> 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.
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