Free Pascal is a 32- and 64-bit Pascal compiler. The current version (3.2.2) can compile code for the following processors (the list is not exhaustive):
The compiler and Run-Time Library are available for the following operating systems:
The complete list is at all times available on the Free Pascal website.
Free Pascal is designed to be, as much as possible, language and source-level compatible with ISO pascal, Mac Pascal, Turbo Pascal 7.0 and most (if not all) versions of Delphi. It achieves this through a system of compiler directives which tell the compiler what language is targeted (they can be mixed to a certain degree).
It also differs from them in the sense that you cannot use compiled units from one system for the other, i.e. you cannot use TP compiled units.
Also, there is a text version of an Integrated Development Environment (IDE) available for Free Pascal. Users that prefer a graphical IDE can have a look at the Lazarus1 or MSEIDE2 projects.
Free Pascal consists of several parts :
Of these you only need the first two, in order to be able to use the compiler. In this document, we describe the use of the compiler and utilities. The supported (Object) Pascal Language constructs are described in the Reference Guide, and the available routines (units) are described in the RTL and FCL Unit reference guides.
1Lazarus homepage at http://http://www.lazarus-ide.org/
2MSEIDE+MSEGUI homepage at http://www.msegui.org/