Checking out and Building Chromium for Windows

[Conor Gorman]

Hi all, I'm trying to set up the chromium build but keep getting the same error when I try.
I've attached a screenshot also. ( It's when i try the line 'gn gen out/Default')

Any ideas?

Cheers.

[Nico Weber]

The first error message says that it can't find VS2015. Do you have Visual Studio 2015 installed?

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[Conor Gorman]

I've got VS 2017 installed, I assumed the more recent version would not cause any errors.

[Nico Weber]

Building with 2017 isn't supported yet. https://chromium.googlesource.com/chromium/src/+/master/docs/windows_build_instructions.md has the build instructions, it's pretty explicit about that.

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[Conor Gorman]

Hey, still getting the same error for the 'gn gen out\Default' command.

[Nico Weber]

Did you run `gclient sync` again? The error was during syncing, and gn errors out because the sync didn't complete.

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[Conor Gorman]

I did yes, and it looked like it ran through successfully. 
Same error. Killing me here. 

[Conor Gorman]

There is a separate error now, I will post another screenshot.

[Nico Weber]

What's the output of `where python`? What's the output of `echo %PATH%`? Note that the build instructions say that depot_tools must be at the front of your %PATH%. (It contains a python binary that's known to work with the build.)

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[Conor Gorman]

[Nico Weber]

First: https://www.howtogeek.com/howto/windows-vista/copy-to-the-clipboard-from-the-windows-command-prompt/

That looks correct. What's the output of `git status`? `where gn`?

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[Conor Gorman]

where gn..

F:\>where gn

F:\Desktop\depot_tools\gn

F:\Desktop\depot_tools\gn.bat

F:\Desktop\depot_tools\gn.py

git status was quite long ill post the end if you need more i can update.

Unmerged paths:

  (use "git reset HEAD <file>..." to unstage)

  (use "git add <file>..." to mark resolution)

        both added:      .gitignore

        both added:      LICENSE

        both added:      OWNERS

        both added:      PRESUBMIT.py

        both added:      WATCHLISTS

        both added:      codereview.settings

        both added:      infra/README.md

        both added:      infra/config/OWNERS

        both added:      infra/config/cq.cfg

        both added:      third_party/colorama/README.chromium

        both added:      third_party/logilab/README.chromium

        both added:      third_party/pylint/README.chromium

        both added:      third_party/simplejson/__init__.py

        both added:      third_party/simplejson/decoder.py

        both added:      third_party/simplejson/encoder.py

It took 3.71 seconds to enumerate untracked files. 'status -uno'

may speed it up, but you have to be careful not to forget to add

new files yourself (see 'git help status').

[Nico Weber]

Looks like your git checkout is in a bad state for some reason. If `git branch` doesn't say `* master`, run `git rebase --abort` and `git checkout -f master`. Then run `git reset --hard origin/master` (independent of the output of `git branch` in the last sentence). If that doesn't help, run `git clean -f -d` followed by `gclient sync` again and try again.

If things still don't work, paste the output of `type ..\.gclient`.

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[Conor Gorman]

F:\Desktop\chromium2\src>type ..\.gclient

solutions = [

  {

    "url": "https://chromium.googlesource.com/chromium/src.git",

    "managed": False,

    "name": "src",

    "deps_file": ".DEPS.git",

    "custom_deps": {},

  },

]

[Conor Gorman]

also 

F:\Desktop\chromium2\src>gn gen out/Default

ERROR Can't find source root.

I could not find a ".gn" file in the current directory or any parent,

and the --root command-line argument was not specified.

if that helps in any way.

On Thursday, March 16, 2017 at 4:43:09 PM UTC, Conor Gorman wrote:

[Nico Weber]

What was the output of all the git commands?

Your checkout sounds super busted if there's no .gn file. Try following the
checkout and build instructions letter by letter anew.

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[Conor Gorman]

Hi Nico,
I've left the workstation where I was operating from, but you're helping a lot and I wondered if it would be ok to pickup tomorrow morning (GMT) where we left off? I should have the git command responses and I can do another fresh checkout if need be?

Thanks very much for your help this far.

[Bruce]

Regarding VS 2017, it is possible to build with VS 2017, I've been doing that for a few days, but it is unsupported and untested and could break at any moment.

