122 lines
5.1 KiB
HTML
122 lines
5.1 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using the GNU Compiler Collection (GCC): Enumerator Attributes</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): Enumerator Attributes">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Enumerator Attributes">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="C-Extensions.html#C-Extensions" rel="up" title="C Extensions">
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<link href="Attribute-Syntax.html#Attribute-Syntax" rel="next" title="Attribute Syntax">
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<link href="Label-Attributes.html#Label-Attributes" rel="prev" title="Label Attributes">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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span.sansserif {font-family:sans-serif; font-weight:normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Enumerator-Attributes"></a>
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<div class="header">
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<p>
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Next: <a href="Attribute-Syntax.html#Attribute-Syntax" accesskey="n" rel="next">Attribute Syntax</a>, Previous: <a href="Label-Attributes.html#Label-Attributes" accesskey="p" rel="prev">Label Attributes</a>, Up: <a href="C-Extensions.html#C-Extensions" accesskey="u" rel="up">C Extensions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Enumerator-Attributes-1"></a>
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<h3 class="section">6.35 Enumerator Attributes</h3>
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<a name="index-Enumerator-Attributes"></a>
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<p>GCC allows attributes to be set on enumerators. See <a href="Attribute-Syntax.html#Attribute-Syntax">Attribute Syntax</a>, for
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details of the exact syntax for using attributes. Other attributes are
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available for functions (see <a href="Function-Attributes.html#Function-Attributes">Function Attributes</a>), variables
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(see <a href="Variable-Attributes.html#Variable-Attributes">Variable Attributes</a>), labels (see <a href="Label-Attributes.html#Label-Attributes">Label Attributes</a>),
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and for types (see <a href="Type-Attributes.html#Type-Attributes">Type Attributes</a>).
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</p>
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<p>This example uses the <code>deprecated</code> enumerator attribute to indicate the
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<code>oldval</code> enumerator is deprecated:
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</p>
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<div class="smallexample">
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<pre class="smallexample">enum E {
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oldval __attribute__((deprecated)),
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newval
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};
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int
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fn (void)
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{
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return oldval;
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}
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</pre></div>
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<dl compact="compact">
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<dt><code>deprecated</code></dt>
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<dd><a name="index-deprecated-enumerator-attribute"></a>
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<p>The <code>deprecated</code> attribute results in a warning if the enumerator
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is used anywhere in the source file. This is useful when identifying
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enumerators that are expected to be removed in a future version of a
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program. The warning also includes the location of the declaration
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of the deprecated enumerator, to enable users to easily find further
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information about why the enumerator is deprecated, or what they should
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do instead. Note that the warnings only occurs for uses.
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</p>
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</dd>
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</dl>
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</body>
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</html>
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