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I am compiling my Qt project using compiler MSVC2008, and I am getting linker errors like-

_class_name.obj_:error LNK2001: unresolved external symbol "public: static struct QMetaObject...."... referenced in a function "_function_name_"

_class_name.obj_:error LNK2019: unresolved external symbol "public: static struct QMetaObject..." ... referenced in a function "_function_name_"

I have few basic queries-

  1. what does it mean by errors LNK2001 and LNK2019?

  2. Why these error occurs?

  3. How to resolve these?

NOTE: I am using QtCreater so build system uses qmake and compiler used is MSVC2008.

Anwar Shaikh
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2 Answers2

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  1. In a nutshell, you used a function which is declared but not defined.

  2. It should be caused by your classes using Qt functionality (like signal-slots) but incorrectly.

  3. Here's possibilities I can think of:

    3-a. Double check you've written "Q_OBJECT" at the beginning of your class that use Qt functionality.

    3-b. You call "moc" property, i.e. check if your Qt Visual Studio plugin is installed and enabled.

lukes
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  • I do not see the OP mentioning Visual Studio... It is possible that QtCreator is used for this... – László Papp Jan 13 '14 at 20:59
  • True, the OP said "compiler MSVC2008". I thought it was just "MSVC2008". Another possibility is that he's using cc.exe directly. – lukes Jan 14 '14 at 00:18
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You've included the wrong/too little files or forgot to add .lib files to the Linker in msvc.

Check under linker's Additional Dependencies property for: QtCore5.lib - for Qt5 Release QtCore5d.lib - for Qt5 Debug

QMetaObject is included in one of those, but they might not be the only dependencies in your project.

makciook
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