I don’t think we can do this until we stop supporting Mac OS X 10.6. Last time 
we calculated percentage of users, this was still over 15%. I don’t think that 
very many of them would be running 64-bit, either. 10.7 has that problem as 
well, but it is a very small percentage of users.

Syd Polk
sp...@mozilla.com
+1-512-905-9904
irc: sydpolk





> On Aug 5, 2015, at 16:09, Mike Hommey <m...@glandium.org> wrote:
> 
> On Wed, Aug 05, 2015 at 08:22:10AM -0700, Gregory Szorc wrote:
>> 
>> 
>>> On Aug 5, 2015, at 08:12, Ted Mielczarek <t...@mielczarek.org> wrote:
>>> 
>>> Our Universal Mac builds are a frequent headache for build system
>>> work, being a special snowflake in many ways. They also use twice as
>>> much machine time as other builds, since they do a separate build
>>> for each architecture. I think it's time to make a plan to retire
>>> them and ship single-architecture 64-bit only builds.
>>> 
>>> As far as I know, there are two main blockers here: 1) Users with
>>> 32-bit Apple hardware that can't install a 64-bit OS will become
>>> unsupported. I don't have data on how many users this is, but I
>>> suspect we can determine this from Telemetry. It's my understanding
>>> that the last 32-bit only Apple hardware that was sold was in late
>>> 2006, so it's nearly 9 years old at this point.  2) Currently
>>> watching Netflix in Firefox on OS X requires the Silverlight plugin,
>>> which is 32-bit only, so we need to ship a universal build for this
>>> to work. I believe that we are planning to ship an EME CDM that will
>>> work with Netflix in the near future, so this should make this a
>>> non-issue.
>>> 
>>> For comparison, Chrome dropped support for 32-bit OS X late last
>>> year in Chrome 39[1]. If we have a plan to support Netflix without
>>> Silverlight, and we are OK with unsupporting however many users are
>>> stuck on 32-bit only Apple hardware, I think we should make a plan
>>> to switch our official builds to 64-bit only. Does anyone have any
>>> concerns I've missed?
>>> 
>>> -Ted
>>> 
>>> 1.
>>> http://www.computerworld.com/article/2849225/chrome-for-os-x-turns-64-bit-forsakes-early-intel-macs.html
>> 
>> These are the blockers that I recall as well. However, I /think/ we've
>> already decided that  #1 is no longer a hard blocker and we can
>> proceed as soon as #2 is resolved. Dropping universal Mac builds can't
>> come soon enough given the impact to build system complexity and
>> overhead in automation.
> 
> ... until Apple announces ARM64-based Macbooks. </speculation>
> 
> Mike
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