Debugger fails to start lldb with XCode 11.0

When using the version of LLDB that ships with XCode 11.0, QtCreator fails to start the debugger. It appears to hang with the message "Setting up inferior...". Using the LLDB from an earlier version, XCode 9.4.1, still works, so this appears to be something that changed between those two versions of XCode.

 

I'm getting an error message at the moment when I try to attach a file to this bug report, so I'm copying and pasting the contents of my debug log below. Sorry in advance for the wall of text!

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dStart parameters: 'Raytracer2' mode: 1

dABI: x86-darwin-generic-mach_o-64bit

dLanguages: c++

dExecutable: /Users/vilya/Code/Raytracer/build-debug/Raytracer

dDirectory: /Users/vilya/Code/Raytracer/build-debug

dDebugger: /Applications/Xcode.app/Contents/Developer/usr/bin/lldb

dProject: /Users/vilya/Code/Raytracer

dAdditional Search Directories:

dSysroot:

dDebug Source Location:

dDebugger settings:

dAdditionalArguments: (default: )

dAdjustBreakpointLocations: true (default: true)

dAllPluginBreakpoints: true (default: true)

dAlwaysAdjustColumnWidths: true (default: true)

dAutoDerefPointers: false (default: true) ***

dAutoEnrichParameters: true (default: true)

dAutoQuit: false (default: false)

dBreakEvent: (default: )

dBreakOnAbort: false (default: false)

dBreakOnCatch: false (default: false)

dBreakOnCrtDbgReport: false (default: false)

dBreakOnFatal: false (default: false)

dBreakOnThrow: false (default: false)

dBreakOnWarning: false (default: false)

dBreakpointCorrection: true (default: true)

dBreakpointsFullPath: false (default: false)

dCDB_Console: false (default: false)

dCloseBuffersOnExit: false (default: false)

dCloseMemoryBuffersOnExit: true (default: true)

dDisplayStringLimit: 100 (default: 100)

dEnableReverseDebugging: false (default: false)

dExtraDumperFile: (default: )

dFirstChanceExceptionTaskEntry: true (default: true)

dFontSizeFollowsEditor: true (default: false) ***

dGdbCustomDumperCommands: (default: )

dGdbPostAttachCommands: (default: )

dGdbStartupCommands: (default: )

dIdentifyDebugInfoPackages: false (default: false)

dIgnoreFirstChanceAccessViolation: false (default: false)

dIntelFlavor: false (default: false)

dLoadGdbDumpers2: false (default: false)

dLoadGdbInit: true (default: true)

dLogTimeStamps: false (default: false)

dMaximalStackDepth: 20 (default: 20)

dMaximalStringLength: 10000 (default: 10000)

dMultiInferior: false (default: false)

dNoPluginBreakpoints: false (default: false)

dQmlInspector.ShowAppOnTop: false (default: false)

dRaiseOnInterrupt: true (default: true)

dSecondChanceExceptionTaskEntry: true (default: true)

dSelectedPluginBreakpoints: false (default: false)

dSelectedPluginBreakpointsPattern: .* (default: .*)

dShowQObjectNames2: true (default: true)

dShowQmlObjectTree: true (default: true)

dShowQtNamespace: true (default: true)

dShowStandardNamespace: true (default: true)

dShowThreadNames: false (default: false)

dSkipKnownFrames: false (default: false)

dSortStructMembers: true (default: true)

dSourcePaths: (default: )

dStationaryEditorWhileStepping: false (default: false)

dSwitchModeOnExit: false (default: false)

dSymbolPaths: (default: )

dTargetAsync: false (default: false)

dUseAddressInBreakpointsView: false (default: false)

dUseAddressInStackView: false (default: false)

dUseAlternatingRowColours: true (default: false) ***

dUseCodeModel: true (default: true)

dUseDebuggingHelper: true (default: true)

dUseDynamicType: true (default: true)

dUseMessageBoxForSignals: true (default: true)

dUsePythonDumper: true (default: true)

dUseToolTips: true (default: true)

dUseToolTipsInBreakpointsView: false (default: false)

dUseToolTipsInLocalsView: false (default: false)

dUseToolTipsInStackView: true (default: true)

dWarnOnReleaseBuilds: true (default: true)

dWatchdogTimeout: 20 (default: 20)

dState changed from DebuggerNotReady(0) to EngineSetupRequested(1)

dCALL: SETUP ENGINE

dSTARTING LLDB: /Applications/Xcode.app/Contents/Developer/usr/bin/lldb

eERROR: Lldb stderr: error: module importing failed: invalid pathname

Setting up inferior...

<15loadDumpers({"token":15})

<16setupInferior({"attachpid":0,"breakonmain":0,<environment suppressed>,"executable":"/Users/vilya/Code/Raytracer/build-debug/Raytracer","nativemixed":0,"platform":"","processargs":"","remotechannel":"","startmode":1,"sysroot":"","token":16,"useterminal":0,"workingdirectory":"/Users/vilya/Code/Raytracer/build-debug"})

>(lldb) script sys.path.insert(1, '/Users/vilya/Qt/Qt Creator.app/Contents/Resources/debugger/')

>(lldb) script from lldbbridge import *

>Traceback (most recent call last):

> File "<input>", line 1, in <module>

> File "/Users/vilya/Qt/Qt Creator.app/Contents/Resources/debugger/lldbbridge.py", line 1912

> print message

> ^

>SyntaxError: Missing parentheses in call to 'print'. Did you mean print(message)?

>(lldb) script theDumper.loadDumpers({"token":15})

>Traceback (most recent call last):

> File "<input>", line 1, in <module>

>NameError: name 'theDumper' is not defined

>(lldb) script theDumper.setupInferior({"attachpid":0,"breakonmain":0,"environment":["4170706c655f5075625375625f536f636b65745f52656e6465723d2f707269766174652f746d702f636f6d2e6170706c652e6c61756e6368642e386471374c6e316f37792f52656e646572","484f4d453d2f55736572732f76696c7961","4c4f474e414d453d76696c7961","504154483d2f7573722f62696e3a2f62696e3a2f7573722f7362696e3a2f7362696e","51544449523d2f55736572732f76696c79612f51742f352e31322e302f636c616e675f3634","5348454c4c3d2f62696e2f62617368","5353485f415554485f534f434b3d2f707269766174652f746d702f636f6d2e6170706c652e6c61756e6368642e546c4873577a5966614f2f4c697374656e657273","544d504449523d2f7661722f666f6c646572732f76792f7079745f7a6478733637765f6863663771766e3173766d77303030307a742f542f","555345523d76696c7961","5850435f464c4147533d307830","5850435f534552564943455f4e414d453d6f72672e71742d70726f6a6563742e717463726561746f722e3537303634","5f5f43465f555345525f544558545f454e434f44494e473d30783346413a3078303a307832"],"executable":"/Users/vilya/Code/Raytracer/build-debug/Raytracer","nativemixed":0,"platform":"","processargs":"","remotechannel":"","startmode":1,"sysroot":"","token":16,"useterminal":0,"workingdirectory":"/Users/vilya/Code/Raytracer/build-debug"})

>Traceback (most recent call last):

> File "<input>", line 1, in <module>

>NameError: name 'theDumper' is not defined