Add support for Apple Silicon and Big Sur

[msanders]

Partly taken from upstream in Reflejo#18.

It's necessary to create a universal binary to avoid the following error when a program running in Rosetta invokes sudo:

sudo: unable to initialize PAM: No such file or directory

Fixes #7.

[sebastianludwig]

Verified that it works as intended on M1 and Big Sur 🚀

[joshmedeski]

It's also working for me on a Mac mini M1 (macOS Big Sur Version 11.2.3 (29D91) 🥳

Thanks @msanders!

[thebitstick]

This should get merged someday!

[joshmedeski]

It may have to resolve the target value from the system:

TARGET = $(swift -version)

Is this enough to work across different chip sets?

[joshmedeski]

I had to update the TARGET for macOS 11.4

TARGET = apple-darwin20.5.0

I also had to manually add write permissions to the sudo file.

$ sudo chmod +w sudo

Then I was able to complete the install steps successfully:

1. $ sudo make install
2. Edit /etc/pam.d/sudo to include as the first line:

auth sufficient pam_watchid.so "reason=execute a command as root"

[myyra]

I think the -target flag can be removed completely (as I understand it's set to the current platform by default). At least it worked fine for me.

[msanders]

The target flag is required to make a universal binary so it can work under Rosetta. You can reproduce the above error with:

arch -x86_64 sudo echo

[joshmedeski]

The latest version of macOS, Version 11.6 (20G165) works when you follow my instructions above and replace the target with this:

TARGET = apple-darwin20.6.0