1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
=====================================
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 Capabilities
=====================
.. rst-class:: build
* Supported hosts/targets:
* 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
Performance
===========
Whetstone - C
Performance - MDBNCH
====================
Performance - Building Python
=============================
Shortcomings
============
Contact
=======
* Email: **jeff@rainbow-100.com**
* Twitter: **@fortranjeff**
* Github: **ArmstrongJ**
* Web: **http://jeff.rainbow-100.com/**
Open Watcom
===========
https://github.com/open-watcom
..figure:: /_static/ow-qr.png
|
