Additionally, this is what we were able to achieve concensus on, which allowed the introduction of a catch-all solution in the future. We have to rename the correct method. Fixing up includes One of the major internal infrastructural changes in Qt 5 compared to Qt 4 is the splitting of widgets from the QtGui module into a new QtWidgets module. Earlier versions provide less information to the code model, which will then fail to resolve includes and defines. This obviously will require buildsystem changes at least, but also causes the need for downstreams to add includes for headers which were not needed before, as those includes were removed from headers which now remain in the QtGui module. With Qt, code can be reused efficiently to target multiple platforms with one code base.
To switch back to qt5 just install qt5-default. You still need to list the required modules in only one place in the code. Was it just not brought up, or was it not suitable in some way for Qt porting? I wanted a release build to hide the console but all other builds to show it. Edit: Upon further experimenting, I did have qmake installed, but the 4. Now when I try to install both qt5-qmake qt4-qmake I get in some unresolvable dependency conflicts.
Pre-porting As part of a porting strategy, it makes sense to be able to compile code with both the old and new Qt. If a macro from is found in a header file, moc will be run on the file. There are several solutions to this. Those ifdefs are then easier to remove with a perl, sed or python script at the end of the porting process. Qt::escape is still there in Qt 5, but deprecated, so it should be ported away from at some point. I work on build systems a fair bit, and this is something I thought others might benefit from.
Sometimes that involves reading a book or investigating a new technology, or writing some new interesting tooling, as was the. Additional moc dependency file names can be extracted from source code by using. Beyond that, I think a more suitable place to have this discussion would be the kde-buildsystem or Qt development mailing list. Edit: As for the qmake problem, this is fixed by sudo apt-get install qt5-default 1 Where is your qtchooser configuration file? In Qt 4 the macro , and in This poses an obvious portability problem. The comment about removing the module names from your include lines still applies though if you expect to migrate to Qt5 easily.
Behind the scenes, Qt 5 is now found in a slightly different way too. While , I initially wrote some sed scripts to assist with porting, but then started investigating semantic tooling to help with the task. This is a difficult problem to automate because of all of the implicit conversions that happen. When I am trying to build and I am getting the following error in Cmake. Please give me solution with solved. Functions can also be renamed by not specifying the -rename-class argument. Hi Pau, There are two solutions to that issue.
Please help me with header define script solved qt 5. Qt Creator master is compiled using Qt 4 and Qt 5; you can refer to its sources to get an overview of what is required to port an application and keep the sources backwards compatible to Qt 4. The advantage of the new system is that it allows Qt to query the metadata for the plugin without actually dlopen'ing it. In this article i describe base functionality, that usualy used to build simple project. Anyway, were from Qt 4; it is replaced by in Qt 5.
Like the removal of the use of Qt3Support, the clean-up of includes can largely be done on a Qt 4 codebase before porting. Whereas Qt 4 based code might use include This must be updated to either include Or more portably Which works in Qt 4 and Qt 5 : include A small script can be used to make changes like this in bulk. That function is declared in the klocalizedstring. Porting away from deprecated methods Deprecated methods are methods which still exist in Qt 5, but which are obsolete or replaced with a more suitable alternative. A diagnostic is issued if this is attempted or results from transitive target dependency evaluation. Another option is to enable compiler warnings to find the issue.
Building executables with Qt 5 is slightly more complex than with Qt 4. Qt relies on some bundled tools for code generation, such as moc for meta-object code generation, uic for widget layout and population, and rcc for virtual file system content generation. A much more complete list of porting relevant changes will be part of the Qt 5 release notes. Hi; I'm trying to use the cmake because when I try to compile using the libs for mingw which comes with opencv my application to show an image it runs without problems but the image is not displayed. Porting to Qt 5 should be much faster.
This article show you to use cmake with Qt4. There does not seem to be much else that would stop it building with Qt5 after you add the widgets module to the build. The variable may be populated to pre-set the options for all following targets. Plugin loading Another significant porting burden, in plugin-heavy systems at least is that the user code required for plugin loading has changed. Do I need any additional repositories? The Qt 4 and 5 targets for the QtGui libraries specify that the qtmain. This must be consistent with the target property content of the depender target.