xcframework does not contain internal frameworks

Question

I am trying to create an .xcframework file for a few third party libraries I'm using. Following the instructions from https://appspector.com/blog/xcframeworks, I

1. Create platform-specific framework files:

# Archive for device
xcodebuild archive -scheme TestFramework -destination="iOS" -archivePath /tmp/xcf/ios.xcarchive -derivedDataPath /tmp/iphoneos -sdk iphoneos SKIP_INSTALL=NO BUILD_LIBRARIES_FOR_DISTRIBUTION=YES

# Archive for simulator
xcodebuild archive -scheme TestFramework -destination="iOS Simulator" -archivePath /tmp/xcf/iossimulator.xcarchive -derivedDataPath /tmp/iphoneos -sdk iphonesimulator SKIP_INSTALL=NO BUILD_LIBRARIES_FOR_DISTRIBUTION=YES

At this point, I've gotten two frameworks with .swiftmodule files; everything looks good. The frameworks do not come with .swiftinterface files, but I think that is alright as these are objc projects. Then, I

2. Combine the individual frameworks to form a single xcframework file:

# Build xcframework with two archives
xcodebuild -create-xcframework -framework /tmp/xcf/ios.xcarchive/Products/Library/Frameworks/TestFramework.framework -framework /tmp/xcf/iossimulator.xcarchive/Products/Library/Frameworks/TestFramework.framework -output /tmp/xcf/TestFramework.xcframework

Here, xcodebuild doesn't fail, but it emits a curious error:

No 'swiftinterface' files found within '/Users/user/git/ReactiveObjC/output/xcf/ios.xcarchive/Products/Products/Library/TestFramework.framework/Modules/TestFramework.swiftmodule'.

Crucially, the .xcframework package does not contain the individual frameworks or folders specified in the Info.plist file. Obviously, when I try to link to the xcframework in this state, I get a bunch of "missing symbols" linker errors.

Why is this? What must I do to get xcodebuild to create the xcframework completely?

NB: Manually creating the folders seems to work for now, but this feels wrong and is brittle – Apple can change the way xcodebuild works anytime.

Answer 1

Turns out that adding BUILD_LIBRARY_FOR_DISTRIBUTION = YES to the end of the xcodebuild command was not enough / not working to produce a framework with the required swiftinterface files. I had to go in the settings for the actual project and manually set BUILD_LIBRARY_FOR_DISTRIBUTION to YES, like this answer suggests. After I got the frameworks with the swiftinterface files, I was then able to create the xcframework file using xcodebuild without any problems.