| author | stechong |
| Wed, 20 Oct 2010 11:19:31 -0500 | |
| changeset 2165 | 2a7b5eccb0bc |
| parent 1641 | 2b3996fc09a1 |
| permissions | -rw-r--r-- |
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2b3996fc09a1
revised x86 compiler dates, graphics, CSS, and release notes
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"> |
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
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<head> |
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> |
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<meta http-equiv="Content-Style-Type" content="text/css" /> |
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<meta name="LASTUPDATED" content="06/17/05 11:09:43" /> |
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<title>options</title> |
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<link rel="StyleSheet" href="../../book.css" type="text/css"/> |
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</head> |
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<body> |
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<h3>options</h3> |
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<p> Specifies how to align struct and class data.</p> |
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<h5>Syntax</h5> |
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<p class="code">#pragma options align= alignment</p> |
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<h5>Parameter</h5> |
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<p class="code">alignment</p> |
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<blockquote> |
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<p>Specifies the boundary on which struct and class data is aligned in memory. Values for alignment range from 1 to 16, or use one of the following preset values:</p> |
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<table width="75%" border="0" cellpadding="2" cellspacing="0"> |
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<tr> |
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<th width="25%" scope="col">If alignment is …</th> |
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<th width="75%" scope="col">The compiler …</th> |
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</tr> |
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<tr> |
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<td class="code">mac68k</td> |
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<td>Aligns every field on a 2-byte boundaries, unless a field is only 1 byte long. This is the standard alignment for 68K Macintoshes.</td> |
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</tr> |
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<tr> |
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<td class="code">mac68k4byte</td> |
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<td>Aligns every field on 4-byte boundaries.</td> |
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</tr> |
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<tr> |
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<td class="code">power</td> |
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<td>Aligns every field on its natural boundary. This is the standard alignment for Power Macintoshes. For example, it aligns a character on a 1-byte boundary and a 16-bit integer on a 2-byte boundary. The compiler applies this alignment recursively to structured data and arrays containing structured data. So, for example, it aligns an array of structured types containing an 4-byte floating point member on an 4-byte boundary.</td> |
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</tr> |
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<tr> |
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<td class="code">native</td> |
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<td>Aligns every field using the standard alignment. It is equivalent to using mac68k for 68K Macintoshes and power for Power Macintoshes.</td> |
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</tr> |
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<tr> |
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<td class="code">packed</td> |
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<td>Aligns every field on a 1-byte boundary. It is not available in any panel. This alignment causes your code to crash or run slowly on many platforms. Use it with caution.</td> |
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</tr> |
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<tr> |
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<td class="code">reset</td> |
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<td>Resets to the value in the previous <span class="code">#pragma options align</span> statement. |
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<p class="note"><strong>NOTE</strong> There is a space between <span class="code">options</span> and <span class="code">align</span></p> |
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</td> |
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</tr> |
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</table> |
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</blockquote> |
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<h5>Targets</h5> |
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All platforms.<br /> |
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<h5>Remarks</h5> |
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This pragma corresponds to the Struct Alignment setting in the <Target> Processor or <Target> CodeGen panel. |
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<p></p> |
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<div id="footer">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. <br>License: <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a></div> |
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</body> |
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</html> |