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<!DOCTYPE html>
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<html lang="en">
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<meta charset="utf-8">
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<title>Issue 4247: Header &lt;stdbit.h&gt; is not yet freestanding</title>
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<meta property="og:title" content="Issue 4247: Header &lt;stdbit.h&gt; is not yet freestanding">
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<meta property="og:description" content="C++ library issue. Status: New">
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<meta property="og:url" content="https://cplusplus.github.io/LWG/issue4247.html">
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<p><em>This page is a snapshot from the LWG issues list, see the <a href="lwg-active.html">Library Active Issues List</a> for more information and the meaning of <a href="lwg-active.html#New">New</a> status.</em></p>
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<h3 id="4247"><a href="lwg-active.html#4247">4247</a>. Header <code>&lt;stdbit.h&gt;</code> is not yet freestanding</h3>
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<p><b>Section:</b> 22.12 <a href="https://wg21.link/stdbit.h.syn">[stdbit.h.syn]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Jiang An <b>Opened:</b> 2025-04-24 <b>Last modified:</b> 2025-04-27</p>
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<p><b>Priority: </b>Not Prioritized
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</p>
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<p><b>View all issues with</b> <a href="lwg-status.html#New">New</a> status.</p>
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<p><b>Discussion:</b></p>
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<p>
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Per C23/WG14 <a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3220.pdf#page=22">N3220</a> 4 p7, <code>&lt;stdbit.h&gt;</code>
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is freestanding in C23, but C++ hasn't required it for a freestanding implementation.
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LWG <a href="lwg-active.html#4049" title="C &lt;foo.h&gt; headers not in freestanding (Status: New)">4049</a><sup><a href="https://cplusplus.github.io/LWG/issue4049" title="Latest snapshot">(i)</a></sup> is related but doesn't cover this, because there's no <code>&lt;cstdbit&gt;</code> standard header.
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</p>
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<p id="res-4247"><b>Proposed resolution:</b></p>
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<p>
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This wording is relative to <a href="https://wg21.link/N5008">N5008</a>.
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</p>
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<ol>
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<li><p>Modify Table 27 [tab:headers.cpp.fs] as indicated:</p>
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<blockquote>
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<table border="1">
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<caption>Table 27: C++ headers for freestanding implementations [tab:headers.cpp.fs]</caption>
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<tr align="center">
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<th></th>
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<th>Subclause</th>
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<th>Header</th>
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</tr>
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<tr>
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<td colspan="3" align="center">
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<code>[&hellip;]</code>
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</td>
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</tr>
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<tr>
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<td>
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22.11 <a href="https://wg21.link/bit">[bit]</a>
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</td>
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<td>
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Bit manipulation
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</td>
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<td>
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<code>&lt;bit&gt;</code>
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</td>
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</tr>
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<tr>
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<td>
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<ins>22.12 <a href="https://wg21.link/stdbit.h.syn">[stdbit.h.syn]</a></ins>
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</td>
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<td>
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<ins>C-compatible bit manipulation</ins>
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</td>
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<td>
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<ins><code>&lt;stdbit.h&gt;</code></ins>
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</td>
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</tr>
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<td>
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23.3.3 <a href="https://wg21.link/array">[array]</a>
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</td>
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Class template <code class='backtick'>array</code>
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</td>
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<td>
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<code>&lt;array&gt;</code>
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</td>
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</tr>
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<td colspan="3" align="center">
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<code>[&hellip;]</code>
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</td>
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</tr>
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</table>
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</blockquote>
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</li>
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<li><p>Modify 22.12 <a href="https://wg21.link/stdbit.h.syn">[stdbit.h.syn]</a>, header <code>&lt;stdbit.h&gt;</code> synopsis, as indicated:</p>
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<blockquote>
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<pre>
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<ins>// all freestanding</ins>
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#define __STDC_VERSION_STDBIT_H__ 202311L
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#define __STDC_ENDIAN_BIG__ <i>see below</i>
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#define __STDC_ENDIAN_LITTLE__ <i>see below</i>
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#define __STDC_ENDIAN_NATIVE__ <i>see below</i>
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[&hellip;]
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</pre>
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</blockquote>
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</li>
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</ol>
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</body>
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</html>

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