Software:Free Pascal

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Short description: Free compiler and IDE for Pascal and ObjectPascal
Free Pascal
Free Pascal 3.2.2 help screen.png
Free Pascal 3.2.2 help screen
Developer(s)Florian Klämpfl & volunteers
Initial release1997; 27 years ago (1997)
Stable release
3.2.2 / May 20, 2021; 3 years ago (2021-05-20)
Preview release
3.3.1
Written inObject Pascal
Operating systemCross-platform, embedded
TypeCompiler, embedded operating system
LicenseGNU General Public License for the compiler and utility executables. GNU Lesser General Public License with static linking exception for the runtime, package, component and other libraries that become part of executables created with the compiler
Websitewww.freepascal.org

Free Pascal Compiler (FPC) is a compiler for the closely related programming-language dialects Pascal and Object Pascal. It is free software released under the GNU General Public License, with exception clauses that allow static linking against its runtime libraries and packages for any purpose in combination with any other software license.

It supports its own Object Pascal dialect, as well as the dialects of several other Pascal family compilers to a certain extent, including those of Borland Pascal (named "Turbo Pascal" until the 1990 version 6), Borland (later Embarcadero) Delphi, and some historical Macintosh compilers. The dialect is selected on a per-unit (module) basis, and more than one dialect can be used per program.

It follows a write once, compile anywhere philosophy and is available for many CPU architectures and operating systems (see Targets). It supports inline assembly language and includes an internal assembler capable of parsing several dialects such as AT&T and Intel style.

There are separate projects to facilitate developing cross-platform graphical user interface (GUI) applications, the most prominent one being the Lazarus integrated development environment (IDE).

Supported dialects

Initially, Free Pascal adopted the de facto standard dialect of Pascal programmers, Borland Pascal, but later adopted Delphi's Object Pascal. From version 2.0 on, Delphi compatibility has been continuously implemented or improved.

The project has a compilation mode concept, and the developers made it clear that they would incorporate working patches for the standardized dialects of the American National Standards Institute (ANSI) and International Organization for Standardization (ISO) to create a standards-compliant mode.

A small effort has been made to support some of the Apple Pascal syntax to ease interfacing to the Classic Mac OS and macOS. The Apple dialect implements some standard Pascal features that Turbo Pascal and Delphi omit.

The 2.2.x release series did not significantly change the dialect objectives beyond roughly Delphi 7 level syntax, instead aiming for closer compatibility. A notable exception to this was the addition of support for generics to Free Pascal in version 2.2.0, several years before they were supported in any capacity by Delphi.

In 2011 several Delphi 2006-specific features were added in the development branch, and some of the starting work for the features new in Delphi 2009 (most notably the addition of the UnicodeString type) was completed. The development branch also has an Objective-Pascal extension for Objective-C (Cocoa) interfacing.

As of version 2.7.1, Free Pascal implemented basic ISO Pascal mode, though many things such as the Get and Put procedures, and the file-buffer variable concept for file handling were still absent.

As of version 3.0.0, ISO Pascal mode is fairly complete. It has been able to compile standardpascal.org's P5 ISO Pascal compiler with no changes.

History

Early years

Free Pascal was created when Borland clarified that Borland Pascal development for DOS would stop with version 7, to be replaced by a Windows-only product, which later became Delphi.

Student Florian Paul Klämpfl began developing his own compiler written in the Turbo Pascal dialect and produced 32-bit code for the GO32v1 DOS extender, which was used and developed by the DJ's GNU Programming Platform (DJGPP) project at that time.

Originally, the compiler was a 16-bit DOS executable compiled by Turbo Pascal. After two years, the compiler was able to compile itself and became a 32-bit executable.

Expansion

The initial 32-bit compiler was published on the Internet, and the first contributors joined the project. Later, a Linux port was created by Michael van Canneyt, five years before the Borland Kylix Pascal compiler for Linux became available.

The DOS port was adapted for use in OS/2 using the Eberhard Mattes eXtender (EMX) which made OS/2 the second supported compiling target. As well as Florian Klämpfl the original author, Daniël Mantione also contributed significantly to make this happen, providing the original port of the run-time library to OS/2 and EMX. The compiler improved gradually, and the DOS version migrated to the GO32v2 extender. This culminated in release 0.99.5, which was much more widely used than prior versions, and was the last release aiming only for Borland Pascal compliance; later releases added a Delphi compatibility mode. This release was also ported to systems using Motorola 68000 family (m68k) processors.

