'Unsupported Swift architecture' error when compiling for simulator

[AlexIzh]

Describe the bug
I have build the framework by using scripts/buildPrebidMobile.sh script and now trying to integrate XCPrebidMobile.xcframework into current iOS application. When doing that I'm getting Unsupported Swift architecture for PrebidMobile-Swift.h file when trying to run an app in iOS simulator. It works fine for real device though.

To Reproduce
Steps to reproduce the behavior:

1. Build the framework by using scripts/buildPrebidMobile.sh
2. Add XCPrebidMobile.xcframework to iOS project
3. Build for iOS simulator
4. See error

Expected behavior
The framework could be integrated and used as for real devices so and for simulators for testing purposes.

Desktop (please complete the following information):

• OS: MacOS Version 14.4 (23E214
• Xcode: 15.4
• Sim Version: 17.4

Additional context
I'm running it on M1 laptop, if I change scripts/buildPrebidMobile.sh to -arch arm64 for iphonesimulator then it works fine. But it's not going to work if a few developers work on the same project with different machines or if CI is running on Intel chip

[jsligh]

@AlexIzh this seems to be a xCode related issue and not a Prebid one.

[YuriyVelichkoPI]

I wouldn't close this issue. From time to time, we face requests that buildPrebidMobile.sh doesn't work in some circumstances. Since it is part of the repository, we should fix or delete it. I vote for fixing, especially considering that we are going to support SPM, and this script will actually build the framework for future publishing.

[dcaunt]

I'm not an expert with XCFrameworks, but I had the same issue and figured out how to build:

At present, the script builds two directories within XCPrebidMobile.xcframework, ios-arm64 and ios-x86_64-simulator. By removing the explicit arch argument passed to xcodebuild:

prebid-mobile-ios/scripts/buildPrebidMobile.sh

Line 81 in 44e59f0

-arch x86_64 \

it will produce a folder ios-arm64_x86_64-simulator, and the Info.plist lists both arm64 and x86_64 under SupportedArchitectures.