PEP: 11 Title: Removing support for little used platforms Version: $Revision$ Last-Modified: $Date$ Author: martin@v.loewis.de (Martin von Löwis) Status: Active Type: Process Created: 07-Jul-2002 Post-History: 18-Aug-2007 Abstract This PEP documents operating systems (platforms) which are not supported in Python anymore. For some of these systems, supporting code might be still part of Python, but will be removed in a future release - unless somebody steps forward as a volunteer to maintain this code. Rationale Over time, the Python source code has collected various pieces of platform-specific code, which, at some point in time, was considered necessary to use Python on a specific platform. Without access to this platform, it is not possible to determine whether this code is still needed. As a result, this code may either break during the Python evolution, or it may become unnecessary as the platforms evolve as well. The growing amount of these fragments poses the risk of unmaintainability: without having experts for a large number of platforms, it is not possible to determine whether a certain change to the Python source code will work on all supported platforms. To reduce this risk, this PEP proposes a procedure to remove code for platforms with no Python users. Unsupporting platforms If a certain platform that currently has special code in it is deemed to be without Python users, a note must be posted in this PEP that this platform is no longer actively supported. This note must include: - the name of the system - the first release number that does not support this platform anymore, and - the first release where the historical support code is actively removed In some cases, it is not possible to identify the specific list of systems for which some code is used (e.g. when autoconf tests for absence of some feature which is considered present on all supported systems). In this case, the name will give the precise condition (usually a preprocessor symbol) that will become unsupported. At the same time, the Python source code must be changed to produce a build-time error if somebody tries to install Python on this platform. On platforms using autoconf, configure must fail. This gives potential users of the platform a chance to step forward and offer maintenance. Resupporting platforms If a user of a platform wants to see this platform supported again, he may volunteer to maintain the platform support. Such an offer must be recorded in the PEP, and the user can submit patches to remove the build-time errors, and perform any other maintenance work for the platform. No-longer-supported platforms Name: MS-DOS, MS-Windows 3.x Unsupported in: Python 2.0 Code removed in: Python 2.1 Name: SunOS 4 Unsupported in: Python 2.3 Code removed in: Python 2.4 Name: DYNIX Unsupported in: Python 2.3 Code removed in: Python 2.4 Name: dgux Unsupported in: Python 2.3 Code removed in: Python 2.4 Name: Minix Unsupported in: Python 2.3 Code removed in: Python 2.4 Name: Irix 4 and --with-sgi-dl Unsupported in: Python 2.3 Code removed in: Python 2.4 Name: Linux 1 Unsupported in: Python 2.3 Code removed in: Python 2.4 Name: Systems defining __d6_pthread_create (configure.in) Unsupported in: Python 2.3 Code removed in: Python 2.4 Name: Systems defining PY_PTHREAD_D4, PY_PTHREAD_D6, or PY_PTHREAD_D7 in thread_pthread.h Unsupported in: Python 2.3 Code removed in: Python 2.4 Name: Systems using --with-dl-dld Unsupported in: Python 2.3 Code removed in: Python 2.4 Name: Systems using --without-universal-newlines, Unsupported in: Python 2.3 Code removed in: Python 2.4 Name: MacOS 9 Unsupported in: Python 2.4 Code removed in: Python 2.4 Name: Systems using --with-wctype-functions Unsupported in: Python 2.6 Code removed in: Python 2.6 Name: Win9x, WinME, NT4 Unsupported in: Python 2.6 (warning in 2.5 installer) Code removed in: Python 2.6 Name: AtheOS Unsupported in: Python 2.6 (with "AtheOS" changed to "Syllable") Build broken in: Python 2.7 (edit configure to reenable) Code removed in: Python 3.0 Details: http://www.syllable.org/discussion.php?id=2320 Name: BeOS Unsupported in: Python 2.6 (warning in configure) Build broken in: Python 2.7 (edit configure to reenable) Code removed in: Python 3.0 Name: Systems using Mach C Threads Unsupported in: Python 3.2 Code removed in: Python 3.3 Name: SunOS lightweight processes (LWP) Unsupported in: Python 3.2 Code removed in: Python 3.3 Name: Systems using --with-pth (GNU pth threads) Unsupported in: Python 3.2 Code removed in: Python 3.3 Name: Systems using Irix threads Unsupported in: Python 3.2 Code removed in: Python 3.3 Name: OSF* systems (issue 8606) Unsupported in: Python 3.2 Code removed in: Python 3.3 Platform Maintainers Cygwin Jason Tishler (jason@tishler.net) OS2/EMX Andrew MacIntyre (andymac@bullseye.apana.org.au) More TBD. 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