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<div class="title">attributes.h File Reference</div> </div>
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<p>Macro definitions for various function/variable attributes.
<a href="#details">More...</a></p>
<p><a href="attributes_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:a69fc4855d57a0b3471e795107677e5c4"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#a69fc4855d57a0b3471e795107677e5c4">AV_GCC_VERSION_AT_LEAST</a>(x, y)   (__GNUC__ > (x) || __GNUC__ == (x) && __GNUC_MINOR__ >= (y))</td></tr>
<tr class="separator:a69fc4855d57a0b3471e795107677e5c4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad3ce0a0e58bc7f1ad004e948d0ef87f7"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#ad3ce0a0e58bc7f1ad004e948d0ef87f7">AV_GCC_VERSION_AT_MOST</a>(x, y)   (__GNUC__ < (x) || __GNUC__ == (x) && __GNUC_MINOR__ <= (y))</td></tr>
<tr class="separator:ad3ce0a0e58bc7f1ad004e948d0ef87f7"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a28f50f4c125959216885f01d56dbe866"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#a28f50f4c125959216885f01d56dbe866">av_always_inline</a>   __attribute__((always_inline)) inline</td></tr>
<tr class="separator:a28f50f4c125959216885f01d56dbe866"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad91a09f8aa5a61759896a5609580dc1c"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#ad91a09f8aa5a61759896a5609580dc1c">av_extern_inline</a>   inline</td></tr>
<tr class="separator:ad91a09f8aa5a61759896a5609580dc1c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a93f17e0f0b53a66e7b5eceb3dff2918f"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#a93f17e0f0b53a66e7b5eceb3dff2918f">av_warn_unused_result</a>   __attribute__((warn_unused_result))</td></tr>
<tr class="separator:a93f17e0f0b53a66e7b5eceb3dff2918f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a299375f4aab80f039568d03b5c2f4214"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#a299375f4aab80f039568d03b5c2f4214">av_noinline</a>   __attribute__((noinline))</td></tr>
<tr class="separator:a299375f4aab80f039568d03b5c2f4214"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:adc7fd5bb40d84900a3a30ef3318020c2"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#adc7fd5bb40d84900a3a30ef3318020c2">av_pure</a>   __attribute__((pure))</td></tr>
<tr class="separator:adc7fd5bb40d84900a3a30ef3318020c2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9eaead3cde73464fd66bab4cef9307ad"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a>   __attribute__((const))</td></tr>
<tr class="separator:a9eaead3cde73464fd66bab4cef9307ad"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:abeeb324fff79a5335d36774704e2475c"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#abeeb324fff79a5335d36774704e2475c">av_cold</a>   __attribute__((cold))</td></tr>
<tr class="separator:abeeb324fff79a5335d36774704e2475c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a767318f92f3dcb0a604c6beaa910eb0c"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#a767318f92f3dcb0a604c6beaa910eb0c">av_flatten</a>   __attribute__((flatten))</td></tr>
<tr class="separator:a767318f92f3dcb0a604c6beaa910eb0c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa6d076561d3a9eea4729ee632652de02"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a>   __attribute__((deprecated))</td></tr>
<tr class="separator:aa6d076561d3a9eea4729ee632652de02"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab1b83f9b8188e770cc29043104205f53"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#ab1b83f9b8188e770cc29043104205f53">AV_NOWARN_DEPRECATED</a>(code)</td></tr>
<tr class="memdesc:ab1b83f9b8188e770cc29043104205f53"><td class="mdescLeft"> </td><td class="mdescRight">Disable warnings about deprecated features This is useful for sections of code kept for backward compatibility and scheduled for removal. <a href="#ab1b83f9b8188e770cc29043104205f53">More...</a><br/></td></tr>
<tr class="separator:ab1b83f9b8188e770cc29043104205f53"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a7ca8a3900269f92fcc7b68235dea7787"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#a7ca8a3900269f92fcc7b68235dea7787">av_unused</a>   __attribute__((unused))</td></tr>
<tr class="separator:a7ca8a3900269f92fcc7b68235dea7787"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa402443f9068fb645e9a55f41fc99e09"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#aa402443f9068fb645e9a55f41fc99e09">av_used</a>   __attribute__((used))</td></tr>
<tr class="memdesc:aa402443f9068fb645e9a55f41fc99e09"><td class="mdescLeft"> </td><td class="mdescRight">Mark a variable as used and prevent the compiler from optimizing it away. <a href="#aa402443f9068fb645e9a55f41fc99e09">More...</a><br/></td></tr>
<tr class="separator:aa402443f9068fb645e9a55f41fc99e09"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ae7fb094d0e833b9afe387f7283dbbad3"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#ae7fb094d0e833b9afe387f7283dbbad3">av_alias</a>   __attribute__((may_alias))</td></tr>
<tr class="separator:ae7fb094d0e833b9afe387f7283dbbad3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a934ff195492486f0f9d22770103e757b"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#a934ff195492486f0f9d22770103e757b">av_uninit</a>(x)   x=x</td></tr>
<tr class="separator:a934ff195492486f0f9d22770103e757b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4887afda7f138d25d3f0dd843ca0ac18"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#a4887afda7f138d25d3f0dd843ca0ac18">av_builtin_constant_p</a>   __builtin_constant_p</td></tr>
<tr class="separator:a4887afda7f138d25d3f0dd843ca0ac18"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4b078d4b8e02c0f452ee1dcaa7d983d3"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#a4b078d4b8e02c0f452ee1dcaa7d983d3">av_printf_format</a>(fmtpos, attrpos)   __attribute__((__format__(__printf__, fmtpos, attrpos)))</td></tr>
<tr class="separator:a4b078d4b8e02c0f452ee1dcaa7d983d3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ac85a6b34744701495efddc98c65e8afa"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="attributes_8h.html#ac85a6b34744701495efddc98c65e8afa">av_noreturn</a>   __attribute__((noreturn))</td></tr>
<tr class="separator:ac85a6b34744701495efddc98c65e8afa"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Macro definitions for various function/variable attributes. </p>
<p>Definition in file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
<a class="anchor" id="a69fc4855d57a0b3471e795107677e5c4"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">#define AV_GCC_VERSION_AT_LEAST</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">x, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">y </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td>   (__GNUC__ > (x) || __GNUC__ == (x) && __GNUC_MINOR__ >= (y))</td>
</tr>
</table>
</div><div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00030">30</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="ad3ce0a0e58bc7f1ad004e948d0ef87f7"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">#define AV_GCC_VERSION_AT_MOST</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">x, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">y </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td>   (__GNUC__ < (x) || __GNUC__ == (x) && __GNUC_MINOR__ <= (y))</td>
