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From: Jonathan Wakely <redi@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r13-5722] libstdc++: Document P1642 and extensions Date: Mon, 6 Feb 2023 20:47:47 +0000 (GMT) [thread overview] Message-ID: <20230206204747.2EC823858C83@sourceware.org> (raw) https://gcc.gnu.org/g:9f4baed6ac02f721f1adee043c4aa920dd5075b7 commit r13-5722-g9f4baed6ac02f721f1adee043c4aa920dd5075b7 Author: Arsen Arsenović <arsen@aarsen.me> Date: Mon Jan 23 13:41:45 2023 +0100 libstdc++: Document P1642 and extensions libstdc++-v3/ChangeLog: * doc/xml/manual/using.xml: Document newly-freestanding headers and the effect of the -ffreestanding flag. * doc/xml/manual/status_cxx2023.xml: Document P1642R11 as completed. * doc/xml/manual/configure.xml: Document that hosted installs respect __STDC_HOSTED__. * doc/xml/manual/test.xml: Document how to run tests in freestanding mode. * doc/html/*: Regenerate. Diff: --- libstdc++-v3/doc/html/index.html | 4 +- libstdc++-v3/doc/html/manual/configure.html | 5 +- .../doc/html/manual/documentation_hacking.html | 2 +- libstdc++-v3/doc/html/manual/memory.html | 2 +- .../doc/html/manual/policy_data_structures.html | 2 +- libstdc++-v3/doc/html/manual/status.html | 6 +- libstdc++-v3/doc/html/manual/test.html | 12 ++++ libstdc++-v3/doc/html/manual/using.html | 6 ++ .../doc/html/manual/using_dynamic_or_shared.html | 39 ++++++++++--- libstdc++-v3/doc/xml/manual/configure.xml | 5 +- libstdc++-v3/doc/xml/manual/status_cxx2023.xml | 11 ++++ libstdc++-v3/doc/xml/manual/test.xml | 14 +++++ libstdc++-v3/doc/xml/manual/using.xml | 66 +++++++++++++++++++--- 13 files changed, 152 insertions(+), 22 deletions(-) diff --git a/libstdc++-v3/doc/html/index.html b/libstdc++-v3/doc/html/index.html index ce951e6cc8e..ed7021bd461 100644 --- a/libstdc++-v3/doc/html/index.html +++ b/libstdc++-v3/doc/html/index.html @@ -1,6 +1,6 @@ <?xml version="1.0" encoding="UTF-8" standalone="no"?> -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>The GNU C++ Library</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><meta name="description" content="Short Contents Copyright (C) 2008-2022 FSF Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. This is the top level of the libstdc++ documentation set. The documentation is divided into the following three sections. Manual Frequently Asked Questions API and Source Documentation" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="index.html" title="The GNU C++ Library" /><link rel="next" href="manual/index.html" title="The GNU C++ Library Manual" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">The GNU C++ Library</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="manual/index.html">Next</a></td></tr></table><hr /></div><div class="set" lang="en" xml:lang="en"><div class="titlepage"><div><div><h1 class="title"><a id="set-index"></a>The GNU C++ Library</h1></div><div><div class="abstract"><a id="contents"></a><p class="title"><strong>Short Contents</strong></p><p> - Copyright (C) 2008-2022 +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>The GNU C++ Library</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><meta name="description" content="Short Contents Copyright (C) 2008-2023 FSF Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. This is the top level of the libstdc++ documentation set. The documentation is divided into the following three sections. Manual Frequently Asked Questions API and Source Documentation" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="index.html" title="The GNU C++ Library" /><link rel="next" href="manual/index.html" title="The GNU C++ Library Manual" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">The GNU C++ Library</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="manual/index.html">Next</a></td></tr></table><hr /></div><div class="set" lang="en" xml:lang="en"><div class="titlepage"><div><div><h1 class="title"><a id="set-index"></a>The GNU C++ Library</h1></div><div><div class="abstract"><a id="contents"></a><p class="title"><strong>Short Contents</strong></p><p> + Copyright (C) 2008-2023 <a class="link" href="https://www.fsf.org" target="_top">FSF </a> </p><p> diff --git a/libstdc++-v3/doc/html/manual/configure.html b/libstdc++-v3/doc/html/manual/configure.html index 9c5c2d9f170..dd9e6ef3579 100644 --- a/libstdc++-v3/doc/html/manual/configure.html +++ b/libstdc++-v3/doc/html/manual/configure.html @@ -219,7 +219,10 @@ built. The C++ Standard also describes a <span class="emphasis"><em>freestanding</em></span> environment, in which only a minimal set of headers are provided. This option builds such an - environment. + environment. Note that a hosted library installs headers that still can + be used in non hosted environments, as the library checks for + <code class="code">__STDC_HOSTED__</code>, however, a library configured with + <code class="code">--disable-hosted-libstdcxx</code> will not install unusable headers. </p></dd><dt><span class="term"><code class="code">--disable-libstdcxx-hosted</code></span></dt><dd><p>This is an alias for <code class="code">--disable-hosted-libstdcxx</code>.