With release 0.99.8 the Win32 target was added, and a start was made with incorporating some Delphi features. Stabilizing for a non-beta release began, and version 1.0 was released in July 2000. The 1.0.x series was widely used, in business and education. For the 1.0.x releases, the port to 68k CPU was redone, and the compiler produced stable code for several 68k Unix-like and AmigaOS operating systems.

Version 2

During the stabilization of what would become 1.0.x, and also when porting to the Motorola 68k systems, it was clear that the design of the code generator was far too limited in many aspects. The principal problems were that adding processors meant rewriting the code generator, and that the register allocation was based on the principle of always keeping three free registers between building blocks, which was inflexible and difficult to maintain.

For these reasons, the 1.1.x series branched off from the 1.0.x main branch in December 1999. At first, changes were mostly clean-ups and rewrite-redesigns to all parts of the compiler. The code generator and register allocator were also rewritten. Any remaining missing Delphi compatibility was added.

The work on 1.1.x continued slowly but steadily. In late 2003, a working PowerPC port became available, followed by an ARM port in summer 2004, a SPARC port in fall 2004, and an x86-64-AMD64 port in early 2004, which made the compiler available for a 64-bit platform.

In November 2003, a first beta release of the 1.1.x branch was packaged and numbered 1.9.0. These were quickly followed by versions 1.9.2 and 1.9.4; the latter introduced OS X support. The work continued with version 1.9.6 (January 2005), 1.9.8 (late February 2005), 2.0.0 (May 2005), 2.0.2 (December 2005), and 2.0.4 (August 2006).

Version 2.2.x

In 2006, some of the major reworks planned for 2.2, such as the rewrite of the unit system, had still not begun, and it was decided to instead start stabilizing the already implemented features.

Some of the motives for this roadmap change were the needs of the Lazarus integrated development environment project, particularly the internal linker, support for Win64, Windows CE, and OS X on x86, and related features like DWARF. After betas 2.1.2 and 2.1.4, version 2.2.0 was released in September 2007, followed by version 2.2.2 in August 2008 and version 2.2.4 in March 2009.

The 2.2.x series vastly improved support for the ActiveX and Component Object Model (COM) interface, and Object Linking and Embedding (OLE), though bugs were still being found. The delegation to interface using the implements keyword was partly implemented, but was not complete (As of March 2011).[1] Library support for ActiveX was also improved.

Another major feature was the internal linker for Win32, Win64, and Windows CE, which greatly improved linking time and memory use, and make the compile-link-run cycle in Lazarus much faster. The efficiency for smart-linking, or dead code elimination, was also improved.

Minor new features included improved DWARF (2/3) debug format support, and optimizations such as tail recursion, omission of unneeded stack frames and register-based common subexpression elimination (CSE) optimization. A first implementation of generic programming (generics) support also became available, but only experimentally.

Version 2.4.x

The 2.4.x release series had a less clear set of goals than earlier releases. The unit system rewrite was postponed again, and the branch that became 2.4 was created to keep risky commits from 2.2 to stabilize it. Mostly these risky commits were more involved improvements to the new platforms, Mac PowerPC 64, Mac x86-64, iPhone, and many fixes to the ARM and x86-64 architectures in general, as well as DWARF.

Other compiler improvements included whole program optimization (WPO) and devirtualization and ARM embedded-application binary interface (EABI) support.

Later, during the 2.2 cycle, a more Delphi-like resource support (based on special sections in the binary instead of Pascal constants) was added. This feature, direly needed by Lazarus, became the main highlight of the branch.

Other more minor additions were a memory manager that improved heap manager performance in threaded environments, small improvements in Delphi compatibility such as OleVariant, and improvements in interface delegation.

