Context

When building an iOS project on Codemagic using Xcode 16 (reported as Xcode 26.x in the build environment) with Realm added via Swift Package Manager, the archive step may fail with exit code 65 and a ComputeTargetDependencyGraph error listing unresolved targets such as:

• s2geometry (RealmDatabase)

• Bid (RealmDatabase)

• RealmDatabase_RealmCoreResources

• Realm_Realm

• Realm_RealmSwift

This typically occurs when using -disableAutomaticPackageResolution and -clonedSourcePackagesDirPath in the build configuration.

Answer

There are two distinct issues that can cause this failure. Follow the steps below to resolve both.

Issue 1: Xcode cannot attach the SPM dependency graph during the archive step

When building directly from an .xcodeproj file in CI, Xcode may fail to fully load the Swift Package Manager dependency graph into the archive build session, causing the ComputeTargetDependencyGraph error. To fix this, ensure your workflow:

1. Builds using the .xcworkspace instead of .xcodeproj.

2. Uses the same SourcePackages directory for both the resolve and archive steps.

Here is a working codemagic.yaml example:

workflows:
  ios-workflow:
    name: iOS Build
    environment:
      xcode: 26.4

    cache:
      cache_paths:
        - $CM_BUILD_DIR/SourcePackages
        - ~/Library/Caches/org.swift.swiftpm

    scripts:
      - name: Resolve Swift Packages
        script: |
          mkdir -p "$CM_BUILD_DIR/SourcePackages"
          xcodebuild \
            -resolvePackageDependencies \
            -workspace "YourApp.xcworkspace" \
            -scheme "YourScheme" \
            -clonedSourcePackagesDirPath "$CM_BUILD_DIR/SourcePackages"

      - name: Build IPA
        script: |
          xcode-project build-ipa \
            --workspace "YourApp.xcworkspace" \
            --scheme "YourScheme" \
            --archive-xcargs "-clonedSourcePackagesDirPath $CM_BUILD_DIR/SourcePackages -disableAutomaticPackageResolution"

    artifacts:
      - build/ios/ipa/*.ipa
      - /tmp/xcodebuild_logs/*.log

Issue 2: Realm Core's s2geometry C++ compatibility error with Xcode 16

If the build still fails after switching to .xcworkspace, the root cause is a C++ compatibility issue in older versions of Realm Core. The s2geometry dependency bundled with older Realm versions attempts to specialize std::is_pod, which is explicitly forbidden by the newer C++ standard library used in Xcode 16's toolchain.

To fix this, upgrade your realm-swift Swift Package dependency to version 20.0.4 or higher, which contains the official fix. You can do this either through the Xcode UI or by updating the version constraint in your project.pbxproj file:

/* Begin XCRemoteSwiftPackageReference section */
    XXXXXXXXXXXXXXXXXXXXXXXX /* realm-swift */ = {
        isa = XCRemoteSwiftPackageReference;
        repositoryURL = "https://github.com/realm/realm-swift.git";
        requirement = {
            kind = upToNextMajorVersion;
            minimumVersion = 20.0.4;
        };
    };

For more details, refer to the official GitHub issues tracking this problem:

• realm-swift issue #8812

• realm-swift issue #8823