Compiler error on Xcode 12 beta 5 when using ABI stable frameworks

Question

Created Aug ’20

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Hi,

I have an Xcode 11.3.1 (Swift 5.1.3) project that's composed of several ABI stable binary frameworks.

I'm trying to build it now with Xcode 12 beta 5 but on almost all libraries I got this error:

Code Block Failed to build module 'MyModule' from its module interface; the compiler that produced it, 'Apple Swift version 5.1.3 effective-4.2 (swiftlang-1100.0.282.1 clang-1100.0.33.15)', may have used features that aren't supported by this compiler, 'Apple Swift version 5.3 effective-4.2 (swiftlang-1200.0.28.1 clang-1200.0.30.1)'

The library contains all the architectures interface files, such as x86_64-apple-ios-simulator.swiftinterface with the expected content starting with

Code Block swift// swift-interface-format-version: 1.0
// swift-compiler-version: Apple Swift version 5.1.3 effective-4.2 (swiftlang-1100.0.282.1 clang-1100.0.33.15)
// swift-module-flags: -target x86_64-apple-ios11.0-simulator -enable-objc-interop -enable-library-evolution -swift-version 4.2 -enforce-exclusivity=checked -Onone -module-name MyModule

I wonder if the issue resides in the -swift-version and -target version used. Has anyone experienced the same issue?

Cheers

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Answer 1

matbank OP

Aug ’20

After trying different libraries, I found out that:

one library was built with SWIFT_VERSION = 4.2, a different API compared to 5, despite Build library for distribution was set to Yes and the interfaces generated correctly
another library has been built with the minimum iOS set to 8.0
the working ones have been built with Swift language set to 5 and minimum supported iOS version set to 11

Is there an official reference to validate the last point?

0

Answer 2

sulabhfromcharlotte OP

Dec ’20

@matbank : did u found the solution for this issue?

0

Answer 3

giovanni OP

Jun ’21

I ended up on this thread while googling an error with a similar message and log.

In my case, I got the error while working on building a library with CocoaPods and the fix was to add XCTest to the list of linked frameworks.

# CombineTestHelpers.podspec

Pod::Spec.new do |s|
  # ...
  s.framework = 'XCTest'
  # ...
end

You can find the full .podspec here.

I'm not sure how relevant this is for this particular issue, but hopefully it can provide some inspiration. 🤞

0