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What is SDCC?

SDCC is a retargettable, optimizing Standard C (ANSI C89, ISO C99, ISO C11) compiler suite that targets the Intel MCS51 based microprocessors (8031, 8032, 8051, 8052, etc.), Maxim (formerly Dallas) DS80C390 variants, Freescale (formerly Motorola) HC08 based (hc08, s08), Zilog Z80 based MCUs (z80, z180, gbz80, Rabbit 2000/3000, Rabbit 3000A, TLCS-90), Padauk (pdk14, pdk15) and STMicroelectronics STM8. Work is in progress on supporting the Padauk (pdk13), Microchip PIC16 and PIC18 targets. It can be retargeted for other microprocessors.

SDCC suite is a collection of several components derived from different sources with different FOSS licenses. SDCC compiler suite include:

sdas and sdld, a retargettable assembler and linker, based on ASXXXX, written by Alan Baldwin; (GPL).
sdcpppreprocessor, based on GCC cpp; (GPL).
ucsimsimulators, originally written by Daniel Drotos; (GPL).
sdcdbsource level debugger, originally written by Sandeep Dutta; (GPL).
sdbinutilslibrary archive utilities, including sdar, sdranlib and sdnm, derived from GNU Binutils; (GPL)
SDCC run-time libraries; (GPL+LE). Pic device libraries and header files are derived from Microchip header (.inc) and linker script (.lkr) files. Microchip requires that 'The header files should state that they are only to be used with authentic Microchip devices' which makes them incompatible with the GPL.
gcc-testregression tests, derived from gcc-testsuite; (no license explicitely specified, but since it is a part of GCC is probably GPL licensed)
packihx; (public domain)
makebin; (zlib/libpng License)
sdccC compiler, originally written by Sandeep Dutta; (GPL). Some of the features include:
- extensive MCU specific language extensions, allowing effective use of the underlying hardware.
- a host of standard optimizations such as global sub expression elimination, loop optimizations (loop invariant, strength reduction of induction variables and loop reversing), constant folding and propagation, copy propagation, dead code elimination and jump tables for 'switch' statements.
- MCU specific optimizations, including a global register allocator.
- adaptable MCU specific backend that should be well suited for other 8 bit MCUs
- independent rule based peep hole optimizer.
- a full range of data types: char (8 bits, 1 byte), short (16 bits, 2 bytes), int (16 bits, 2 bytes), long (32 bit, 4 bytes), long long (64 bit, 8 bytes), float (4 byte IEEE) and _Bool/bool.
- the ability to add inline assembler code anywhere in a function.
- the ability to report on the complexity of a function to help decide what should be re-written in assembler.
- a good selection of automated regression tests.

SDCC was originally written by Sandeep Dutta and released under a GPL license. Since its initial release there have been numerous bug fixes and improvements. As of December 1999, the code was moved to SourceForge where all the 'users turned developers' can access the same source tree. SDCC is constantly being updated with all the users' and developers' input.

News

Jan 30th, 2020: SDCC 4.0.0 released.

A new release of SDCC, the portable optimizing compiler for 8051, DS390, Z80, Z180, Rabbit 2000, GBZ80, eZ80, TLCS-90, HC08, STM8, Padauk and PIC microprocessors is now available (http://sdcc.sourceforge.net). Sources, documentation and binaries for GNU/Linux amd64, Windows amd64, macOS amd64 and Windows x86 are available.

SDCC 4.0.0 New Feature List:

The pdk15 backend now passes the regression tests (both with and without --stack-auto), and is thus considered stable.
New in-development pdk13 backend for Padauk µC with 13-bit wide program memory.
C2X memccpy(), strdup(), strndup().
Better tail call optimization.
Many fixes in the pic14 backend.
C2X u8 character constants.
C2X bool, static_assert, alignof, alignas.
C2X attributes on statements.
C2X attribute declarations.
Support for extended ASCII characters in sdas, sdld.
Compiler support for UCNs and non-ASCII utf8 in identifiers.

Numerous other new features and bug fixes are included as well.

You can download the release from:
https://sourceforge.net/projects/sdcc/files/

What Platforms are Supported?

Linux - x86, Microsoft Windows - x86, Microsoft Windows - x86_64 and Mac OS X are the primary, so called 'officially supported' platforms.

SDCC compiles natively on Linux and Mac OS X using gcc. Windows release and snapshot builds are made by cross compiling to mingw32 on a Linux host.

Windows 9x/NT/2000/XP/Vista/7/8 users are recommended to use Cygwin (http://sources.redhat.com/cygwin/) or may try the unsupported Microsoft Visual C++ build scripts.

Downloading SDCC

See the Sourceforge download page for the last released version including source and binary packages for Linux - x86, Microsoft Windows - x86, Microsoft Windows - x86_64 and Mac OS X - ppc and i386.

