Static Linking vs Dynamic Linking for LGPL-Compliant Qt Distribution

When preparing a Qt application for production deployment, the choice between static and dynamic linking involves a trade-off between binary portability and legal compliance under the LGPL license.

Static linking creates a standalone executable that eliminates runtime dependency errors on target systems where the Qt framework is not installed. However, LGPL requirements for static builds typically necessitate providing object files to allow end-users to relink the application with modified library versions.

Dynamic linking maintains a smaller binary size and simplifies license compliance by allowing users to replace shared libraries. This approach introduces the risk of production failures if the deployment environment lacks the required DLLs or shared objects, necessitating the use of tools like windeployqt or macdeployqt.

Technical Constraints

• Target environment: Clean OS without pre-installed Qt frameworks.
• Licensing: LGPL compliance for distributed binaries.
• Maintenance: Ability to update libraries without full recompilation.

Given these constraints, which linking strategy provides the most sustainable balance between deployment reliability and license adherence? In what scenarios does the overhead of providing object files for static builds outweigh the complexity of managing dynamic dependency bundles?