On January 1, 2010, Free Pascal 2.4.0 was released, followed on November 13, 2010, by bug fix release 2.4.2, with support for for..in loops, sealed and abstract classes, and other changes.[2]

Version 2.6.x

In January 2012, Free Pascal 2.6 was released. This first version from the 2.6 release series also supported Objective Pascal on OS X and iOS targets and implemented many small improvements and bug fixes. In February 2013, FPC 2.6.2 was released. It contained NetBSD and OpenBSD releases for the first time since 1.0.10, based on fresh ports. In March 2014, the last point release in the 2.6 series, 2.6.4, was launched, featuring mostly database (fcl-db) updates.

Version 3.0.x

Version 3.0.0 was released on November 25, 2015, and was the first major release since January 1, 2012. It introduced many new language features.[3]

Version 3.0.2 was released on February 15, 2017, and includes bug fixes and minor compiler updates.
Version 3.0.4 was released on November 28, 2017.
It includes many language improvements over previous versions, including an internal linker for Executable and Linkable Format (ELF), Arm AARCH64 for iOS and Linux, a revived i8086 platform, extended libraries and much more.

Version 3.2.x

The next major release, version 3.2.0, was published on June 19, 2020. It introduced many new language features, including generic routines, standard namespaces, managed records and expanded functionality for dynamic arrays, in addition to the advent of new standard units and the support of additional platforms.[4]

Version 3.2.2 was released on May 20, 2021, and supports macOS on AArch64 and naming of threads. Additionally it includes bug fixes and minor compiler updates.[5]

Targets

Processor architecture Operating system, device Version 3.2.2 or 3.3.1 (Trunk) Version 3.0.0 - 3.2.0 Version 2.6.2 Version 2.6.0 Version 2.4.4 Version 2.4.2 Version 2.4.0 Version 2.2.4 Version 2.0.x Version 1.0.x
i386 DOS (GO32v2 extender) Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
FreeBSD Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
OpenBSD Yes Yes Yes No No No No No No Yes
NetBSD Yes Yes Yes No No No No No No Yes
Linux Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
macOS Yes Yes Yes Yes Yes Yes Yes Yes No No
OS/2 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Windows Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Windows CE Yes Yes Yes Yes Yes Yes Yes No No No
BeOS Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Haiku Yes Yes Yes Yes Yes Yes Yes No No No
NetWare Yes Yes Yes Yes Yes Yes Yes Yes Yes No
Solaris Yes Yes Yes Yes Yes Yes No No No Yes
iPhone Sim Yes Yes Yes Yes No No No No No No
QNX Neutrino Yes No No No No No No No No Yes
Android Yes Yes Yes No No No No No No No
AROS Yes Yes No No No No No No No No
x86-64 FreeBSD Yes Yes Yes Yes Yes Yes No No No No
OpenBSD Yes Yes Yes Unknown Unknown Unknown Unknown Unknown Unknown Unknown
NetBSD Yes Yes Yes Unknown Unknown Unknown Unknown Unknown Unknown Unknown
Linux Yes Yes Yes Yes Yes Yes Yes Yes Unknown No
macOS Yes Yes Yes Yes Yes Yes Yes No No No
Windows Yes Yes Yes Yes Yes Yes Yes No No No
iPhone Sim Yes Yes Yes Yes No No No No No No
AROS Yes Yes Yes Yes Yes Yes No No No No
DragonFly BSD Yes Yes Yes Yes Yes Yes No No No No
Solaris Yes Yes Yes Yes Yes Yes No No No No
Haiku Yes Yes No No No No No No No No
Android Yes Yes No No No No No No No No
ARM iOS Yes Yes Yes Yes Yes Yes Yes No No No
Game Boy Advance Yes Yes Yes Yes Yes Yes Yes No No No
Nintendo DS Yes Yes Yes Yes Yes Yes Yes No No No
Linux Yes Yes Yes Yes Yes Yes Yes Yes Unknown No
Windows CE Yes Yes Yes Yes Yes Yes Yes Yes Unknown No
Android Yes Yes Yes No No No No No No No
Embedded Yes Yes Yes No No No No No No No
Embedded Rasp-Pi Yes Yes No No No No No No No No
AROS Yes Yes No No No No No No No No
AArch64 Linux Yes Yes Yes No No No No No No No
iOS Yes Yes Yes No No No No No No No
Android Yes Yes No No No No No No No No
macOS Yes No No No No No No No No No
AVR Embedded Yes Yes No No No No No No No No
PowerPC Linux Yes Yes Yes Yes Yes Yes Yes Yes Yes No
macOS Yes Yes Yes Yes Yes Yes Yes Yes Yes No
Classic Mac OS Yes Yes Yes Yes Yes No No Yes Yes No
AmigaOS 4 Yes Yes Yes Yes Yes Unknown Unknown Unknown Yes No
MorphOS Yes Yes Yes Yes Yes Unknown Unknown Unknown Yes No
AIX Yes Yes Yes Yes No No No No No No
Wii Yes Yes Yes Yes Yes No No No No No
PowerPC 64-bit Linux Yes Yes Yes Yes Yes Yes Yes Yes No No
macOS Yes Yes Yes Yes Yes Yes Yes No No No
AIX Yes Yes Yes Yes No No No No No No
SPARC Solaris Yes Yes Yes Yes Yes Yes No No No No
NetBSD Yes Yes Yes Yes Yes Yes No No No No
Embedded Yes Yes Yes Yes Yes Yes No No No No
Linux Yes Yes Yes Yes Yes Yes No No No No
SPARC64 Linux Yes Yes Yes Yes No No No No No No
RISC-V Embedded Yes Yes No No No No No No No No
RISC-V64 Embedded Yes Yes No No No No No No No No
Java virtual machine Java Yes Yes No No No No No No No No
Android Yes Yes No No No No No No No No
MIPS (BE and LE) Linux Yes Yes No No No No No No No No
Embedded Yes Yes No No No No No No No No
8086 (16-bit) DOS Yes Yes No No No No No No No No
Win16 Yes Yes No No No No No No No No
Embedded Yes Yes No No No No No No No No
m68k Linux Yes Yes No No No No No No No Yes
NetBSD Yes Yes No No No No No No No Yes
AmigaOS Yes Yes No No No No No No No Yes
Atari TOS Yes Yes No No No No No No No Yeslimited cross-compiler only
Palm OS Yes Yes No No No No No No No Unknown
Z80 Embedded Yes No No No No No No No No No
ZX Spectrum Yes No No No No No No No No No
MSX-DOS Yes No No No No No No No No No
WebAssembly Web browsers Yes No No No No No No No No No

