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commit 9a4f238532b5b6a3e308ffdb29b50c0f5100a4c6
Author: Marek Polacek <pola...@redhat.com>
Date: Wed Jun 11 19:20:01 2025 -0400
c-status.html: Add C23 table
diff --git a/htdocs/projects/c-status.html b/htdocs/projects/c-status.html
index 215c5064..98dcb4d5 100644
--- a/htdocs/projects/c-status.html
+++ b/htdocs/projects/c-status.html
@@ -19,10 +19,422 @@ the <code>-std=</code> command-line option.
<li><a href="#c99">C99</a></li>
<li><a href="#c11">C11</a></li>
<li><a href="#c17">C17</a></li>
- <li>C23</li>
- <li>C2y</li>
+ <li><a href="#c23">C23</a></li>
+ <li><a href="#c2y">C2y</a></li>
</ul>
+<h2 id="c2y">C2y Support in GCC</h2>
+
+GCC has experimental and incomplete support for ISO C2y.
+
+<p>C2y can be explicitly selected with the <code>-std=c2y</code>
+command-line flag, or <code>-std=gnu2y</code> to enable GNU extensions
+as well.</p>
+
+<!--
+<table class="cxxstatus">
+ <tr class="separator">
+ <th>Feature</th>
+ <th>Proposal</th>
+ <th>Version</th>
+ <th>Notes</th>
+ </tr>
+ <tr>
+ <td></td>
+ <td></td>
+ <td class="supported"><a href="../gcc-4.9/changes.html#c"></a></td>
+ <td></td>
+ </tr>
+</table>
+-->
+
+<h2 id="c23">C23 Support in GCC</h2>
+
+GCC has support for ISO C23, the 2023 revision of the ISO C standard
+(published in 2024).
+
+<p>C23 mode is <a href="https://gcc.gnu.org/gcc-15/porting_to.html#c23";>
+the default</a> since GCC 15; it can be explicitly selected with the
+<code>-std=c23</code> command-line flag, or <code>-std=gnu23</code>
+to enable GNU extensions as well.</p>
+
+<table class="cxxstatus">
+ <tr class="separator">
+ <th>Feature</th>
+ <th>Proposal</th>
+ <th>Version</th>
+ <th>Notes</th>
+ </tr>
+ <tr>
+ <!-- r13-2520-g0a91bdaf177409 -->
+ <td>New keywords <code>alignas</code>, <code>alignof</code>,
+ <code>bool</code>, <code>false</code>, <code>static_assert</code>,
+ <code>thread_local</code>, <code>true</code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2934.pdf";>N2934</a>,
+ <a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2935.pdf";>N2935</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r9-3505-g9f936c861383dc -->
+ <td><code>_Static_assert</code> with no message</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2265.pdf";>N2665</a></td>
+ <td class="supported"><a href="../gcc-9/changes.html#c">9</a></td>
+ <td>support for <code>_Static_assert</code> with two arguments was added
+ in C11 and <a href="../gcc-4.6/changes.html#c">GCC 4.6</a></td>
+ </tr>
+ <tr>
+ <!-- r10-4466-g017c6491077bee -->
+ <!-- r12-244-gcc806126215c3f -->
+ <td>Removed support for function definitions with identifier lists</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2432.pdf";>N2432</a></td>
+ <td class="supported"><a href="../gcc-10/changes.html#c">10</a></td>
+ <td>removal of old-style function definitions</td>
+ </tr>
+ <tr>
+ <!-- r13-2349-g0a4b219d39c74a -->
+ <td>Removal of unprototyped functions</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2841.htm";>N2841</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td>function declarations whose parameter list is empty are treated the
+ same as a parameter list which only contain a single
<code>void</code></td>
+ </tr>
+ <tr>
+ <!-- r10-3658-g843f104d5bc6d1 -->
+ <td><code>strftime</code> supports <code>%OB</code> and <code>%Ob</code>
+ formats</td>
+ <td></td>
+ <td class="supported"><a href="../gcc-10/changes.html#c">10</a> (format
+ checking)</td>
+ <td>harmonization with ISO/IEC 9945; glibc support for these formats
+ was added in glibc 2.27</td>
+ </tr>
+ <tr>
+ <td>IEEE 754 decimal floating-point types (Optional)</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2341.pdf";>N2341</a></td>
+ <td class="supported"><a href="../gcc-4.3/changes.html#c">4.3</a>
+ (IA-32, x86-64, PowerPC, S/390) <br>
+ <a href="../gcc-13/changes.html#c">13</a> (aarch64)</td>
+ <!-- r10-3790-g27dfdc0f92850a -->
+ <td><code>DEC*_TRUE_MIN</code> macros added in
+ <a href="../gcc-10/changes.html#c">GCC 10</a></td>
+ </tr>
+ <tr>
+ <td>IEEE 754 interchange and extended types (Optional)</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2601.pdf";>N2601</a></td>
+ <td class="supported"><a href="../gcc-7/changes.html#c">7</a> (binary
types) <br>
+ <a href="../gcc-15/changes.html#c">15</a> (Annex H suffixes for decimal
types and
+ <code>_Decimal64x</code>)</td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r10-4613-g00be2a5f394119 -->
+ <td>Add <code>*_NORM_MAX</code> constants to
<code><float.h></code></td>
+ <td></td>
+ <td class="supported"><a href="../gcc-10/changes.html#c">10</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r11-5070 -->
+ <td>NaN and Inf macros in <code><float.h></code></td>
+ <td></td>
+ <td class="supported"><a href="../gcc-11/changes.html#c">11</a></td>
+ <td>corresponding built-in functions <code>__builtin_nansdN</code>
added</td>
+ </tr>
+ <tr>
+ <!-- r11-5102 -->
+ <td><code>*_IS_IEC_60559</code> macros in <code><float.h></code></td>
+ <td></td>
+ <td class="supported"><a href="../gcc-11/changes.html#c">11</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r11-5103 -->
+ <td><code>__STDC_WANT_IEC_60559_EXT__</code> supported by
<code><float.h></code></td>
+ <td></td>
+ <td class="supported"><a href="../gcc-11/changes.html#c">11</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-3939-g9a265c974cd85b -->
+ <td><code>__STDC_VERSION_*_H__</code> header version macros</td>
