General Issues in using QT creator:

[Kira]

Hello everyone,
Recently while using QT creator came across certain issue would like to know your opinion on the same:
The issue are mainly based on the thread below which have been solved:
https://forum.qt.io/topic/103330/issue-with-the-thread

Issues:

1. Unable to use the debug mode when included a library built in release mode.
   -> I am working on windows 10 platform recently i had to use tensorflow for which only release mode library was available.
   So when i included the library and run my program it debug mode it would give me an error: failed to initialized the gdb.
   Can anybody provide explanation for the issue ?

2. When i used cout and qDebug() together. The cout element used to get printed first than randomly at any instant of time qDebug used to print its log.
   -> I have observed that cout endling with endl gets printed first than the qDebug.
   -> There are certain times for example when i use opencv along with qt to print some logs i needed cout for ex: size of an image.
   -> To print the qt logs for example if i need to get the QList element i used to qDebug(). At that time unordered logs created a lot of confusion.
   Is there any solution for the same ?

3.Some time when i add a file to pro file the and build the program it doesn't gets included
->It often occur so i have to delete build folder and rebuild it for the files to get included.
-> I came across certain forums which said that this was not required but the solution and explanation was not clear.

[KroMignon]

@Kira said in General Issues in using QT creator::

Some time when i add a file to pro file the and build the program it doesn't gets included

Which kind of file did you add c++/h file with SOURCES += or HEADERS += ?
In this case, saving the project file should rerun qmake and so create a new Makefile.
if not, simply right click on project and select Run qmake (or with Build/Run qmake)

[Kira]

@KroMignon : Ohhk sure. Will try :)

[aha_1980]

@Kira said in General Issues in using QT creator::

Unable to use the debug mode when included a library built in release mode.

Under Windows, this is not supported. Debug and release libraries might use different (incompatible) versions of the C runtime which can lead to undefined behavior including crashes. That is the reason why Qt libraries exists as (large) Debug and (small) Release libs on Windows.

Note that this is a general problem, not a Qt or Creator problem.

Regards

[fcarney]

@aha_1980 said in General Issues in using QT creator::

@Kira said in General Issues in using QT creator::

Unable to use the debug mode when included a library built in release mode.

Under Windows, this is not supported. Debug and release libraries might use different (incompatible) versions of the C runtime which can lead to undefined behavior including crashes. That is the reason why Qt libraries exists as (large) Debug and (small) Release libs on Windows.
Note that this is a general problem, not a Qt or Creator problem.

I assume this means statically linked libraries? Or does this apply to dlls as well? At some point a debug program has to access system dlls to run at all.

[aha_1980]

@fcarney said in General Issues in using QT creator::

Or does this apply to dlls as well? At some point a debug program has to access system dlls to run at all.

It does apply to DLLs. I cannot tell you more about this, you can google a bit around or see for example https://bugreports.qt.io/browse/QTCREATORBUG-21821

And as said, it might work, it's just not guaranteed.

System DLLs seems not to apply to this. Maybe system they are not affected because they are not using C++ ? I really cannot tell.

Regards

[fcarney]

@aha_1980 said in General Issues in using QT creator::

It does apply to DLLs.

Dang it. I searched a bit and it comes down to runtime libraries using different representations for objects. I also found this. Thanks for setting us straight.

[Kira]

Thanks everyone for your replies