</p></dd><dt><span class="term"><code class="code">--disable-libstdcxx-verbose</code></span></dt><dd><p> By default, the library is configured to write descriptive messages to standard error for certain events such as calling a pure virtual diff --git a/libstdc++-v3/doc/html/manual/documentation_hacking.html b/libstdc++-v3/doc/html/manual/documentation_hacking.html index 7766f133bea..24df9bd9481 100644 --- a/libstdc++-v3/doc/html/manual/documentation_hacking.html +++ b/libstdc++-v3/doc/html/manual/documentation_hacking.html @@ -560,4 +560,4 @@ make <code class="literal">XSL_STYLE_DIR="/usr/share/xml/docbook/stylesheet/nwal </td></tr></tbody></table></div></div><br class="table-break" /></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="appendix_porting.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="appendix_porting.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="internals.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Appendix B. Porting and Maintenance - </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Porting to New Hardware or Operating Systems</td></tr></table></div></body></html> + </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Porting to New Hardware or Operating Systems</td></tr></table></div></body></html> \ No newline at end of file diff --git a/libstdc++-v3/doc/html/manual/memory.html b/libstdc++-v3/doc/html/manual/memory.html index a70613e8fd6..08ad2fd4dd8 100644 --- a/libstdc++-v3/doc/html/manual/memory.html +++ b/libstdc++-v3/doc/html/manual/memory.html @@ -644,4 +644,4 @@ be private. </a> </em>. </span><span class="subtitle"> N2461 - . </span></p></div></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="pairs.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="utilities.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="traits.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Pairs </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Traits</td></tr></table></div></body></html> + . </span></p></div></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="pairs.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="utilities.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="traits.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Pairs </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Traits</td></tr></table></div></body></html> \ No newline at end of file diff --git a/libstdc++-v3/doc/html/manual/policy_data_structures.html b/libstdc++-v3/doc/html/manual/policy_data_structures.html index ef54da8053a..90345550012 100644 --- a/libstdc++-v3/doc/html/manual/policy_data_structures.html +++ b/libstdc++-v3/doc/html/manual/policy_data_structures.html @@ -1297,4 +1297,4 @@ Wickland </span>. </span><span class="publisher"><span class="publishername"> National Psychological Institute - . </span></span></p></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="bitmap_allocator_impl.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="extensions.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="policy_data_structures_using.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Implementation </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Using</td></tr></table></div></body></html> + . </span></span></p></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="bitmap_allocator_impl.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="extensions.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="policy_data_structures_using.