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| 22 | <title>Old GNU Inlining (GNU C Language Manual)</title>
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| 32 | <link href="Obsolete-Definitions.html" rel="up" title="Obsolete Definitions">
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| 58 | <span id="Old-GNU-Inlining"></span><div class="header">
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| 59 | <p>
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| 60 | Next: <a href="Old_002dStyle-Function-Definitions.html" accesskey="n" rel="next">Old-Style Function Definitions</a>, Up: <a href="Obsolete-Definitions.html" accesskey="u" rel="up">Obsolete Definitions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Index.html" title="Index" rel="index">Index</a>]</p>
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| 61 | </div>
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| 62 | <hr>
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| 63 | <span id="Older-GNU-C-Inlining"></span><h4 class="subsection">22.8.1 Older GNU C Inlining</h4>
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| 64 |
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| 65 | <p>The GNU C spec for inline functions, before GCC version 5, defined
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| 66 | <code>extern inline</code> on a function definition to mean to inline calls
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| 67 | to it but <em>not</em> generate code for the function that could be
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| 68 | called at run time. By contrast, <code>inline</code> without <code>extern</code>
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| 69 | specified to generate run-time code for the function. In effect, ISO
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| 70 | incompatibly flipped the meanings of these two cases. We changed GCC
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| 71 | in version 5 to adopt the ISO specification.
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| 72 | </p>
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| 73 | <p>Many programs still use these cases with the previous GNU C meanings.
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| 74 | You can specify use of those meanings with the option
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| 75 | <samp>-fgnu89-inline</samp>. You can also specify this for a single
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| 76 | function with <code>__attribute__ ((gnu_inline))</code>. Here’s an example:
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| 77 | </p>
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| 78 | <div class="example">
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| 79 | <pre class="example">inline __attribute__ ((gnu_inline))
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| 80 | int
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| 81 | inc (int *a)
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| 82 | {
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| 83 | (*a)++;
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| 84 | }
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| 85 | </pre></div>
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| 86 |
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| 88 |
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| 89 |
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| 90 | </body>
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| 91 | </html>
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