使用Clion优雅开发和调试Android Native C/C++源码

环境：
Windows 11 + wsl2 Ubuntu18.04
Ubuntu下同理

一，Clion安装和注册

1.1 下载clion应用和注册软件

CLion-2023.1.2.tar.gz: 应用可以直接从官方下载
自行解决注册问题，方法同IDEA。

1.2 启动clion

$ tar -zxvf CLion-2023.1.2.tar.gz
$ ./clion-2023.1.2/bin/clion.sh
后台启动
$ nohup ./clion-2023.1.2/bin/clion.sh &

二，Android project导入

2.1 编译生成cmake project

$ source build/envsetup.sh
$ lunch
$ export SOONG_GEN_CMAKEFILES=1
$ export SOONG_GEN_CMAKEFILES_DEBUG=1
$ make nothing
$ mv development/ide/clion/frameworks/native/CMakeLists.txt out/development/ide/clion/frameworks/native/
$ mv out/development/ide/clion/* development/ide/clion/

2.2 open project

clion从{SOURCE}/development/ide/clion/frameworks/native打开项目

x86项目的统一将development/ide/clion/frameworks/native/CMakeLists.txt下arm换成x86_64

修改settings-->Toolchains换成和CMakefiles.txt定义的一致

然后点Reload CMake Project, 无错误说明项目导入成功。

2.3 Change Project Root

点击Tools-->CMake-->Change Project Root改变项目根目录为源码目录{SOURCE}/frameworks/native/

打开代码，可以Find Usages说明正常使用

三，调试

3.1 clion设置

点击 Run –> Edit configurations, 然后选择Remote Debug, 配置设置为:

Debugger: Bundled GDB
'target remote' arg: :12345 (如果是远程环境需要加上ip, 如ip:12345)
Sysroot: /home/huangqw/code/out/target/product/blueline/symbols

3.2 创建.gdbinit文件

vim ~/.gdbinit

set dir /home/huangqw/code
set solib-absolute-prefix /home/huangqw/code/out/target/product/blueline/symbols
set solib-search-path /home/huangqw/code/out/target/product/blueline/symbols/system/lib64:/home/huangqw/code/out/target/product/blueline/symbols/system/lib64/hw:/home/huangqw/code/out/target/product/blueline/symbols/system/lib64/ssl/engines:/home/huangqw/code/out/target/product/blueline/symbols/system/lib64/drm:/home/huangqw/code/out/target/product/blueline/symbols/system/lib64/egl:/home/huangqw/code/out/target/product/blueline/symbols/system/lib64/soundfx:/home/huangqw/code/out/target/product/blueline/symbols/vendor/lib64:/home/huangqw/code/out/target/product/blueline/symbols/vendor/lib64/hw:/home/huangqw/code/out/target/product/blueline/symbols/vendor/lib64/egl

3.3 adb连接手机

adb root
adb forward tcp:12345 tcp:12345
adb shell
blueline:/ # gdbserver64 :12345 --attach `pidof surfaceflinger`
    Attached; pid = 654
    gdbserver: Unable to determine the number of hardware watchpoints available.
    gdbserver: Unable to determine the number of hardware breakpoints available.
    Listening on port 12345

3.4 运行断点调试

回到CLion中，点击Run –> Debug “Unnamed” 开始调试
在截屏代码下打个断点，如SurfaceFlinger::renderScreenImplLocked

然后手动截图，成功断点如上图，接下来就可以单步运行，正常的话可以打开项目外的系统库文件。如图所示堆栈里的Looper函数。如显示的是汇编代码则不正常, 请检查.gdbinit文件，或者在gdb终端里set dir “xxx” 设置源码目录

3.5 变量显示optimized out问题

调试时变量显示optimized out，无法正常查看。这是由于C++编译优化的原因，在Android.bp的cflags里加个”-O0”，重新编译surfaceflinger， push生成即可。