+ <td></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r11-4813 -->
+ <td>Labels before declarations and end of blocks</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2508.pdf";>N2508</a></td>
+ <td class="supported"><a href="../gcc-11/changes.html#c">11</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r10-4633-g4e03c3a7c1149a -->
+ <td><code>[[]]</code> attribute syntax</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2335.pdf";>N2335</a>,
+ <a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2554.pdf";>N2554</a></td>
+ <td class="supported"><a href="../gcc-10/changes.html#c">10</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r11-4953 -->
+ <td><code>__has_c_attribute</code> preprocessor operator</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2553.pdf";>N2553</a></td>
+ <td class="supported"><a href="../gcc-11/changes.html#c">11</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r10-4694-g2cc94aa8d817ba -->
+ <td><code>[[deprecated]]</code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2334.pdf";>N2334</a></td>
+ <td class="supported"><a href="../gcc-10/changes.html#c">10</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r10-4633-g4e03c3a7c1149a -->
+ <td><code>[[fallthrough]]</code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2408.pdf";>N2408</a></td>
+ <td class="supported"><a href="../gcc-10/changes.html#c">10</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r10-4729-g97cc11871e3988 -->
+ <!-- r13-2324-g2eca4ff4e867eb (labels) -->
+ <td><code>[[maybe_unused]]</code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2270.pdf";>N2270</a>,
+ <a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2662.pdf";>N2662</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td>support other than on labels added in <a
href="../gcc-10/changes.html#c">
+ GCC 10</a></td>
+ </tr>
+ <tr>
+ <!-- r11-4705 -->
+ <td><code>[[nodiscard]]</code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2267.pdf";>N2267</a>,
+ <a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2448.pdf";>N2448</a></td>
+ <td class="supported"><a href="../gcc-11/changes.html#c">11</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-2976-g3a3516bc4a0a03 -->
+ <td><code>[[noreturn]]</code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2764.pdf";>N2764</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r15-3330-gdd346b613886ae -->
+ <td><code>[[unsequenced]]</code> and <code>[[reproducible]]</code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2956.htm";>N2956</a></td>
+ <td class="supported"><a href="../gcc-15/changes.html#c">15</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r10-4691-g7c5890cc0a0ece -->
+ <td><code>u8</code> character constants</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2418.pdf";>N2418</a></td>
+ <td class="supported"><a href="../gcc-10/changes.html#c">10</a></td>
+ <td>for <code>char8_t</code> see
+ <a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2653.htm";>N2653</a></td>
+ </tr>
+ <tr>
+ <td>Type change of <code>u8</code> string literals</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2653.htm";>N2653</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-3289-g18981635127c67 -->
+ <td>Introduce storage-class specifiers for compound literals</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3038.htm";>N3038</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-3930-gb556d1773db717 -->
+ <td>The <code>constexpr</code> specifier for object definitions</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3018.htm";>N3018</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-2205-g14cfa01755a66a -->
+ <td>Support for empty initializer braces</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2900.htm";>N2900</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td>some cases were already supported, but not scalars and VLAs</td>
+ </tr>
+ <tr>
+ <!-- r13-3135-gfa258f6894801a -->
+ <td><code>typeof</code>, <code>typeof_unqual</code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2927.htm";>N2927</a>,
+ <a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2930.pdf";>N2930</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td><code>typeof</code> was previously supported as an extension</td>
+ </tr>
+ <tr>
+ <!-- r14-6770-g23fee88f84873b -->
+ <td>Improved tag compatibility</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3037.pdf";>N3037</a></td>
+ <td class="supported"><a href="../gcc-14/changes.html#c">14</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Bit-precise integer types (<code>_BitInt</code>)</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2763.pdf";>N2763</a>,
+ <a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2775.pdf";>N2775</a>,
+ <a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2969.htm";>N2969</a>,
+ <a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3035.pdf";>N3035</a></td>
+ <td class="supported"><a href="../gcc-14/changes.html#c">14</a>
+ (IA-32, x86-64 and AArch64 (little-endian) only)</td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-3360-g3b3083a598ca3f -->
+ <td>Improved rules for handling enumerations without underlying types</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3029.htm";>N3029</a></td>
+ <td class="supported">3.0</td>
+ <td>allows enums wider than int; adjusted in
+ <a href="../gcc-13/changes.html#c">GCC 13</a></td>
+ </tr>
+ <tr>