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Implementation </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Using</td></tr></table></div></body></html> \ No newline at end of file diff --git a/libstdc++-v3/doc/html/manual/status.html b/libstdc++-v3/doc/html/manual/status.html index 47bb0781417..c99d51ff709 100644 --- a/libstdc++-v3/doc/html/manual/status.html +++ b/libstdc++-v3/doc/html/manual/status.html @@ -1916,7 +1916,11 @@ or any notes about the implementation. <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2186r2.html" target="_top"> P2186R2 </a> - </td><td align="center"> 12.1 </td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.tr1"></a>C++ TR1</h3></div></div></div><p> + </td><td align="center"> 12.1 </td><td align="left"> </td></tr><tr><td align="left"> Easy [utilities], [ranges], and [iterators] </td><td align="left"> + <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1642r11.html" target="_top"> + P1642R11 + </a> + </td><td align="center"> 13.1 </td><td align="left"> </td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.tr1"></a>C++ TR1</h3></div></div></div><p> This table is based on the table of contents of ISO/IEC DTR 19768, Doc No: N1836=05-0096, Date: 2005-06-24, "Draft Technical Report on C++ Library Extensions". diff --git a/libstdc++-v3/doc/html/manual/test.html b/libstdc++-v3/doc/html/manual/test.html index 10ae4ed5e1b..fadadf249bb 100644 --- a/libstdc++-v3/doc/html/manual/test.html +++ b/libstdc++-v3/doc/html/manual/test.html @@ -203,6 +203,18 @@ cat 27_io/objects/char/3_xin.in | a.out</pre></dd><dt><span class="term"><code c </p><pre class="programlisting"> make check-target-libstdc++-v3 RUNTESTFLAGS='--target_board \"unix{-mabi=32,,-mabi=64}\"' </pre><p> + </p><p> + If you wish to run the testsuite in a freestanding configuration, you can + pass the <code class="code">-ffreestanding</code> flag. Doing so will run the tests + that do not require hosted features, and emit a + <code class="literal">UNSUPPORTED</code> for those that do. To run tests in the + freestanding configuration, you still need to build for a target you can + run programs on, e.g. <code class="code">x86_64-pc-linux-gnu</code>, as a few tests + still execute the code they build. Here's an example of how to run the + testsuite with libstdc++ in freestanding mode: + </p><pre class="programlisting"> + make check-target-libstdc++-v3 RUNTESTFLAGS='--target_board=unix/-ffreestanding' + </pre><p> </p><p> You can run the tests with a compiler and library that have already been installed. Make sure that the compiler (e.g., diff --git a/libstdc++-v3/doc/html/manual/using.html b/libstdc++-v3/doc/html/manual/using.html index f2dc2078759..f23325ebe97 100644 --- a/libstdc++-v3/doc/html/manual/using.html +++ b/libstdc++-v3/doc/html/manual/using.html @@ -40,4 +40,10 @@ </td></tr><tr><td align="left"><code class="literal">-fopenmp</code></td><td align="left">For <a class="link" href="parallel_mode.html" title="Chapter 18. Parallel Mode">parallel</a> mode.</td></tr><tr><td align="left"><code class="literal">-ltbb</code></td><td align="left">Linking to tbb (Thread Building Blocks) is required for use of the Parallel Standard Algorithms and execution policies in <code class="filename"><execution></code>. + </td></tr><tr><td align="left"><code class="literal">-ffreestanding</code></td><td align="left"> + Limits the library to its freestanding subset. Headers that are + not supported in freestanding will emit a "This header is not available + in freestanding mode" error. + Headers that are in the freestanding subset partially will not expose + functionality that is not part of the freestanding subset. </td></tr></tbody></table></div></div><br class="table-break" /></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="make.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="intro.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="using_headers.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Make </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Headers</td></tr></table></div></body></html> \ No newline at end of file diff --git a/libstdc++-v3/doc/html/manual/using_dynamic_or_shared.html b/libstdc++-v3/doc/html/manual/using_dynamic_or_shared.html index 3c9e5fa54b0..73d1f18485f 100644 --- a/libstdc++-v3/doc/html/manual/using_dynamic_or_shared.html +++ b/libstdc++-v3/doc/html/manual/using_dynamic_or_shared.html @@ -30,15 +30,40 @@ <code class="filename">initializer_list</code> </p></li><li class="listitem"><p> <code class="filename">type_traits</code> - </p></li></ul></div><p> There exists a library that offers runtime support for - just these headers, and it is called - <code class="filename">libsupc++.a</code>. To use it, compile with <span class="command"><strong>gcc</strong></span> instead of <span class="command"><strong>g++</strong></span>, like so: + </p></li></ul></div><p> + As of GCC 13, libstdc++ implements P1642, which brings in many