[Interest] Strange unresolved external symbols in QtCore on windows

[Patrick Stinson]

My qmake-generated Visual studio project is complaining about the following QObject symbols referenced from my QObject subclass even though I am linking to Qt5Core.lib using a qt I built from the command line:


1>CUtil.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::timerEvent(class QTimerEvent *)" (?timerEvent at QObject@@UAEXPAVQTimerEvent@@@Z)
1>CUtil_win32.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::timerEvent(class QTimerEvent *)" (?timerEvent at QObject@@UAEXPAVQTimerEvent@@@Z)
1>sip_cutilAppFilter.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::timerEvent(class QTimerEvent *)" (?timerEvent at QObject@@UAEXPAVQTimerEvent@@@Z)
1>CUtil.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::childEvent(class QChildEvent *)" (?childEvent at QObject@@UAEXPAVQChildEvent@@@Z)
1>CUtil_win32.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::childEvent(class QChildEvent *)" (?childEvent at QObject@@UAEXPAVQChildEvent@@@Z)
1>sip_cutilAppFilter.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::childEvent(class QChildEvent *)" (?childEvent at QObject@@UAEXPAVQChildEvent@@@Z)
1>CUtil.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::customEvent(class QEvent *)" (?customEvent at QObject@@UAEXPAVQEvent@@@Z)
1>CUtil_win32.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::customEvent(class QEvent *)" (?customEvent at QObject@@UAEXPAVQEvent@@@Z)
1>sip_cutilAppFilter.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::customEvent(class QEvent *)" (?customEvent at QObject@@UAEXPAVQEvent@@@Z)
1>CUtil.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::connectNotify(class QMetaMethod const &)" (?connectNotify at QObject@@UAEXABVQMetaMethod@@@Z)
1>CUtil_win32.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::connectNotify(class QMetaMethod const &)" (?connectNotify at QObject@@UAEXABVQMetaMethod@@@Z)
1>sip_cutilAppFilter.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::connectNotify(class QMetaMethod const &)" (?connectNotify at QObject@@UAEXABVQMetaMethod@@@Z)
1>CUtil.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::disconnectNotify(class QMetaMethod const &)" (?disconnectNotify at QObject@@UAEXABVQMetaMethod@@@Z)
1>CUtil_win32.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::disconnectNotify(class QMetaMethod const &)" (?disconnectNotify at QObject@@UAEXABVQMetaMethod@@@Z)
1>sip_cutilAppFilter.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall QObject::disconnectNotify(class QMetaMethod const &)" (?disconnectNotify at QObject@@UAEXABVQMetaMethod@@@Z)


The output of dumpbin /symbols /linenumbers Qt5Core.lib shows these symbols as protected, not public as referenced above


516 00000000 UNDEF  notype ()    External     | ?timerEvent at QObject@@MAEXPAVQTimerEvent@@@Z (protected: virtual void __thiscall QObject::timerEvent(class QTimerEvent *))
517 00000000 UNDEF  notype ()    External     | ?childEvent at QObject@@MAEXPAVQChildEvent@@@Z (protected: virtual void __thiscall QObject::childEvent(class QChildEvent *))


But then, maybe the public/private status of these isn’t the problem.

Anyone have any idea what might be causing this? Here is my linker command line:


