On Windows, the pre-built environments from qt. This means that your Qt application dynamically references the Qt DLL's which are installed with the pre-built environment. This is probably the preferred environment for developing and debugging since everything is there and ready to use. However, when it comes to deploying an application on systems without pre-installed Qt environments, it becomes complicated. So, when the application is ready to deploy, it is easier to build a static version of it.

But building a static version of the application requires a static version of the Qt environment in addition to the pre-built dynamic Qt environment. This article describes an automated way of downloading, building and installing a static Qt development environment using a Windows PowerShell script. Note that building and installing a static version of Qt on Windows was somewhat problematic up to Qt 4.

But Qt 5 has now a much better support for static builds on Windows and this article takes advantage of that. The two environments are incompatible and cannot be mixed. You have to choose one. This article describes how to build a static version of Qt in a MinGW environment. If you need a static Qt for MSVC, you may probably find some ideas here but there is definitely some extra work.

When you develop Qt applications on Windows and need to deploy them later on "general purpose" Windows machines, the recommended Qt environment contains two distinct builds of the same version of Qt:. The pre-built dynamic environment shall be used for development and debugging. In addition to the Qt command line tools qmake, moc, uic, lupdate, lrelease, etc. The installation is straightforward, everything is here, well integrated, working like a charm. The static environment shall be used to release the deployment version of the application, after it has been fully developed and debugged using the dynamic environment.

The static environment contains only the Qt command line tools. There are at least two reasons for not building static versions of the GUI tools.

How to create a library with Qt and use it in an application

First, releasing a new version of an application is typically a task that you automate using a script and there is no need for GUI tools at this stage. Second, it is probably impossible to build a static version of Qt Creator because of the lack of support for plugins in a static environment. Although building a static version of your application makes it easier to deploy, there are some restrictions in a static environment. Be sure to check that your application complies with these constraints before going further.

Install the dynamic pre-built package from qt. Select the package named "Qt 5.

qt use static library

The exact name and version may vary. You can also browse the tree of installation packages. Preferably plan the installation of the same version of Qt for the dynamic and static builds. This is not a strict requirement but it is a safe configuration. At the time of writing of this article, the latest Qt version is 5. During installation, select the default installation location C:. Be sure to add the MinGW environment in the installation selectable in the "Tools" branch of the installation options.

If you have a separated MinGW environment that you prefer to use and do not install the one from the Qt package installer, be sure to specify the option -MingwDir in the static build script see below.This tutorial illustrates different approaches for using a custom library in your application on Windows. The first part explains how to create a shared library and how to link against it in your application.

The second part is about creating and using a static library. When creating a shared library that you would like to link against, then you need to ensure that the symbols that are going to be used outside the library are properly exported when the library is created. Subsequently imported when you are linking against the library.

On Windows, MinGW will output. They help link your code to the library and is needed when you build your file. See also the documentation on Creating Shared Libraries.

In order to use the shared library in your application, then you can include the headers of your library in your code and use the methods. Compile with linking to the. At runtime this loads the dll which has the implementation.

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To set this up, then in your application's. In addition you need to ensure that the. QLibrary can be used for loading shared libraries at runtime.

In this case you only need access to the. The following example shows how to set up a library for usage with QLibrary. For the function names to be resolvable, they must be exported as C functions i. To load the library using QLibrary, you can simply pass in the. Make sure the. To use functions from the library in your application, you need to resolve them using QLibrary::resolve.

The example below loads the library created above and uses one of its functions to create and show a widget. In contrast to the shared library example, you don't need to set up anything special for exporting and importing symbols in your. For more information, see Installing Files.

Which approach to choose depends on your needs. When creating a shared library, you need to deploy it with your application. On the plus side, applications and libraries linked against a shared library are small. Whether to use QLibrary to load the.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again.

If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit Fetching latest commit…. Qt Static Library Build a static library to prevent simple apps with big dependencies.

