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I have a .Net Maui app (9.0.14) built in vs2022 (updated to 17.13.4 today) on WIndows 11 Pro, which works fine on local dev machine, in ios simulator, android simulator and windows machine. I'm frustrated that I can't get the app icon to display if I deploy to a local iPhone (it always shows the default purple .Net icon) even though it works fine on the simulators, as I want to demo it to some people. So I try to deploy to iphone connected to paired Mac. The device shows up correctly, but when I build in VS2022 I get the following message:
clang++ exited with code 1: ld: file is empty in '.../Program Files/dotnet/packs/Microsoft.NETCore.App.Runtime.Mono.ios-arm64/9.0.3/runtimes/ios-arm64/native/libmono-component-marshal-ilgen-static.a' clang++: error: linker command failed with exit code 1 (use -v to see invocation)
Can anyone help here? This has been happening ever since I first tried it weeks ago. I've been waiting to see whether any "updates" might fix the problem, so I'm now running Xcode 16.2, Sequoia 15.3.2 etc. However, this failure was occurring on all previous versions
I'm running VS2022 on a Surface PRO with an Intel Core Ultra 7 266V 2.20 GHz processor and Windows 11 Pro. I just spotted the "ios-arm64" part of the "empty file", and am assuming it refers to the target phone device and is not a remnant of the Snapdragon processor I used to use, but got rid of very quickly?
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Now, you are using Xcode 16.2, .NET9, VS202217.3.3, right?
Which iOS device did you test on? Is it an iOS18 iPhone?
Also, what's the linker behavior of your project?
Please try removing the ~/Library/Caches/Xamarin/XMA/SDKs/dotnet/ folder on the Mac and removing the %localappdata%\Temp\Xamarin\XMA folder on your Windows machine. And then re-open VS and re-pair to Mac.
If it still doesn't work, please let me know.
Thank you for your reply, unfortunately this made no difference.
My Linker behaviour is "Don't Link" for Debug & net9.0-ios, and "Link Framework SDKs Only" for Release & net9.0-ios, although I am only in Debug mode at present.
The target device is an iPhone 13 mini.
iOS18.3？ Do you try to set Link all assemblies.? When you create an empty MAUI project and test on iOS simulator, do you have the same issue?
I tried all linker options to no avail. I also tried a basic Hello World application and received exactly the same error when trying to deploy to my phone connected to the paired Mac.
However, I finally read the error message and paid attention to the filenames. Sure enough, the file libmono-component-marshal-ilgen-static.a was showing as Zero Bytes on the Mac, but 199 bytes on my Windows machine. So I manually copied it from the WIndows machine to the appropriate place on the Mac, overwriting the empty file, and it all started working.
While this HAS fixed my problem, it seems like there must be some error in the Maui process, as this doesn't feel like a "normal" dev requirement! Note that I had to copy the file for each app, not just once.
Glad you solved the problem. For this, you could report the problem with VS, see Report a problem with Visual Studio - Visual Studio (Windows) | Microsoft Learn
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For the logo when you deploy from a dev machine rather than from the store/testflight the app is deployed using HotRestart and this deploys an empty shell app which is then filled with your code and app. The issue your seeing is that the shell app has the icon set to the .NET logo. You can read more here https://learn.microsoft.com/en-us/dotnet/maui/ios/hot-restart?view=net-maui-9.0
Thanks for your input. I was vaguely aware of these details, which is why I was attempting to deploy to a device connected via a paired Mac, as this WILL set up the configured icon. I have now "fixed" this problem for the time being, as you will see in my reply to @Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.)