<s>
Embeddable	B-Language
Common	I-Language
Lisp	I-Language
(	O
ECL	O
)	O
is	O
a	O
small	O
implementation	O
of	O
the	O
ANSI	B-Language
Common	I-Language
Lisp	I-Language
programming	O
language	O
that	O
can	O
be	O
used	O
stand-alone	O
or	O
embedded	O
in	O
extant	O
applications	O
written	O
in	O
C	B-Language
.	O
It	O
creates	O
OS-native	O
executables	B-Application
and	O
libraries	O
(	O
i.e.	O
</s>
<s>
Executable	B-Application
and	O
Linkable	O
Format	O
(	O
ELF	O
)	O
files	O
on	O
unix	O
)	O
from	O
Common	B-Language
Lisp	I-Language
code	O
,	O
and	O
runs	O
on	O
most	O
platforms	O
that	O
support	O
a	O
C	B-Language
compiler	B-Language
.	O
</s>
<s>
It	O
is	O
distributed	O
as	O
free	B-Application
software	I-Application
under	O
a	O
GNU	B-Application
Lesser	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
2.1	O
+	O
.	O
</s>
<s>
It	O
includes	O
a	O
runtime	B-Device
system	I-Device
,	O
and	O
two	O
compilers	B-Language
,	O
a	O
bytecode	O
interpreter	O
allowing	O
applications	O
to	O
be	O
deployed	O
where	O
no	O
C	B-Language
compiler	B-Language
is	O
expected	O
,	O
and	O
an	O
intermediate	O
language	O
type	O
,	O
which	O
compiles	B-Language
Common	B-Language
Lisp	I-Language
to	O
C	B-Language
for	O
a	O
more	O
efficient	O
runtime	O
.	O
</s>
<s>
The	O
latter	O
also	O
features	O
a	O
native	O
foreign	B-Application
function	I-Application
interface	I-Application
(	O
FFI	O
)	O
,	O
that	O
supports	O
inline	O
C	B-Language
as	O
part	O
of	O
Common	B-Language
Lisp	I-Language
.	O
</s>
<s>
Inline	O
C	B-Language
FFI	O
combined	O
with	O
Common	B-Language
Lisp	I-Language
macros	O
,	O
custom	O
Lisp	B-Language
setf	O
expansions	O
and	O
compiler-macros	O
,	O
result	O
in	O
a	O
custom	O
compile-time	O
C	B-Language
preprocessor	B-General_Concept
.	O
</s>
