Add SHA-1 flag for code signing

[michaeleisel]

This improves incremental build time by using a faster signing algo (I believe the default is SHA-256). I don't know of any issues with this, and have used it successfully on both real devices and simulators, although feel free to chime in if there are any potential pitfalls.

[diederich]

The interwebs bring nothing up for me regarding this, which is a little surprising.

Though I saw your repos. And yes, if that improves incremental build times, I'm all in :-)

[michaeleisel]

It's an undocumented flag that you can find in https://opensource.apple.com/source/security_systemkeychain/security_systemkeychain-55202/src/codesign.cpp.auto.html, and then if you read through /usr/bin/codesign's contents you can find the options. I'll do a little more double-checking and then merge if all goes well

[diederich]

Thanks for the pointers @michaeleisel!
Did you do any performance comparisons?

[michaeleisel]

Yeah I've found for two different projects it significantly speeds things up. I forget the numbers for the first, but the second went from 2.7s to 1.7s

[diederich]

OK, wow, that sounds definitely worth it. It must be doing a lot of hashing.. 😂

Happy to merge if you're done with testing.

[michaeleisel]

I've tested and am good with this merging