outdir = rebase_path("$root_out_dir") 中的root_out_dir 环境变量是哪里设置的？

【问题描述】
问题现象和发生的背景
outdir = rebase_path("$root_out_dir") 中的root_out_dir 环境变量是哪里设置的？


相关的代码，截图，日志信息


我尝试过的解决方法和结果


我想要达到的结果


【运行环境】
硬件：
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这个应该是gn内置的变量：

1. ❯ ../prebuilts/build-tools/linux-x86/bin/gn help root_out_dir
   
2. root_out_dir: [string] Root directory for toolchain output files.
   
3. 
   
4.   Absolute path to the root of the output directory tree for the current
   
5.   toolchain. It will not have a trailing slash.
   
6. 
   
7.   For the default toolchain this will be the same as the root_build_dir. An
   
8.   example would be "//out/Debug" for the default toolchain, or
   
9.   "//out/Debug/arm" for the "arm" toolchain.
   
10. 
    
11.   This is primarily useful for setting up script calls. If you are passing this
    
12.   to a script, you will want to pass it through rebase_path() (see "gn help
    
13.   rebase_path") to convert it to be relative to the build directory.
    
14. 
    
15.   See also "target_out_dir" which is usually a better location for output
    
16.   files. It will be inside the root output dir.
    
17. 
    
18. Example
    
19. 
    
20.   action("myscript") {
    
21.     # Pass the output dir to the script.
    
22.     args = [ "-o", rebase_path(root_out_dir, root_build_dir) ]
    
23.   }

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回复 深开鸿_李涛: 很有用十分感谢，命令也实用