Cannot build DataDog with SPM as a dependency in a private framework

[mergesort]

Describe the bug

I have a reasonably complex project (30-40,000 LOC) and a rather modularized app. Unfortunately after I added a dynamic library (required for AppIntents to be modularized, I cannot get DataDog to build properly. If I do not import the DataDog package, my new framework will build just fine, but when I add it (transitively as a dependency), the framework stops building.

Reproduction steps

I'm seeing a similar error message to #1085, and tried to apply the fix of adding -Xcc -fmodule-map-file=\"$(GENERATED_MODULEMAP_DIR)/_Datadog_Private.modulemap\" flags.

The shape of the packages and frameworks that cause this issue are approximately:

• A static SPM framework (let's call this SPM A)
• A dynamic SPM library (let's call this SPM B)
• A dynamic library (let's call this Library A)
• Two targets, an iOS app and a widget

The dependency tree looks like so:

• iOS app imports Library A
• Library A imports SPM B
• SPM B imports SPM A
• SPM A imports DataDog, like so

import PackageDescription

let package = Package(
    name: "PlinkyLogging",
    platforms: [
        .iOS(.v17),
        .macOS(.v13)
    ],
    products: [
        .library(
            name: "PlinkyLogging",
            targets: ["PlinkyLogging"]
        )
    ],
    dependencies: [
        .package(url: "https://github.com/Datadog/dd-sdk-ios.git", exact: Version(2, 15, 0)),
        .package(path: "../Scribbles")
    ],
    targets: [
        .target(
            name: "PlinkyLogging",
            dependencies: [
                .product(name: "DatadogCore", package: "dd-sdk-ios", condition: .when(platforms: [.iOS])),
                .product(name: "DatadogLogs", package: "dd-sdk-ios", condition: .when(platforms: [.iOS])),
                .product(name: "Scribbles", package: "Scribbles")
            ]
        )
    ]
)

SDK logs

When I try to build this tree structure, I get these error messages. (Where PlinkyAppIntents is equivalent to Library A.)

<unknown>:0: error: missing required module 'DatadogPrivate'
/Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/PlinkyAppIntents.build/Objects-normal/arm64/PlinkyAppIntents.private.swiftinterface:1:1: error: failed to verify module interface of 'PlinkyAppIntents' due to the errors above; the textual interface may be broken by project issues or a compiler bug
// swift-interface-format-version: 1.0

The full error log looks like this.

SwiftVerifyEmittedModuleInterface normal arm64 Verifying\ emitted\ module\ interface\ PlinkyAppIntents.swiftinterface /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/PlinkyAppIntents.build/Objects-normal/arm64/PlinkyAppIntents.swiftinterface (in target 'PlinkyAppIntents' from project 'Plinky')
    cd /Users/mergesort/Developer/Plinky
    builtin-swiftTaskExecution -- /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -typecheck-module-from-interface /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/PlinkyAppIntents.build/Objects-normal/arm64/PlinkyAppIntents.swiftinterface -target arm64-apple-ios17.2-simulator -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator18.1.sdk -I /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator -no-color-diagnostics -enable-library-evolution -enable-testing -g -debug-info-format\=dwarf -dwarf-version\=4 -module-cache-path /Users/mergesort/Library/Developer/Xcode/DerivedData/ModuleCache.noindex -swift-version 5 -enforce-exclusivity\=checked -Onone -D DEBUG -D DEBUG -serialize-debugging-options -const-gather-protocols-file /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/PlinkyAppIntents.build/Objects-normal/arm64/PlinkyAppIntents_const_extract_protocols.json -enable-experimental-feature DebugDescriptionMacro -enable-experimental-feature OpaqueTypeErasure -enable-bare-slash-regex -validate-clang-modules-once -clang-build-session-file /Users/mergesort/Library/Developer/Xcode/DerivedData/ModuleCache.noindex/Session.modulevalidation -Xcc -working-directory -Xcc /Users/mergesort/Developer/Plinky -resource-dir /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift -enable-anonymous-context-mangled-names -file-compilation-dir /Users/mergesort/Developer/Plinky -Xcc -fmodule-map-file\=/Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/GeneratedModuleMaps-iphonesimulator/DatadogPrivate.modulemap -Xcc -D_LIBCPP_HARDENING_MODE\=_LIBCPP_HARDENING_MODE_DEBUG -Xcc -ivfsstatcache -Xcc /Users/mergesort/Library/Developer/Xcode/DerivedData/SDKStatCaches.noindex/iphonesimulator18.1-22B5023b-f62f332bdfa1a9e81825a8fb829964d1.sdkstatcache -Xcc -I/Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/PlinkyAppIntents.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/PlinkyAppIntents.build/PlinkyAppIntents-generated-files.hmap -Xcc -I/Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/PlinkyAppIntents.build/PlinkyAppIntents-own-target-headers.hmap -Xcc -I/Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/PlinkyAppIntents.build/PlinkyAppIntents-all-non-framework-target-headers.hmap -Xcc -ivfsoverlay -Xcc /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/Plinky-55f32dabc6dadfc07dccd87fc9b8887c-VFS-iphonesimulator/all-product-headers.yaml -Xcc -iquote -Xcc /Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/PlinkyAppIntents.build/PlinkyAppIntents-project-headers.hmap -Xcc -I/Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/SourcePackages/checkouts/dd-sdk-ios/DatadogCore/Private/include -Xcc -I/Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Products/Debug-iphonesimulator/include -Xcc -I/Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/PlinkyAppIntents.build/DerivedSources-normal/arm64 -Xcc -I/Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/PlinkyAppIntents.build/DerivedSources/arm64 -Xcc -I/Users/mergesort/Library/Developer/Xcode/DerivedData/Plinky-erlmwxneafajiwamkoqolwxeqxmz/Build/Intermediates.noindex/Plinky.build/Debug-iphonesimulator/PlinkyAppIntents.build/DerivedSources -Xcc -DDEBUG\=1 -module-name PlinkyAppIntents -frontend-parseable-output -disable-clang-spi -target-sdk-version 18.1 -target-sdk-name iphonesimulator18.1 -external-plugin-path /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/lib/swift/host/plugins\#/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/swift-plugin-server -external-plugin-path /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/local/lib/swift/host/plugins\#/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/swift-plugin-server -plugin-path /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/local/lib/swift/host/plugins

Command SwiftVerifyEmittedModuleInterface failed with a nonzero exit code

Expected behavior

I would expect the library to build. I've tried all of the usual debugging steps, clean, build, wipe derived data, reboot, etc.

Affected SDK versions

2.15.0

Latest working SDK version

I haven't tried old versions with this structure.

Did you confirm if the latest SDK version fixes the bug?

Yes

Integration Methods

SPM

Xcode Version

Version 16.1 beta (16B5001e) — but was possibly broken before.

Swift Version

Swift 6.0

MacOS Version

14.5

Deployment Target

iOS 17

Device Information

No response

Other relevant information

No response