CppLinkErrorUndefinedReferenceToWtWrun.md

 

 

 

 

 

(C++) undefined reference to 'Wt::WRun(int, char**, Wt::WApplication* (*)(Wt::WEnvironment const&))'

 

Link error

 

• Download the Qt Creator project 'CppLinkErrorUndefinedReferenceToWtWrun' with this error
• Download the Qt Creator project 'CppLinkErrorUndefinedReferenceToWtWrun' with this error fixed

 

 

 

 

 

Full error message

 

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/MyFolder/main.o:: In function 'main': /MyFolder/main.cpp:16: error: undefined reference to 'Wt::WRun(int, char**, Wt::WApplication* (*)(Wt::WEnvironment const&))'

 

 

 

 

 

Technical facts

 

Application type(s)

• Desktop application

Operating system(s) or programming environment(s)

• Ubuntu 10.10 (maverick)

IDE(s):

• Qt Creator 2.0.0

Project type:

• Console application

Compiler(s):

• G++ 4.4.5

Libraries used:

• Wt: version 3.1.2

 

 

 

 

 

Qt project file: CppLinkErrorUndefinedReferenceToWtWrun.pro

 

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#------------------------------------------------- # # Project created by QtCreator 2010-12-29T17:23:02 # #------------------------------------------------- QT       += core QT       -= gui TARGET = CppLinkErrorUndefinedReferenceToWtWrun CONFIG   += console CONFIG   -= app_bundle TEMPLATE = app SOURCES += main.cpp

 

 

 

 

 

main.cpp

 

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//--------------------------------------------------------------------------- #include <Wt/WApplication> //--------------------------------------------------------------------------- struct MyWtClass : public Wt::WApplication {   MyWtClass(const Wt::WEnvironment& env)     : Wt::WApplication(env) {} }; //--------------------------------------------------------------------------- Wt::WApplication * createApplication(const Wt::WEnvironment& env) {   return new MyWtClass(env); } //--------------------------------------------------------------------------- int main(int argc, char **argv) {   return Wt::WRun(argc, argv, &createApplication); } //---------------------------------------------------------------------------

 

 

 

 

 

Solution

 

Add the following line to your Qt project file:

 

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LIBS += -lwt -lwthttp

 

• Download the Qt Creator project 'CppLinkErrorUndefinedReferenceToWtWrun' with this error
• Download the Qt Creator project 'CppLinkErrorUndefinedReferenceToWtWrun' with this error fixed

 

Note that the fixed version results in the misc error stat: No such file or directory. Document root ("") not valid.