1<html lang="en"> 2<head> 3<title>Darwin Pragmas - Using the GNU Compiler Collection (GCC)</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Using the GNU Compiler Collection (GCC)"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Pragmas.html#Pragmas" title="Pragmas"> 9<link rel="prev" href="RS_002f6000-and-PowerPC-Pragmas.html#RS_002f6000-and-PowerPC-Pragmas" title="RS/6000 and PowerPC Pragmas"> 10<link rel="next" href="Solaris-Pragmas.html#Solaris-Pragmas" title="Solaris Pragmas"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<!-- 13Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 141998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 152010 Free Software Foundation, Inc. 16 17Permission is granted to copy, distribute and/or modify this document 18under the terms of the GNU Free Documentation License, Version 1.3 or 19any later version published by the Free Software Foundation; with the 20Invariant Sections being ``Funding Free Software'', the Front-Cover 21Texts being (a) (see below), and with the Back-Cover Texts being (b) 22(see below). A copy of the license is included in the section entitled 23``GNU Free Documentation License''. 24 25(a) The FSF's Front-Cover Text is: 26 27 A GNU Manual 28 29(b) The FSF's Back-Cover Text is: 30 31 You have freedom to copy and modify this GNU Manual, like GNU 32 software. Copies published by the Free Software Foundation raise 33 funds for GNU development.--> 34<meta http-equiv="Content-Style-Type" content="text/css"> 35<style type="text/css"><!-- 36 pre.display { font-family:inherit } 37 pre.format { font-family:inherit } 38 pre.smalldisplay { font-family:inherit; font-size:smaller } 39 pre.smallformat { font-family:inherit; font-size:smaller } 40 pre.smallexample { font-size:smaller } 41 pre.smalllisp { font-size:smaller } 42 span.sc { font-variant:small-caps } 43 span.roman { font-family:serif; font-weight:normal; } 44 span.sansserif { font-family:sans-serif; font-weight:normal; } 45--></style> 46<link rel="stylesheet" type="text/css" href="../cs.css"> 47</head> 48<body> 49<div class="node"> 50<a name="Darwin-Pragmas"></a> 51<p> 52Next: <a rel="next" accesskey="n" href="Solaris-Pragmas.html#Solaris-Pragmas">Solaris Pragmas</a>, 53Previous: <a rel="previous" accesskey="p" href="RS_002f6000-and-PowerPC-Pragmas.html#RS_002f6000-and-PowerPC-Pragmas">RS/6000 and PowerPC Pragmas</a>, 54Up: <a rel="up" accesskey="u" href="Pragmas.html#Pragmas">Pragmas</a> 55<hr> 56</div> 57 58<h4 class="subsection">6.56.5 Darwin Pragmas</h4> 59 60<p>The following pragmas are available for all architectures running the 61Darwin operating system. These are useful for compatibility with other 62Mac OS compilers. 63 64 <dl> 65<dt><code>mark </code><var>tokens</var><code>...</code><dd><a name="index-pragma_002c-mark-3225"></a>This pragma is accepted, but has no effect. 66 67 <br><dt><code>options align=</code><var>alignment</var><dd><a name="index-pragma_002c-options-align-3226"></a>This pragma sets the alignment of fields in structures. The values of 68<var>alignment</var> may be <code>mac68k</code>, to emulate m68k alignment, or 69<code>power</code>, to emulate PowerPC alignment. Uses of this pragma nest 70properly; to restore the previous setting, use <code>reset</code> for the 71<var>alignment</var>. 72 73 <br><dt><code>segment </code><var>tokens</var><code>...</code><dd><a name="index-pragma_002c-segment-3227"></a>This pragma is accepted, but has no effect. 74 75 <br><dt><code>unused (</code><var>var</var><code> [, </code><var>var</var><code>]...)</code><dd><a name="index-pragma_002c-unused-3228"></a>This pragma declares variables to be possibly unused. GCC will not 76produce warnings for the listed variables. The effect is similar to 77that of the <code>unused</code> attribute, except that this pragma may appear 78anywhere within the variables' scopes. 79</dl> 80 81 </body></html> 82 83