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+<title>Using the GNU Compiler Collection (GCC): Alignment</title>
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+Next: <a href="Inline.html#Inline" accesskey="n" rel="next">Inline</a>, Previous: <a href="Character-Escapes.html#Character-Escapes" accesskey="p" rel="previous">Character Escapes</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="Indices.html#Indices" title="Index" rel="index">Index</a>]</p>
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+<hr>
+<a name="Determining-the-Alignment-of-Functions_002c-Types-or-Variables"></a>
+<h3 class="section">6.44 Determining the Alignment of Functions, Types or Variables</h3>
+<a name="index-alignment"></a>
+<a name="index-type-alignment"></a>
+<a name="index-variable-alignment"></a>
+
+<p>The keyword <code>__alignof__</code> determines the alignment requirement of
+a function, object, or a type, or the minimum alignment usually required
+by a type.  Its syntax is just like <code>sizeof</code> and C11 <code>_Alignof</code>.
+</p>
+<p>For example, if the target machine requires a <code>double</code> value to be
+aligned on an 8-byte boundary, then <code>__alignof__ (double)</code> is 8.
+This is true on many RISC machines.  On more traditional machine
+designs, <code>__alignof__ (double)</code> is 4 or even 2.
+</p>
+<p>Some machines never actually require alignment; they allow references to any
+data type even at an odd address.  For these machines, <code>__alignof__</code>
+reports the smallest alignment that GCC gives the data type, usually as
+mandated by the target ABI.
+</p>
+<p>If the operand of <code>__alignof__</code> is an lvalue rather than a type,
+its value is the required alignment for its type, taking into account
+any minimum alignment specified by attribute <code>aligned</code>
+(see <a href="Common-Variable-Attributes.html#Common-Variable-Attributes">Common Variable Attributes</a>).  For example, after this
+declaration:
+</p>
+<div class="smallexample">
+<pre class="smallexample">struct foo { int x; char y; } foo1;
+</pre></div>
+
+<p>the value of <code>__alignof__ (foo1.y)</code> is 1, even though its actual
+alignment is probably 2 or 4, the same as <code>__alignof__ (int)</code>.
+It is an error to ask for the alignment of an incomplete type other
+than <code>void</code>.
+</p>
+<p>If the operand of the <code>__alignof__</code> expression is a function,
+the expression evaluates to the alignment of the function which may
+be specified by attribute <code>aligned</code> (see <a href="Common-Function-Attributes.html#Common-Function-Attributes">Common Function Attributes</a>).
+</p>
+
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