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  25. <title>Variable Attributes (Using the GNU Compiler Collection (GCC))</title>

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  35. <link href="C-Extensions.html#C-Extensions" rel="up" title="C Extensions">

  36. <link href="Common-Variable-Attributes.html#Common-Variable-Attributes" rel="next" title="Common Variable Attributes">

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  70. <a name="Variable-Attributes"></a>

  71. <div class="header">

  72. <p>

  73. Next: <a href="Type-Attributes.html#Type-Attributes" accesskey="n" rel="next">Type Attributes</a>, Previous: <a href="Function-Attributes.html#Function-Attributes" accesskey="p" rel="prev">Function Attributes</a>, Up: <a href="C-Extensions.html#C-Extensions" accesskey="u" rel="up">C Extensions</a> &nbsp; [<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>

  74. </div>

  75. <hr>

  76. <a name="Specifying-Attributes-of-Variables"></a>

  77. <h3 class="section">6.34 Specifying Attributes of Variables</h3>

  78. <a name="index-attribute-of-variables"></a>

  79. <a name="index-variable-attributes"></a>

  80. 

  81. <p>The keyword <code>__attribute__</code> allows you to specify special properties

  82. of variables, function parameters, or structure, union, and, in C++, class

  83. members.  This <code>__attribute__</code> keyword is followed by an attribute

  84. specification enclosed in double parentheses.  Some attributes are currently

  85. defined generically for variables.  Other attributes are defined for

  86. variables on particular target systems.  Other attributes are available

  87. for functions (see <a href="Function-Attributes.html#Function-Attributes">Function Attributes</a>), labels (see <a href="Label-Attributes.html#Label-Attributes">Label Attributes</a>),

  88. enumerators (see <a href="Enumerator-Attributes.html#Enumerator-Attributes">Enumerator Attributes</a>), statements

  89. (see <a href="Statement-Attributes.html#Statement-Attributes">Statement Attributes</a>), and for types (see <a href="Type-Attributes.html#Type-Attributes">Type Attributes</a>).

  90. Other front ends might define more attributes

  91. (see <a href="C_002b_002b-Extensions.html#C_002b_002b-Extensions">Extensions to the C++ Language</a>).

  92. </p>

  93. <p>See <a href="Attribute-Syntax.html#Attribute-Syntax">Attribute Syntax</a>, for details of the exact syntax for using

  94. attributes.

  95. </p>

  96. <table class="menu" border="0" cellspacing="0">

  97. <tr><td align="left" valign="top">&bull; <a href="Common-Variable-Attributes.html#Common-Variable-Attributes" accesskey="1">Common Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  98. </td></tr>

  99. <tr><td align="left" valign="top">&bull; <a href="ARC-Variable-Attributes.html#ARC-Variable-Attributes" accesskey="2">ARC Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  100. </td></tr>

  101. <tr><td align="left" valign="top">&bull; <a href="AVR-Variable-Attributes.html#AVR-Variable-Attributes" accesskey="3">AVR Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  102. </td></tr>

  103. <tr><td align="left" valign="top">&bull; <a href="Blackfin-Variable-Attributes.html#Blackfin-Variable-Attributes" accesskey="4">Blackfin Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  104. </td></tr>

  105. <tr><td align="left" valign="top">&bull; <a href="H8_002f300-Variable-Attributes.html#H8_002f300-Variable-Attributes" accesskey="5">H8/300 Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  106. </td></tr>

  107. <tr><td align="left" valign="top">&bull; <a href="IA_002d64-Variable-Attributes.html#IA_002d64-Variable-Attributes" accesskey="6">IA-64 Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  108. </td></tr>

  109. <tr><td align="left" valign="top">&bull; <a href="M32R_002fD-Variable-Attributes.html#M32R_002fD-Variable-Attributes" accesskey="7">M32R/D Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  110. </td></tr>

  111. <tr><td align="left" valign="top">&bull; <a href="MeP-Variable-Attributes.html#MeP-Variable-Attributes" accesskey="8">MeP Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  112. </td></tr>

  113. <tr><td align="left" valign="top">&bull; <a href="Microsoft-Windows-Variable-Attributes.html#Microsoft-Windows-Variable-Attributes" accesskey="9">Microsoft Windows Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  114. </td></tr>

  115. <tr><td align="left" valign="top">&bull; <a href="MSP430-Variable-Attributes.html#MSP430-Variable-Attributes">MSP430 Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  116. </td></tr>

  117. <tr><td align="left" valign="top">&bull; <a href="Nvidia-PTX-Variable-Attributes.html#Nvidia-PTX-Variable-Attributes">Nvidia PTX Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  118. </td></tr>

  119. <tr><td align="left" valign="top">&bull; <a href="PowerPC-Variable-Attributes.html#PowerPC-Variable-Attributes">PowerPC Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  120. </td></tr>

  121. <tr><td align="left" valign="top">&bull; <a href="RL78-Variable-Attributes.html#RL78-Variable-Attributes">RL78 Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  122. </td></tr>

  123. <tr><td align="left" valign="top">&bull; <a href="V850-Variable-Attributes.html#V850-Variable-Attributes">V850 Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  124. </td></tr>

  125. <tr><td align="left" valign="top">&bull; <a href="x86-Variable-Attributes.html#x86-Variable-Attributes">x86 Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  126. </td></tr>

  127. <tr><td align="left" valign="top">&bull; <a href="Xstormy16-Variable-Attributes.html#Xstormy16-Variable-Attributes">Xstormy16 Variable Attributes</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">

  128. </td></tr>

  129. </table>

  130. 

  131. <hr>

  132. <div class="header">

  133. <p>

  134. Next: <a href="Type-Attributes.html#Type-Attributes" accesskey="n" rel="next">Type Attributes</a>, Previous: <a href="Function-Attributes.html#Function-Attributes" accesskey="p" rel="prev">Function Attributes</a>, Up: <a href="C-Extensions.html#C-Extensions" accesskey="u" rel="up">C Extensions</a> &nbsp; [<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>

  135. </div>

  136. 

  137. 

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  139. </body>

  140. </html>