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Node:<a name="Simple%20Assignments">Simple Assignments</a>,

Next:<a rel="next" accesskey="n" href="PROVIDE.html#PROVIDE">PROVIDE</a>,

Up:<a rel="up" accesskey="u" href="Assignments.html#Assignments">Assignments</a>

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<h4 class="subsection">Simple Assignments</h4>



   <p>You may assign to a symbol using any of the C assignment operators:



     <dl>

<dt><code></code><var>symbol</var><code> = </code><var>expression</var><code> ;</code>

     <dd><dt><code></code><var>symbol</var><code> += </code><var>expression</var><code> ;</code>

     <dd><dt><code></code><var>symbol</var><code> -= </code><var>expression</var><code> ;</code>

     <dd><dt><code></code><var>symbol</var><code> *= </code><var>expression</var><code> ;</code>

     <dd><dt><code></code><var>symbol</var><code> /= </code><var>expression</var><code> ;</code>

     <dd><dt><code></code><var>symbol</var><code> &lt;&lt;= </code><var>expression</var><code> ;</code>

     <dd><dt><code></code><var>symbol</var><code> &gt;&gt;= </code><var>expression</var><code> ;</code>

     <dd><dt><code></code><var>symbol</var><code> &amp;= </code><var>expression</var><code> ;</code>

     <dd><dt><code></code><var>symbol</var><code> |= </code><var>expression</var><code> ;</code>

     <dd></dl>



   <p>The first case will define <var>symbol</var> to the value of

<var>expression</var>.  In the other cases, <var>symbol</var> must already be

defined, and the value will be adjusted accordingly.



   <p>The special symbol name <code>.</code> indicates the location counter.  You

may only use this within a <code>SECTIONS</code> command.



   <p>The semicolon after <var>expression</var> is required.



   <p>Expressions are defined below; see <a href="Expressions.html#Expressions">Expressions</a>.



   <p>You may write symbol assignments as commands in their own right, or as

statements within a <code>SECTIONS</code> command, or as part of an output

section description in a <code>SECTIONS</code> command.



   <p>The section of the symbol will be set from the section of the

expression; for more information, see <a href="Expression-Section.html#Expression%20Section">Expression Section</a>.



   <p>Here is an example showing the three different places that symbol

assignments may be used:



<pre class="smallexample">     floating_point = 0;

     SECTIONS

     {

       .text :

         {

           *(.text)

           _etext = .;

         }

       _bdata = (. + 3) &amp; ~ 3;

       .data : { *(.data) }

     }

     </pre>



<p>In this example, the symbol <code>floating_point</code> will be defined as

zero.  The symbol <code>_etext</code> will be defined as the address following

the last <code>.text</code> input section.  The symbol <code>_bdata</code> will be

defined as the address following the <code>.text</code> output section aligned

upward to a 4 byte boundary.



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