Be careful if you use static library. How to build I will no longer provide pre-built binaries. It is better to build by your own. For Windows XP series, use Qt 5. For Windows Vista series, use Qt 5. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Now, i get lib file after compile, but i can not use it in my project and i get Unresolved external symbols… errors.

So the question is : is it possible to have my own static library in Qt none-commercial license? I have read This Article and it seems nothing is wrong with my code. Learn more. Asked 7 years ago. Active 4 years, 11 months ago. Viewed 2k times. I am trying to make a library for my project.

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Now, i want to get rid of DLL and use lib file as an static library. So i added this line to my library. If yes, what is wrong with my approach?

Any help please? QProgrammer QProgrammer 1 1 silver badge 13 13 bronze badges. Maybe you should add your solution as an answer and accept it? Active Oldest Votes. Sign up or log in Sign up using Google.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm having a hell of a time finding documentation which clearly explains how to use a static library in Qt Creator. It compiles and spits out a ". The problem I encounter is when I try to use the library. I have another project that would like to use it include files in the library, etc but I don't know the proper way to link with the library or include files from the library.

In your project that uses the library make the LIBS variable point to your lib's path. Edited: -L tells qmake that the path is a directory that it can search for libraries -l tells it that the path is a file, but take note of the observation below.

This variable contains a list of libraries to be linked into the project. You can use the Unix -l library and -L library path flags and qmake will do the correct thing with these libraries on Windows namely this means passing the full path of the library to the linker. The only limitation to this is the library must exist, for qmake to find which directory a -l lib lives in. Note: On Windows, specifying libraries with the -l option, as in the above example, will cause the library with the highest version number to be used; for example, libmath2.

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To avoid this ambiguity, we recommend that you explicitly specify the library to be used by including the. In this case on my linux with QMake v 3.

qt use static library

To force linkage with static one you need to specify it explicitly without any options. This should be as easy as it gets but for some reason it is EXTREMELY hard to pull up a search result for because there are so many hits of forums of people asking for help and I've followed every tip I can get but no help Learn more. Using a static library in Qt Creator Ask Question. Asked 10 years, 7 months ago.

Static vs. Shared Libraries

Active 4 years, 5 months ago. Viewed 90k times. Dan O Dan O 3, 5 5 gold badges 25 25 silver badges 41 41 bronze badges. Active Oldest Votes. Dewfy Dewfy I found the answer at doc. I still don't know what the -L or -l mean, but such is the nature of makefiles.

RPG's answer is also relevent, the includepath stuff is important. This didn't work for me but another answer here did, which is right clicking while editing the. From the qmake docs: This variable contains a list of libraries to be linked into the project. Thank you for posting this answer. Cavalieri Giovanni Cavalieri Giovanni 1 1 silver badge 2 2 bronze badges.

You can shorten this to 2 steps. Actually this is the only solution I could make work out of all the answers. All you need is to go to the.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

In my project, I will need to create a dll which call functions from an external library there are. After reading different tutorials, I managed to create the library. Everything you've done so far is correct. Now just include the library header file sharedlib. You need to pack sharedlib. Learn more. Asked 4 years, 2 months ago. Active 4 years, 2 months ago. Viewed 8k times. I think every step is right. If you include your file include "sharedlib. Actually, are you able to compile without any errors?

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You have add function declared in SharedLib class but definition is outside the class. Active Oldest Votes. You need the sharedlib. Try this main.

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Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. To simplify the situation, lets say that there are 2 files: core.

If you are utilizing resources in your static library you should import them in your application as well. Assume that you have a resources file with file name as myResources.

Then, you should initialize this in the app as given below:. Learn more. How do I build a static library and executable with Qt? Ask Question. Asked 8 years ago. Active 1 year, 1 month ago.

qt use static library

Viewed 30k times. I want Qt using qmake and the. How do I set this up in the qmake file? Active Oldest Votes. Masci Masci 4, 1 1 gold badge 20 20 silver badges 21 21 bronze badges.

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How to handle the case where core. We don't want app. MainWindow w; w. Sign up or log in Sign up using Google.


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