<s>
Acorn	B-Device
C/C	I-Device
++	I-Device
is	O
a	O
set	O
of	O
C/C	O
++	O
programming	B-Application
tools	I-Application
for	O
use	O
under	O
the	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
The	O
tools	O
use	O
the	O
Norcroft	B-General_Concept
compiler	I-General_Concept
suite	I-General_Concept
and	O
were	O
authored	O
by	O
Codemist	O
and	O
Acorn	O
Computers	O
.	O
</s>
<s>
The	O
tools	O
provide	O
some	O
facilities	O
offered	O
by	O
a	O
fully	O
integrated	B-Application
development	I-Application
environment	I-Application
.	O
</s>
<s>
Acorn	O
included	O
a	O
copy	O
of	O
the	O
Norcroft	B-General_Concept
compiler	I-General_Concept
targeted	O
at	O
the	O
ARM	B-Architecture
architecture	I-Architecture
for	O
RISC	B-Operating_System
OS	I-Operating_System
in	O
the	O
following	O
development	O
software	O
.	O
</s>
<s>
Acorn	O
's	O
work	O
on	O
ANSI	O
C	B-Language
compilers	O
was	O
begun	O
around	O
1987	O
,	O
with	O
a	O
commercial	O
release	O
in	O
1988	O
for	O
its	O
Archimedes	B-Device
computer	O
.	O
</s>
<s>
and	O
Desktop	O
Assembler	B-Language
were	O
released	O
in	O
1991	O
.	O
</s>
<s>
Codemist	O
worked	O
primarily	O
on	O
the	O
ANSI	O
C	B-Language
standard	O
,	O
while	O
Acorn	O
concentrated	O
on	O
the	O
specifics	O
and	O
optimisation	O
for	O
the	O
ARM	O
.	O
</s>
<s>
The	O
tools	O
were	O
originally	O
developed	O
by	O
university	O
academics	O
Alan	O
Mycroft	O
and	O
Arthur	O
C	B-Language
Norman	O
of	O
Codemist	O
.	O
</s>
<s>
Their	O
development	O
was	O
taken	O
up	O
by	O
Acorn	O
and	O
subsequently	O
taken	O
over	O
by	O
Castle	O
Technology	O
,	O
who	O
later	O
added	O
the	O
lacking	O
C99	B-Language
support	O
.	O
</s>
<s>
In	O
early	O
2009	O
,	O
development	O
and	O
sales	O
of	O
the	O
tools	O
were	O
transferred	O
to	O
RISC	B-Operating_System
OS	I-Operating_System
Open	O
.	O
</s>
<s>
Subsequent	O
enhancements	O
have	O
included	O
adding	O
the	O
post-ARMv5	O
instructions	O
to	O
the	O
standalone	O
assembler	B-Language
tool	O
,	O
ObjAsm	O
,	O
and	O
code	O
generation	O
by	O
the	O
C	B-Language
compiler	O
to	O
use	O
those	O
instructions	O
where	O
natural	O
to	O
do	O
so	O
from	O
the	O
language	O
.	O
</s>
<s>
The	O
Norcroft	B-General_Concept
compiler	I-General_Concept
can	O
be	O
used	O
to	O
produce	O
modules	B-Application
,	O
as	O
well	O
as	O
compiling	O
parts	O
of	O
the	O
operating	B-General_Concept
system	I-General_Concept
itself	O
.	O
</s>
<s>
Before	O
beginning	O
development	O
of	O
the	O
Inform	B-Application
programming	I-Application
language	I-Application
,	O
Graham	O
Nelson	O
originally	O
used	O
to	O
develop	O
his	O
text	O
adventure	O
Curses	B-Application
.	O
</s>
<s>
The	O
suite	O
of	O
tools	O
is	O
currently	O
the	O
only	O
means	O
of	O
building	O
a	O
working	O
copy	O
of	O
,	O
although	O
it	O
is	O
ultimately	O
intended	O
that	O
this	O
will	O
also	O
be	O
possible	O
using	O
a	O
cross	B-Application
compiler	I-Application
,	O
e.g.	O
</s>
<s>
using	O
the	O
free	B-Application
software	I-Application
GCC	B-Application
system	O
.	O
</s>
