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Xcode 12.2 beta 3 / Big Sur Beta 10 throw SIGCONT for SwiftUI app

I’ve just ‘upgraded’ to the latest Big Sur – 11.0 Beta (20A5395g) – and Xcode betas – 12.2 beta 3 (12B5035g). When I try to run any SwiftUI based Mac App the program stops with a Thread 1: signal SIGCONT message. Sometimes I am able to continue (Ctrl Command Y), but others the program stops with the message Message from debugger: Terminated due to signal 19.

The Stack trace suggests the problem is in the ImageLoader.

I’ve tried reinstalling Xcode and clearing out it’s cache’s. The problem even manifests with a brand new project – i.e. it isn’t related to my code,

Any ideas how I might trouble shoot this?

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Answers


  1. Chosen as BEST ANSWER
    0

    Workaround by choosing "Debug Process as Root" in Schema "Run" -> "Info"

    Apple Forum discussion


  2. 0

    You can workaround the issue using a symbolic breakpoint.

    Add a symbolic breakpoint with the following settings:

    Symbol: _main
    Module: dyld
    Action: Debugger Command with the command process handle -n false -s false SIGCONT
    Options: Check Automatically continue after evaluating actions

    Example symbolic breakpoint

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  3. 0

    I’m on Big Sur beta10 and xcode12 beta1.
    Removing "debug executable" tick in run-debug scheme page fixed it for me.
    You can get there by Product->Scheme->edit scheme…

    Here is a screenshot:

    enter image description here

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