Cmake qt5_dir

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Cmake qt5_dir

Thanks for your interest in KDAB. The information you share with us will only be used for the purpose originally intended. CMake is a buildsystem generator developed in the open, and widely used for Qt based development. Especially when creating large or complex software, CMake can be more suitable to use than QMake.

The updated documentation for using CMake with Qt 5 is has been reviewed and generated and repeats the relevant information in this blog post. One of the major changes when using CMake with Qt is the result of increased modularity in Qt itself. Whereas when finding Qt 4, with CMake you use. There is likely to be a way in the future to specify the specific modules in one command, but this will not be available with Qt 5.

This is a source-incompatibility in your CMake based buildsystem which will affect porting from Qt 4 to Qt 5.

CMake: Finding Qt 5 the “Right Way”

Luckily though, it is easy to add source compatibility back to the CMake variables and macros using some simple variable mappings.

Building executables with Qt 5 is slightly more complex than with Qt 4. One of the changes to how Qt 5 is built and packaged compared to Qt 4 is that the -reduce-relocations configure option became the default.

The effect of this is that compilations are run with the -Bsymbolic-functions option, which makes function pointer comparison ineffective, unless the -fPIE flag is also supplied when building executables, or -fPIC when building libraries for position independent code.

If Qt is configured manually, it is of course possible to configure with -no-reduce-relocations and avoid the issue, but the default will be a requirement for all third parties to add compiler flags for position independent code.

cmake qt5_dir

This can be done in the normal way with CMake:. Hoewever, the -fPIE flag is really only for executables and should not be used for libraries. Together with some other newer features in CMake, such as automated moc invokationa simple CMake based build system using Qt 5 which is roughly equivalent to a Qt 4 buildsystem will look something like this:. You can see though that there is a lot of repetition in the snippet, and a lot of things to take care of using.

There is even a subtle bug which people who have unit tested their Qt 4 core-only code will know. That is because of some magic in the header files of QtTest.

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The workaround is either careful scoping of targets and directories, or tricky manual manipulation of the definitions or variables controlling how Qt 4 is found. Starting with CMake 2. It can be used with multiple arguments at once for brevitysuch as:. All properties are scoped to the particular target the function is used with, instead of being scoped to the CMakeLists. Looking forward, we expect a similar but more powerful feature to be possible in upstream CMake too, so that you can expect to be able to use a similar function with any CMake package.

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One of the features of CMake that many developers who used it will be familiar with is Find files. The idea is to write a Find file for each dependency your project depends on, or use an existing Find file provided elsewhere. CMake provides a large set of Find files already, and KDE is preparing to make the Find files developed through the years available to all users of CMake.

This file is responsible for finding Qt on your system so that you can invoke:. One of the disadvantages of this file being part of CMake, and not part of Qt, is that the file could get out-of-date. For example, when Qt 4. Support for that module was not complete until CMake 2. That means that if someone wanted to use QtMultimedia, they could either have to wait for and then depend on the new CMake release, or attempt to copy the Find file into their project to work with their existing CMake version.

The copying may not even work if the updated Find file uses features of the newer CMake.

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Behind the scenes, Qt 5 is now found in a slightly different way too.CMake can find and use Qt 4 and Qt 5 libraries. See cmake-packages 7 for more information about CMake packages, and see the Qt cmake manual for your Qt version.

cmake qt5_dir

Qt 4 and Qt 5 may be used together in the same CMake buildsystem :. A CMake target may not link to both Qt 4 and Qt 5. A diagnostic is issued if this is attempted or results from transitive target dependency evaluation.

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 filesystem content generation.

These tools may be automatically invoked by cmake 1 if the appropriate conditions are met. The automatic tool invocation may be used with both Qt 4 and Qt 5. The tools are executed as part of a synthesized custom target generated by CMake. If it is not so included, it will be added to a separate file which is compiled into the target. This means that a library which provides an alternative translation system for Qt may specify options which should be used when running uic :.

The AUTORCC target property controls whether cmake 1 creates rules to execute rcc at the appropriate time on source files which have the suffix. This documents an old version of CMake. Click here to see the latest release. That function is declared in the klocalizedstring. Quick search.

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Created using Sphinx 1.I am not able to install OpenCV 2. Poorly Cmake does not find the QT stuff and I get the following warning:. Could not find a package configuration file provided by "Qt5Gui" with any of the following names:.

