LNK2019 in Debug but not in Release
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I installed the latest Qt SDK (Qt 5.0.2). I'm using Qt Creator 2.7 which uses msvc2012 64-bit.
I created a project without UI-File. in MainWindow I only added my self-defined class derived by QWidget.
I used a class (Painting) from a book which teaches Qt. I wanted to try out the paintEvent(QPaintEvent *event) function. When I run it in debug-mode, I get LNK2019 caused by Painting constructor in function MainWindow::MainWindow. I tried to run it in release-mode and the program executed normally without any errors.
Can someone explain why a linker error occures in debug but not in release mode?
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LNK2019 means the linker can't find a library.
You'll need to provide more details about the error. Which library is it trying to find?
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bq. mainwindow.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""public: __cdecl FormationWidget::FormationWidget(class QWidget *)" (??0FormationWidget@@QEAA@PEAVQWidget@@@Z)" in Funktion ""public: __cdecl MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QEAA@PEAVQWidget@@@Z)".
it's german:
"Verweis auf nicht aufgelöstes externes Symbol "
"unresolved external symbol""in Funktion"
"in function"For more information here is my simple code:
formationwidget.cpp
@FormationWidget::FormationWidget(QWidget *parent): QWidget(parent), x(0), y(0), lm(0)
{
resize(400,300);
}@x, y and lm are of type "int"
mainwindow.cpp
@MainWindow::MainWindow(QWidget *parent): QMainWindow(parent)
{
fw = new FormationWidget(this);
}@fw is of type "FormationWidget"
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try to clean and rebuild your project.
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Hmm... very strange. Can you post your .pro file?
Also, open Qt Creator and go to Tools -> Options -> Build & Run -> Kits. What kits do you have? Do the settings look correct? Is there a yellow/red warning icon?
Then, open your project, and click on "Projects" on the left (below "Debug", above "Help). Does the selected kit match your compiler?
