_SHARED_LIBRARIES := ffmpeg

include $(BUILD_SHARED_LIBRARY)

# Build tests

include $(CLEAR_VARS)

LOCAL_MODULE := test.out

LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/tests/*.c))

LOCAL_CFLAGS := -DANDROID

LOCAL_C_INCLUDES := $(LOCAL_PATH)/src

LOCAL_LDLIBS := -llog -fPIE -pie

LOCAL_SHARED_LIBRARIES:= native_sdk

include $(BUILD_EXECUTABLE)

对于 Android.mk 而言，如果要依赖第三方库文件，则必须添加 PREBUILT_XXXX_LIBRARY 进行预编译，LOCAL_SRC_FILES 宏给出了需要编译的源文件列表，

这里我通过 subst和wildcard 这两个函数，实现了自动扫描指定目录下的源文件，最后，通过 BUILD_EXECUTABLE 编译出可以运行于adb shell命令行的可执行程序，用于做代码的单元测试。

附：

:= 是覆盖之前的值

?= 是如果没有被赋值过就赋予等号后面的值

+= 是添加等号后面的值

make会将整个makefile展开后，再决定变量的值。也就是说，变量的值将会是整个makefile中最后被指定的值。看例子：

x = foo

y = $(x) bar

x = xyz

在上例中，y的值将会是 xyz bar ，而不是 foo bar 。

“:=”表示变量的值决定于它在makefile中的位置，而不是整个makefile展开后的最终值。

x := foo

y := $(x) bar

x := xyz

在上例中，y的值将会是 foo bar ，而不是 xyz bar 了。

参考：

http://ticktick.blog.51cto.com/823160/1733500/

巴特西

自动添加需要编译的源文件Android.mk模板

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