Free Pascal also supports byte code generation for the Java Virtual Machine as of version 3.0.0 and targets both Oracle's Java and Google's Android JVM,[6] although Object Pascal syntax is not fully supported. Free Pascal 3.0.0 also supports ARMHF platforms like the Raspberry Pi, including ARMV6-EABIHF running on Raspbian. Work on 64-bit ARM has resulted in support for iOS in 3.0.0 as well. A native ARM Android target has been added, ending the formerly hacked ARM Linux target to generate native ARM libraries for Android. This makes porting Lazarus applications to Android (using Custom Drawn Interface[7]) easier. Since FPC 2.6.2, OpenBSD and NetBSD are supported on IA32 and X86_64 architectures. A new target embedded has been added for usage without OS (ARM Cortex M and MIPS mainly). With InstantFPC it is possible to run Pascal programs, which are translated just in time, as Unix scripts or CGI back-end.

Ultibo core is an embedded or bare metal development environment for Raspberry Pi.[8] Ultibo is based on Free Pascal and developed under a modified version of Lazarus. The IDE is PC based but has been ported to Linux and Mac as well. Ultibo is an OS-less runtime and has support for most functions and allows the programmer full control over the hardware via the RTL units. The runtime implements multi-threaded, pre-emptive multitasking. The programmer can put threads on a specific CPU or let the runtime divide the load automatically or a mix of the two. Most Raspberry Pi models are supported including the A, B, A+ and B+ as well as the Raspberry Pi 2B, 3B, 4B/400/CM4 and Zero.[9]

Integrated development environments

Like most modern compilers, Free Pascal can be used with an integrated development environment (IDE). Besides independent IDEs there are also plugins to various existing IDEs

Lazarus IDE in Windows 10
Free Pascal IDE in Linux showing "Hello, World!" program in German
  • Free Pascal has its own text-mode IDE resembling Turbo Pascal's IDE. It is made using the Free Vision framework (also included with Free Pascal), a Turbo Vision clone. In addition to many features of the Turbo Pascal IDE, it has code completion and support for multiple help file formats (HTML, Microsoft Compiled HTML Help (CHM), Information Presentation Facility (IPF). Instead of using command line tools, the IDE uses its own embedded compiler, based on the same source as the command line compiler and debugger (using libgdb or GDBMI) to provide its functionality.
  • Dev-Pascal is a free Windows-only IDE for Free Pascal and GNU Pascal, with no further development following the 2004 FPC version and the 2005 GPC version.

