<s>
Watcom	B-Application
C/C	I-Application
++	I-Application
(	O
currently	O
Open	B-Application
Watcom	I-Application
C/C	I-Application
++	I-Application
)	O
is	O
an	O
integrated	B-Application
development	I-Application
environment	I-Application
(	O
IDE	B-Application
)	O
product	O
from	O
Watcom	O
International	O
Corporation	O
for	O
the	O
C	B-Language
,	O
C++	B-Language
,	O
and	O
Fortran	B-Application
programming	I-Application
languages	I-Application
.	O
</s>
<s>
Watcom	B-Application
C/C	I-Application
++	I-Application
was	O
a	O
commercial	O
product	O
until	O
it	O
was	O
discontinued	O
,	O
then	O
released	O
under	O
the	O
Sybase	B-Application
Open	B-Application
Watcom	I-Application
Public	O
License	O
as	O
Open	B-Application
Watcom	I-Application
C/C	I-Application
++	I-Application
.	O
</s>
<s>
It	O
features	O
tools	O
for	O
developing	O
and	O
debugging	O
code	O
for	O
DOS	B-Device
,	O
OS/2	B-Application
,	O
Windows	B-Application
,	O
Linux	B-Application
operating	I-Application
systems	I-Application
,	O
which	O
are	O
based	O
upon	O
x86	B-Operating_System
,	O
IA-32	B-Device
,	O
x86-64	B-Device
compatible	O
processors	O
.	O
</s>
<s>
Though	O
no	O
longer	O
sold	O
commercially	O
by	O
Sybase	B-Application
,	O
the	O
Watcom	B-Application
C/C	I-Application
++	I-Application
compiler	I-Application
and	O
the	O
Watcom	O
Fortran	B-Application
compiler	O
have	O
been	O
made	O
available	O
free	O
of	O
charge	O
as	O
the	O
Open	B-Application
Watcom	I-Application
package	O
.	O
</s>
<s>
A	O
forked	B-Application
version	O
2.0	O
beta	O
was	O
released	O
that	O
supports	O
64-bit	O
hosts	O
(	O
Windows	B-Application
and	O
Linux	B-Application
)	O
,	O
built-in	O
text	O
editor	O
,	O
2-phase	O
build	O
system	O
,	O
and	O
the	O
DOS	B-Device
version	O
supports	O
long	O
filenames	O
(	O
LFN	O
)	O
.	O
</s>
<s>
The	O
Open	B-Application
Watcom	I-Application
Wiki	O
has	O
a	O
comprehensive	O
history	O
.	O
</s>
<s>
GitHub	B-Application
V2	O
fork	B-Application
,	O
numerous	O
fixesList	O
of	O
main	O
differences	O
of	O
v1.9	O
to	O
v2.0	O
Beta	O
.	O
</s>
<s>
The	O
Open	O
Source	O
Initiative	O
has	O
approved	O
the	O
license	O
as	O
open	O
source	O
,	O
but	O
Debian	O
,	O
Fedora	O
and	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
have	O
rejected	O
it	O
because	O
"	O
It	O
requires	O
you	O
to	O
publish	O
the	O
source	O
code	O
publicly	O
whenever	O
you	O
“	O
Deploy	O
”	O
the	O
covered	O
software	O
,	O
and	O
“	O
Deploy	O
”	O
is	O
defined	O
to	O
include	O
many	O
kinds	O
of	O
private	O
use.	O
"	O
</s>
<s>
The	O
compiler	O
can	O
be	O
operated	O
from	O
,	O
and	O
generate	O
executable	O
code	O
for	O
,	O
the	O
DOS	B-Device
,	O
OS/2	B-Application
,	O
Windows	B-Application
,	O
Linux	B-Application
operating	I-Application
systems	I-Application
.	O
</s>
<s>
It	O
also	O
supports	O
NLM	B-Application
targets	O
for	O
Novell	B-Operating_System
NetWare	I-Operating_System
.	O
</s>
<s>
There	O
is	O
ongoing	O
work	O
to	O
extend	O
the	O
targeting	O
to	O
Linux	B-Application
and	O
modern	O
BSD	B-Operating_System
(	O
e.g.	O
,	O
FreeBSD	B-Operating_System
)	O
operating	B-General_Concept
systems	I-General_Concept
,	O
running	O
on	O
