Mat Kelly

```xml LSBackgroundOnly 1 ``` appears to be _a_ culprit.

This same behavior occurs with a dummy program: ```sh machawk1@Mats-M1-Mac /tmp % echo "print('hello world')" > hello.py machawk1@Mats-M1-Mac /tmp % pyinstaller --onefile --target-arch universal2 hello.py 41 INFO: PyInstaller: 5.0.dev0 41...

Watch https://github.com/pyinstaller/pyinstaller/pull/5883 I think the support for universal2 is just in the `develop` branch and has not yet been merged into master.

I pulled from the current HEAD of the develop branch of the pyinstaller repo ( 000275e409640320cdd995a7f077abfdece86749 ), rebuilt the bootloaders per the WAIL MAKEFILE script, installed pyinstaller, tried to rebuild...

The commit that enables this in Pyinstaller is c67a0d7f465e5c14f8a85d53efaeddfc37eb774d , which is not yet part of their master branch's history but is present in their develop branch. When this is...

Pyinstaller 4.4 provides support for Apple Silicon: https://pyinstaller.readthedocs.io/en/stable/CHANGES.html#id1

A hello world program with PyInstaller 4.4 using `pyinstaller --onefile --noconsole --target-architecture universal2 hello.py` fails to build. We might need to manually build the universal bootloader, despite the release.

Re-compiling the bootloader per #494 with the commit aligning with Pyinstaller 4.4 then installing causes the same issue to be reported, i.e., `....so is not a fat binary!` and nothing...

Pyinstaller 4.5 released on August 1, 2021 purports to fix issues with architecture detection: https://pyinstaller.readthedocs.io/en/stable/CHANGES.html#id1

I am still unable to build a universal2 binary with the latest release, Pyinstaller 4.5.1. ```sh /tmp % echo "print('hello world')" > hello.py /tmp % pyinstaller --onefile --target-arch universal2 hello.py...