On Tuesday, 28 January 2020 11:14:12 UTC, Thomas Preston wrote: > > > > On Tuesday, 7 January 2020 14:21:25 UTC, Jakob Gruber wrote: >> >> >> >> On Tue, Jan 7, 2020 at 3:13 PM Thomas Preston <thomas...@codethink.co.uk> >> wrote: >> >>> On Tuesday, 7 January 2020 09:14:36 UTC, Jakob Gruber wrote: >>>> >>>> On Mon, Jan 6, 2020 at 6:30 PM Thomas Preston < >>>> thomas...@codethink.co.uk> wrote: >>>> >>>>> Hi, >>>>> We have noticed that the latest version of Chromium makes the v8 >>>>> snapshot build mandatory. >>>>> We were turning this off for building under Buildroot (for linux, >>>>> targetting 32-bit ARM), because Buildroot has no concept of multilib, and >>>>> host packages can't be installed with 32-bit memory architectures. >>>>> Is there any way to continue to disable v8 snapshot building? If not, >>>>> where can we find out more about building ARM 32-bit V8 snapshots on x64 >>>>> hosts? >>>>> >>>> >>>> Unfortunately there's currently no easy way to do this. A 64-bit >>>> mksnapshot binary (currently) cannot create 32-bit snapshots. >>>> >>>> Your best bet is to build snapshot_blob.bin and embedded.S elsewhere >>>> (e.g. on the host system or in a VM). The final build could then use these >>>> generated files and skip the mksnapshot step. Would that be an option for >>>> you? >>>> >>>> See also the Known Issues section here >>>> <https://docs.google.com/document/d/1Irnq29OIGWMkcsXmazECZii95eIGQoyrYsmriHvpk-M/edit#heading=h.k26jzph28qte> >>>> . >>>> >>>> >>> That's useful, thanks. It looks like checking-in pre-built 32-bit >>> artifacts is the way to go. >>> >>> Is it possible to just run mksnapshot? Maybe we can just tell ninja to >>> build `obj/v8/v8_snapshot/embedded.o` >>> >> >> Yes that's certainly possible. Try the run_mksnapshot target >> <https://cs.chromium.org/chromium/src/v8/BUILD.gn?l=1253&rcl=73b25eab2d914aa2be8eb2d223eee7c1b93b45a0>. >> >> Make sure to use the same git hash and build config though between the >> mksnapshot run and the final V8 build! >> > > Has anyone tried this? We are able to create a 32-bit snapshot_blob.bin > and embedded.S, but we can't inject it into our 64-bit-host build because > ninja wants to recreate the artifacts. > > We ended up solving this by letting the run_mksnapshot_default target finish, then overwriting snapshot_blob.bin and embedded.S with the pre-built 32-bit versions. The build actually errors when trying to build another target, which uses embedded.S.
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