PSA: Mac build changing to x64

[Robert Sesek]

Howdy,

With the release of M39 to the stable channel, Mac is now a 64-bit only browser, however the default configurations and the buildbots all still build 32-bit. It's now time to change the default target_arch used by developers and to update the buildbots to build x64. I'll be landing changes today to make this transition. This should be a completely transparent switch, though please chime in here if you notice any issues.

After the transition is complete, the 32-bit Mac build will be considered deprecated, and it will no longer be maintained. I'll post again here when the transition is finished.

This work is being tracked here: https://code.google.com/p/chromium/issues/detail?id=405542

rsesek / @chromium.org

[Robert Sesek]

Status update after today:

As of right now, local developer builds, the main waterfall, tryserver, blink waterfall, perf, and FYI waterfalls have all been converted to x64. A few more bot configurations need to be switched tomorrow, but the switch appears to be sticking.

There was a little bit of turbulence, so thanks to ncbray@, pdr@, phajdan.jr@, petewil@ and others for helping get through it. Things are looking greener now, but though.

I'll signal again when the transition is complete.

rsesek / @chromium.org

[Robert Sesek]

All the Mac buildbots have been transitioned to x64. There's a few cleanup tasks to finish, but the transition is effectively complete.

rsesek / @chromium.org

[Kenneth Russell]

Very nice. Thanks for handling this transition, especially so smoothly!

-Ken

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