Free Pascal Runtime Library

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The Free Pascal Runtime Library, abbreviated RTL, is Free Pascal's runtime library.

Interaction of class libraries and widgetsets in Lazarus and Free Pascal

The RTL consists of a collection of units that provide components and classes for general programming tasks. It acts as a basis for Free Pascal's Free Component Library (FCL) and the Lazarus Component Library (LCL). The RTL is licensed under the LGPL with a static linking exception.

Further reading

  • Michaël van Canneyt; Florian Klämpfl (2012), Free Pascal (Free Pascal 2 ed.), Computer & Literatur Verlag GmbH, ISBN 978-3936546729, 393654672X
  • Roderick Person (2013), Getting Started with Lazarus IDE, Packt Publishing, ISBN 978-1782163404, 1782163409