[build] Add v8gen support for PPC/s390 architecture

[build] Add v8gen support for PPC/s390 architecture

Add PPC/s390 configs to mb_config and BUILD.gn. Also
use a script to get host byte ordering.

R=machenbach@chromium.org, dpranke@chromium.org
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2736993004
Cr-Commit-Position: refs/heads/master@{#43751}
Committed: https://chromium.googlesource.com/v8/v8/+/a7d07a3d2997281b42bb3a7d18420debf888099a

[Dirk Pranke, 2017-03-08 02:04:21]

This roughly lgtm but I defer to machenbach@.

[Michael Achenbach, 2017-03-09 10:32:16]

https://codereview.chromium.org/2736993004/diff/1/infra/mb/mb_config.pyl
File infra/mb/mb_config.pyl (right):

https://codereview.chromium.org/2736993004/diff/1/infra/mb/mb_config.pyl#newc...
infra/mb/mb_config.pyl:134: 'V8 Linux - ppc - sim': 'gn_release_simulate_ppc',
Please reflect this in the CL description. With this you're also migrating PPC
and s390 bots from gyp to gn.

Maybe rather make this two CLs and land the gyp-gn switch separately?

Note, we also run an automated comparison, please review it for anything that
sticks out:
https://build.chromium.org/p/client.v8.ports/builders/V8%20Linux%20-%20ppc%20...

Many flag changes are by design, but maybe there's something else PPC/s390
related that's missing? In particular the defines and other cflags of the
v8_base target.

[Michael Achenbach, 2017-03-09 10:33:45]

To clarify the above comment, I'd land everything, except switching the bots in
mb_config.pyl. That part should come in a separate CL. Then we can check the
output of the automated flag comparison after the first part lands. E.g. in 
https://build.chromium.org/p/client.v8.ports/builders/V8%20Linux%20-%20ppc%20...
the missing -DV8_TARGET_ARCH_PPC etc should go away.

[JaideepBajwa, 2017-03-12 05:44:46]

ptal, I've reverted the bots to use gyp. Will upload another CL for the switch
to gn.
Thank you.

[Michael Achenbach, 2017-03-13 08:30:57]

lgtm

[JaideepBajwa, 2017-03-13 14:04:52]

The CQ bit was checked by bjaideep@ca.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2017-03-13 14:04:55]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-13 14:23:45]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-13 14:23:49]

Dry run: This issue passed the CQ dry run.

[JaideepBajwa, 2017-03-13 15:04:05]

The CQ bit was checked by bjaideep@ca.ibm.com

[JaideepBajwa, 2017-03-13 15:04:06]

The patchset sent to the CQ was uploaded after l-g-t-m from dpranke@chromium.org
Link to the patchset: https://codereview.chromium.org/2736993004/#ps20001
(title: "reverted bots to use gyp")

[commit-bot: I haz the power, 2017-03-13 15:04:14]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-13 15:05:52]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1489417445635540,
"parent_rev": "c418902be4c0d345ec4c562f51819b146cb85be3", "commit_rev":
"a7d07a3d2997281b42bb3a7d18420debf888099a"}

[commit-bot: I haz the power, 2017-03-13 15:05:56]

Description was changed from

==========
[build] Add v8gen support for PPC/s390 architecture

Add PPC/s390 configs to mb_config and BUILD.gn. Also
use a script to get host byte ordering.

R=machenbach@chromium.org, dpranke@chromium.org
BUG=
LOG=N
==========

to

==========
[build] Add v8gen support for PPC/s390 architecture

Add PPC/s390 configs to mb_config and BUILD.gn. Also
use a script to get host byte ordering.

R=machenbach@chromium.org, dpranke@chromium.org
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2736993004
Cr-Commit-Position: refs/heads/master@{#43751}
Committed:
https://chromium.googlesource.com/v8/v8/+/a7d07a3d2997281b42bb3a7d18420debf88...
==========

[commit-bot: I haz the power, 2017-03-13 15:05:57]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/v8/v8/+/a7d07a3d2997281b42bb3a7d18420debf88...