Free Pascal Compiler Adds Dynamic Package Support

The Free Pascal Compiler now provides dynamic package support, letting developers distribute plugins that load at runtime without IDE recompilation. These packages are shared libraries carrying compiler-generated metadata about their exported types and classes, inspectable through new RTL functions. Deployment can be either single-file binaries or modular plugin systems where packages swap live.

Implementation constraints mirror the benefits: unit identifiers must be unique across the entire package ecosystem to prevent collisions, and units within a package cannot use the package name itself—resolved by automatic renaming conventions. The metadata overhead makes packages larger than standard libraries and incompatible with stripping tools. Runtime mechanisms bridge type compatibility across package boundaries for strings, arrays, and thread-local variables.

The Lazarus IDE gains features targeting rapid development. A dockable package navigator with persistent history replaces menu hunting, and component changes recompile in seconds without full IDE rebuilds. Automatic change detection triggers package regeneration at startup. Platform-specific deployment is now possible via per-package OS and widget-set targeting, bulk operations reduce tedium, and visual form designs can be converted directly into packaged components. The implementation is available on GitLab.