OUT:"release\\Family Diagram.exe" /MANIFEST /NXCOMPAT /PDB:"release\Family Diagram.pdb" /DYNAMICBASE "Y:\dev\vendor\sysroot-win-32\qt\lib\qtmain.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\Qt.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\QtCore.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\QtGui.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\QtLocation.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\QtNetwork.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\QtPositioning.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\QtPrintSupport.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\QtPurchasing.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\QtQml.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\QtQuick.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\QtQuickWidgets.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\QtWidgets.lib" "Y:\dev\vendor\sysroot-win-32\lib\python36.lib" "Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5\sip.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\printsupport\windowsprintersupport.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\styles\qwindowsvistastyle.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\geoservices\qtgeoservices_esri.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\geoservices\qtgeoservices_itemsoverlay.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\geoservices\qtgeoservices_mapbox.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\geoservices\qtgeoservices_nokia.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\geoservices\qtgeoservices_osm.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5Concurrent.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\scenegraph\qsgd3d12backend.lib" "dxgi.lib" "d3d12.lib" "d3dcompiler.lib" "dcomp.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\platforms\qwindows.lib" "imm32.lib" "oleaut32.lib" "shlwapi.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5EventDispatcherSupport.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5FontDatabaseSupport.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\qtfreetype.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5ThemeSupport.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5AccessibilitySupport.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5WindowsUIAutomationSupport.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\imageformats\qgif.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\imageformats\qico.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\imageformats\qjpeg.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\qmltooling\qmldbg_debugger.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\qmltooling\qmldbg_inspector.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\qmltooling\qmldbg_local.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\qmltooling\qmldbg_messages.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\qmltooling\qmldbg_native.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\qmltooling\qmldbg_nativedebugger.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\qmltooling\qmldbg_profiler.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\qmltooling\qmldbg_quickprofiler.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\qmltooling\qmldbg_server.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5PacketProtocol.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\qmltooling\qmldbg_tcp.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\bearer\qgenericbearer.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\position\qtposition_geoclue.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5DBus.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\position\qtposition_positionpoll.lib" "Y:\dev\vendor\sysroot-win-32\qt\plugins\position\qtposition_winrt.lib" "runtimeobject.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5PrintSupport.lib" "winspool.lib" "comdlg32.lib" "gdi32.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5QuickWidgets.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5Widgets.lib" "uxtheme.lib" "dwmapi.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5Location.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5PositioningQuick.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5Purchasing.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5Positioning.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\clip2tri.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\poly2tri.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\clipper.lib" "Y:\dev\vendor\sysroot-win-32\qt\qml\QtQuick.2\qtquick2plugin.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5Quick.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5Gui.lib" "libEGL.lib" "libGLESv2.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\qtlibpng.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\qtharfbuzz.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5Qml.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5Network.lib" "dnsapi.lib" "iphlpapi.lib" "crypt32.lib" "Y:\dev\vendor\sysroot-win-32\lib\libssl.lib" "Y:\dev\vendor\sysroot-win-32\lib\libcrypto.lib" "Gdi32.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\Qt5Core.lib" "mpr.lib" "netapi32.lib" "userenv.lib" "version.lib" "ws2_32.lib" "kernel32.lib" "user32.lib" "shell32.lib" "uuid.lib" "ole32.lib" "advapi32.lib" "winmm.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\qtpcre2.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\libEGL.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\libGLESv2.lib" "d3d9.lib" "dxguid.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\translator.lib" "Y:\dev\vendor\sysroot-win-32\qt\lib\preprocessor.lib" "odbc32.lib" "odbccp32.lib" /MACHINE:X86 /SAFESEH /INCREMENTAL:NO /PGD:"release\Family Diagram.pgd" /SUBSYSTEM:WINDOWS /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"release\Family Diagram.exe.intermediate.manifest" /ERRORREPORT:PROMPT /NOLOGO /LIBPATH:"Y:\dev\vendor\sysroot-win-32\qt\lib" /LIBPATH:"Y:\dev\vendor\sysroot-win-32\lib" /LIBPATH:"Y:\dev\vendor\sysroot-win-32\lib\python3.6\site-packages\PyQt5" /LIBPATH:"Y:\dev\vendor\sysroot-win-32\qt\plugins\printsupport" /LIBPATH:"Y:\dev\vendor\sysroot-win-32\qt\plugins\styles" /LIBPATH:"Y:\dev\vendor\sysroot-win-32\qt\plugins\geoservices" /LIBPATH:"Y:\dev\vendor\sysroot-win-32\qt\plugins\scenegraph" /LIBPATH:"Y:\dev\vendor\sysroot-win-32\qt\plugins\platforms" /LIBPATH:"Y:\dev\vendor\sysroot-win-32\qt\plugins\imageformats" /LIBPATH:"Y:\dev\vendor\sysroot-win-32\qt\plugins\qmltooling" /LIBPATH:"Y:\dev\vendor\sysroot-win-32\qt\plugins\bearer" /LIBPATH:"Y:\dev\vendor\sysroot-win-32\qt\plugins\position" /LIBPATH:"Y:\dev\vendor\sysroot-win-32\qt\qml\QtQuick.2" /TLBID:1 

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