From: Jonathan Wakely <jwakely@redhat.com>
Date: Mon, 15 May 2023 20:41:56 +0000 (+0100)
Subject: libstdc++: Document removal of implicit allocator rebinding extensions
X-Git-Tag: releases/gcc-13.2.0~207
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d50255d8d22a164cd87cb3f02a7b50c70d246639;p=thirdparty%2Fgcc.git

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 --git a/libstdc++-v3/doc/html/manual/api.html b/libstdc++-v3/doc/html/manual/api.html
index d9857675c78e..24876ec99f55 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">&lt;memory_resource&gt;</code>
@@ -425,6 +430,10 @@ Calling a <code class="code">std::bind</code> result as volatile was deprecated
   and
   <code class="filename">&lt;stop_token&gt;</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 a29e4df38224..cdfe69767bc7 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>