Unable to setup V8 build locally (//build/dotfile_settings.gni)

[Alice Kile]

Hello,

I'm new to V8 and just trying to setup the project locally so I can=20
officially start trying to understand / read through some of the code!=20
Unfortunately I am currently stuck at a problem, I am following the=20
instructions from page below:

https://v8.dev/docs/build#building-v8

The command that is failing for me is step 3: tools/dev/gm.py x64.release

Here's the error output I am getting from running that command:

$ v8 git:(8a2d9bdb0c7) gm x64.release
# gn gen out/x64.release
ERROR at //.gn:5:1: Unable to load=20
"/~/chromium-project/src/v8/build/dotfile_settings.gni".
import("//build/dotfile_settings.gni")

Just googling around, I was able to figure out that this is likely=20
because gclient did not clone the v8/build folder all together, and it=20
does look like it but after having run gclient sync or gclient sync=20
--force, I don't see any changes so I am clueless right now as to what=20
the next course of action should be.

Any help would be highly appreciated!

Alice 

[Ben Ernst]

What OS are you on, and what version of v8 are you trying to build?

Have you tried just blowing away your working directory and starting again from scratch?

Ben

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[Camillo Bruni]

Just a hunch, looks like you're trying to build V8 from within a chromium checkout.

Have you run the fetch instructions for a separate checkout of V8?

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Camillo Bruni |

Software Engineer, V8 |

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[Alice Kile]

Hello, yup I actually ran the fetch instructions from the page you have linked to! And Indeed, I am fetching v8 inside an already checked out chromium folder (I checked out by using --no-history to save time)

I am running MacOS 13.4

[Alice Kile]

Just an update to this, I've tried the advice of just "blowing away" the whole folder. I deleted the entire chromium-project folder and only fetched v8. This step has worked for me and now I am able to build everything fine! Although my original goal to clone both chromium and v8 is still not achieved, so maybe I will try that in a different folder.

[Alice Kile]

Hello,

I'm new to V8 and just trying to setup the project locally so I can=20
officially start trying to understand / read through some of the code!=20
Unfortunately I am currently stuck at a problem, I am following the=20
instructions from page below:

https://v8.dev/docs/build#building-v8

The command that is failing for me is step 3: tools/dev/gm.py x64.release

Here's the error output I am getting from running that command:

=E2=9E=9C=C2=A0 v8 git:(8a2d9bdb0c7) gm x64.release

# gn gen out/x64.release
ERROR at //.gn:5:1: Unable to load=20
"/~/chromium-project/src/v8/build/dotfile_settings.gni".
import("//build/dotfile_settings.gni")

Just googling around, I was able to figure out that this is likely=20
because gclient did not clone the v8/build folder all together, and it=20
does look like it but after having run gclient sync or gclient sync=20
--force, I don't see any changes so I am clueless right now as to what=20
the next course of action should be.

Any help would be highly appreciated! =F0=9F=98=87

Alice

[Camillo Bruni]

For using the same checkout in chromium and standalone I suggest using git worktree [1].

Building inside the v8 folder from within a chromium checkout doesn't work directly, however you can build the same V8 targets from the chromium src folder if that helps.

[1] https://git-scm.com/docs/git-worktree

To view this discussion on the web visit https://groups.google.com/d/msgid/v8-users/3f7fd2eb-6ca3-47c4-b283-b4833468f658n%40googlegroups.com.

[Camillo Bruni]

Did you use "fetch v8" as exlpained on https://v8.dev/docs/source-code ?

On Mon, 18 Dec 2023 at 13:04, eric vergnaud <ad...@prompto.cloud> wrote:

Hi,

I'm facing the exact same issue.

I am string to build v8 as a standalone project.

I have cloned depot_tools and run gclient successfully

I have cloned v8 separately and run git pull && gclient sync successfully

No 'build' directory has been created

When I run tools/dev/gm.py x64.release, I get ERROR at //.gn:5:1: Unable to load ".../v8/build/dotfile_settings.gni" (erased the root for clarity).

Are the instructions at https://v8.dev/docs/build missing a step ? Or am I misreading them ?

To view this discussion on the web visit https://groups.google.com/d/msgid/v8-users/26c66340-e4cb-4baf-af1b-421ab373f514n%40googlegroups.com.