How can I build a Qt6 application for Buildroot ? I tried a lot to build Qt6 for Buildroot but I was unable to built it.
Qt6 support was not added to Buildroot yet. However, an RFC series was posted some time ago. Feel free to try it out, comment on it, or improve it and re-post.
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Im a beginner at Qt, and i write a program that need Core::ActionManager.
Now in QtCreator that i downloaded (5.3.2 Version), there is no Core plugin, just a QtCore that hasn't ActionManager.
I searched everywhere but i couldn't find how install & use Core.
Can someone please tell me how i have to install it?!
Thank you a lot and sorry for my poor english.
As cmannett85 said, Core::ActionManager is part of Qt Creator's own API. It is only relevant when you want to modify Qt Creator itself. It is not relevant if you want to develop an application using the Qt libraries.
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I've got a project using Qt 5.0.2, and my OS is Windows 7 32 bit.
I am working on big project from months and I didn't had any problems with it to now.One of my dialogs, is Print Preview Dialog and the other dialog contains SSN calculation algorithms with line edit. When I put the project on Debug Mode, my Print Preview Dialog works great, I can print everything that I want, but when I start typing something in the SSN line edit, the program total crashes. And reverse, when I put Release Mode, SSN works fine, but when I do click on the "Print" button in the Print Preview Dialog, my program crashes again. Today, I tried to put in some other objects like (buttons, line edits, etc), but the program does not recognize them.For example when I write ui-> ... and I don't get the new objects.
I think that I need to download and install the newest version of Qt (5.1.1), but I don't know, could I change my Project version easy. I am afraid, that nothing will work after this new version install. Please tell me what to do. Should I install the newest version, cause I can't continue my Project.
Qt != Qt Creator. The creator is just the IDE. Qt is the framework you're using. Please don't confuse everyone by using the two terms interchangeably.
It's trivial to build your project for multiple Qt versions, even for Qt 4 and Qt 5. Qt Creator supports an arbitrary number of Qt installations. You can select what you're building for in the Projects pane of Creator. You can then build for whichever kit. Before you do that,
set up the newly downloaded version of Qt in Creator
set up a kit using that Qt version; The kit is a combination of Qt version, compiler, target environment (Desktop in your case), etc.
Most likely you have memory bugs in your program. The usual suspect is double destruction of objects caused by giving an automatic (on-the-stack) QObject/QWidget a parent. You can use Valgrind on Linux to find such issues.
To be sure of what's going on, delete the build directory and rebuild your project.
Qt Creator version is mostly irrelevant in this discussion. Qt 5.1.1 binaries coincidentally come with Qt Creator 2.8.1, that's just for your convenience. It doesn't mean you can only use creator 2.8.1 with Qt 5.1.1. I'm using it with both Qt 4.8 and Qt 5.1.
I am wondering if there is a tool to check a Qt4 project (C++) for backward compatibility with a specific older Qt version. For example, my project uses version 4.8.4 and I would like to run it on 4.5.3.
I am thinking of a compatibility check on the basis of the source code. I would prefer a solution which does not rely on QtCreator (but please name it anyway if any ;)
Thank you for any hint.
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Cross compile in Linux or Windows?
Does this involve the mkspecs?
This may help This is cross-compiling and if I were you I'd simply recompile in Windows to keep things simple.
General advice: keep your source code and build chain as platform-independent as possible. CMake will help you stay honest here.
When on Linux, CMake will generate a Makefile environment.
If you take the exact same source tree into Windows, CMake will generate a Visual Studio project.
You can, but it's not really recommended for the good reasons above. #spraff has actually answered the question with his link, so you need to read up on that, but no it's not really about the mkspecs, it's about having an actual compiler on your machine that creates Windows executable binaries. The mkspecs are there to tell Qt what compiler to use and how to use it, they don't do the actual compilation process.
There is mingw-cross-env.
I have some issues with Qt/Phonon that I think might be related to it being a bit outdated.
NokiaSoft doesn't care much about Qt for desktop, since the Phonon framework shipped with Qt has been untouched for several releases. No update from 4.6.x or 4.7.x has touched it, AFAICT.
So, have anyone attempted to recompile Qt/PyQt using a new(er) Phonon version, and are there any gotchas for this?
To get the latest you can check out official phonon repos here:
https://projects.kde.org/projects/kdesupport/phonon