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* [gcc r12-9724] libstdc++: Document removal of implicit allocator rebinding extensions
@ 2023-06-23 12:59 Jonathan Wakely
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From: Jonathan Wakely @ 2023-06-23 12:59 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:72ceed08d45137b0f1a9b4ea8ca533aa6489bc39
commit r12-9724-g72ceed08d45137b0f1a9b4ea8ca533aa6489bc39
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Mon May 15 21:41:56 2023 +0100
libstdc++: Document removal of implicit allocator rebinding extensions
Traditionally libstdc++ allowed containers to be
instantiated with allocator's that have the wrong value type, implicitly
rebinding the allocator to the container's value type. Since C++20 that
has been explicitly ill-formed, so the extension is no longer supported
in strict modes (e.g. -std=c++17) and in C++20 and later.
libstdc++-v3/ChangeLog:
* doc/xml/manual/evolution.xml: Document removal of implicit
allocator rebinding extensions in strict mode and for C++20.
* doc/html/*: Regenerate.
(cherry picked from commit 8cbaf679a3c1875c5475bd1cb0fb86fb9d03b2d4)
Diff:
---
libstdc++-v3/doc/html/manual/api.html | 9 +++++++++
libstdc++-v3/doc/xml/manual/evolution.xml | 13 +++++++++++++
2 files changed, 22 insertions(+)
diff --git a/libstdc++-v3/doc/html/manual/api.html b/libstdc++-v3/doc/html/manual/api.html
index 604380e0136..fd6420a9e2c 100644
--- a/libstdc++-v3/doc/html/manual/api.html
+++ b/libstdc++-v3/doc/html/manual/api.html
@@ -370,6 +370,11 @@ Calling a <code class="code">std::bind</code> result as volatile was deprecated
For the non-default <code class="option">--enable-symvers=gnu-versioned-namespace</code>
configuration, the shared library SONAME has been changed to
<code class="filename">libstdc++.so.8</code>.
+</p><p>
+ The extension allowing containers to be instantiated with an allocator
+ that doesn't match the container's value type is no longer allowed in
+ strict (<code class="option">-std=c++NN</code>) modes, only in
+ <code class="option">-std=gnu++NN</code> modes.
</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_91"></a><code class="constant">9</code></h3></div></div></div><p>
C++17 header
<code class="filename"><memory_resource></code>
@@ -425,6 +430,10 @@ Calling a <code class="code">std::bind</code> result as volatile was deprecated
and
<code class="filename"><stop_token></code>
added.
+</p><p>
+ The extension allowing containers to be instantiated with an allocator
+ that doesn't match the container's value type is no longer allowed in
+ C++20 mode, even in non-strict <code class="option">-std=gnu++20</code> mode.
</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="api.rel_111"></a><code class="constant">11</code></h3></div></div></div><p>
The <code class="option">--enable-cheaders=c_std</code> configuration
was deprecated.
diff --git a/libstdc++-v3/doc/xml/manual/evolution.xml b/libstdc++-v3/doc/xml/manual/evolution.xml
index 82936189179..9259c43fb19 100644
--- a/libstdc++-v3/doc/xml/manual/evolution.xml
+++ b/libstdc++-v3/doc/xml/manual/evolution.xml
@@ -915,6 +915,13 @@ Calling a <code>std::bind</code> result as volatile was deprecated for C++17.
<filename>libstdc++.so.8</filename>.
</para>
+<para>
+ The extension allowing containers to be instantiated with an allocator
+ that doesn't match the container's value type is no longer allowed in
+ strict (<option>-std=c++NN</option>) modes, only in
+ <option>-std=gnu++NN</option> modes.
+</para>
+
</section>
<section xml:id="api.rel_91"><info><title><constant>9</constant></title></info>
@@ -998,6 +1005,12 @@ Calling a <code>std::bind</code> result as volatile was deprecated for C++17.
added.
</para>
+<para>
+ The extension allowing containers to be instantiated with an allocator
+ that doesn't match the container's value type is no longer allowed in
+ C++20 mode, even in non-strict <option>-std=gnu++20</option> mode.
+</para>
+
</section>
<section xml:id="api.rel_111"><info><title><constant>11</constant></title></info>
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