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[SR-10236] Classes that inherit from themselves cause Xcode to max out the CPU #52636

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twostraws opened this issue Mar 29, 2019 · 3 comments
Open

[SR-10236] Classes that inherit from themselves cause Xcode to max out the CPU #52636

twostraws opened this issue Mar 29, 2019 · 3 comments
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@benlangmuir
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@twostraws
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Previous ID SR-10236
Radar rdar://49434989
Original Reporter @twostraws
Type Bug
Environment

Xcode 10.2 on macOS 10.14.4.

Additional Detail from JIRA
Votes 1
Component/s Compiler
Labels Bug
Assignee @benlangmuir
Priority Medium

md5: e0e61270faebdea5437012736e153c79

Issue Description:

Code like this is causing issues when compiled using Xcode:

class A: B { }
class B: A { }

When run through swiftc on the command line it errors out immediately, saying "A inherits from itself", but in Xcode the Swift compiler carries on running in the background. As far as I can see, the background Swift compilation continues to sit at 100% until killed.

I tested this in a new macOS terminal project with no other code, and also an iOS Single View App template project.
@benlangmuir
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Reproduces when indexing-while-building is enabled.

$ swiftc -typecheck t.swift // OK
$ swiftc -typecheck t.swift -index-store-path /tmp/index // HANG

@benlangmuir
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#23674

@benlangmuir
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5.0: #23680
5.1: #23681

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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@benlangmuir benlangmuir

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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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@twostraws @benlangmuir