5 error messages when compiling in QT

[ShovelHand]

I am running windows and have tried Visual Studio and QT Creator. Visual Studio worked great, but QT gave me a few warnings about only initializing non-static members with c++11, and the five following errors.:
main.cpp:-1: error: undefined reference to cv::Mat::operator=(cv::Scalar_<double> const&)' main.cpp:-1: error: undefined reference tocv::fastFree(void*)'
👎 error: CMakeFiles\raytrace.dir/objects.a(main.cpp.obj): bad reloc address 0x2d in section `.text$_ZN2cv3MatD1Ev[__ZN2cv3MatD1Ev]'
👎 error: final link failed: Invalid operation
collect2.exe:-1: error: error: ld returned 1 exit status
I am using QT 3.5.0 based on QT 5.5.0 and using MSVC 2013, 32 bit as my compiler. Not sure what I'm doing wrong, or if this problem is unique to me. I wouldn't sweat it since it worked for Visual Studio, but I'd love to be able to use QT's helpful widget design stuff in the future.
*edit: it does look like the link you provided for the installer is a different one than I used. I'll try installing the one you linked to and see if that works better,

[marovira]

@ShovelHand
I cannot reproduce the error on my machine using your current setup (Qt Creator 3.5.0 based on Qt 5.5.0 and MSVC 2013). When you first opened the CMakeLists file in Qt Creator, did you use the NMake generator? Or something else? Also, what version of Windows are you using?

[ShovelHand]

I believe I used CMake following QT's prompting, but I may be mistaken. I am using windows 10. Tomorrow I will see if I can reproduce the problem. It's probably some silly thing I've done wrong on my end.

[luckysama]

Hi @ShovelHand ,

We have office hours from 11am - noon tomorrow.
Please bring your laptop with you to the lab (ECS330) if you have time.

I am personally strongly against you using the Qt library. Please restrict your code to purely OpenGL+OpenCV if possible, Qt is very unstable, and its backward compatibility is terrible (e.g., if Qt updates then nothing works) If you are determined to write a GUI on windows, just use Microsoft libraries, such as WPF.

The reason we use Qt Creator is only because it's a cross-platform GUI, and it saves all the effort of communicating with CMAKE on the command line.

[ShovelHand]

Hi, Lucky.
My ray tracing project is going swimmingly, and I'm going to stay home to
press the advantage while my wife is also here to look after our son.
You've convinced me that QT is for suckers.

On Wed, Sep 16, 2015 at 5:28 PM, luckysama notifications@github.com wrote:

Hi @ShovelHand https://github.com/ShovelHand ,

We have office hours from 11am - noon tomorrow.
Please bring your laptop with you to the lab (ECS330) if you have time.

I am personally strongly against you using the Qt library. Please
restrict your code to purely OpenGL+OpenCV if possible, Qt is very
unstable, and its backward compatibility is terrible (e.g., if Qt updates
then nothing works) If you are determined to write a GUI on windows, just
use Microsoft libraries, such as WPF.

The reason we use Qt Creator is only because it's a cross-platform GUI,
and it saves all the effort of communication with CMAKE on command line.

—
Reply to this email directly or view it on GitHub
#2 (comment).

[taiya]

Hi Alex, I am glad to hear that. I strongly agree with Lucky. Qt is only really necessary for larger applications (e.g. a large UI interface). It introduces a lot of complexity and overhead which is unnecessary for this course!