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commit 4979889192aecb6c5693d1a48f2d5ca0d6d6b3a5
Author: David Malcolm <dmalc...@redhat.com>
Date: Wed Jan 15 12:26:33 2025 -0500
gcc-15/porting_to: prefer <stdint.h> to <cstdint.h> for non-std:: types
Signed-off-by: David Malcolm <dmalc...@redhat.com>
diff --git a/htdocs/gcc-15/porting_to.html b/htdocs/gcc-15/porting_to.html
index 7344afa5..39598b93 100644
--- a/htdocs/gcc-15/porting_to.html
+++ b/htdocs/gcc-15/porting_to.html
@@ -82,11 +82,13 @@ As such, C++ programs that used standard library components
without
including the right headers will no longer compile.
</p>
<p>
-In particular, the following header is used less widely within libstdc++ and
+In particular, the following headers are used less widely within libstdc++ and
may need to be included explicitly when compiling with GCC 15:
</p>
<ul>
-<li> <code><cstdint></code>
+<li> <code><stdint.h></code>
+ (for <code>int8_t</code>, <code>int32_t</code> etc.)
+ and <code><cstdint></code>
(for <code>std::int8_t</code>, <code>std::int32_t</code> etc.)
</li>
</ul>
commit f6ffc93bec5200fbf5fb16542d55c5b9dd0594c6
Author: David Malcolm <dmalc...@redhat.com>
Date: Wed Jan 15 12:12:43 2025 -0500
gcc-15/porting_to: add section on new C23 keywords
Signed-off-by: David Malcolm <dmalc...@redhat.com>
diff --git a/htdocs/gcc-15/porting_to.html b/htdocs/gcc-15/porting_to.html
index e6da6cd9..7344afa5 100644
--- a/htdocs/gcc-15/porting_to.html
+++ b/htdocs/gcc-15/porting_to.html
@@ -43,6 +43,36 @@ to your build flags, or port your code to C23.
<!-- C23 brings the following changes: -->
+<h4 id="c23-new-keywords">New keywords</h4>
+<p>
+ C23 added various new keywords, including
+ <code>bool</code>, <code>true</code>, <code>false</code>,
+ <code>nullptr</code>, and <code>thread_local</code>.
+ Code that uses these for identifiers will need changing.
+ For example <code>typedef int bool;</code> will
+ <a href="https://godbolt.org/z/7W8fMT9zd";>fail</a> with:
+</p>
+<pre><code>
+<source>:1:13: error: 'bool' cannot be defined via 'typedef'
+ 1 | typedef int bool;
+ | ^~~~
+<source>:1:13: note: 'bool' is a keyword with '-std=c23' onwards
+<source>:1:1: warning: useless type name in empty declaration
+ 1 | typedef int bool;
+ | ^~~~~~~
+</code></pre>
+<p>
+ In C99 and later you can use <code>#include <stdbool.h></code>
+ which provides definitions of <code>bool</code>, <code>true</code>,
+ and <code>false</code> compatible with C23.
+</p>
+<p>
+ Note that the <code>bool</code> type is <b>not</b> the same
+ as <code>int</code> at ABI level, and so care may be needed porting
+ declarations that appear at an ABI boundary (or serialized to the
+ filesystem).
+</p>
+
<h2 id="cxx">C++ language issues</h2>
<h3 id="header-dep-changes">Header dependency changes</h3>
commit 172ad664634bf0dd7c01c48a6c9dfa92e0cf3427
Author: David Malcolm <dmalc...@redhat.com>
Date: Wed Jan 15 14:07:56 2025 -0500
gcc-15/porting_to: C23 by default
Signed-off-by: David Malcolm <dmalc...@redhat.com>
diff --git a/htdocs/gcc-15/porting_to.html b/htdocs/gcc-15/porting_to.html
index 702cf507..e6da6cd9 100644
--- a/htdocs/gcc-15/porting_to.html
+++ b/htdocs/gcc-15/porting_to.html
@@ -27,7 +27,21 @@ and provide solutions. Let us know if you have suggestions
for improvements!
<p>Note: GCC 15 has not been released yet, so this document is
a work-in-progress.</p>
-<!-- <h2 id="c">C language issues</h2> -->
+<h2 id="c">C language issues</h2>
+
+<h3 id="c23">C23 by default</h3>
+<!-- change of default was in commit 55e3bd376b2214e200fa76d12b67ff259b06c212
-->
+
+GCC 15 changes the default language version for C compilation from
+<a
href="https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=gnu17</a>
+to
+<a
href="https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=gnu23</a>.
+
+If your code relies on older versions of the C standard, you will need to
+either add <a
href="https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=</a>
+to your build flags, or port your code to C23.
+
+<!-- C23 brings the following changes: -->
<h2 id="cxx">C++ language issues</h2>
commit 4e3abc55705b3ac26c202523bc482c2691692885
Author: David Malcolm <dmalc...@redhat.com>
Date: Wed Jan 15 14:05:47 2025 -0500
gcc-15/changes: C23 by default
Signed-off-by: David Malcolm <dmalc...@redhat.com>
diff --git a/htdocs/gcc-15/changes.html b/htdocs/gcc-15/changes.html
index d5037efb..c87c8a0d 100644
--- a/htdocs/gcc-15/changes.html
+++ b/htdocs/gcc-15/changes.html
@@ -99,6 +99,18 @@ a work-in-progress.</p>
<code>musttail</code> statement attribute</a> was added to enforce
tail calls.</li>
</ul>
+<h3 id="c">C</h3>
+<ul>
+ <li>GCC 15 changes the default language version for C compilation from
+ <a
href="https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=gnu17</a>
+ to
+ <a
href="https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=gnu23</a>.
+ If your code relies on older versions of the C standard, you will need to
+ either add
+ <a
href="https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=</a>
+ to your build flags, or port your code; see <a
href="porting_to.html#c23">the porting notes</a>.
+</ul>
+
<h3 id="cxx">C++</h3>
<ul>
-----------------------------------------------------------------------
Summary of changes:
htdocs/gcc-15/changes.html | 12 ++++++++++
htdocs/gcc-15/porting_to.html | 52 ++++++++++++++++++++++++++++++++++++++++---
2 files changed, 61 insertions(+), 3 deletions(-)
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