The tracking bug is crbug.com/683729. You need:

set DEPOT_TOOLS_WIN_TOOLCHAIN=0

set GYP_MSVS_VERSION=2017

And, because there is still one unresolved warning you will need this in your args.gn:

treat_warnings_as_errors = false

If you try this and hit any VS 2017 specific problems then I can try to help resolve them, but because it's unsupported there are no guarantees.

[Conor Gorman]

So I've redone a Checkout and may have ran into another error.

F:\Desktop\chromium>fetch --no-history chromium

Running: 'F:\Desktop\depot_tools\python276_bin\python.exe' 'F:\Desktop\depot_too

ls\gclient.py' root

Running: 'F:\Desktop\depot_tools\python276_bin\python.exe' 'F:\Desktop\depot_too

ls\gclient.py' config --spec 'solutions = [

  {

    "url": "https://chromium.googlesource.com/chromium/src.git",

    "managed": False,

    "name": "src",

    "deps_file": ".DEPS.git",

    "custom_deps": {},

  },

]

'

Running: 'F:\Desktop\depot_tools\python276_bin\python.exe' 'F:\Desktop\depot_too

ls\gclient.py' sync --no-history

Running: 'F:\Desktop\depot_tools\git.bat' submodule foreach 'git config -f $topl

evel/.git/config submodule.$name.ignore all'

Running: 'F:\Desktop\depot_tools\git.bat' config --add remote.origin.fetch '+ref

s/tags/*:refs/tags/*'

Running: 'F:\Desktop\depot_tools\git.bat' config diff.ignoreSubmodules all

F:\Desktop\chromium>cd src

F:\Desktop\chromium\src>gn gen out/Default

Traceback (most recent call last):

  File "F:/Desktop/chromium/src/build/vs_toolchain.py", line 457, in <module>

    sys.exit(main())

  File "F:/Desktop/chromium/src/build/vs_toolchain.py", line 453, in main

    return commands[sys.argv[1]](*sys.argv[2:])

  File "F:/Desktop/chromium/src/build/vs_toolchain.py", line 323, in CopyDlls

    _CopyDebugger(target_dir, target_cpu)

  File "F:/Desktop/chromium/src/build/vs_toolchain.py", line 343, in _CopyDebugg

er

    _CopyRuntimeImpl(target_path, full_path)

  File "F:/Desktop/chromium/src/build/vs_toolchain.py", line 200, in _CopyRuntim

eImpl

    shutil.copy2(source, target)

  File "F:\Desktop\depot_tools\python276_bin\lib\shutil.py", line 130, in copy2

    copyfile(src, dst)

  File "F:\Desktop\depot_tools\python276_bin\lib\shutil.py", line 82, in copyfil

e

    with open(src, 'rb') as fsrc:

IOError: [Errno 2] No such file or directory: 'C:\\Program Files (x86)\\Windows

Kits\\10\\Debuggers\\x64\\cdb.exe'

ERROR at //build/toolchain/win/BUILD.gn:39:3: Script returned non-zero exit code

.

  exec_script("../../vs_toolchain.py",

  ^----------

Current dir: F:/Desktop/chromium/src/out/Default/

Command: F:/Desktop/depot_tools/python276_bin/python.exe -- F:/Desktop/chromium/

src/build/vs_toolchain.py copy_dlls F:/Desktop/chromium/src/out/Default Debug x6

4

Returned 1 and printed out:

Copying C:\Windows\Sysnative\msvcp140.dll to F:/Desktop/chromium/src/out/Default

\msvcp140.dll...

Copying C:\Windows\Sysnative\vccorlib140.dll to F:/Desktop/chromium/src/out/Defa

ult\vccorlib140.dll...

Copying C:\Windows\Sysnative\vcruntime140.dll to F:/Desktop/chromium/src/out/Def

ault\vcruntime140.dll...

Copying C:\Windows\Sysnative\ucrtbase.dll to F:/Desktop/chromium/src/out/Default

\ucrtbase.dll...

Copying C:\Windows\Sysnative\msvcp140d.dll to F:/Desktop/chromium/src/out/Defaul

t\msvcp140d.dll...

Copying C:\Windows\Sysnative\vccorlib140d.dll to F:/Desktop/chromium/src/out/Def

ault\vccorlib140d.dll...

Copying C:\Windows\Sysnative\vcruntime140d.dll to F:/Desktop/chromium/src/out/De

fault\vcruntime140d.dll...

Copying C:\Windows\Sysnative\ucrtbased.dll to F:/Desktop/chromium/src/out/Defaul

t\ucrtbased.dll...

