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RxSwift 4.4 can't be integrated as Cocoapods static library due to RxAtomic dependency #1800

robmaceachern opened this Issue Nov 13, 2018 · 6 comments


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robmaceachern commented Nov 13, 2018

Short description of the issue:

Cocoapods (1.6.0.beta.2) can't integrate RxSwift 4.4 as a static library without workarounds. RxSwift 4.3 doesn't have this problem. Sample Podfile:

platform :ios, '11.0'

target 'Project' do
  pod 'RxSwift', '~> 4.4'

Expected outcome:

pod install succeeds: Pod installation complete!

What actually happens:

pod install fails:

[!] The following Swift pods cannot yet be integrated as static libraries:

The Swift pod `RxSwift` depends upon `RxAtomic`, which do not define modules. To opt into those targets generating module maps (which is necessary to import them from Swift when building as static libraries), you may set `use_modular_headers!` globally in your Podfile, or specify `:modular_headers => true` for particular dependencies.


  1. Add use_modular_headers! to the Podfile. This allows the integration to succeed but it applies to all pods in the Podfile (I'm not sure what side-effects this could potentially have).
  2. Add pod 'RxAtomic', '~> 4.0', :modular_headers => true to the Podfile. Allows integration to succeed. Not sure about the side-effects but should be safer than use_modular_headers!.

RxSwift/RxCocoa/RxBlocking/RxTest version/commit



  • iOS
  • macOS
  • tvOS
  • watchOS
  • playgrounds

How easy is to reproduce? (chances of successful reproduce after running the self contained code)

  • easy, 100% repro
  • sometimes, 10%-100%
  • hard, 2% - 10%
  • extremely hard, %0 - 2%

Xcode version:


Installation method:

  • CocoaPods
  • Carthage
  • Git submodules

I have multiple versions of Xcode installed:
(so we can know if this is a potential cause of your issue)

  • yes (9.4.1, 10.0, 10.1)
  • no

Level of RxSwift knowledge:
(this is so we can understand your level of knowledge
and formulate the response in an appropriate manner)

  • just starting
  • I have a small code base
  • I have a significant code base

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kzaher commented Nov 14, 2018

Hi @robmaceachern ,

The workarounds you've suggested are only workarounds for Podfile. Any idea what should we do to add proper support? PR?


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radex commented Nov 15, 2018

I have the same issue, but the workarounds are not working for me. My Podfile setup is… well… pretty complicated:

def common
  pod 'RxSwift',                '~> 4.0', inhibit_warnings: true
  pod 'RxCocoa',                '~> 4.0'
  pod 'RxAtomic',               '~> 4.0', :modular_headers => true
  # other pods…

abstract_target 'CommonIOS' do
  platform :ios, '11.2'


  target 'iOS' do
    # other pods

  target 'NozbeKit' # <- this is a framework included by main app and also app extensions of the same app
  # … app extensions

target 'WatchApp' do
  platform :watchos, '3.0'


(I don't have a solution to offer, but I thought I'll post this so that a nested frameworks case is taken into account in the discussion :) )


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kzaher commented Nov 15, 2018

Ok, but does anyone know what do we need to add to our RxAtomic podfile to support this properly?


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robmaceachern commented Nov 15, 2018

I’m not very familiar with the details of this but it looks like what is required is setting DEFINES_MODULE in the podspec config settings. From the Cocoapods 1.5 release notes:

... you will be able to opt into stricter header search paths (and module map generation for Objective-C pods). As a pod author, you can add 'DEFINES_MODULE' => 'YES' to your pod_target_xcconfig.

So something like this to RxAtomic.podspec might work:

s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES' }

I don't have time for a PR at the moment but if some free time opens up I can give it a try.

Possibly useful info:
ios - Is there any downside to setting DEFINES_MODULE = YES in my podspec? - Stack Overflow


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kzaher commented Dec 14, 2018

As far as I can tell adding use_modular_headers! to top of Podfile works.

Adding s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES' } to RxAtomic.podspec doesn't work as far as I can tell. (Cocoapods 1.6.0-beta.2)

Does anybody have any more information?

kzaher added a commit that referenced this issue Dec 16, 2018


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kzaher commented Dec 16, 2018

There was caching issue.

@kzaher kzaher closed this Dec 16, 2018

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