IOS library crashes in distribution configuration

Development Platform & Builds Mobile
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1

Hi,

I’m currently adding the Android & IOS library to the NNERuntimeORT from ue5-main branch plugin. Android works fine in Development & Release, however IOS only works with non distribution builds, not in distribution builds. I’ve used the following code to include the framework to the plugin:

if (Target.Platform == UnrealTargetPlatform.IOS)
{
	PublicAdditionalFrameworks.Add(new Framework(
		"ONNXRuntime", 
		Path.Combine(PluginDirectory, "Binaries", "ThirdParty", "Onnxruntime", Target.Platform.ToString(), "onnxruntime.xcframework")
	));
}

I’ve tried various versions of onnxruntime: 1.14.0, 1.14.1, 1.19.1. I even tried various download sources: nuget, cocoa, as well as download.onnxruntime.ai. All having the exact same behaviour.

Here is the stack trace:

crash
crash1698×603 230 KB

2

Here is an minimal example project without anything else than the onnxruntime framework for iOS to reproduce the issue.

3

Are you adding the framework correctly? I thought it was supposed to be added as the platform framework specifically not the entire xcframework folder?

4

Hey! :waving_hand:

I’ve implemented a working fix for using libonnxruntime in iOS distribution builds with UE 5.4. It includes:

:white_check_mark: Embedded .xcframework with bForceEmbedded = true
:white_check_mark: FORCE_ANSI_ALLOCATOR=1 to avoid allocator crash
:white_check_mark: Preserved ONNX flags (ORT_NO_EXCEPTIONS, etc.)
:white_check_mark: README with full reproduction and patch steps

:link: Download full working project here: MinimalExample_ONNX_Fixed.zip

Let me know if you’d like help testing or tweaking. Happy to support!