Copying C:\Program Files (x86)\Windows Kits\10\Debuggers\x64\cdb.exe to F:/Deskt

op/chromium/src/out/Default\cdb.exe...

See //BUILD.gn:73:1: which caused the file to be included.

group("gn_all") {

^----------------

[Nico Weber]

Hm, the code that copies cdb is relatively new, in https://codereview.chromium.org/2684033010 I guess cdb doesn't get installed by default, we should probably make the script work if it's not there.

In the meantime, things will probably work if you get the debugging kit from https://developer.microsoft.com/en-us/windows/hardware/windows-driver-kit (look for the "If you just need the Debugging Tools for Windows 10, and not WDK 10 or Visual Studio 2015, you can install the debugging tools as a standalone component from Windows SDK. In the installation wizard, select Debugging Tools for Windows, and deselect all other components." paragraph and click the "Get Debugging Tools for Windows (WinDbg) (from the SDK)" link below it.)

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[Conor Gorman]

After running the .exe I tried again.

F:\Desktop\chromium\src>gn gen out/Default

Traceback (most recent call last):

  File "F:/Desktop/chromium/src/build/toolchain/win/setup_toolchain.py", line 21

4, in <module>

    main()

  File "F:/Desktop/chromium/src/build/toolchain/win/setup_toolchain.py", line 17

9, in main

    env = _LoadToolchainEnv(cpu, win_sdk_path)

  File "F:/Desktop/chromium/src/build/toolchain/win/setup_toolchain.py", line 14

0, in _LoadToolchainEnv

    script_path)

Exception: C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat

is missing - make sure VC++ tools are installed.

ERROR at //build/toolchain/win/BUILD.gn:366:22: Script returned non-zero exit co

de.

x64_toolchain_data = exec_script("setup_toolchain.py",

                     ^----------

Current dir: F:/Desktop/chromium/src/out/Default/

Command: F:/Desktop/depot_tools/python276_bin/python.exe -- F:/Desktop/chromium/

src/build/toolchain/win/setup_toolchain.py "C:\Program Files (x86)\Microsoft Vis

ual Studio 14.0" "C:\Program Files (x86)\Windows Kits\10" "C:\Windows\Sysnative;

C:\Windows\SysWOW64" x64

Returned 1.

[Nico Weber]

It says:

Exception: C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat

is missing - make sure VC++ tools are installed.

Does that file exist on your system? Does c:\program files (x86)\microsoft visual studio 14.0 exist?

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[Conor Gorman]

All the way to VC exists, but there is no vcvarsall.bat file in the VC folder.

[Nico Weber]

Hm, I don't know under which conditions the VS installer installs that bat file. Maybe following the steps in https://social.msdn.microsoft.com/Forums/en-US/1071be0e-2a46-4c30-9546-ea9d7c4755fa/where-is-vcvarsallbat-file?forum=visualstudiogeneral helps, but I don't know. Maybe you deselected too many options during install, or the Community installer doesn't install that bat file.

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[Conor Gorman]

I think we've broken ground.

F:\Desktop\chromium\src>gn gen out/Default

Done. Made 5417 targets from 1258 files in 18007ms

[Bruce Dawson]

It is unfortunate that VS 2015 defaults (IIRC) to not installing the C++ compiler. This is a break from previous tradition so it catches many people unaware.

The debugger toolkit is also not installed by default. These are both easily corrected but given that they are moderately common mistakes we should probably specifically detect them and print specific guidance, instead of the generic "file not found" error.

I just filed crbug.com/702697 for this.

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[Conor Gorman]

The error is vague but it does say in the online instructions what to do. The instructions have been pretty descriptive, apart from the git issue, but that may have been an issue special to my situation.

Thanks for the help. 

On Friday, March 17, 2017 at 5:55:53 PM UTC, Bruce Dawson wrote:

It is unfortunate that VS 2015 defaults (IIRC) to not installing the C++ compiler. This is a break from previous tradition so it catches many people unaware.

The debugger toolkit is also not installed by default. These are both easily corrected but given that they are moderately common mistakes we should probably specifically detect them and print specific guidance, instead of the generic "file not found" error.

I just filed crbug.com/702697 for this.

On Fri, Mar 17, 2017 at 9:54 AM, Conor Gorman <conor...@gmail.com> wrote:

I think we've broken ground.

F:\Desktop\chromium\src>gn gen out/Default

Done. Made 5417 targets from 1258 files in 18007ms

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