Looking at the GCC command you issued in example 1, it looks like you are
using pieces of the regular qt5 package and also pieces of the qt5-static
package. You should decide which package you want to use and then just
stick to using only that one package. It might be a good idea to uninstall
the other package just so you don't get confused. Specifically, it looks
like you are using the "Qt5Core" include directory from the regular Qt5
package, which would probably define qVersion to a be function imported
from a DLL. But then at link time you are actually linking to the static
version of Qt, which means qVersion would be a function that comes from a
static library, not a DLL.
--David
On Sun, Jul 26, 2020 at 8:07 AM Il'dar Al'Miev <ialm...@yandex.ru> wrote:
> Dear All,
> hello,
>
> Windows 7 (64-bit), Msys2-Mingw64 are installed in my computer.
> i installed Qt using the command,
> pacman -S mingw-w64-x86_64-qt-creator
> and
> pacman -S mingw-w64-x86_64-qt
>
> i am a newbie in Qt programming. i discovered two examples in Internet.
>
> example1.cpp
> ---------------------------------------
> #include <QtCore>
>
> #include <iostream>
>
> int main() {
>
> std::cout << "Qt version: " << qVersion() << std::endl;
>
> }
>
> in order to compile the example1.cpp, i used a command found in Internet,
>
> g++ -o example1.exe example1.cpp -I/C:/msys64/mingw64/include/QtCore
> -I/C:/msys64/mingw64/qt5-static/include/QtCore
> -L/C:/msys64/mingw64/qt5-static/lib -lQt5Core -fPIC
>
> however, compilation comes with an error message,
>
> C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
> C:\msys64\tmp\ccpq7uZL.o:my_qt_program2.cpp:(.text+0x2c): undefined
> reference to `__imp_qVersion'
> collect2.exe: error: ld returned 1 exit status
>
>
>
> may be i have not installed all Qt-packages required in Msys2-Mingw64 ?
>
>
>
> example2.cpp
>
> -----------------------------
>
> #include <QApplication>
> #include <QWidget>
>
> int main(int argc, char *argv[]) {
>
> QApplication app(argc, argv);
>
> QWidget window;
>
> window.resize(250, 150);
> window.setWindowTitle("Simple example");
> window.show();
>
> return app.exec();
>
> }
>
> that file i saved in a separate directory, and as it was recomended in
> Internet i used the following commands,
>
> qmake -project
> qmake
> make
>
>
>
> after that the separate directory "release" was created (inside), where
> the executable "example2.exe" was created. however, when i try to execute
> that file in Mingw64 console, nothing is happened, that is the windows
> "Simple example" does not appear.
>
>
>
> i would appreciate someone(s) in the Forum to explain me, where i made a
> compilation error; or it is associated with Mingw64-Msys2 ?
>
> Thank you.
> _______________________________________________
> Msys2-users mailing list
> Msys2-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/msys2-users
>
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