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标题: OpenHarmony的2种快速编译方法 [打印本页]

作者: 深开鸿_王石 时间: 2023-12-18 16:20
标题: OpenHarmony的2种快速编译方法
[md]### 简介

**通过./build.sh脚本进行编译，是OpenHarmony官方推荐的编译程序的方法。但是这样的方法牵扯方便广，速度慢，接下来我们来熟悉下OpenHarmony的另外两种编译方法。**

### GCC编译方法

1. **工具链位置：**
```
[源码路径]/prebuilts/gcc/linux-x86/arm/gcc-linaro-7.5.0-arm-linux-gnueabi/bin/
```
2. **编译命令：**
```
arm-linux-gnueabi-gcc -static helloworld.c -o gcchelloworld
```
3. **方法解析：**
**使用gcc工具链的编译方法是嵌入式开发的通用方法。但是这里有个特殊的地方-static。 gcc 加上 -***static*,会在链接阶段, 查找对应模块的静态库, 而非动态库, 并把需要的东西,都带进目标文件),编译好后,文件会非常大,但是,运行时就不需要依赖。这个原因则是在OpenHarmony的镜像文件里放的是musl的lib库，没有glibc的lib库，所以如果不用-static标志则有可能在运行时找其他运行库，找不到则运行不成功。

### CLang编译方法

1. **工具链位置：[源码路径]/prebuilts/clang/ohos/linux-x86\_64/llvm/bin**
2. **编译命令：**

* **clang --sysroot=[ohos代码路径]/out/rk3568/obj/third\_party/musl/  --target=arm-linux-ohosmusl -D****clang** -march=armv7-a  -mfloat-abi=softfp -mfpu=neon-vfpv4 -w  -o helloworld.c.o  -c helloworld.c
* **clang --sysroot=[ohos代码路径]/out/rk3568/obj/third\_party/musl/ --target=arm-linux-ohosmusl -D****clang** -march=armv7-a  -mfloat-abi=softfp -mfpu=neon-vfpv4 -w  -Wl,--dynamic-linker,/lib/ld-musl-arm.so.1 -rdynamic helloworld.c.o  -o muslhelloworld
3. **方法解析：**
**clang编译器是APPLE公司的编译器大牛Chris Lattner主导下编写的,其目标是替换大名鼎鼎的GCC编译器。一般编译器的流程如下：**

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**通过上面的命令分析分了两部，第一步编译生成中间文件：helloworld.c.o，也就是从预处理一直到后端的过程；第二步链接helloworld.c.o和/lib/ld-musl-arm.so.1生成目标文件muslhelloworld也就是链接和生成文件。这部分和上部分的区别就是手动引用musl库。那么musl库和glibc的库的区别是什么呢？**

1. **开源版本：glibc（LGPLv2.1），musl(MIT)**
2. **运行速度：glibc优于musl，同时稳定性也是glibc更好**
3. **代码可读性：musl由于glibc**

### 总结

**OpenHarmony的官方编译方法就是使用./build.sh脚本文件，调用顺序大致如下：**

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**所以如果要缩减编译时间还有一些特殊方法：**

* **./build.sh --product-name  【产品名称如：rk3568】--ccache --build-target 【编译对象模块，如：moduleb\_lib】**
  **此方法也是官方的一种编译方法，虽说只编译一个模块，但是流程是完整的，即：**
  * **用BUILD.gn生成ninja文件，然后通过上面的流程编译最总的模块二进制文件**
* **ninja -C /out/rk3568(根据编译的productname来填) moduleb\_lib(编译对象模块，如：moduleb\_lib)**
  **此方法的前提是首先用./build.sh编译过一遍，然后因为out目录里提前生成了build.ninja，所以可以直接用ninja命令直接编译对应模块**
[/md]

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