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100 lines
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100 lines
4.7 KiB
HTML
4 years ago
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<title>Function Specific Option Pragmas - Using the GNU Compiler Collection (GCC)</title>
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<link rel="up" href="Pragmas.html#Pragmas" title="Pragmas">
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<link rel="prev" href="Push_002fPop-Macro-Pragmas.html#Push_002fPop-Macro-Pragmas" title="Push/Pop Macro Pragmas">
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<link rel="next" href="Loop_002dSpecific-Pragmas.html#Loop_002dSpecific-Pragmas" title="Loop-Specific Pragmas">
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<div class="node">
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<a name="Function-Specific-Option-Pragmas"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Loop_002dSpecific-Pragmas.html#Loop_002dSpecific-Pragmas">Loop-Specific Pragmas</a>,
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Previous: <a rel="previous" accesskey="p" href="Push_002fPop-Macro-Pragmas.html#Push_002fPop-Macro-Pragmas">Push/Pop Macro Pragmas</a>,
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Up: <a rel="up" accesskey="u" href="Pragmas.html#Pragmas">Pragmas</a>
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<hr>
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</div>
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<h4 class="subsection">6.60.13 Function Specific Option Pragmas</h4>
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<dl>
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<dt><code>#pragma GCC target (</code><var>"string"</var><code>...)</code><dd><a name="index-pragma-GCC-target-4183"></a>
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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>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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</dl>
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<dl>
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<dt><code>#pragma GCC optimize (</code><var>"string"</var><code>...)</code><dd><a name="index-pragma-GCC-optimize-4184"></a>
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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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</dl>
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<dl>
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<dt><code>#pragma GCC push_options</code><dt><code>#pragma GCC pop_options</code><dd><a name="index-pragma-GCC-push_005foptions-4185"></a><a name="index-pragma-GCC-pop_005foptions-4186"></a>
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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><span class="samp">#pragma GCC target</span></samp>’ or
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‘<samp><span class="samp">#pragma GCC optimize</span></samp>’ and then to pop back to the previous
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options.
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</dl>
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<dl>
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<dt><code>#pragma GCC reset_options</code><dd><a name="index-pragma-GCC-reset_005foptions-4187"></a>
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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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</dl>
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</body></html>
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