[Pythonmac-SIG] Universal build launches as Intel on M1

[Ned Deily]

On 28 Mar 2022, at 10:08, Aivar Annamaa <aivar.annamaa at gmail.com> wrote:
> I have an app bundle, with embedded python.org's universal build of Python 3.10.2 framework and a Tkinter-based GUI (https://github.com/thonny/thonny/releases/tag/v4.0.0b1)
> 
> I've used IDLE's approach in the Info.plist, and the launcher script. Functionally all is working fine, but a M1 user reported, that when opened from Finder, the app is launched in "Intel" mode. When the launcher is invoked in Terminal (/Applications/Thonny.app/Contents/MacOS/thonny), the app gets run in AMD64 mode. I don't have a M1 myself, so I haven't reproduced it myself.
> 
> The same user now said that latest IDLE (3.10.4) runs in AMD64 mode even when launched from Finder.
> 
> Any ideas what to check or try in order to make my app run in native mode?
> 
> My launcher script template is here: https://github.com/thonny/thonny/blob/master/packaging/mac/Thonny.app.initial_template/Contents/MacOS/thonny (shebang becomes gets set to .../Thonny.app/Contents/Frameworks/Python.framework/Versions/3.10/Resources/Python.app/Contents/MacOS/Python by the postinstall script)
> 
> Info.plist template is here: https://github.com/thonny/thonny/blob/master/packaging/mac/Thonny.app.initial_template/Contents/Info.plist


It looks the problem is in your Distribution.plist; change the hostArchitectures to "arm64,x86_64".  Otherwise, the macOS installer assumes your app can only run as an Intel binary.

https://github.com/thonny/thonny/blob/a9d12ba961eac875dc4a77ac1fb226baf5c3acc9/packaging/mac/Distribution.plist#L9

--
  Ned Deily
  nad at python.org -- []