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<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright &copy; 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.   <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below).  A copy of the license isincluded in the section entitled "GNU Free Documentation License".   <p>(a) The FSF's Front-Cover Text is:   <p>A GNU Manual   <p>(b) The FSF's Back-Cover Text is:   <p>You have freedom to copy and modify this GNU Manual, like GNU     software.  Copies published by the Free Software Foundation raise     funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!--  pre.display { font-family:inherit }  pre.format  { font-family:inherit }  pre.smalldisplay { font-family:inherit; font-size:smaller }  pre.smallformat  { font-family:inherit; font-size:smaller }  pre.smallexample { font-size:smaller }  pre.smalllisp    { font-size:smaller }--></style></head><body><div class="node"><p>Node:&nbsp;<a name="Structures%20unions%20enumerations%20and%20bit-fields%20implementation">Structures unions enumerations and bit-fields implementation</a>,Next:&nbsp;<a rel="next" accesskey="n" href="Qualifiers-implementation.html#Qualifiers%20implementation">Qualifiers implementation</a>,Previous:&nbsp;<a rel="previous" accesskey="p" href="Hints-implementation.html#Hints%20implementation">Hints implementation</a>,Up:&nbsp;<a rel="up" accesskey="u" href="C-Implementation.html#C%20Implementation">C Implementation</a><hr><br></div><h3 class="section">Structures, unions, enumerations, and bit-fields</h3>     <ul><li><cite>Whether a "plain" int bit-field is treated as a </cite><code>signed int</code><cite>bit-field or as an </cite><code>unsigned int</code><cite> bit-field (6.7.2, 6.7.2.1).</cite>     <li><cite>Allowable bit-field types other than </cite><code>_Bool</code><cite>, </cite><code>signed int</code><cite>,and </cite><code>unsigned int</code><cite> (6.7.2.1).</cite>     <li><cite>Whether a bit-field can straddle a storage-unit boundary (6.7.2.1).</cite>     <li><cite>The order of allocation of bit-fields within a unit (6.7.2.1).</cite>     <li><cite>The alignment of non-bit-field members of structures (6.7.2.1).</cite>     <li><cite>The integer type compatible with each enumerated type (6.7.2.2).</cite></ul>   </body></html>

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