'carthage build' failed to copy frameworks for macOS.

[aalenliang]

• carthage version: 0.18
• xcodebuild -version: Xcode 8.0, Build version 8A218a
• Are you using --no-build? No
• Are you using --no-use-binaries? No
• Are you using --use-submodules? No

Cartfile

github "madebybowtie/FlagKit" "swift3"

Carthage Output

*** xcodebuild output can be found in /var/folders/nt/lsvh10qs52s65kdw5bn126m40000gn/T/carthage-xcodebuild.1vB5wa.log
*** Building scheme "FlagKit" in FlagKit.xcodeproj
Failed to write to /Users/liangalen/Documents/Projects/SeedLab/AccessControlExample/Carthage/Build/Mac/FlagKit.framework: Error Domain=NSCocoaErrorDomain Code=260 "The file “FlagKit.framework” couldn’t be opened because there is no such file." UserInfo={NSFilePath=/Users/liangalen/Library/Developer/Xcode/DerivedData/FlagKit-fwwepxalaneinngomftamewytxrp/Build/Products/Release-iphoneos/FlagKit.framework, NSUnderlyingError=0x7faabc14fd00 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}

Issue Description
The framework I used (FlagKit) has only one target with Base SDK: iOS 10.0, supported platforms: macosx iphonesimulator iphoneos appletvsimulator appletvos:

Carthage always tries to copy the framework in base sdk folder (Release-iphoneos) to /Build/Mac. Hence it failed to build because:

Failed to write to .../Carthage/Build/Mac/FlagKit.framework: Error Domain=NSCocoaErrorDomain Code=260 "
The file “FlagKit.framework” couldn’t be opened because there is no such file."UserInfo={NSFilePath=
.../Xcode/DerivedData/FlagKit-fwwepxalaneinngomftamewytxrp/Build/Products/Release-iphoneos/FlagKit.framework, NSUnderlyingError=0x7faabc14fd00 
{Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}

I tried to set the baseSDK to tvOS 10.0 for FlagKit project in /Checkout/FlagKit folder, and run 'carthage build', the output turns out to be

Failed to write to .../Carthage/Build/Mac/FlagKit.framework: Error Domain=NSCocoaErrorDomain Code=260 "
The file “FlagKit.framework” couldn’t be opened because there is no such file."UserInfo={NSFilePath=
.../Xcode/DerivedData/FlagKit-fwwepxalaneinngomftamewytxrp/Build/Products/Release-appletvos/FlagKit.framework, NSUnderlyingError=0x7faabc14fd00 
{Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}

Though I can using 'carthage build --platform iOS' to force build a framework file in the base sdk folder, after 'carthage build' successful, I drag the framework in '/Build/Mac' to my project, it won't build due to the error:

UIKit is not found.

Because the framework carthage copy to '/Build/Mac' is still under '/DerivedData/FlagKit-x/Build/Products/Release-iphoneos/FlagKit.framework'.

Reason
After clone the carthage project, I find #922 causing this issue.
in Xcode.swift:

if let sdk = sdk {
    // Passing in -sdk macosx appears to break implicit dependency
    // resolution (see Carthage/Carthage#347).
    //
    // Since we wouldn't be trying to build this target unless it were
    // for OS X already, just let xcodebuild figure out the SDK on its
    // own.
    if sdk != .MacOSX {
        args += [ "-sdk", sdk.rawValue ]
    }
}

I think it means, when platform is macOS, don't pass '-sdk' arguments, build with projects base sdk, which doesn't works when the project's base sdk isn't macOS.

Solution
I think the codes really should be just like:

if let sdk = sdk {
    args += [ "-sdk", sdk.rawValue ]
}

[ikesyo]

This should not be a Carthage's issue. Looks like the project is not correctly setup as a universal framework target. Just setting SUPPORTED_PLATFORMS is not sufficient and you should set up VALID_ARCHS (Valid Architectures) and TARGETED_DEVICE_FAMILY as well. Please check something like https://github.com/mrackwitz/xcconfigs for correct universal framework settings. Closing.

[aalenliang]

I tried to use the xcconfigs files in this project (https://github.com/SeedLabIO/FlagKit/commits/swift3)
Removed the Carthage/ folder and tried carthage update.

It builds successfully, however, after I drag the framework under /Build/Mac to my project, still build failed due to:

.../Carthage/Build/Mac/FlagKit.framework/Headers/FlagKit-Swift.h:113:9: Module 'UIKit' not found

I thought the copy framework still did something wrong, so I add some log in Xcode.swift

public func copyFileURLsIntoDirectory(directoryURL: NSURL) -> SignalProducer<NSURL, CarthageError> {
    return producer
        .filter { fileURL in fileURL.checkResourceIsReachableAndReturnError(nil) }
        .flatMap(.Merge) { fileURL -> SignalProducer<NSURL, CarthageError> in
            let fileName = fileURL.lastPathComponent!
            let destinationURL = directoryURL.appendingPathComponent(fileName, isDirectory: false)
            let resolvedDestinationURL = destinationURL.URLByResolvingSymlinksInPath!

            print("* fileURL: " + fileURL.absoluteString!)
            print("* resolvedDestinationURL: " + resolvedDestinationURL.absoluteString!)
            return copyProduct(fileURL, resolvedDestinationURL)
        }
}

And run carthage update it logged:

* fileURL: file:///Users/liangalen/Library/Developer/Xcode/DerivedData/
FlagKit-fwwepxalaneinngomftamewytxrp/Build/Products/Release-iphoneos/
A4D3FD88-007B-3160-B07F-2A1569B43300.bcsymbolmap
* resolvedDestinationURL: file:///Users/liangalen/Documents/Projects/SeedLab/
AccessControlExample/Carthage/Build/Mac/A4D3FD88-007B-3160-B07F-2A1569B43300.bcsymbolmap

I think carthage still copy the framework build from /Release-iphonos (the base sdk is iOS 10.0) to Build/Mac, which still an issue.

[ikesyo]

Hmm, so looks like currently SDKROOT should be macosx for a universal framework target. But passing in -sdk flag when building with macOS SDK should be avoided as written in the comment:

// Passing in -sdk macosx appears to break implicit dependency
// resolution (see Carthage/Carthage#347).
//
// Since we wouldn't be trying to build this target unless it were
// for OS X already, just let xcodebuild figure out the SDK on its
// own.

So the following is not the solution:

if let sdk = sdk {
    args += [ "-sdk", sdk.rawValue ]
}

Overriding SDKROOT build setting instead of passing in -sdk flag might be a solution on Carthage side.

[aalenliang]

Thanks for the reply!