Major Linux distributions take care of SDCC installation packages themselves and you will find SDCC in their repositories. Unfortunately SDCC packages included in Linux disributions are often outdated. In this case users are encouraged to compile the latest official SDCC release or a recent snapshot build by themselves or download the pre-compiled binaries from Sourceforge download page.

SDCC is known to compile from the source code also on the following platforms:

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Linux - x86_64
Linux - Alpha
Linux - IBM Power5
NetBSD - i386
NetBSD - Sparc64
FreeBSD - i386
SUN Solaris - i386
SUN Solaris - Sparc
Rasbian (Debian for Raspberry Pi) - ARMv6
Debian - ARMv7-a

SDCC is always under active development. Please consider downloading one of the snapshot builds if you have run across a bug, or if the above release is more than two months old.

The latest development source code can be accessed using Subversion. The following will fetch the latest sources:

svn checkout svn://svn.code.sf.net/p/sdcc/code/trunk/sdcc sdcc

... will create the sdcc directory in your current directory and place all downloaded code there. You can browse the Subversion repository here.

Before reporting a bug, please check your SDCC version and build date using the -v option, and be sure to include the full version string in your bug report. For example:

sdcc/bin > sdcc -v SDCC : mcs51/gbz80/z80/avr/ds390/pic14/TININative/xa51 2.3.8 (Feb 10 2004) (UNIX)

Support for SDCC

SDCC and the included support packages come with fair amounts of documentation and examples. When they aren't enough, you can find help in the places listed below. Here is a short check list of tips to greatly improve your chances of obtaining a helpful response.

Attach the code you are compiling with SDCC. It should compile 'out of the box'. Snippets must compile and must include any required header files, etc. Incomplete information will hamper your chance of a timely response.
Specify the exact command you use to run SDCC, or attach your Makefile.
Specify the SDCC version (type 'sdcc -v'), your platform and operating system.
Provide an exact copy of any error message or incorrect output.

Please attempt to include these 4 important parts, as applicable, in all requests for support or when reporting any problems or bugs with SDCC. Though this will make your message lengthy, it will greatly improve your chance that SDCC users and developers will be able to help you. Some SDCC developers are frustrated by bug reports without code provided that they can use to reproduce and ultimately fix the problem, so please be sure to provide sample code if you are reporting a bug!

Web Page - you are (X) here.
Mailing list: [use 'BUG REPORTING' below if you believe you have found a bug.]
- Send to the developer list <sdcc-devel.AT.lists.sourceforge.net> - for development work on SDCC
- Send to the user list <sdcc-user.AT.lists.sourceforge.net> - [preferred] all developers and all users.
Bug Reporting - if you have a problem using SDCC, we need to hear about it. Please attach code to reproduce the problem, and be sure to provide your email address so a developer can contact you if they need more information to investigate and fix the bug.
Website/Documentation Issues - Please report erroneous, missing or outdated information
SDCC Message Forum - an account on Sourceforge is needed if you're going to post and reply. Short easy online fill-in the blanks.
Open Knowledge Web Site - Run by Thorsten Godau <thorsten.godau.AT.gmx.de>

Who is SDCC?

Sandeep Dutta <sandeep.AT.users.sourceforge.net> - original author (SDCC's version of Torvalds)
Jean Loius-VERN <jlvern.AT.writeme.com> - substantial improvement in the back-end code generation.
Daniel Drotos <drdani.AT.mazsola.iit.uni-miskolc.hu> - Freeware simulator for 8051.
Kevin Vigor <kevin.AT.vigor.nu> - numerous enhancements and bug fixes to the Dallas ds390 tree.
Johan Knol <johan.knol.AT.users.sourceforge.net> - testing and patching ds390 tree, bug stompper extrodanaire
Scott Dattalo <scott.AT.dattalo.com> - sdcc for Microchip PIC controller target
Karl Bongers <karl.AT.turbobit.com> - mcs51 support, winbin builds, and an occasional bug.
Bernhard Held <bernhard.AT.bernhardheld.de> - snpshot builds and general housekeeping
Frieder Ferlemann <Frieder.Ferlemann.AT.web.de> - contributions to the documentation and last stages of code generation
Jesus Calvino-Fraga <jesusc.AT.ece.ubc.ca> - math functions, AOMF51, linker improvements
Borut Ražem <borut.razem.AT.gmail.com> - WIN32 MSC, cygwin and mingw ports, NSIS installer, preprocessor and front end improvements, bug fixing, snapshot builds on Distibuted Compile Farm, ...
Vangelis Rokas <vrokas.AT.otenet.gr> - PIC16 taget development for Microchip PIC18F microcontrollers
Erik Petrich <epetrich.AT.users.sourceforge.net> - Bug fixes and improvements for the front end, 8051, z80 and hc08
Dave Helton <dave.AT.kd0yu.com> - website design
Paul Stoffregen <paul.AT.pjrc.com> - mcs51 optimizations and website maintenance.
Michael Hope <michaelh.AT.juju.net.nz> - initial Z80 target, additional coding and bug fixes.
Maarten Brock <sourceforge.brock.AT.dse.nl> - several bug fixes and improvements, esp. for mcs51 target
Raphael Neider <RNeider.AT.web.de> - bug fixes and optimizations for PIC16, completion of the PIC14 target
Philipp Klaus Krause <pkk.AT.spth.de> - work on the STM8,Z80,Z180,Rabbit,GBZ80,TLCS-90 backends, compiler research
Leland Morrison <enigmalee.AT.sourceforget.net> - Rabbit 2000 support: the target code generator, sdasrab assembler and ucsim support
Molnár Károly <molnarkaroly.AT.users.sf.net> - adding pic devices, developing and maintaining pic device files generation scripts
Ben Shi <powerstudio1st.AT.163.com> - the front-end, the STM8 back-end, and the MCS-51 back-end maintain

