Run into same error. Steps followed to correct:
1. Delete depot_tools
2. Environment variables:
set DEPOT_TOOLS_WIN_TOOLCHAIN=0
set DEPOT_TOOLS_UPDATE=0
3. Install depot_tools again and follow to 'fetch v8'

On Tuesday, August 14, 2018 at 1:06:48 PM UTC-7, dan Med wrote:

> it is really frustrating
>
>
> 2018-08-14 22:06 GMT+02:00 dan Med <[email protected] <javascript:>>:
>
>> OK so after the fetch v8 command this happened 
>> subprocess.CalledProcessError: Command 
>> '('C:\\depot_tools\\win_tools-2_7_6_bin\\python\\bin\\python.exe', 
>> 'C:\\depot_tools\\gclient.py', 'sync', '--with_branch_heads')' returned 
>> non-zero exit status 2
>>
>> 2018-08-14 18:49 GMT+02:00 dan Med <[email protected] <javascript:>>:
>>
>>> yeah but stil 1 that isn't the page for windows
>>> second after fetch i will get one error for sure now i will try again
>>>
>>> 2018-08-14 18:26 GMT+02:00 'Leszek Swirski' via v8-dev <
>>> [email protected] <javascript:>>:
>>>
>>>> Try it again, make sure you go through all the gclient steps (calling 
>>>> gclient before fetch, calling gclient sync after fetch), follow the 
>>>> remaining steps on that page and see what happens.
>>>>
>>>> On Tue, Aug 14, 2018 at 5:24 PM dan Med <[email protected] 
>>>> <javascript:>> wrote:
>>>>
>>>>> Yeah ! ok so what i have so far is the depot tools already set up and 
>>>>> i already have git on my computer.
>>>>> Before going with your path, i should say that yesterday i gave it a 
>>>>> shot and after the fetch v8 command run for a while it asked mefor a 
>>>>> username input for a google.something email i've already cleared 
>>>>> everything 
>>>>> up because i thought i should start from zero and here u are so.
>>>>> I will do fetch v8 now ? 
>>>>>
>>>>> 2018-08-14 18:21 GMT+02:00 'Leszek Swirski' via v8-dev <
>>>>> [email protected] <javascript:>>:
>>>>>
>>>>>> The parts about depot tools and "Don’t simply git clone the V8 
>>>>>> repository!" are still relevant.
>>>>>>
>>>>>> Windows builds are admittedly less well documented than Linux/Mac 
>>>>>> builds, we should clarify the docs there.
>>>>>>
>>>>>> On Tue, Aug 14, 2018 at 5:19 PM dan Med <[email protected] 
>>>>>> <javascript:>> wrote:
>>>>>>
>>>>>>> but isn't the link u just gave to me wrong ???  cause at the top i 
>>>>>>> read  
>>>>>>>
>>>>>>> In order to be able to build V8 from scratch *on Linux/Mac for x64* 
>>>>>>> please 
>>>>>>> heed the following steps:
>>>>>>>
>>>>>>> but i'm on a windows 
>>>>>>>
>>>>>>> <https://github.com/v8/v8/wiki/Building-from-Source#getting-the-v8-source-tldr>
>>>>>>>
>>>>>>> 2018-08-14 18:16 GMT+02:00 'Leszek Swirski' via v8-dev <
>>>>>>> [email protected] <javascript:>>:
>>>>>>>
>>>>>>>> Did you follow https://github.com/v8/v8/wiki/Building-from-Source 
>>>>>>>> and use depot-tools + "fetch v8"?
>>>>>>>> If yes, then please post what your actual error message is
>>>>>>>> else, do that first.
>>>>>>>>
>>>>>>>> On Tue, Aug 14, 2018 at 5:15 PM dan Med <[email protected] 
>>>>>>>> <javascript:>> wrote:
>>>>>>>>
>>>>>>>>> I'm on a windows based machine, would this be good ? 
>>>>>>>>> https://github.com/v8/v8/wiki/Building-with-GN
>>>>>>>>> if yes
>>>>>>>>>         i already tried it but with no success
>>>>>>>>> else
>>>>>>>>>         i don't know what to  do 
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> 2018-08-14 17:16 GMT+02:00 dan Med <[email protected] 
>>>>>>>>> <javascript:>>:
>>>>>>>>>
>>>>>>>>>> but i'm trying to build it on windows not linux nor OSx
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> 2018-08-14 16:54 GMT+02:00 dan Med <[email protected] 
>>>>>>>>>> <javascript:>>:
>>>>>>>>>>
>>>>>>>>>>> I’m going to try and build it.... and will contact you thank you 
>>>>>>>>>>>
>>>>>>>>>>> On Tue, 14 Aug 2018 at 15:39, 'Leszek Swirski' via v8-dev <
>>>>>>>>>>> [email protected] <javascript:>> wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Can you be more specific about the errors you're getting? 
>>>>>>>>>>>> https://github.com/v8/v8/wiki/Building-from-Source is the 
>>>>>>>>>>>> source of truth here, if there are any issues with this 
>>>>>>>>>>>> documentation 
>>>>>>>>>>>> please let us know because we do want it to be as easy as possible.
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> On Tue, Aug 14, 2018 at 1:59 PM <[email protected] 
>>>>>>>>>>>> <javascript:>> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>> Hi for a long time now i've been trying to build v8 without 
>>>>>>>>>>>>> any success the documentation is vague and i really need to build 
>>>>>>>>>>>>> it along 
>>>>>>>>>>>>> all of it's parts...
>>>>>>>>>>>>> Thank you 
>>>>>>>>>>>>>
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>>>>>
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>>>
>>
>

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