</tr>
</table>
</div><div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00031">31</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="a28f50f4c125959216885f01d56dbe866"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define av_always_inline   __attribute__((always_inline)) inline</td>
</tr>
</table>
</div><div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00039">39</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="ad91a09f8aa5a61759896a5609580dc1c"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">#define av_extern_inline   inline</td>
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</table>
</div><div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00051">51</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="a93f17e0f0b53a66e7b5eceb3dff2918f"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define av_warn_unused_result   __attribute__((warn_unused_result))</td>
</tr>
</table>
</div><div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00056">56</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="a299375f4aab80f039568d03b5c2f4214"></a>
<div class="memitem">
<div class="memproto">
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<td class="memname">#define av_noinline   __attribute__((noinline))</td>
</tr>
</table>
</div><div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00062">62</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="adc7fd5bb40d84900a3a30ef3318020c2"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">#define av_pure   __attribute__((pure))</td>
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</table>
</div><div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00070">70</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="a9eaead3cde73464fd66bab4cef9307ad"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">#define av_const   __attribute__((const))</td>
</tr>
</table>
</div><div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00076">76</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="abeeb324fff79a5335d36774704e2475c"></a>
<div class="memitem">
<div class="memproto">
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<td class="memname">#define av_cold   __attribute__((cold))</td>
</tr>
</table>
</div><div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00082">82</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="a767318f92f3dcb0a604c6beaa910eb0c"></a>
<div class="memitem">
<div class="memproto">
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<td class="memname">#define av_flatten   __attribute__((flatten))</td>
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</div><div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00088">88</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
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<a class="anchor" id="aa6d076561d3a9eea4729ee632652de02"></a>
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<td class="memname">#define attribute_deprecated   __attribute__((deprecated))</td>
</tr>
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</div><div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00094">94</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
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<a class="anchor" id="ab1b83f9b8188e770cc29043104205f53"></a>
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<td class="memname">#define AV_NOWARN_DEPRECATED</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">code</td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<b>Value:</b><div class="fragment"><div class="line">_Pragma(<span class="stringliteral">"GCC diagnostic push"</span>) \</div>
<div class="line"> _Pragma(<span class="stringliteral">"GCC diagnostic ignored \"-Wdeprecated-declarations\""</span>) \</div>
<div class="line"> code \</div>
<div class="line"> _Pragma(<span class="stringliteral">"GCC diagnostic pop"</span>)</div>
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<p>Disable warnings about deprecated features This is useful for sections of code kept for backward compatibility and scheduled for removal. </p>
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00108">108</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
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<td class="memname">#define av_unused   __attribute__((unused))</td>
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<p>Definition at line <a class="el" href="attributes_8h_source.html#l00126">126</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
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<td class="memname">#define av_used   __attribute__((used))</td>
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<p>Mark a variable as used and prevent the compiler from optimizing it away. </p>
<p>This is useful for variables accessed only from inline assembler without the compiler being aware. </p>
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00137">137</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
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<td class="memname">union <a class="el" href="unionunaligned__16.html">unaligned_16</a> <a class="el" href="unionav__alias.html">av_alias</a>   __attribute__((may_alias))</td>
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<p>Definition at line <a class="el" href="attributes_8h_source.html#l00143">143</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
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<td class="memname">#define av_uninit</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">x</td><td>)</td>
<td>   x=x</td>
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<p>Definition at line <a class="el" href="attributes_8h_source.html#l00149">149</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
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<td class="memname">#define av_builtin_constant_p   __builtin_constant_p</td>
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<p>Definition at line <a class="el" href="attributes_8h_source.html#l00155">155</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
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<td class="memname">#define av_printf_format</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">fmtpos, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">attrpos </td>
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<td>)</td>
<td></td><td>   __attribute__((__format__(__printf__, fmtpos, attrpos)))</td>
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<p>Definition at line <a class="el" href="attributes_8h_source.html#l00156">156</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
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<td class="memname">#define av_noreturn   __attribute__((noreturn))</td>
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<p>Definition at line <a class="el" href="attributes_8h_source.html#l00163">163</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
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