Custom Frameworks don't work with Swift 3

Question

lukeatposse OP

Created Sep ’16

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I have the following set up:

Framework C depends on Framework B
Framework B depends on Framework A
Framework A depends on nothing

I control all the frameworks but for organizational reasons it makes sense that they're split up. This setup worked perfectly fine with Swift 2.2 but in Swift 3 I get the following error whenever I try to add more than one framework to the project:

Apple Swift version 3.0 (swiftlang-800.0.43.6 clang-800.0.38)
Target: x86_64-apple-ios10.0
<unknown>:0: error: merge-module command failed with exit code 1 (use -v to see invocation)

If I add just Framework A as an embedded framework, it compiles and runs fine. If I try to add Framework A + B, I get the error.

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Answer 1

QuinceyMorris OP

Sep ’16

It's not clear what you mean by "A + B". Also, it's not clear whether you "try to add" addtional frameworks targets to the project, or additional frameworks subprojects to the project, or additional frameworks references to the project.

Are all 3 frameworks embedded? In that case, the B target should link against A, the C target should link against B, and the app target should embed A, B and C.

The other, unrelated, possibility is that when you updated the project from Xcode 7 to 8, build settings got changed in such a way that the frameworks ended up with conflicting names. Look in the build settings for anything inappropriate in the bundle identifiers, module names, and product names.

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