+ <!-- r13-3534-ge0997c14af5e8b -->
+ <td>Enhanced Enumerations (fixed underlying types)</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3030.htm";>N3030</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r15-3599-geba6d2aa71a9b5 and many more -->
+ <td><code>#embed</code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3017.htm";>N3017</a></td>
+ <td class="supported"><a href="../gcc-15/changes.html#c">15</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-2206-g60d84e82639e25 -->
+ <td><code>nullptr</code> constant</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3042.htm";>N3042</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-4541-gce53cf7b61ea6b -->
+ <td><code>__VA_OPT__</code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3033.htm";>N3033</a></td>
+ <td class="supported"><a href="../gcc-8/changes.html#c">8</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r11-4494 -->
+ <td>Parameter names may be omitted in function definitions</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2480.pdf";>N2480</a></td>
+ <td class="supported"><a href="../gcc-11/changes.html#c">11</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-3549-g4fe34cdcc80ac2 -->
+ <td>Relax requirements for variadic parameter lists</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2975.pdf";>N2975</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Identifier Syntax using Unicode Standard Annex 31</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2836.pdf";>N2836</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td><code>__has_include</code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2799.pdf";>N2799</a></td>
+ <td class="supported"><a href="../gcc-5/changes.html#c">5</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-3620-ge3c898e12d0ace -->
+ <td>Type inference for object definitions (<code>auto</code>)</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3007.htm";>N3007</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r12-730 -->
+ <td><code>#elifdef</code>, <code>#elifndef</code> preprocessor
directives</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2645.pdf";>N2645</a></td>
+ <td class="supported"><a href="../gcc-12/changes.html#c">12</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td><code>#warning</code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2686.pdf";>N2686</a></td>
+ <td class="supported">2.0</td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r0-81205-gf7fd775f0203c5 -->
+ <td>Binary integer literals</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2549.pdf";>N2549</a></td>
+ <td class="supported"><a href="../gcc-4.3/changes.html#c">4.3</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Formatting for input/output of binary integer numbers</td>
+ <td></td>
+ <td class="supported"><a href="../gcc-12/changes.html#c">12</a></td>
+ <!-- Formatted input/output should be remarked as mainly a glibc
+ feature (printf support in glibc 2.35, scanf support in 2.38;
+ PRIb*, PRIB* and SCNb* macros in inttypes.h also in 2.38) but
+ also with GCC format checking support. And the integer literals
+ have a secondary library part (strtol etc), also in glibc 2.38. -->
+ <td>mainly a glibc feature; GCC format checking support present</td>
+ </tr>
+ <tr>
+ <!-- r12-722 -->
+ <td>Digit separators</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2626.pdf";>N2626</a></td>
+ <td class="supported"><a href="../gcc-12/changes.html#c">12</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-2563-ga1a53dc7d87969 -->
+ <td><code>unreachable</code> macro in <code><stddef.h></code></td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2826.pdf";>N2826</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r11-2030 -->
+ <td><code>BOOL_MAX</code> and <code>BOOL_WIDTH</code> macros in
+ <code><limits.h></code></td>
+ <td></td>
+ <td class="supported"><a href="../gcc-11/changes.html#c">11</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-2626-g2e7bc76d84f0aa -->
+ <td><code>ATOMIC_VAR_INIT</code> removed</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2886.htm";>N2886</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <!-- r13-2451-g5f38bf14bcb3ff -->
+ <td>Removal of trigraphs</td>
+ <td><a
href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2940.pdf";>N2940</a></td>
+ <td class="supported"><a href="../gcc-13/changes.html#c">13</a></td>
+ <td>can still be enabled using <code>-trigraphs</code></td>
+ </tr>
+ <tr>
+ <!-- r14-3178-g8441841a1b985d -->
+ <td><code><stdckdint.h></code> header for checked integer
arithmetic</td>
+ <td></td>
+ <td class="supported"><a href="../gcc-14/changes.html#c">14</a></td>
+ <td></td>
+ </tr>
+</table>
+
<h2 id="c17">C17 Support in GCC</h2>
C17 brings no major changes, only technical corrections and clarifications.
@@ -31,6 +443,8 @@ C17 brings no major changes, only technical corrections and
clarifications.
command-line flag, or <code>-std=gnu17</code> to enable GNU extensions
as well.</p>
+<p>This was the default mode from GCC 8 to GCC 14 (including).</p>
+
<h2 id="c11">C11 Support in GCC</h2>
GCC has support for ISO C11, the 2011 revision of the ISO C standard.
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Summary of changes:
htdocs/projects/c-status.html | 418 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 416 insertions(+), 2 deletions(-)
hooks/post-receive
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gcc-wwwdocs
