Xcode12.0(12A7209) Error: Compile Swift source files

Only certain Test Scheme are getting errors in Swift source files.

The error output to the log with the Compile process message is as follows. I hope someone can fix this build error🤧

Compile Swift source files (x86_64)
Code Block terminal
CompileSwiftSources normal x86_64 com.apple.xcode.tools.swift.compiler (in target 'HogeApiTests' from project 'Hoge')
...
<unknown>:0: error: unable to execute command: Illegal instruction: 4
<unknown>:0: error: compile command failed due to signal 4 (use -v to see invocation)


Compile HomeSpec.swift (x86_64) ※ Most Swift files get this Error
Code Block terminal
CompileSwift normal x86_64 /Users/HogeUser/job/Hoge/HogeApiTests/Entity/HogeSpec.swift (in target 'HogeApiTests' from project 'Hoge')
...
Command CompileSwift failed with a nonzero exit code



Compile Hoge12Spec.swift (x86_64) ※ I get this Error in some Swift files
Code Block terminal
CompileSwift normal x86_64 /Users/HogeUser/job/Hoge/HogeApiTests/Entity/Hoge12Spec.swift (in target 'HogeApiTests' from project 'Hoge')
...
error: Illegal instruction: 4 (in target 'HogeApiTests' from project 'Hoge')






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Yumfishing
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Could it be an optimisation issue ?

Have a look here: https://stackoverflow.com/questions/14268887/what-is-the-illegal-instruction-4-error-and-why-does-mmacosx-version-min-10
Posted by
Claude31
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I'm also getting the same error with Xcode 12.1 when running tests with Quick + Nimble. The compiler seems to have trouble type-checking the tests
Posted by
sylvanash
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Did you fix it? Seeing the same error with Xcode 12.5
Posted by
arise
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Did you fix it? Seeing the same error with Xcode 12.5
Posted by
zhaoqt
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Did you fix it? Seeing the same error with Xcode 12.5
Posted by
Manny2725
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  • Maybe one of your Swift file is too large. I had the same error with Xcode 12.5 and finally I found that there was a large Swift file more than 10000 lines. I refactor the file and the error disappeared. Hope this can help you.

    —
    alex1212112
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Also seeing the same in 12.5

Posted by
G522811
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Did you fix it? Seeing the same error with Xcode 13

Posted by
Computer Lover
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Did you fix it? Seeing the same error with Xcode 13

Posted by
vijayseshadri
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  • Seeing the same error with Xcode 13.1 for Swinject SkeletonView Lottie-ios

    —
    aftab301286
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Follow these steps

#1. Clear de DerivedData folder

  • rm -rf ~/Library/Developer/Xcode/DerivedData

#2. Clean Xcode project

  • cmd + shift + k

#3. Close Xcode project, maybe even reboot the mac (if you like)

Try again. The first step was the crucial step for me, but step 2 and 3 could help as well.

Posted by
Salgado
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