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一个构建工具，它的作用和make命令是一样的。
#### ninja文件介绍
```
# 规则(rule)
rule <rule_name>
command = gcc ...
description =
# build语句
build <target_name> : <rule_name> <inputs>
# subninja和include，都是用来引入其它的ninja文件。不同点是，subninja引入的子模块可以使用父模块的变量，include引入的子模块不可以使用交模块中的变量。