| <html lang="en"> |
| <head> |
| <title>Function Specific Option Pragmas - Using the GNU Compiler Collection (GCC)</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Using the GNU Compiler Collection (GCC)"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Pragmas.html#Pragmas" title="Pragmas"> |
| <link rel="prev" href="Push_002fPop-Macro-Pragmas.html#Push_002fPop-Macro-Pragmas" title="Push/Pop Macro Pragmas"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
| 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
| 2008 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.2 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Funding Free Software'', the Front-Cover |
| Texts being (a) (see below), and with the Back-Cover Texts being (b) |
| (see below). A copy of the license is included in the section entitled |
| ``GNU Free Documentation License''. |
| |
| (a) The FSF's Front-Cover Text is: |
| |
| A GNU Manual |
| |
| (b) The FSF's Back-Cover Text is: |
| |
| You have freedom to copy and modify this GNU Manual, like GNU |
| software. Copies published by the Free Software Foundation raise |
| funds for GNU development.--> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="Function-Specific-Option-Pragmas"></a> |
| <p> |
| Previous: <a rel="previous" accesskey="p" href="Push_002fPop-Macro-Pragmas.html#Push_002fPop-Macro-Pragmas">Push/Pop Macro Pragmas</a>, |
| Up: <a rel="up" accesskey="u" href="Pragmas.html#Pragmas">Pragmas</a> |
| <hr> |
| </div> |
| |
| <h4 class="subsection">6.54.13 Function Specific Option Pragmas</h4> |
| |
| <dl> |
| <dt><code>#pragma GCC target (</code><var>"string"</var><code>...)</code><dd><a name="index-pragma-GCC-target-3145"></a> |
| This pragma allows you to set target specific options for functions |
| defined later in the source file. One or more strings can be |
| specified. Each function that is defined after this point will be as |
| if <code>attribute((target("STRING")))</code> was specified for that |
| function. The parenthesis around the options is optional. |
| See <a href="Function-Attributes.html#Function-Attributes">Function Attributes</a>, for more information about the |
| <code>target</code> attribute and the attribute syntax. |
| |
| <p>The ‘<samp><span class="samp">#pragma GCC target</span></samp>’ pragma is not implemented in GCC |
| versions earlier than 4.4, and is currently only implemented for the |
| 386 and x86_64 backends. |
| </dl> |
| |
| <dl> |
| <dt><code>#pragma GCC optimize (</code><var>"string"</var><code>...)</code><dd><a name="index-pragma-GCC-optimize-3146"></a> |
| This pragma allows you to set global optimization options for functions |
| defined later in the source file. One or more strings can be |
| specified. Each function that is defined after this point will be as |
| if <code>attribute((optimize("STRING")))</code> was specified for that |
| function. The parenthesis around the options is optional. |
| See <a href="Function-Attributes.html#Function-Attributes">Function Attributes</a>, for more information about the |
| <code>optimize</code> attribute and the attribute syntax. |
| |
| <p>The ‘<samp><span class="samp">#pragma GCC optimize</span></samp>’ pragma is not implemented in GCC |
| versions earlier than 4.4. |
| </dl> |
| |
| <dl> |
| <dt><code>#pragma GCC push_options</code><dt><code>#pragma GCC pop_options</code><dd><a name="index-pragma-GCC-push_005foptions-3147"></a><a name="index-pragma-GCC-pop_005foptions-3148"></a> |
| These pragmas maintain a stack of the current target and optimization |
| options. It is intended for include files where you temporarily want |
| to switch to using a different ‘<samp><span class="samp">#pragma GCC target</span></samp>’ or |
| ‘<samp><span class="samp">#pragma GCC optimize</span></samp>’ and then to pop back to the previous |
| options. |
| |
| <p>The ‘<samp><span class="samp">#pragma GCC push_options</span></samp>’ and ‘<samp><span class="samp">#pragma GCC pop_options</span></samp>’ |
| pragmas are not implemented in GCC versions earlier than 4.4. |
| </dl> |
| |
| <dl> |
| <dt><code>#pragma GCC reset_options</code><dd><a name="index-pragma-GCC-reset_005foptions-3149"></a> |
| This pragma clears the current <code>#pragma GCC target</code> and |
| <code>#pragma GCC optimize</code> to use the default switches as specified |
| on the command line. |
| |
| <p>The ‘<samp><span class="samp">#pragma GCC reset_options</span></samp>’ pragma is not implemented in GCC |
| versions earlier than 4.4. |
| </dl> |
| |
| </body></html> |
| |
