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+# cmake 工具交叉编译说明
+
+## 简介
+CMake是一个跨平台的编译安装工具。
+
+## 编译步骤
+
+### 编译工具链下载
+
+- 64位编译工具：gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu.tar  [下载链接](https://releases.linaro.org/components/toolchain/binaries/7.5-2019.12/aarch64-linux-gnu/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu.tar.xz)
+
+- 32位编译工具：gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabi.tar [下载链接](https://releases.linaro.org/components/toolchain/binaries/7.5-2019.12/arm-linux-gnueabi/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabi.tar.xz)
+
+### 解压编译工具链
+
+- 解压64位 tar -xvf gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu.tar
+- 解压32位 tar -xvf gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabi.tar
+
+- 进入解压后的文件夹，查看bin目录下就有我们编译用到的工具链
+
+### 下载解压cmake源码
+
+- 下载最新版本的cmake源码,[下载链接](https://cmake.org/download/) (以3.27-rc2为例)
+- 通过tar命令解压源码 tar -xzvf cmake-3.27.0-rc2.tar.gz
+
+### 创建编译目录
+
+- 进入源码解压后目录  cd cmake-3.27.0-rc2
+- 创建64位编译目录  mkdir arm64_build 
+- 创建32位编译目录 mkdir arm32_build 
+
+### 设置交叉编译环境
+
+- 设置64位交叉编译环境, xxx 是表示工具链存放的目录路径
+
+
+```shell
+export TOOLS=/xxx/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin
+export AS=${TOOLS}/aarch64-linux-gnu-as
+export CC=${TOOLS}/aarch64-linux-gnu-gcc
+export CXX=${TOOLS}/aarch64-linux-gnu-g++
+export LD=${TOOLS}/aarch64-linux-gnu-ld
+export STRIP=${TOOLS}/aarch64-linux-gnu-strip
+export RANLIB=${TOOLS}/aarch64-linux-gnu-ranlib
+export OBJDUMP=${TOOLS}/aarch64-linux-gnu-objdump
+export OBJCOPY=${TOOLS}/aarch64-linux-gnu-objcopy
+export NM=${TOOLS}/aarch64-linux-gnu-gcc-nm
+export AR=${TOOLS}/aarch64-linux-gnu-ar
+export LDFLAGS="-static"
+```
+
+- 设置32位交叉编译环境, xxx 是表示工具链存放的目录路径
+
+```shell
+
+export TOOLS=/xxx/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabi/bin
+export AS=${TOOLS}/arm-linux-gnueabi-as
+export CC=${TOOLS}/arm-linux-gnueabi-gcc
+export CXX=${TOOLS}/arm-linux-gnueabi-g++
+export LD=${TOOLS}/arm-linux-gnueabi-ld
+export STRIP=${TOOLS}/arm-linux-gnueabi-strip
+export RANLIB=${TOOLS}/arm-linux-gnueabi-ranlib
+export OBJDUMP=${TOOLS}/arm-linux-gnueabi-objdump
+export OBJCOPY=${TOOLS}/arm-linux-gnueabi-objcopy
+export NM=${TOOLS}/arm-linux-gnueabi-gcc-nm
+export AR=${TOOLS}/arm-linux-gnueabi-ar
+export LDFLAGS="-static"
+```
+
+### 生成makefile
+
+- 进入64位编译路径 cd  arm64_build
+- 执行如下命令生成makefile
+
+```shell
+cmake  ../  -L   -DCMAKE_USE_OPENSSL=OFF 
+```
+
+-  进入32位为 cd arm32_build ，由于编译测试是有一个动态库依赖，故关闭变成测试用例开关
+- 执行如下命令生成makefile
+
+```shell
+cmake  ../  -L    -DCMAKE_USE_OPENSSL=OFF -DBUILD_TESTING=OFF
+```
+
+### 编译cmake源码
+
+在对应的编译目录执行 make  VERBOSE=1,编译成功截图如下，以64位为例
+
+ ![make_file](media/make_success.png)
+
+### 编译完成
+
+查看编译生成的文件ls bin/, 编译出来cmake ctest 就可以，并可通过file cmake 看到文件属性，必须是静态链接，不然OHOS系统会因为找不到动态链接库而报错
+
+ ![32_file](media/32_file.png)
+
+ ![64_file](media/64_file.png)
+
+### 安装cmake
+
+由于交叉编译不能make install安装cmake，故只能通过make install X86系统的cmake，这一步操作是为了解决在OHOS系统上执行cmake命令有提示报错的问题
+
+ ![error](media/error.png)
+
+- 重新开一个窗口，进入cmake源码目录 
+
+- 创建一个host目录
+
+```shell
+mkdir host
+```
+
+- 进入host目录，执行 cmake生成makefile，命令如下
+
+```shell
+cmake  ../  -L   -DCMAKE_USE_OPENSSL=OFF -DCMAKE_INSTALL_PREFIX="${PWD}/install" 
+```
+
+- 执行make install  进行编译安装，完成后可以看到Modules目录下的文件
+
+![insatll_file](media/install.png)
+
+- 将./install/share/cmake-3.27/Modules/ 拷贝到交叉编译目录下
+
+```shell
+#重新进入交叉编译目录，新建share/cmake-3.27/目录
+cd ../arm64_build
+mkdir -p share/cmake-3.27/
+cp ../host/install/share/cmake-3.27/Modules/ ./share/cmake-3.27/ -rf
+```
+
+### OHOS系统上运行
+
+将编译目录文件压缩打包，发送到OHOS开发板中，进入bin路径，执行./ctest -version，截图如下
+
+```shell
+#打包64编译目录
+tar -zcvf arm64_build.tar.gz arm64_build/
+#发送到OHOS系统开发板上
+hdc file send xxx\arm64_build.tar.gz /data   
+#进入开发板/data，解压arm64_build.tar.gz
+hdc shell
+cd /data
+tar -zxvf arm64_build.tar.gz
+```
+
+进入arm64_build/bin目录，执行./cmake -version 和 ./ctest -version 效果如下截图
+
+ ![run_file](media/run.png)
+
+
+
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