Build failing with Xcode 7.3 beta

[vhain]

My configuration is:

• Using latest Xcode 7.3 beta (7D129n)

• Using latest version of Cocoapods (0.39.0)

• with Podfile:

  use_frameworks!
  
  target 'app' do
  
  pod 'SQLite.swift'
  
  end
  

I tried with or without xcode-select -s [PATH_TO_XCODE_BETA] or xcode-select -s [PATH_TO_XCODE], but they both failed by following reason:

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include/module.modulemap:1:8: error: redefinition of module 'Compression'
module Compression [system] [extern_c] {
       ^
/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/module.modulemap:1:8: note: previously defined here
module Compression [system] [extern_c] {
       ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include/module.modulemap:6:8: error: redefinition of module 'Darwin'
module Darwin [system] [extern_c] {
       ^
/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/module.modulemap:6:8: note: previously defined here
module Darwin [system] [extern_c] {
       ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include/module.modulemap:1478:8: error: redefinition of module 'os'
module os [system] [extern_c] {
       ^
/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/module.modulemap:1599:8: note: previously defined here
module os [system] [extern_c] {
       ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include/module.modulemap:1494:8: error: redefinition of module 'libkern'
module libkern [system] [extern_c] {
       ^
/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include/module.modulemap:1615:8: note: previously defined here
module libkern [system] [extern_c] {
       ^
<unknown>:0: error: could not build Objective-C module 'SQLite'

[groue]

Hello,

Try the following:

• Update Xcode to the latest 7.3 beta 3 (7D141l)
• Change the path to sqlite3.h in podstuff/module.modulemap by replacing Xcode.app with Xcode-beta.app.

You may need to clean everything before Xcode notices the change, though.

[vhain]

solved. thanks @groue !

[shnhrrsn]

The behavior for this appears to have changed in the final version of Xcode 7.3, at least for AppleTV (haven't tested iOS yet).

Previously, for AppleTV using iPhoneOS.platform worked fine. However as of 7.3, when building for device the platform in the path needs to be AppleTVOS.platform and when building for simulator, the path needs to be AppleTVSimulator.platform.

If the platforms don't match, it results in the above "redefinition of module" errors. I suspect this is likely affecting iOS as well.

[cjwirth]

I can confirm that it's the same on iOS. I can build and run on the device, but running through the simulator gives me the redefinition of module errors like you said.

[gblotter]

+1 to what cjwirth and shnhrrsn said

[groue]

For your information, GRDB.swift could solve this issue by moving the SQLite C functions declarations in a separate module, which depends on both the target (OSX framework or iOS framework) and the platform (device, simulator):

• The module map: https://github.com/groue/GRDB.swift/blob/v0.52.0/Support/module.modulemap
• How to import the SQLite C functions in a Swift file: https://github.com/groue/GRDB.swift/blob/v0.52.0/GRDB/Core/Support/StandardLibrary/StandardLibrary.swift#L1-L9

I wish it was simpler, but at least it works.

[stephencelis]

The module map is only necessary for CocoaPods, which makes this kind of ceremony pretty unfortunate. I think half of it can be simplified using separate spec.ios and spec.osx flags, though.

[groue]

I don't know if this is still true, @stephencelis. Since 7.3 betas, Xcode has gotten very picky when you include a header from an SDK which is not the one you build for. It used to work, yes. But now it looks like this is the root of all this issue of SQLite.swift. But maybe I have missed something.

[stephencelis]

@groue My hope is that CocoaPods will eventually be able to distinguish between iOS and iOS Simulator module maps. E.g.,

spec.osx.module_map = 'path/to/osx/module.modulemap'
spec.ios.module_map = 'path/to/ios/module.modulemap'
spec.ios.simulator.module_map = 'path/to/ios_simulator/module.modulemap'
# ...

[groue]

Actually, even GRDB tests won't run in the simulator unless I pick the exact header for the iPhoneSimulator platform .../iPhoneSimulator.platform/... (and of course CocoaPods is not involved).

Don't you have this issue as well?

[stephencelis]

Filed an issue here: CocoaPods/CocoaPods#5071

In the meantime, installing the project manually or using Carthage are temporary fixes, while I'll accept PRs with @groue's solution above @cjwirth's solution below (I don't have time to carve out a solution for CocoaPods right now).

Edit: This solution appears to be less invasive: #349 (comment)

[stephencelis]

Actually, even GRDB tests won't run in the simulator unless I pick the exact header for the iPhoneSimulator platform .../iPhoneSimulator.platform/... (and of course CocoaPods is not involved).

Don't you have this issue as well?

@groue The framework tests run fine. SQLite.swift uses an SDK root-relative header.

[groue]

The framework tests run fine. SQLite.swift uses an SDK root-relative header

OK so I guess that you don't test against the SQLite.swift framework, but you embed SQLite.swift sources in your test target. I get it.

[stephencelis]

OK so I guess that you don't test against the SQLite.swift framework, but you embed SQLite.swift sources in your test target. I get it.

I'm probably not communicating very well, but nope, I test against the framework itself and everything works just fine. Feel free to check out the repo!