I have two Xcode 11.3.1 projects for iOS 13.2:
- MyFramework: for generating a framework from Swift and Objective-C source files of mine. This source code uses OpenSSL framework, which is embedded in MyFramework using "Embed & Sign" option, so MyFramework is a framework that has a nested framework (OpenSSL).
- TestApp: a swift application that imports MyFramework (and doesn't need OpenSSL functionality).
When I compile MyFramework, the following directory is created in MyFramework Products directory (Xcode correctly includes OpenSSL submodule inside MyFramework):
MyFramework.framework/Frameworks/OpenSSL.framework
Curiously, Modules and Headers directories are missing in "OpenSSL.framework" (have not been copied from the original OpenSSL.framework), but this seems good to me because I don't want to use OpenSSL functionality directly in my TestApp.
However, when I add MyFramework to TestApp and try to compile it, I get the error "Missing required module 'OpenSSL'" in the swift file where the line "import MyFramework" is. This means MyFramework has been correcty found but OpenSSL hasn't.
If I manually add the file MyFramework.framework/Frameworks/OpenSSL.framework/Modules/module.modulemap with the following content (no headers, no exports), then the problem is gone:
framework module OpenSSL {}
Is there a better solution? Why are "Modules" and "Headers" directories not copied? Why is OpenSSL needed in TestApp at compilation time?
Additional note (06-09-2020):
I forgot to mention an important detail. TestApp is able to find OpenSSL framework because I manually added the following path to "Framework Search Paths" in TestApp build setings:
$(PROJECT_DIR)/Frameworks/MyFramework.framework/Frameworks
This puzzles me. If a framework has nested frameworks, why are they not included automatically in searching paths?
I found these questions related to umbrella frameworks in iOS:
- Signing embedded framework not working in Xcode 11.2.1
- iOS 8+ framework with nested embedded framework
Could MyFramework be considered an umbrella framework and Xcode is not fully prepared for such cases?
