Linux Build Broken in Swift 5.3: kCFStringEncodingDOSLatinUS Not Found about swcompression

[xanderdunn]

It appears this is specific to Swift 5.3. I successfully complied it on 5.2.5. Note that I still can't use it in my project because Swift for Tensorflow is built off trunk, which includes 5.3 changes.

I see the CI for Linux only goes up to Swift 5.2 right now, so that explains why CI is passing.

[tsolomko]

Thank you for bringing this up. It appears that in Swift 5.3 something has been changed in how CoreFoundation is imported into Swift on Linux or something like that. It is maybe related to this thread on swift forums: https://forums.swift.org/t/formalizing-the-unavailability-of-core-foundation/40216

Anyway, I fixed this in 2c46351, and it seems to be successfully compiling in CI (yes, I also added Swift 5.3 builds in CI). Hopefully, I will publish a new release containing this change soon. There is another issue (Carthage/Carthage#3019) impacting SWCompression which I need to add a workaround for first.

P.S. I can only hope that one day Apple will manage to release a new Swift version without introducing subtle unannounced changes which break compilation of other projects...

[tsolomko]

I've released an update to SWCompression (4.5.6) which fixes this issue.