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-<html>
-<head>
-    <title>libsm : C Language Portability Macros</title>
-</head>
-<body>
-
-<a href="index.html">Back to libsm overview</a>
-
-<center>
-    <h1> libsm : C Language Portability Macros </h1>
-    <br> $Id: cdefs.html,v 1.2 2000/12/07 17:33:09 dmoen Exp $
-</center>
-
-<h2> Description </h2>
-
-The header file <tt>&lt;sm/cdefs.h&gt;</tt>
-defines portable interfaces to non-portable features
-of various C compilers.
-It also assists you in writing C header files that are compatible
-with C++.
-
-<dl>
-<dt>
-<tt> __P(parameterlist) </tt>
-<dd>
-    This macro is used to write portable function prototypes.
-    For example,
-
-<blockquote><pre>
-int foo __P((int));
-</pre></blockquote>
-
-<dt>
-<tt> __CONCAT(x,y) </tt>
-<dd>
-    This macro concatenates two tokens x and y,
-    forming a single token xy.
-    Warning: make sure there is no white space around the arguments x and y.
-    <p>
-
-<dt>
-<tt> __STRING(x) </tt>
-<dd>
-    This macro converts the token sequence x into a string literal.
-    <p>
-
-<dt>
-<tt> __BEGIN_DECLS, __END_DECLS </tt>
-<dd>
-    These macros are used to write C header files that are compatible
-    with C++ compilers.
-    Put <tt>__BEGIN_DECLS</tt> before the first function or variable
-    declaration in your header file,
-    and put <tt>__END_DECLS</tt> after the last function or variable
-    declaration.
-    <p>
-
-<dt>
-<tt> const, signed, volatile </tt>
-<dd>
-    For pre-ANSI C compilers, <tt>const</tt>, <tt>signed</tt>
-    and <tt>volatile</tt> are defined as empty macros.
-    This means you can use these keywords without introducing
-    portability problems.
-    <p>
-
-<dt>
-<tt> SM_DEAD(function_declaration) </tt>
-<dd>
-    This macro modifies a prototype of a function
-    that does not return to its caller.
-    With some versions of gcc, this will result in slightly better code,
-    and can suppress some useless warnings produced by gcc -Wall.
-    For example,
-
-<blockquote><pre>
-SM_DEAD(void exit __P((int)));
-</pre></blockquote>
-
-<dt>
-<tt> SM_UNUSED(variable_declaration) </tt>
-<dd>
-    This macro modifies a definition of an unused
-    local variable, global variable or function parameter
-    in order to suppress compiler warnings.
-    Examples:
-
-<blockquote><pre>
-SM_UNUSED(static const char Id[]) = "@(#)$Id: cdefs.html,v 1.2 2000/12/07 17:33:09 dmoen Exp $";
-void
-foo(x)
-	SM_UNUSED(int x);
-{
-	SM_UNUSED(int y) = 0;
-	return 0;
-}
-void
-bar(SM_UNUSED(int x))
-{
-	return 0;
-}
-</pre></blockquote>
-
-</dl>
-
-</body>
-</html>