This is fantastic! I'm testing it out now, the first big issue I've noticed is that Swift pods with Swift dependencies need their dependencies' build paths in their SWIFT_INCLUDE_PATHS.

Here's a sample project for this TestSwiftNestedDependencies.zip (looks like Sonar doesn't actually compile in Swift 4, but it still shows the issue).

This can be fixed by adding ${PODS_CONFIGURATION_BUILD_DIR}/Alamofire to Sonar's SWIFT_INCLUDE_PATHS

The next issue I've noticed is that if you have a Swift pod that depends on an Objective-C pod, it has trouble building the module:

Here's an example project TestObjectiveCDependency.zip

In this project I've added the SWIFT_INCLUDE_PATHS mentioned above. I've solved a similar problem like this before by making the path in the module map absolute, but that doesn't seem to work in this case. Either way I assume there's a better solution for that 🤔

@keith Both of those projects build for me now 👍.

Nice! Looks like that works on my end too. I noticed that specs using module_name don't seem to set the PRODUCT_NAME correctly. It looks like you explicitly commented that out though? If you want a test pod for that ModelMapper defines the module name as Mapper

@keith I wasn't sure if it was going to be needed, but looks like it will be 👍

Next thing I ran into is it seems that the Facebook SDK fails to build statically because of some non modular include warnings. I don't see this when using frameworks today. This obviously could 100% be on them, but figured it was worth mentioning. Here's a sample project: TestFacebookSDK.zip

Hmm actually it looks like it's happening with other Objective-C pods we're using as well. I can give another project example if needed.

@keith Good to know - a smaller example than FBSDK would be handy, but I think that's because I'm not preserving header paths properly yet.

Here's a slightly smaller example. It appears to be an issue with imports referencing nested Objective-C dependencies, so this example also has 2 dependencies: TestLightstep.zip

Ah the problem appears to be the imports in the umbrella header generated by CP. In both of these sample projects, commenting all the imports in that file out makes them compile.

Is there a pre version of cocoapods where static swift libs can be tried out?

@dantoml I tried your branch and applied it to our large scale project. In addition to your changes, I also made following changes for our project to build:

• module_map.rb "framework module" -> "module" for static lib
• pod_xcconfig.rb add dependent_targets' configuration_build_dir to HEADER_SEARCH_PATHS for Xcode to be able to find modulemap and umbrella headers
• xcconfig_helper.rb add "-import-underlying-module" for swift/objc hybrid libs
• tweaks in pod_target_installer.rb

There is however one issue left: make a swift class visible to ObjC class which depends on the lib. In theory this requires @import module -> modulemap -> umbrella -> module-Swift.h inclusion chain. I can copy it from derived-object folder but I am not sure if it's the best approach.

I attached my diff. It's just a quick hack and really messy. Let me know if you wanna collaborate.

Is this branch still being updated? Is there anything we can do to help move this along?

@Pearapps yes! if you feel you can move this faster than the current pace feel free to pick it up and get it past the finish line.

As a reminder, most of the work in CocoaPods is done from people's free time. There is never a deadline or strict timeline to get things done.

I opened up a PR against this that uses that diff that @chenxiao0228 put up in a previous comment #7067

Sorry for the silence on this, I've been super busy lately, and CocoaPods feature work has taken a back seat.

I'm taking another look at this today.

@chenxiao0228 Thanks for that diff, coercing module maps into the right format was one of the things I was wondering about.

Punted to 1.5.0.

Reviving this for 1.5.0 now that 1.4.0 shipped.

Rebased, this is basically ready to go!

Question: Will this resolve the issue with transitive dependency stuff?