编译自己的库

有个问题是Lunix的编译版本和androidstudio的NDK版本最好一致

编译环境

ARM:

export mygcc=/home/zchw/android-ndk-r17c/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc

X86:

export ix86="/root/android-ndk-r17b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc"

ARM64:

export myArm64="/home/zchw/android-ndk-r17c/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-gcc"

编译引用文件路径

ARM:

export hello="--sysroot=/home/zchw/android-ndk-r17c/platforms/android-21/arch-arm -isystem /home/zchw/android-ndk-r17c/sysroot/usr/include -isystem /home/zchw/android-ndk-r17c/sysroot/usr/include/arm-linux-androideabi"

X86:

export hello86="--sysroot=/home/zchw/android-ndk-r17c/platforms/android-21/arch-x86 -isystem /home/zchw/android-ndk-r17c/sysroot/usr/include -isystem /home/zchw/android-ndk-r17c/sysroot/usr/include/i686-linux-android"

ARM64:

export hello64="--sysroot=/home/zchw/android-ndk-r17c/platforms/android-21/arch-arm64 -isystem /home/zchw/android-ndk-r17c/sysroot/usr/include -isystem /home/zchw/android-ndk-r17c/sysroot/usr/include/aarch64-linux-android"

hello -pie main.c -o main
// -pie与位置无关，编译可执行文件
//-fPIC给动态库使用，编译动态库

file main 查看编译后文件类型

编译动态库

$mygcc $hello -fPIC -shared test.c -o libTest.so
$ix86 $hello86 -fPIC -shared test.c -o libTest.so
$myArm64 $hello64 -fPIC -shared test.c -o libTest.so

查看动态库里面的方法 cmd

D:\adt\SDK\ndk-bundle\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64\bin\arm-linux-androideabi-nm.exe C:\Users\zchw\Desktop\libTest.so

tar包解压

tar xvf ffmpeg-4.1.5.tar.bz2

解包：tar xvf FileName.tar
打包：tar cvf FileName.tar DirName

多个库编程so

--sysroot=/root/android-ndk-r17b/platforms/android-21/arch-arm/ -shared -o libffmpeg.so -wl,--whole-archive libavcodec.a lib avformat.a libavutil.a libswresample.a libswscale.a libavfilter.a -wl,--no-whole-archive

Message输出文件

build_output.txt

sudo mv 'android-ndk-r19c-linux-x86_64.zip?hl=zh_cn' zchw

查看依赖

ndk-bundle / ndk-depends查看依赖
cmd
ndk-bundle\ndk-depends.cmd xxx.so

/home/zchw/android-ndk-r19c/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin