running platform-native by default

Phil Davis phil at
Fri Mar 24 14:46:38 EDT 2023

Thanks Mark. Last night I discovered I could do that, but it revealed a 
well-hidden bug in one app when launched on either platform, so for now 
I may just deliver 2 versions of the app.

Thank you!

On 3/24/23 1:10 AM, Mark Waddingham via use-livecode wrote:
> On 2023-03-22 19:45, Phil Davis via use-livecode wrote:
>> I'm using LC 9.6.8 to build some macOS Intel/Silicon ("dual-native") 
>> apps.
>> Upon first launch of these apps on my Silicon test machine, I always
>> get the OS dialog that says "To open '<my app>', you need to install
>> Rosetta. Do you want to install it now?" I always click the "Not Now"
>> button because I want the apps to run native by default, wherever they
>> are running. (I'm avoiding installing Rosetta on that machine.)
>> I discovered I can avoid getting the Rosetta dialog this way: After
>> installation and before first launch, do a "get info" on the installed
>> app. In the macOS Info dialog, check AND uncheck the "Open using
>> Rosetta" checkbox. Close the dialog and now the app will launch in
>> native (Silicon) mode.
>> Is there a way to pre-set my apps so their first launch uses the
>> engine that's native to the platform they're installed on? It seems
>> like there ought to be a way. I can't expect all my users to jump
>> through this manual hoop - and it just looks unprofessional to me.
> Yes - you just need to tweak the plist - there's an 
> LSArchitecturePriority (or similar!) entry which determines the order 
> the slices in the executable are considered.
> We made x86-64 the primary architecture in 9.6.8 to ensure by default 
> people didn't potentially use an architecture (i.e. arm64) which 
> hadn't been well tested (i.e. making it optin).
> In 9.6.9-rc-3 (which is, hopefully, imminent!), we'll be removing the 
> experimental tag from the arm64 slice and make the priority the 
> default - i.e. on arm macs LC and its standalones will run using the 
> native (arm64) architecture by default.
> Warmest Regards,
> Mark.

Phil Davis
(503) 307-4363

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