Clang Dependency failure on XCode26 in a cocoapods project

[sandammeer]

We are using Nimble 13.7.1 in a Cocoapods Project and are getting this error when complinig with Xcode26.
Is someone else experiencing the same problem or has a solution to this issue?

[winkelsdorf]

I was able to reproduce and fix that, as always the error message is a bit misleading:

Seems like Xcode26 is a bit pickier when it comes to transitive dependencies. Nimble has a dependency on XCTest. If a Podspec requires Nimble outside of tests (meaning outside of |test_spec| to extend test functionality), XCTest must also be specified as a framework dependency in the Podspec itself.

Pod::Spec.new do |s|
  s.name = 'MyNimbleUtils'
  s.version = '1.0.0'
  s.summary = 'My Nimble utilities'
  s.source = { :path => './' }

  s.source_files = 'Sources/MyNimbleUtils/**/*'
  
  s.dependency 'Nimble'
  
  # Fix for Xcode 26
  #   Clang dependency scanner failure: While building module 'Nimble' imported from Nimble-*.input:1:
  #   Nimble-Swift.h:286:9: fatal error: module 'XCTest' not found
  s.framework = 'XCTest'  # this solves the issue
end

I would say it's more of a CocoaPods problem in conjunction with Xcode 26, which occurs here due to the XCTest dependency of Nimble.

[younata]

Thanks @winkelsdorf for this! I appreciate the investigation here.

[paulz]

workaround we've been using:

post_install do |installer|
    require 'fileutils'

    installer.pods_project.targets.each do |target|
      target.build_configurations.each do |config|
        if target.name.start_with?("Nimble")
          xcconfig_path = config.base_configuration_reference.real_path
          xcconfig = File.read(xcconfig_path)
          new_xcconfig = xcconfig.sub('lswiftXCTest', 'lXCTestSwiftSupport')
          File.open(xcconfig_path, "w") { |file| file << new_xcconfig }
        end
      end
    end
end