I know the correct path to this things, but I do not know how to tell it Cmake. Also with google I found no solution. This guide here solved my problems: Guide. Then add the built binary files path to the system path Asked: How to fix it? Is there a FindOpenCV. First time here? Check out the FAQ! Hi there! Please sign in help. How to set the path to QT5 in cmake? Hello, I am not able to install OpenCV 2. Could not find a package configuration file provided by "Qt5Gui" with any of the following names: Qt5GuiConfig.

How can I add the path to the Qt sources or is there another solution? Thank you very much :. Thank you very much. Your answer gave me the right hint. Qt5 was not installed correct. On Ubuntu it is not enough to use the Qt installer. Here are the steps that worked for me in configuring OpenCV with Qt and Visual Studio: Make sure you download the Qt source from here make sure you download the zip file, in the Qt download page look for: "The source code is available as a zip Start up a Visual Studio Command Prompt Now navigate to the extracted folder and enter inside it by using the console window.

Enter the following command it worked for me fine : configure.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. How can I change this? This folder must contain Qt5Config.

Learn more. Ask Question. Asked 2 years, 4 months ago. Active 1 year, 2 months ago. Viewed 5k times. Stepan Yakovenko Stepan Yakovenko 5, 17 17 gold badges 80 80 silver badges bronze badges.

Active Oldest Votes. Search the PATH environment variable. And in some more "desperate" places. More about that here. With that in mind there are several ways to provide a proper version to QT: Have an environment variable pointing to the proper version of QT e. Then no additional changes to CMake files are required.

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Teivaz Teivaz 4, 4 4 gold badges 24 24 silver badges 57 57 bronze badges. There's a simpler alternative which happens to be the standard approach: set the cmake variables at config time.

For example? Thank you for exactly describing which path to set. I did not know that there are cmake-files hidden somewhere in QT.

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One thing Windows users should be reminded of is restarting the PC after setting environment variables or else they won't take effect. Mar 11 '19 at Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Ben answers his first question on Stack Overflow. The Overflow Bugs vs.CMake is a tool that helps simplify the build process for development projects across different platforms.

CMake automates the generation of buildsystems such as Makefiles and Visual Studio project files. CMake is a 3rd party tool with its own documentation. The rest of this topic details the specifics of how to use Qt 5 with CMake. The minimum version required to use Qt5 is CMake 3.

These libraries and header files can then be used to build libraries and applications based on Qt. This command automatically adds appropriate include directories, compile definitions, the position-independent-code flag, and links to the qtmain. Imported targets are created for each Qt module.

Note however that it is rare to require the full location to the library in CMake code. Most CMake APIs are aware of imported targets and can automatically use them instead of the full path. Imported targets are created with the configurations Qt was configured with.

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That is, if Qt was configured with the -debug switch, an imported target with the configuration DEBUG will be created. If your project has custom CMake build configurations, it may be necessary to set a mapping from your custom configuration to either the debug or release Qt configuration. The name of the imported target for each module matches the name of the module with a prefix of 'Qt', for example QtWidgets. All of the package-specific variables have a consistent name with a prefix of the name of the package.

Note that the variables are case-sensitive. Additionally, several other variables are available which do not relate to a particular package, but to the Qt installation itself.

Documentation contributions included herein are the copyrights of their respective owners.

cmake qt5_dir

Qt and respective logos are trademarks of The Qt Company Ltd. All other trademarks are property of their respective owners. Building with CMake CMake is a tool that helps simplify the build process for development projects across different platforms.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Already on GitHub? Sign in to your account. So this lack of private headers, so compilation also fails. Since those headers for 5. Thank you for pointing out it needs to be cmake folder. It has successfully build. Cashews54 This works because CMake uses lots of heuristics to detect packages cf.

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Jump to bottom.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up.

I'm trying to build sdrangelovewhich wants Qt 5 and uses CMake for its build system, on Ubuntu What package do I need to install to give it the file it's asking for here? All the discussions I've found either have things working fine or are talking about writing CMake build rules rather than executing them. I just stumbled upon this question while trying to compile KeePassX 2.

What helped me was to use apt-file to search for the missing packages:. After an unsuccessful build, I must remove CMakeCache. If you tried the above solutions and it didn't work, also try apt-get install libqt5opengl5-devthat worked for me. This is typically due to improper installation of the phonon4qt5 version 4. Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top. Ask Question. Asked 6 years, 11 months ago. Active 1 year, 8 months ago.

Viewed 73k times. Could not find a package configuration file provided by "Qt5Core" requested version 5. Kevin Reid. Kevin Reid Kevin Reid 1, 2 2 gold badges 9 9 silver badges 15 15 bronze badges. Active Oldest Votes.


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