Realm-cocoa: Unable to build Realm on Xcode 10

[KyleLeneau]

Goals

To be able to build the realm project with xcode 10 beta 1 OR be included as a dependency with Carthage.

Expected Results

For the build to pass...

Actual Results

I get a failed build that looks like this:

<SOURCE_DIR>/Carthage/Checkouts/realm-cocoa/Realm/module.modulemap:1:18: error: redefinition of module 'Realm'
framework module Realm {
                 ^
<HOME_DIR>Library/Caches/org.carthage.CarthageKit/DerivedData/10.0_10L176w/realm-cocoa/v3.7.1/Build/Intermediates.noindex/ArchiveIntermediates/Realm/IntermediateBuildFilesPath/Realm.build/Release-iphoneos/Realm.build/module.modulemap:1:18: note: previously defined here
framework module Realm {
                 ^
1 error generated.

I even tried opening the project in Xcode 10 to build it manually and got the exact same issue.

Steps to Reproduce

1. Open the project in xcode 10 beta 1 and try build the source
2. OR include the dependency with Carthage and try to update or bootstrap

Note:

Not that this should matter but I also have Xcode 9.2 and Xcode 9.4 installed on my computer but named different app names. Before running any carthage commands I make sure the DEVELOPER_DIR is set to the right xcode app and I make sure xcode-select -p indicates I am using the right version of Xcode too.

Hunch:

When I opened the project I saw 2 modulemap files in source and I am wondering if something in Xcode changed in beta 1 that you are not aware of. Also for a side note, when I look at the full logs for the xcodebuild from Carthage it looks like it's error on the Objective-C compilation steps and not Swift...

Version of Realm and Tooling

Realm framework version: 3.7.1

Realm Object Server version: N/A

Xcode version: Xcode 10 beta 1

iOS/OSX version: iOS 12

Dependency manager + version: Carthage 0.29.1

[sprynmr]

I'm able to build Realm in Xcode 10, but it blows up when we include via Carthage.

Some relevant log bits:

Build system information
error: error: accessing build database "/Users/user/Library/Caches/org.carthage.CarthageKit/DerivedData/10.0_10L176w/realm-cocoa/v3.7.1/Build/Intermediates.noindex/ArchiveIntermediates/Realm/IntermediateBuildFilesPath/XCBuildData/build.db": disk I/O error

** ARCHIVE FAILED **


The following build commands failed:
    CompileC /Users/user/Library/Caches/org.carthage.CarthageKit/DerivedData/10.0_10L176w/realm-cocoa/v3.7.1/Build/Intermediates.noindex/ArchiveIntermediates/Realm/IntermediateBuildFilesPath/Realm.build/Release-iphoneos/Realm.build/Objects-normal/armv7/RLMRealmUtil.o /Users/user/Documents/code/MagicPhotos/Carthage/Checkouts/realm-cocoa/Realm/RLMRealmUtil.mm normal armv7 objective-c++ com.apple.compilers.llvm.clang.1_0.compiler
    CompileC /Users/user/Library/Caches/org.carthage.CarthageKit/DerivedData/10.0_10L176w/realm-cocoa/v3.7.1/Build/Intermediates.noindex/ArchiveIntermediates/Realm/IntermediateBuildFilesPath/Realm.build/Release-iphoneos/Realm.build/Objects-normal/armv7/RLMProperty.o /Users/user/Documents/code/MagicPhotos/Carthage/Checkouts/realm-cocoa/Realm/RLMProperty.mm normal armv7 objective-c++ com.apple.compilers.llvm.clang.1_0.compiler
... etc

[tgoyne]

That one looks like a bug that should be filed with apple.

[sprynmr]

FYI, xcode-select to Xcode 9 and then carthage update worked. Switched back to Xcode 10b1 for development. Works.

Not sure if that's an apple bug or what. Other things compile properly with carthage. ¯_(ツ)_/¯

[sprynmr]

nvm, still blocked. Should have realized that wouldn't work once I imported a module since it's swift 4.1.2 vs 4.2

[tgoyne]

I tried the following steps and it appears to have eventually built successfully:

$ DEVELOPER_DIR=/Applications/Xcode-10.app/Contents/Developer xcrun swift -version
Apple Swift version 4.2 (swiftlang-1000.0.16.7 clang-1000.10.25.3)
$ carthage version
0.29.0
$ echo 'github "realm/realm-cocoa"' > Cartfile
$ rm -rf ~/Library/Developer/Xcode/DerivedData
$ DEVELOPER_DIR=/Applications/Xcode-10.app/Contents/Developer carthage bootstrap

[sprynmr]

Aha! That did the trick. DEVELOPER_DIR seems to be the key. Why is that necessary?

[hummer330]

Above steps do not work for me, any ideas? Thanks

[KyleLeneau]

DEVELOPER_DIR is the global system override to set the right xcodebuild tools as mentioned here.

[kakubei]

Having the same issue with Cocoapod instead of Carthage

[drKreso]

Having the same issue with Cocoapod instead of Carthage

For Cocoapod this helped me:

Close Xcode

rm -rf ~/Library/Developer/Xcode/DerivedData
DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer pod install

Clean project rebuild

[Blackening999]

This helps?
How about Troubleshoothing section ? :)

[danpe]

How was this solved? I'm still getting it with Realm 3.17.3 and Xcode 11.3.1