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 <span id="projectnumber">2.7.1</span>
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<div class="title">libavutil/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><td colspan="2"><h2><a name="define-members"></a>
Defines</h2></td></tr>
<tr><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><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><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><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><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><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><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><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><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="#a7ca8a3900269f92fcc7b68235dea7787"></a><br/></td></tr>
<tr><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><td class="mdescLeft"> </td><td class="mdescRight">Mark a variable as used and prevent the compiler from optimizing it away. <a href="#aa402443f9068fb645e9a55f41fc99e09"></a><br/></td></tr>
<tr><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><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><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><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><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>
</table>
<hr/><a name="details" id="details"></a><h2>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><hr/><h2>Define Documentation</h2>
<a class="anchor" id="a69fc4855d57a0b3471e795107677e5c4"></a><!-- doxytag: member="attributes.h::AV_GCC_VERSION_AT_LEAST" ref="a69fc4855d57a0b3471e795107677e5c4" args="(x, y)" -->
<div class="memitem">
<div class="memproto">
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<td class="memname">#define <a class="el" href="attributes_8h.html#a69fc4855d57a0b3471e795107677e5c4">AV_GCC_VERSION_AT_LEAST</a></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="a299375f4aab80f039568d03b5c2f4214"></a><!-- doxytag: member="attributes.h::av_noinline" ref="a299375f4aab80f039568d03b5c2f4214" args="" -->
<div class="memitem">
<div class="memproto">
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<td class="memname">#define <a class="el" href="attributes_8h.html#a299375f4aab80f039568d03b5c2f4214">av_noinline</a>   __attribute__((noinline))</td>
</tr>
</table>
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<div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00054">54</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="adc7fd5bb40d84900a3a30ef3318020c2"></a><!-- doxytag: member="attributes.h::av_pure" ref="adc7fd5bb40d84900a3a30ef3318020c2" args="" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define <a class="el" href="attributes_8h.html#adc7fd5bb40d84900a3a30ef3318020c2">av_pure</a>   __attribute__((pure))</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="a9eaead3cde73464fd66bab4cef9307ad"></a><!-- doxytag: member="attributes.h::av_const" ref="a9eaead3cde73464fd66bab4cef9307ad" args="" -->
<div class="memitem">
<div class="memproto">
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<td class="memname">#define <a class="el" href="attributes_8h.html#a9eaead3cde73464fd66bab4cef9307ad">av_const</a>   __attribute__((const))</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00068">68</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="abeeb324fff79a5335d36774704e2475c"></a><!-- doxytag: member="attributes.h::av_cold" ref="abeeb324fff79a5335d36774704e2475c" args="" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define <a class="el" href="attributes_8h.html#abeeb324fff79a5335d36774704e2475c">av_cold</a>   __attribute__((cold))</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00074">74</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="a767318f92f3dcb0a604c6beaa910eb0c"></a><!-- doxytag: member="attributes.h::av_flatten" ref="a767318f92f3dcb0a604c6beaa910eb0c" args="" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define <a class="el" href="attributes_8h.html#a767318f92f3dcb0a604c6beaa910eb0c">av_flatten</a>   __attribute__((flatten))</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00080">80</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="aa6d076561d3a9eea4729ee632652de02"></a><!-- doxytag: member="attributes.h::attribute_deprecated" ref="aa6d076561d3a9eea4729ee632652de02" args="" -->
<div class="memitem">
<div class="memproto">
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<tr>
<td class="memname">#define <a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a>   __attribute__((deprecated))</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00086">86</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="a7ca8a3900269f92fcc7b68235dea7787"></a><!-- doxytag: member="attributes.h::av_unused" ref="a7ca8a3900269f92fcc7b68235dea7787" args="" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define <a class="el" href="attributes_8h.html#a7ca8a3900269f92fcc7b68235dea7787">av_unused</a>   __attribute__((unused))</td>
</tr>
</table>
</div>
<div class="memdoc">
<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#l00118">118</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="aa402443f9068fb645e9a55f41fc99e09"></a><!-- doxytag: member="attributes.h::av_used" ref="aa402443f9068fb645e9a55f41fc99e09" args="" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define <a class="el" href="attributes_8h.html#aa402443f9068fb645e9a55f41fc99e09">av_used</a>   __attribute__((used))</td>
</tr>
</table>
</div>
<div class="memdoc">
<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#l00129">129</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="ae7fb094d0e833b9afe387f7283dbbad3"></a><!-- doxytag: member="attributes.h::av_alias" ref="ae7fb094d0e833b9afe387f7283dbbad3" args="" -->
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<div class="memproto">
<table class="memname">
<tr>
<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>
</tr>
</table>
</div>
<div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00135">135</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="a934ff195492486f0f9d22770103e757b"></a><!-- doxytag: member="attributes.h::av_uninit" ref="a934ff195492486f0f9d22770103e757b" args="(x)" -->
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<td class="memname">#define <a class="el" href="attributes_8h.html#a934ff195492486f0f9d22770103e757b">av_uninit</a></td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">x</td><td>)</td>
<td>   x=x</td>
</tr>
</table>
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<div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00141">141</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
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<a class="anchor" id="a4887afda7f138d25d3f0dd843ca0ac18"></a><!-- doxytag: member="attributes.h::av_builtin_constant_p" ref="a4887afda7f138d25d3f0dd843ca0ac18" args="" -->
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<td class="memname">#define <a class="el" href="attributes_8h.html#a4887afda7f138d25d3f0dd843ca0ac18">av_builtin_constant_p</a>   __builtin_constant_p</td>
</tr>
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<div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00147">147</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="a4b078d4b8e02c0f452ee1dcaa7d983d3"></a><!-- doxytag: member="attributes.h::av_printf_format" ref="a4b078d4b8e02c0f452ee1dcaa7d983d3" args="(fmtpos, attrpos)" -->
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<td class="memname">#define <a class="el" href="attributes_8h.html#a4b078d4b8e02c0f452ee1dcaa7d983d3">av_printf_format</a></td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">fmtpos, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">attrpos </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td>   __attribute__((__format__(__printf__, fmtpos, attrpos)))</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Definition at line <a class="el" href="attributes_8h_source.html#l00148">148</a> of file <a class="el" href="attributes_8h_source.html">attributes.h</a>.</p>
</div>
</div>
<a class="anchor" id="ac85a6b34744701495efddc98c65e8afa"></a><!-- doxytag: member="attributes.h::av_noreturn" ref="ac85a6b34744701495efddc98c65e8afa" args="" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define <a class="el" href="attributes_8h.html#ac85a6b34744701495efddc98c65e8afa">av_noreturn</a>   __attribute__((noreturn))</td>
</tr>
</table>
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<div class="memdoc">
<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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