x86	B-Operating_System
,	O
PowerPC	B-Architecture
,	O
and	O
other	O
processors	O
.	O
</s>
<s>
The	O
code	O
is	O
portable	O
and	O
,	O
like	O
many	O
other	O
open	O
source	O
compiler	O
projects	O
such	O
as	O
GCC	B-Application
or	O
LCC	B-Language
the	O
compiler	O
backend	O
(	O
code	O
generator	O
)	O
is	O
retargetable	O
.	O
</s>
<s>
In	O
the	O
mid-1990s	O
some	O
of	O
the	O
most	O
technically	O
ambitious	O
DOS	B-Device
computer	O
games	O
such	O
as	O
Doom	B-Application
,	O
Descent	B-Application
,	O
Duke	B-Application
Nukem	I-Application
3D	I-Application
,	O
Rise	B-Application
of	I-Application
the	I-Application
Triad	I-Application
,	O
and	O
Tomb	B-Application
Raider	I-Application
were	O
built	O
using	O
Watcom	B-Application
C/C	I-Application
++	I-Application
using	O
the	O
DOS/4GW	B-Application
protected	B-Application
mode	I-Application
extender	O
with	O
the	O
Watcom	O
compiler	O
.	O
</s>
<s>
It	O
was	O
used	O
to	O
port	O
the	O
game	O
Retro	B-Application
City	I-Application
Rampage	I-Application
to	O
DOS	B-Device
in	O
2015	O
.	O
</s>
<s>
It	O
is	O
used	O
by	O
VirtualBox	B-Operating_System
to	O
compile	O
the	O
BIOS	B-Operating_System
.	O
</s>
<s>
Current	O
development	O
for	O
FreeDOS	B-Application
requires	O
that	O
all	O
C	B-Language
source	O
code	O
must	O
be	O
compilable	O
by	O
Open	B-Application
Watcom	I-Application
C	B-Language
.	O
</s>
<s>
Open	B-Application
Watcom	I-Application
is	O
the	O
recommended	O
compiler	O
for	O
application	O
and	O
driver	O
development	O
for	O
the	O
OS/2	B-Application
-based	O
ArcaOS	B-Device
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
There	O
is	O
an	O
unofficial	O
fork	B-Application
of	O
Open	B-Application
Watcom	I-Application
V2	O
on	O
GitHub	B-Application
.	O
</s>
<s>
A	O
variant	O
of	O
the	O
16bit	O
DOS	B-Device
CRT	O
library	O
startup	O
was	O
created	O
with	O
WASM	B-Application
.	O
</s>
<s>
Open	B-Application
Watcom	I-Application
's	O
syntax	O
supports	O
many	O
conventions	O
introduced	O
by	O
other	O
compilers	O
,	O
such	O
as	O
Microsoft	O
's	O
and	O
Borland	O
's	O
,	O
including	O
differing	O
conventions	O
regarding	O
(	O
for	O
instance	O
)	O
the	O
number	O
of	O
leading	O
underscores	O
on	O
the	O
"	O
asm	O
"	O
tag	O
.	O
</s>
<s>
Code	O
written	O
specifically	O
for	O
another	O
compiler	O
rather	O
than	O
standard-compliant	O
C	B-Language
or	O
C++	B-Language
will	O
often	O
compile	O
with	O
the	O
Watcom	O
compiler	O
.	O
</s>
<s>
Open	B-Application
Watcom	I-Application
supports	O
partial	O
compatibility	O
with	O
the	O
C99	B-Language
standard	I-Language
.	O
</s>
<s>
Three	O
C99	B-Language
features	O
have	O
been	O
bundled	O
as	O
C90	O
Extension	O
since	O
pre-v1.0	O
:	O
C++	B-Language
style	O
comments	O
(//	O
)	O
,	O
flexible	O
array	O
members	O
,	O
trailing	O
comma	O
allowed	O
in	O
enum	O
declaration	O
.	O
</s>
<s>
The	O
compiler	O
currently	O
does	O
n't	O
support	O
any	O
new	O
major	O
C11	O
features	O
,	O
though	O
the	O
C	B-Language
library	O
does	O
include	O
"	O
Safe	O
C	B-Language
"	O
functions	O
.	O
</s>
<s>
This	O
library	O
was	O
released	O
along	O
with	O
Open	B-Application
Watcom	I-Application
1.5	O
in	O
April	O
2006	O
.	O
</s>
