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=====================================
Introducing the Open Watcom Compilers
=====================================
Jeffrey Armstrong
https://github.com/open-watcom
25 October 2014
.. note::
* Ask who cross-compiles
Introduction
============
.. rst-class:: build
* C, C++, and Fortran 77 Compilers
* Runtime Libraries
* Assembler
* Make Utility
* Integrated Development Environment
* Text and Graphical Debuggers
.. note::
* Introduce compilers, but then say "so much more"
History
=======
* Originally commercial
* Popular during MS-DOS's heyday
* Released as "open-source" in 2003
.. note::
* Explain license
History
=======
* 2003 - Sybase releases OW as open-source
* 2003 - Ensure OW builds itself
* 2005 - x86 Linux support added
* 2009 - Independent Windows API implemented
* 2012 - 2.0 fork begins
* x64 support
* Improved C99 support
* Work towards complete STL
Compiler Capabilities
=====================
.. rst-class:: build
* x86 (and recently x64) Code Generators
* 16-bit, 32-bit, and 64-bit
* Some limitations on C++ compiler
* Complete support for fixed-format Fortran
* Cross-compiling
Compiler Hosts/Targets
======================
.. rst-class:: build
* MS-DOS / Windows3.x / Win32
* Windows NT
* OS/2
* Netware :sup:`1`
* x86/x64 Linux
* RDOS :sup:`1`
:sup:`1` Target only
Compiler Architecture
=====================
* Language-specific front end
* Architecture-specific back end
* Single executables
* No intermediate files
C Runtime Libraries
===================
* Independent implementations
* C89 complete
* Partial C99
* Common "legacy" extensions
C++ Runtime Libraries
=====================
* C++98 mostly complete
* Independent STL implementation
* About 50% complete
* Supports 16-bit compilers
Fortran Runtime Libraries
=========================
* Complete Fortran 77 intrinsic support
* Odd Open Watcom extensions
* No Cray pointer support
Make Utility
============
* Complete "make" utility
* File-based
* Works on all supported hosts
.. note::
* Useful for DOS and Windows developers
Integrated Dev Environment
==========================
* Cross-platform IDE
* Supports Win3.x/9x, OS/2, WinNT
* Ugly but functional
* Some interest in GTK+ port, but...
.. note::
* Mention port can't proceed because of a shortcoming
Debuggers
=========
* Text-mode on all supported hosts
* GUI on Win3.x/9x, OS/2, WinNT
* Supports DWARF, CodeView, and Watcom debugging symbols
Project Summary
===============
* Substantially complex
* Complete development toolchain
Using Open Watcom
=================
* Getting Open Watcom
* https://github.com/open-watcom
* http://tx0.org/1r (Sourceforge)
* http://buildbot.approximatrix.com/
Using Open Watcom
=================
* Environment Variables:
.. code-block:: sh
WATCOM=<install directory>
INCLUDE=$WATCOM/lh
PATH=$WATCOM/binl:$PATH
Performance
===========
Whetstone - C
.. figure:: _static/whetstone.svg
Performance - MDBNCH
====================
MDBNCH - Fortran 77
.. figure:: _static/mdbnch.svg
Performance - Building Python
=============================
Building the Python Interpreter
.. figure:: _static/python.svg
Performance - Building Python
=============================
Building the Python Interpreter Take 2
.. figure:: _static/python_no_sre.svg
What Needs Work
===============
.. rst-class:: build
* C++ compiler
* Lazy instantiation
* STL completion
* Windows API
* GNU/Linux shared libraries
* More testing
Contact
=======
* Email: **jeff@rainbow-100.com**
* Twitter: **@fortranjeff**
* Github & BitBucket: **ArmstrongJ**
* Web: **http://jeff.rainbow-100.com/**
* Slides: **http://jeff.rainbow-100.com/other/olf/index.html**
Open Watcom
===========
https://github.com/open-watcom
.. figure:: _static/ow-qr.png
:width: 500px
:align: center
|
