linux和Android的Makefile和android.mk

1. makefile

1.1 gcc的参数

-Wall: 是打开警告开关,

-O:    代表默认优化,可选:-O0不优化,-O1低级优化,-O2中级优化,-O3高级优化,-Os代码空间优化。

-g:     是生成调试信息,生成的可执行文件具有和源代码关联的可调试的信息。 

-I(大写的i):代表后面跟的目录为第一个寻找头文件的目录

-L:     代表后面跟的目录为第一个寻找库文件的目录

-l(小写的L):表示libxxx.so库文件

-static:  静态编译的

 

举例:

gcc -o hello hello.c -I /home/hello/include -L /home/hello/lib -lworld

上面这句表示在编译hello.c时:

-I /home/hello/include表示将/home/hello/include目录作为第一个寻找头文件的目录,寻找的顺序是:/home/hello/include-->/usr/include-->/usr/local/include -L /home/hello/lib表示将/home/hello/lib目录作为第一个寻找库文件的目录,寻找的顺序是:/home/hello/lib-->/lib-->/usr/lib-->/usr/local/lib -lworld表示在上面的lib的路径中寻找libworld.so动态库文件(如果gcc编译选项中加入了“-static”表示寻找libworld.a静态库文件)

 

-c(小写):    只编译,不链接

-C(大写):   切换到指定目录再执行 make 过程,makefile 在这个指定目录里面,然后返回到当前目录继续读入、执行当前的Makefile。

 

2. android.mk

2.1 基本概念

可以生成一下几个类别:

JAVA代码的 C/C++代码的
JAR包 二进制可执行文件:ELF (BUILD_EXECUTABLE)
应用程序:APK 动态库:.so           (BUILD_SHARED_LIBRARY)
  静态库:.a                (BUILD_STATIC_LIBRARY)

 

常用的变量:

名字
含义 常用的方式
LOCAL_PATH
当前模块的相对路径 LOCAL_PATH := $(call my-dir)
LOCAL_MODULE
编译生成的目标名称 LOCAL_MODULE := test
  LOCAL_SRC_FILES 编译该模块需要的源文件 LOCAL_SRC_FILES := test.c
 LOCAL_C_INCLUDES
 包含C的头文件目录  
 LOCAL_SHARED_LIBRARIES  导入共享库  LOCAL_SHARED_LIBRARIES += liblog
     

 

2.2 C/C++可执行文件(ELF)

hejin@desk-ubuntu:/home/desk/myandroid$ ls external/test/
Android.mk  test2.c  test2.h  test.c

 

分别查看四个源文件的内容:

hejin@desk-ubuntu:/home/desk/myandroid$ cat external/test/test.c
#include 
#include "test2.h"
int main(){
        printf("hello world\n");
        test2();
        return 0;
}

 

hejin@desk-ubuntu:/home/desk/myandroid$ cat external/test/test2.c
#include

void test2(){
        printf("hello test2\n");
}

 

hejin@desk-ubuntu:/home/desk/myandroid$ cat external/test/test2.h
void test2();

Android.mk:

hejin@desk-ubuntu:/home/desk/myandroid$ cat external/test/Android.mk
LOCAL_PATH := $(call my-dir)      #定义了当前模块的相对路径
include $(CLEAR_VARS)             #清空当前环境变量, 除了LOCAL_PATH
LOCAL_MODULE := test              #编译生成的目标名称
LOCAL_SRC_FILES := test.c \       #编译该模块需要的源文件
                   test2.c
include $(BUILD_EXECUTABLE)       #编译所生成的目标文件格(在这里是可执行文件)

 

编译:

1. source build/envsetup.sh

2. lunch

3.

hejin@desk-ubuntu:/home/desk/myandroid$ mmm external/test/
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=5.1.1
TARGET_PRODUCT=sabresd_6dq
TARGET_BUILD_VARIANT=user
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a-neon
TARGET_CPU_VARIANT=cortex-a9
TARGET_2ND_ARCH=
TARGET_2ND_ARCH_VARIANT=
TARGET_2ND_CPU_VARIANT=
HOST_ARCH=x86_64
HOST_OS=linux
HOST_OS_EXTRA=Linux-3.16.0-30-generic-x86_64-with-Ubuntu-14.04-trusty
HOST_BUILD_TYPE=release
BUILD_ID=2.1.0-ga-rc3
OUT_DIR=out
============================================
No private recovery resources for TARGET_DEVICE sabresd_6dq
make: Entering directory `/home/desk/myandroid'
target thumb C: test <= external/test/test.c
target thumb C: test <= external/test/test2.c
target Executable: test (out/target/product/sabresd_6dq/obj/EXECUTABLES/test_intermediates/LINKED/test)
target Symbolic: test (out/target/product/sabresd_6dq/symbols/system/bin/test)    
target Strip: test (out/target/product/sabresd_6dq/obj/EXECUTABLES/test_intermediates/test)
Install: out/target/product/sabresd_6dq/system/bin/test    //将可执行文件安装到这个目录下
make: Leaving directory `/home/desk/myandroid'

#### make completed successfully (1 seconds) ####

 查看文件类型:(可以看出来最后为ELF的可执行文件类型)

hejin@desk-ubuntu:/home/desk/myandroid$ file  out/target/product/sabresd_6dq/system/bin/test
out/target/product/sabresd_6dq/system/bin/test: ELF 32-bit LSB  shared object, ARM, EABI5 version 1 (SYSV), dynamically linked (uses shared libs), stripped

 

2.3 C/C++可执行程序(ELF)在android下运行

1.将上面的程序从Linux拿到Windows下

linux和Android的Makefile和android.mk_第1张图片

 

2. 放入android系统中

 

 

3. 进入android系统执行

 linux和Android的Makefile和android.mk_第2张图片

 

2.4 C/C++动态库和静态库

1. 静态库

hejin@desk-ubuntu:/home/desk/myandroid/external/test2$ cat Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := libtest
LOCAL_SRC_FILES := src/test.c \
                src/test2.c
include $(BUILD_STATIC_LIBRARY)

 

hejin@desk-ubuntu:/home/desk/myandroid/external/test2$ mmm .
。。。省略。。。
No private recovery resources for TARGET_DEVICE sabresd_6dq
make: Entering directory `/home/desk/myandroid'
Import includes file: out/target/product/sabresd_6dq/obj/STATIC_LIBRARIES/libtest_intermediates/import_includes
target thumb C: libtest <= external/test2/./src/test.c
target thumb C: libtest <= external/test2/./src/test2.c
Export includes file: external/test2/./Android.mk -- out/target/product/sabresd_6dq/obj/STATIC_LIBRARIES/libtest_intermediates/export_includes
target StaticLib: libtest (out/target/product/sabresd_6dq/obj/STATIC_LIBRARIES/libtest_intermediates/libtest.a)
make: Leaving directory `/home/desk/myandroid'

 

2. 动态库

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := libtest
LOCAL_SRC_FILES := src/test.c \
                src/test2.c
include $(BUILD_SHARED_LIBRARY)

 

2.5 添加头文件,系统库,第三方库,静态库

 

2.6 编译JAVA(未写)

 

转载于:https://www.cnblogs.com/maogefff/p/7910441.html

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