Bundled libraries

Apart from a compiler and an IDE, Free Pascal provides the following libraries:

Examples of software produced with Free Pascal

  • ULTIBO Core[10]] is a development environment targeting bare-metal (no operating system) Raspberry Pi boards. It uses FreePascal/Lazarus and links the application with an unikernel runtime.
  • Beyond Compare is a data comparison utility for Windows, OS X, and Linux. The Linux and OS X versions are compiled with Lazarus/FPC.
  • Cartes du Ciel is a free planetarium program for Linux, OS X, and Windows. It maps and labels most constellations, planets, and objects visible by telescope. It was fully written in Lazarus/FPC, and released under GPL.
  • Cheat Engine is a proprietary, source available, Freeware memory scanner, hex editor, and debugger. It can be used for cheating in computer games. Since version 6.0 it is compiled with Lazarus/FPC.
  • D 2D & D 3D data plotting programs.[11]
  • Double Commander is an open-source multi-platform two-panel orthodox file manager inspired by the Microsoft Windows-only Total Commander.
  • Free Pascal is written in Object Pascal and assembly language, and self-compiled.
  • HNSKY, Hallo Northern Sky is a free planetarium program for Windows and Linux. Since version 3.4.0 written & compiled with Lazarus/FPC.
  • Lazarus: Free Pascal's affiliated Delphi-like software package for rapid development of graphical applications.
  • MeKin2D: package for planar linkage, cam and gear mechanism kinematics.[12]
  • Morfik: Morfik WebOS AppBuilder uses Free Pascal to produce CGI binaries.
  • MyNotex is a free software note-taking and notes manager for Linux.
  • Early versions of the Nim compiler were developed in Free Pascal, before it became self-hosting in Nim.[13]
  • Peazip is an open source archiver, made with Lazarus/FPC.
  • TorChat, previously written in Python, is now being rewritten in Free Pascal and Lazarus.
  • Tranzistow [14] is a 32/64-bit software synthesizer for Windows and Linux developed with FreePascal/Lazarus.

See also

  • fpGUI Free Pascal GUI toolkit – a cross-platform and custom-drawn toolkit implemented in Object Pascal

References

  1. ↑ bugs.freepascal.org
  2. ↑ User Changes 2.4.2
  3. ↑ "FPC New Features 3.0.0". https://wiki.freepascal.org/FPC_New_Features_3.0.0. 
  4. ↑ "FPC New Features 3.2.0 - Free Pascal wiki". https://wiki.freepascal.org/FPC_New_Features_3.2.0. 
  5. ↑ "FPC New Features 3.2.2 - Free Pascal wiki". https://wiki.freepascal.org/FPC_New_Features_3.2.2. 
  6. ↑ freepascal wiki: FPC JVM
  7. ↑ Custom Drawn Interface
  8. ↑ "Ultibo embedded Runtime Library". Ultibo. https://ultibo.org/. 
  9. ↑ "Ultibo supported Pi boards". Ultibo.org. https://ultibo.org/faq/. 
  10. ↑ "ULIBO Core". https://ultibo.org. 
  11. ↑ "D_2D and D_3D plotting programs". https://sourceforge.net/projects/d2d-and-d3d/. 
  12. ↑ "MeKin2D: Subroutines for planar linkage mechanism kinematic simulation". https://sourceforge.net/projects/mekin2d/. 
  13. ↑ "Nim Pascal source". https://github.com/nim-lang/Nim/tree/ea1f1ec6d4d6c776eb0f81c2bebdd4cb4c817ebe/nim. 
  14. ↑ "Tranzistow". https://www.hrastprogrammer.com/hrastwerk/tranzistow.htm. 

External links

Official websites

  • FPC
  • Lazarus RAD IDE

General introduction

Sites specialized in game development



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