140 lines
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140 lines
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HTML
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<title>Using the GNU Compiler Collection (GCC): Function Specific Option Pragmas</title>
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Pragmas.html#Pragmas" rel="up" title="Pragmas">
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<link href="Loop_002dSpecific-Pragmas.html#Loop_002dSpecific-Pragmas" rel="next" title="Loop-Specific Pragmas">
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<a name="Function-Specific-Option-Pragmas"></a>
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<p>
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Next: <a href="Loop_002dSpecific-Pragmas.html#Loop_002dSpecific-Pragmas" accesskey="n" rel="next">Loop-Specific Pragmas</a>, Previous: <a href="Push_002fPop-Macro-Pragmas.html#Push_002fPop-Macro-Pragmas" accesskey="p" rel="prev">Push/Pop Macro Pragmas</a>, Up: <a href="Pragmas.html#Pragmas" accesskey="u" rel="up">Pragmas</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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<a name="Function-Specific-Option-Pragmas-1"></a>
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<h4 class="subsection">6.61.15 Function Specific Option Pragmas</h4>
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<dl compact="compact">
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<dt><code>#pragma GCC target (<var>"string"</var>...)</code></dt>
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<dd><a name="index-pragma-GCC-target"></a>
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<p>This pragma allows you to set target specific options for functions
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defined later in the source file. One or more strings can be
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specified. Each function that is defined after this point is as
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if <code>attribute((target("STRING")))</code> was specified for that
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function. The parenthesis around the options is optional.
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See <a href="Function-Attributes.html#Function-Attributes">Function Attributes</a>, for more information about the
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<code>target</code> attribute and the attribute syntax.
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</p>
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<p>The <code>#pragma GCC target</code> pragma is presently implemented for
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x86, PowerPC, and Nios II targets only.
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</p></dd>
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</dl>
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<dl compact="compact">
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<dt><code>#pragma GCC optimize (<var>"string"</var>...)</code></dt>
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<dd><a name="index-pragma-GCC-optimize"></a>
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<p>This pragma allows you to set global optimization options for functions
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defined later in the source file. One or more strings can be
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specified. Each function that is defined after this point is as
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if <code>attribute((optimize("STRING")))</code> was specified for that
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function. The parenthesis around the options is optional.
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See <a href="Function-Attributes.html#Function-Attributes">Function Attributes</a>, for more information about the
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<code>optimize</code> attribute and the attribute syntax.
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</p></dd>
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</dl>
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<dl compact="compact">
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<dt><code>#pragma GCC push_options</code></dt>
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<dt><code>#pragma GCC pop_options</code></dt>
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<dd><a name="index-pragma-GCC-push_005foptions"></a>
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<a name="index-pragma-GCC-pop_005foptions"></a>
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<p>These pragmas maintain a stack of the current target and optimization
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options. It is intended for include files where you temporarily want
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to switch to using a different ‘<samp>#pragma GCC target</samp>’ or
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‘<samp>#pragma GCC optimize</samp>’ and then to pop back to the previous
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options.
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</p></dd>
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</dl>
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<dl compact="compact">
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<dt><code>#pragma GCC reset_options</code></dt>
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<dd><a name="index-pragma-GCC-reset_005foptions"></a>
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<p>This pragma clears the current <code>#pragma GCC target</code> and
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<code>#pragma GCC optimize</code> to use the default switches as specified
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on the command line.
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</p></dd>
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</dl>
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