SDCC has had help from a number of external sources, including:

Alan Baldwin <baldwin.AT.shop-pdp.kent.edu> - Initial version of ASXXXX and ASLINK.
John Hartman <noice.AT.noicedebugger.com> - Porting ASXXXX and ASLINK for 8051.
Dmitry S. Obukhov <dso.AT.usa.net> - malloc and serial I/O routines.
Pascal Felber - Some of the Z80 related files are borrowed from the Gameboy Development Kit (GBDK).
The GCC development team - for GNU C preprocessor, the basis of sdcpp preprocessor and gcc test suite, partially included into the SDCC regression test suite
The GNU Binutils development team - for GNU Binutils, the basis of sdbinutils
Boost Community - for Boost C++ libraries used in sdcc compiler
Timo Bingmann - for STX B+ Tree C++ Template Classes used in sdcc compiler
Malini Dutta <malini.AT.mediaone.net> - Sandeep's wife, for her patience and support.

Past news

Jan 24th, 2020: SDCC 4.0.0 RC1 released.

SDCC 4.0.0 Release Candidate 1 source, doc and binary packages for amd64 GNU/Linux, 32 and 64 bit Windows and amd64 macOS are available in corresponding folders at: http://sourceforge.net/projects/sdcc/files/.

Apr 15th, 2019: SDCC 3.9.0 released.

SDCC 3.9.0 Feature List:

Support for struct / union assignment.
Optimizations in the stm8 backend relevant to soft float increase Whetstone score by two thirds.
Improvements in rematerialization in the stm8 backend improve code generation for struct, union and arrays.
New stack allocator reduces stack space usage for the stm8, z80, z180, gbz80, r2k, r3ka, tlcs90 backends.
New ez80_z80 backend for eZ80 in Z80 mode.
Removed deprecated sdcclib utility.
New pdk14 backend for Padauk µC with 14-bit wide program memory.
New in-development pdk15 backend for Padauk µC with 15-bit wide program memory.

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Numerous other new features and bug fixes are included as well.

You can download the release from:
https://sourceforge.net/projects/sdcc/files/

Apr 8th, 2019: SDCC 3.9.0 RC1 released.

SDCC 3.9.0 Release Candidate 1 source, doc and binary packages for amd64 GNU/Linux, 32 and 64 bit Windows and amd64 macOS are available in corresponding folders at: http://sourceforge.net/projects/sdcc/files/.

Sep 27th, 2018: SDCC 3.8.0 released.

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A new release of SDCC, the portable optimizing compiler for 8051, DS390, Z80, Z180, Rabbit 2000, GBZ80, TLCS-90, HC08, STM8 and PIC microprocessors is now available (http://sdcc.sourceforge.net). Sources, documentation and binaries for GNU/Linux amd64, Windows amd64, macOS amd64 and Windows x86 are available.

SDCC 3.8.0 Feature List:

Additional general utility function: bsearch().
Support for rematerialization in the stm8 backend reduces register pressure and stack usage.
Merged upstream GNU binutils 2.30
All Python code is now fully compatible with both Python 2.7 and Python 3.6, so Python 3 can be used instead of Python 2.
Regression testing for diagnostics.
Improved handling of local bool variables in the mcs51 backend substantially reduces code size.
Large memory model for stm8 for 24-bit codespace allows using more than 32KB of Flash for code.
New optimizations for calls to some standard library function (printf(), puts(), strcpy()).
The type of true and false from stdbool.h change from int to bool.
New C2X mode (--std-c2x, --std-sdcc2x, #pragma std_c2x) adds support for one-argument static_assert variant.
Intermingling of declarations and statements (ISO C99).
Support headers for AX8052 devices.
Adopted GCC 8.2 regression tests (execute part of the GCC C torture tests).

Numerous other new features and bug fixes are included as well.