I'm passing the simplest CMD command : gn args out.gn/foo




*E:\v8_chrome\v8>gn args out.gn/fooWaiting for editor on 
"E:\v8_chrome\v8\out.gn\foo\args.gn"...Generating files...Traceback (most 
recent call last):  File "E:/v8_chrome/v8/build/vs_toolchain.py", line 404, 
in <module>    sys.exit(main())  File 
"E:/v8_chrome/v8/build/vs_toolchain.py", line 400, in main    return 
commands[sys.argv[1]](*sys.argv[2:])  File 
"E:/v8_chrome/v8/build/vs_toolchain.py", line 370, in GetToolchainDir    
runtime_dll_dirs = SetEnvironmentAndGetRuntimeDllDirs()  File 
"E:/v8_chrome/v8/build/vs_toolchain.py", line 78, in 
SetEnvironmentAndGetRuntimeDllDirs    os.environ['GYP_MSVS_OVERRIDE_PATH'] 
= DetectVisualStudioPath()  File "E:/v8_chrome/v8/build/vs_toolchain.py", 
line 154, in DetectVisualStudioPath    ' not found.') % 
(version_as_year))Exception: Visual Studio Version 2015 (from 
GYP_MSVS_VERSION) not found.ERROR at 
//build/config/win/visual_studio_version.gni:27:7: Script returned non-zero 
exit code.      exec_script("../../vs_toolchain.py", [ "get_toolchain_dir" 
], "scope")      ^----------Current dir: 
E:/v8_chrome/v8/out.gn/foo/Command: 
E:/v8_chrome/depot_tools/python276_bin/python.exe -- 
E:/v8_chrome/v8/build/vs_toolchain.py get_toolchain_dirReturned 1.See 
//build/toolchain/win/BUILD.gn:8:1: whence it was 
imported.import("//build/config/win/visual_studio_version.gni")^----------------------------------------------------See
 
//BUILD.gn:392:1: which caused the file to be included.action("js2c") 
{^---------------What is the problem? I'm really struggling through this 
process.*

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