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Introduction - GCC and GCCSDK

GCCSDK is really two closely related sub-projects - GCC for RISC OS and GCCSDK, the environment for developing GCC and porting programs to RISC OS. The documentation is split accordingly.


GCC is a complete, free and fully-featured compiler solution for RISC OS. It can compile C, C++, and Fortran using modern standards. It also includes support for RISC OS modules, and usage of the native RISC OS Shared C Library, or the bundled Unix-compatibility library, UnixLib. Bundled with it are several development tools such as GNU Make, and an assembler. It aims to be feature complete above and beyond the commercial Castle C/C++ compiler suite.

There also exist front ends for other languages, such as Objective C, Ada 9X, Modula-3, Pascal, Cobol and Java, however these have not been ported to run on RISC OS at this time.


GCC Software Development Kit (GCCSDK) is a portable build environment for creating RISC OS executables to be run natively on RISC OS. The build environment is designed to be hosted on a Unix-like system, such as GNU/Linux, FreeBSD, Solaris, MacOS X or even Windows (under Cygwin). GCCSDK releases are tied-in with the corresponding GCC releases.

GCCSDK can be used to compile and develop GCC and UnixLib itself, or as the basis for a cross-compiling system. It includes a number of "porting scripts" which automate the process of building and configuring new ports, which would otherwise be difficult and error prone, and not possible when done natively under RISC OS.

GCCSDK Autobuilder

The autobuilder is a powerful system for automatically fetching, configuring and building of sources and dependencies for programs, making use of the porting scripts. Done manually, such a process would be tedious, time-consuming and error prone. Once a program is added to the autobuilder, other developers can easily reproduce the work, and concentrate on the important details.

The autobuilder presently includes instructions for building around 150 libraries and programs for RISC OS.

RISC OS GCC Related Information

Pages relevant to using GCC.

Distributing GCC compiled programs

When you distribute a GCC compiled program and are using the SharedCLibrary as runtime library (i.e. using option -mlibscl), then no additional support files need to be made available with your program.

On the other hand when you are using UnixLib as runtime library (and that's the default runtime library), then an up-to-date version of some UnixLib support modules need to be used together with your program. The following is an overview of these support modules :

The modules SharedUnixLibrary, Digital Renderer, Iconv and CryptRandom will be RMEnsure'd with their minimal needed version number by the UnixLib code at the moment their functionality is needed. Appropriate error message will be returned when these modules are not available or when they do not have a sufficent high enough version number.

When you distribute a copy of these UnixLib support modules with your program, please also mention the URLs in documentation and/or installation notes or program where up-to-date versions can be found.


All recent GCCSDK GCC Releases can be found at [1]. Details on what is changed in each release can be found at GCCSDK Releases.

Mailing list

A mailing list exists for GCCSDK discussions.

Bug reporting

To keep track of bugs in GCCSDK we are using a bug-tracking system. It is preferable to use this rather than e-mailing in order to avoid mails getting lost in our rather large inboxes and also in order to have an overview of any outstanding issues.

GCCSDK Source Repository

Until beginning of March 2006 all our GCCSDK source code was managed using CVS. At that point we converted our CVS repository into a Subversion repository and are no longer using CVS. Details how to access GCCSDK source repository can be found at our source repositories overview.

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