v8 build error

[Joe Harrington]

I'm new to building v8 and i'm getting this error when I try build gyp_v8 (using win 10/visual c++ 2015 community):

updating projects from gyp files

python: can't open file '../tools/clang/scripts/update.py' : [Errno 2] no such file or directory

gyp: call to 'python ../tools/clang/scripts/update.py --print-revision' returned exit status 2 while in C:\all.gyp

How do I fix this?

[Jakob Kummerow]

How did you check out V8? Did you follow the instructions at https://github.com/v8/v8/wiki/Using%20Git#how-to-start?

(My guess would be that you simply "git clone"d the main repository. Doing so wouldn't run "gclient sync", so you'd end up missing all third-party dependencies, one of which is tools/clang/* .)

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[Joe Harrington]

Followed the instructions on the page and have yet to get to where it makes the build files. :(

[Jakob Kummerow]

Are you looking for https://github.com/v8/v8/wiki/Building%20with%20Gyp#building-1?

On Mon, Feb 8, 2016 at 10:18 AM, Joe Harrington <jharrin...@gmail.com> wrote:

Followed the instructions on the page and have yet to get to where it makes the build files. :(

[Joe Harrington]

C:\Users\JH\Documents\Libs\depot_tools>python.exe v8\build\gyp_v8 -Dtarget_arch=x64 -Dcomponent=shared_library

Please follow the instructions at http://www.chromium.org/developers/how-tos/build-instructions-windows

Traceback (most recent call last):

  File "v8\build\gyp_v8", line 121, in <module>

    gyp_environment.set_environment()

  File "C:\Users\JH\Documents\Libs\depot_tools\v8\build\gyp_environment.py", line 54, in set_environment

    vs_toolchain.SetEnvironmentAndGetRuntimeDllDirs()

  File "C:\Users\JH\Documents\Libs\depot_tools\v8\build\vs_toolchain.py", line 40, in SetEnvironmentAndGetRuntimeDllDirs

    Update()

  File "C:\Users\JH\Documents\Libs\depot_tools\v8\build\vs_toolchain.py", line 226, in Update

    subprocess.check_call(get_toolchain_args)

  File "C:\Users\JH\Documents\Libs\python_27\lib\subprocess.py", line 540, in check_call

    raise CalledProcessError(retcode, cmd)

subprocess.CalledProcessError: Command '['C:\\Users\\JH\\Documents\\Libs\\python_27\\python.exe', 'C:\\Users\\JH\\Documents\\Libs\\depot_tools\\win_toolchain\\get_toolchain_if_necessary.py', '--output-json', 'C:\\Users\\JH\\Documents\\Libs\\depot_tools\\v8\\build\\win_toolchain.json', '5a85cf1ce842f7cc96b9d17039a445a9dc9cf0dd']' returned non-zero exit status 1

C:\Users\Joe Harrington\Documents\Libs\depot_tools>

Restarted. Again followed the directions. Again fail. No matter what I do I get errors. :(

[Jakob Kummerow]

On Mon, Feb 8, 2016 at 3:23 PM, Joe Harrington <jharrin...@gmail.com> wrote:

C:\Users\JH\Documents\Libs\depot_tools>python.exe v8\build\gyp_v8 -Dtarget_arch=x64 -Dcomponent=shared_library

Please follow the instructions at http://www.chromium.org/developers/how-tos/build-instructions-windows

That link ^ tells you to "Run set DEPOT_TOOLS_WIN_TOOLCHAIN=0, or set that variable in your global environment." Does that help?

Traceback (most recent call last):

  File "v8\build\gyp_v8", line 121, in <module>

    gyp_environment.set_environment()

  File "C:\Users\JH\Documents\Libs\depot_tools\v8\build\gyp_environment.py", line 54, in set_environment

    vs_toolchain.SetEnvironmentAndGetRuntimeDllDirs()

  File "C:\Users\JH\Documents\Libs\depot_tools\v8\build\vs_toolchain.py", line 40, in SetEnvironmentAndGetRuntimeDllDirs

    Update()

  File "C:\Users\JH\Documents\Libs\depot_tools\v8\build\vs_toolchain.py", line 226, in Update

    subprocess.check_call(get_toolchain_args)

  File "C:\Users\JH\Documents\Libs\python_27\lib\subprocess.py", line 540, in check_call

    raise CalledProcessError(retcode, cmd)

subprocess.CalledProcessError: Command '['C:\\Users\\JH\\Documents\\Libs\\python_27\\python.exe', 'C:\\Users\\JH\\Documents\\Libs\\depot_tools\\win_toolchain\\get_toolchain_if_necessary.py', '--output-json', 'C:\\Users\\JH\\Documents\\Libs\\depot_tools\\v8\\build\\win_toolchain.json', '5a85cf1ce842f7cc96b9d17039a445a9dc9cf0dd']' returned non-zero exit status 1

C:\Users\Joe Harrington\Documents\Libs\depot_tools>

Restarted. Again followed the directions. Again fail. No matter what I do I get errors. :(

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[Joe Harrington]

No.

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[Joe Harrington]

No.

[Jakob Kummerow]

Well, please double-check for typos. If you look around

  File "C:\Users\JH\Documents\Libs\depot_tools\v8\build\vs_toolchain.py", line 40, in SetEnvironmentAndGetRuntimeDllDirs

you'll see that a few lines before it checks for that environment variable, and won't proceed to the code that later fails for you if that variable is set to 0. I don't see why that mechanism wouldn't be working. (Whereas get_toolchain_if_necessary.py can't possibly work for you; so DEPOT_TOOLS_WIN_TOOLCHAIN=0 should ensure that it's never even executed.)

[Joe Harrington]

Installed to root of drive, reset all environment paths, and all problems went away. I think it was having problem with long pathname. :/