This copy of libswiftCore.dylib requires an OS version prior to 12.2.0

[andrea-tech]

Using the latest available version on BigBoss on an iPhone 6 running 12.4

SpringBoard dies with the error mentioned in title.

Only happens when I actually compile a Swift 5 source file in my project.

I tried deploying this from my own machine running Xcode 10.2.1 but got the same result.

[kabiroberai]

Is your project a SpringBoard tweak?

[andrea-tech]

Yes it is

[kabiroberai]

I’m planning to issue an update to help resolve this issue, but for now I’d recommend modifying your libswift dependency to firmware (>= 12.2) | ${LIBSWIFT}. Let me know if that fixes it

[andrea-tech]

Never mind, it seems that it had something to do with the way theos itself executes the build commands. I tried just compiling Swift Cocoa Touch Framework in Xcode and deploying that as a dylib and it worked just fine (even without the libswift package).

So yeah, looks like theos + this libswift is a no-go for now.

[kabiroberai]

The reason Xcode works fine is because it directly loads Swift from the system location, /usr/lib/swift. Meanwhile, Theos first checks /usr/lib/libswift and falls back to /usr/lib/swift if the former doesn’t exist (done using an rpath). This means that although Xcode libraries will work fine on iOS 12.2+, they’ll break on lower versions.

I realise that modifying the Depends: might not be the best solution since libswift could be pre-installed, so you might need to wait for an update to libswift in order to have your tweak work on both iOS 12.2+ as well as below. For now, a hacky workaround to test your tweak on iOS 12.2+ could be adding override _THEOS_TARGET_SWIFT_VERSION_PATH = ../swift to the top of your Makefile