Do not use a different GCC when compiling the kernel image and the user space tools because it can result in a system lock up.

编译内核映像和用户空间工具时不要使用不同的gcc，因为这可能会造成系统的锁定。

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Compiling packages can require a lot of disk space which will be reclaimed after the package is installed.

编译软件包的时候需要很多的硬盘空间，这些可以在软件包安装成功后回收再利用。

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During the compiling, it is of importance to have code optimization reduce the operating time and loading space of target code.

编译过程中，代码优化能减少目标代码的运行时间和存储空间，具有重要作用。

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