title: Qt Creator fails to start debugging on Mac
body: <p>Recently (I suspect some system/homebrew update) the Qt's debugger stopped working. It hangs forever on <code>Setting up inferior...</code></p>
  
  <p>The internal log: </p>
  
  <pre><code>dStart parameters: 'QGIS' mode: 1
  dABI: x86-darwin-generic-mach_o-64bit
  dLanguages: c++ 
  dExecutable: ./QGIS 
  dDirectory: ./build/output/bin/QGIS.app/Contents/MacOS
  dDebugger: /Library/Developer/CommandLineTools/usr/bin/lldb
  dProject: ./QGIS
  dAdditional Search Directories:
  dSysroot: 
  dDebug Source Location: 
  dDebugger settings:
  dAdditionalArguments:   (default: )
  dAdjustBreakpointLocations: true  (default: true)
  dAllPluginBreakpoints: true  (default: true)
  dAlwaysAdjustColumnWidths: true  (default: true)
  dAutoDerefPointers: true  (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: false  (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: false  (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: /Library/Developer/CommandLineTools/usr/bin/lldb
   Setting up inferior...
  &lt;1loadDumpers({"token":1})
  &lt;2setupInferior({"attachpid":0,"breakonmain":0,&lt;environment suppressed&gt;,"executable":"/Users/peter/Projects/qgis3/build-QGIS-Qt_5_12_3_5_12_3-Debug/output/bin/QGIS.app/Contents/MacOS/QGIS","nativemixed":0,"platform":"","processargs":"","remotechannel":"","startmode":1,"sysroot":"","token":2,"useterminal":0,"workingdirectory":"./output/bin/QGIS.app/Contents/MacOS"})
  
  eERROR: Lldb stderr: error: there is no embedded script interpreter in this mode.
  eerror: there is no embedded script interpreter in this mode.
  eERROR: Lldb stderr: error: there is no embedded script interpreter in this mode.
  eerror: there is no embedded script interpreter in this mode.
  
  &gt;(lldb) script sys.path.insert(1, '/Applications/Qt Creator.app/Contents/Resources/debugger/')
  &gt;(lldb) script from lldbbridge import *
  &gt;(lldb) script theDumper.loadDumpers({"token":1})
  &gt;(lldb) script theDumper.setupInferior({"attachpid":0,"breakonmain":0,"environment":["4170706c655f5075625375625f536f636b65745f52656e6465723d2f707269766174652f746d702f636f6d2e6170706c652e6c61756e6368642e523977366371596a6d642f52656e646572","434c49434f4c4f523d31","444953504c41593d2f707269766174652f746d702f636f6d2e6170706c652e6c61756e6368642e734648496356415574732f6f72672e6d61636f73666f7267652e7871756172747a3a30","484f4d453d2f55736572732f7065746572","484f4d45425245575f43433d636c616e67","484f4d45425245575f4358583d636c616e672b2b","484f4d45425245575f4e4f5f4155544f5f5550444154453d31","4c414e473d656e5f55532e5554462d38","4c435f414c4c3d656e5f55532e5554462d38","4c435f43545950453d5554462d38","4c4f474e414d453d7065746572","4f4c445057443d2f55736572732f70657465722f50726f6a656374732f71676973332f51474953","504154483d2f7573722f6c6f63616c2f7362696e3a2f7573722f6c6f63616c2f62696e3a2f7573722f62696e3a2f62696e3a2f7573722f7362696e3a2f7362696e3a2f4c6962726172792f5465582f74657862696e3a2f6f70742f5831312f62696e","5053313d5c5b5c655b33326d5c5d5c755c5b5c655b6d5c5d5c5b5c655b33326d5c5d405c5b5c655b6d5c5d5c5b5c655b33326d5c5d5c685c5b5c655b6d5c5d3a5c5b5c655b33346d5c5d5c775c5b5c655b6d5c5d5c2420","51544449523d2f7573722f6c6f63616c2f43656c6c61722f71742f352e31322e33","534543555249545953455353494f4e49443d3138366138","5348454c4c3d2f62696e2f62617368","53484c564c3d31","5353485f415554485f534f434b3d2f707269766174652f746d702f636f6d2e6170706c652e6c61756e6368642e7836626d74703371524a2f4c697374656e657273","5445524d3d787465726d2d323536636f6c6f72","5445524d5f50524f4752414d3d4170706c655f5465726d696e616c","5445524d5f50524f4752414d5f56455253494f4e3d3432312e32","5445524d5f53455353494f4e5f49443d34434644433031342d393731392d344437442d394132382d344637413739354235453632","544d504449523d2f7661722f666f6c646572732f395f2f316e747a31736778317167666c6b32707973686e74726d7230303030676e2f542f","555345523d7065746572","5850435f464c4147533d307830","5850435f534552564943455f4e414d453d6f72672e71742d70726f6a6563742e717463726561746f722e3435343736","5f3d2f7573722f62696e2f6f70656e","5f5f43465f555345525f544558545f454e434f44494e473d30783146353a3078303a307830"],"executable":"/Users/peter/Projects/qgis3/build-QGIS-Qt_5_12_3_5_12_3-Debug/output/bin/QGIS.app/Contents/MacOS/QGIS","nativemixed":0,"platform":"","processargs":"","remotechannel":"","startmode":1,"sysroot":"","token":2,"useterminal":0,"workingdirectory":"/Users/peter/Projects/qgis3/build-QGIS-Qt_5_12_3_5_12_3-Debug/output/bin/QGIS.app/Contents/MacOS"})
  </code></pre>
  
  <p>the relevant error is probably: </p>
  
  <p><code>ERROR: Lldb stderr: error: there is no embedded script interpreter in this mode.</code></p>
  
  <p>I have lldb-1100.0.25.3, MacOS 10.14.5, Qt Creator 4.9.0 (Based on Qt 5.12.2 (Clang 10.0 (Apple), 64 bit))</p>