How to build a fixed version of V8 and its dependencies.

[Edd Barrett]

Hi,

I raised this as a bug, but was asked to re-post here.

For a benchmarking experiment I need to build a frozen version of V8. For most VMs this means just checking out a specific git version of the code and building it. For V8 it is complicated by the depot_tools system. I've yet to find a reliable way to do this.

In the past, I've gotten by with cloning a specific version of depot tools, fetching V8, then walking the dependencies resetting the git versions of everything to a fixed date (this hack is needed because `fetch` gets moving targets). When this stopped working (it was a hack anyway), I resorted to rolling my own tarballs, which is not really ideal either.

Is there an official way to build an frozen version of V8? How do you guys build (e.g.) V8-5.8.283.32 and using the dependencies of the time of that release?

Without the ability to do this, it's difficult to conduct repeatable benchmarking experiments on V8.

Thanks

[Mathias Bynens]

This is not a direct answer to your question, but we already host prebuilt `d8` binaries for Linux on 32-bit and 64-bit architectures. We plan on doing the same for other operating systems: https://bugs.chromium.org/p/v8/issues/detail?id=5918 By using a precompiled binary, you could bypass compiling from source together.

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[Edd Barrett]

Hi Mathias,

Thanks for your swift response.

On Monday, November 27, 2017 at 1:40:05 PM UTC, Mathias Bynens wrote:

This is not a direct answer to your question, but we already host prebuilt `d8` binaries for Linux on 32-bit and 64-bit architectures. We plan on doing the same for other operating systems: https://bugs.chromium.org/p/v8/issues/detail?id=5918 By using a precompiled binary, you could bypass compiling from source together.

 

That's good to know, but for our purposes we really do need to build from source:

 * We have patches to grant access to the monotonic clock and performance counters.

 * The experiment should be fully repeatable from source.

I think it's something the V8 team should consider for the future.

Cheers

[Jakob Kummerow]

The depot_tools system makes this easy, actually:

git checkout <your-version>

gclient sync

ninja -C out/<whatever> d8

(If you go back far enough before ninja was supported, replace the last command with the equivalent make/GYP based build.)

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[Edd Barrett]

On Monday, November 27, 2017 at 7:06:47 PM UTC, Jakob Kummerow wrote:

The depot_tools system makes this easy, actually:

git checkout <your-version>

gclient sync

ninja -C out/<whatever> d8

(If you go back far enough before ninja was supported, replace the last command with the equivalent make/GYP based build.)

Thanks. I confirm that this works :)