more + headers, as well a quite a few ones not covered by the paper. + + In general, if a feature does not require traditionally libc-provided + facilities, or dynamic memory allocation, it's enabled in the + freestanding subset. In addition, if only a subset of a header + requires such features, it is partially included. Some examples + include: + </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + <code class="filename">string_view</code> + </p></li><li class="listitem"><p> + <code class="filename">tuple</code> + </p></li><li class="listitem"><p> + <code class="filename">bitset</code> + </p></li></ul></div><p> + Currently, this subset includes all of the iterator APIs (including the + ranges APIs) that do not involve streams, the entire C++ algorithms + library, excluding parallel algorithms, and a large part of the + utilities library. This is on top of the headers included in the lists + above. + </p><p> + If you're using a libstdc++ configured for hosted environments, and + would like to not involve the libraries libstdc++ would depend on in + your programs, you will need to use <span class="command"><strong>gcc</strong></span> to link your + application with only <code class="filename">libsupc++.a</code>, + like so: </p><p> - <span class="command"><strong>gcc foo.cc -lsupc++</strong></span> + <span class="command"><strong>gcc -ffreestanding foo.cc -lsupc++</strong></span> </p><p> - No attempt is made to verify that only the minimal subset - identified above is actually used at compile time. Violations - are diagnosed as undefined symbols at link time. + If you configured libstdc++ with + <code class="code">--disable-hosted-libstdcxx</code>, however, you can use the + normal <span class="command"><strong>g++</strong></span> command to link, as this configuration + provides a (nearly) empty <code class="filename">libstdc++.a</code>. </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="manual.intro.using.linkage.dynamic"></a>Finding Dynamic or Shared Libraries</h3></div></div></div><p> If the only library built is the static library (<code class="filename">libstdc++.a</code>), or if diff --git a/libstdc++-v3/doc/xml/manual/configure.xml b/libstdc++-v3/doc/xml/manual/configure.xml index 8b3b8cab8c7..7ff07aea886 100644 --- a/libstdc++-v3/doc/xml/manual/configure.xml +++ b/libstdc++-v3/doc/xml/manual/configure.xml @@ -362,7 +362,10 @@ built. The C++ Standard also describes a <emphasis>freestanding</emphasis> environment, in which only a minimal set of headers are provided. This option builds such an - environment. + environment. Note that a hosted library installs headers that still can + be used in non hosted environments, as the library checks for + <code>__STDC_HOSTED__</code>, however, a library configured with + <code>--disable-hosted-libstdcxx</code> will not install unusable headers. </para> </listitem></varlistentry> diff --git a/libstdc++-v3/doc/xml/manual/status_cxx2023.xml b/libstdc++-v3/doc/xml/manual/status_cxx2023.xml index 365df505f54..f23c64d6a29 100644 --- a/libstdc++-v3/doc/xml/manual/status_cxx2023.xml +++ b/libstdc++-v3/doc/xml/manual/status_cxx2023.xml @@ -566,6 +566,17 @@ or any notes about the implementation. <entry /> </row> + <row> + <entry> Easy [utilities], [ranges], and [iterators] </entry> + <entry> + <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1642r11.html"> + P1642R11 + </link> + </entry> + <entry align="center"> 13.1 </entry> + <entry /> + </row> + </tbody> </tgroup> </table> diff --git a/libstdc++-v3/doc/xml/manual/test.xml b/libstdc++-v3/doc/xml/manual/test.xml index 7bc6e339723..964c53d2632 100644 --- a/libstdc++-v3/doc/xml/manual/test.xml +++ b/libstdc++-v3/doc/xml/manual/test.xml @@ -350,6 +350,20 @@ cat 27_io/objects/char/3_xin.in | a.out</programlisting> </programlisting> </para> + <para> + If you wish to run the testsuite in a freestanding configuration, you can + pass the <code>-ffreestanding</code> flag. Doing so will run the tests + that do not require hosted features, and emit a + <literal>UNSUPPORTED</literal> for those that do. To run tests in the + freestanding configuration, you still need to build for a target you can + run programs on, e.g. <code>x86_64-pc-linux-gnu</code>, as a few tests + still execute the code they build. Here's an example of how to run the + testsuite with libstdc++ in freestanding mode: + <programlisting> + make check-target-libstdc++-v3 RUNTESTFLAGS='--target_board=unix/-ffreestanding' + </programlisting> + </para> + <para> You can run the tests with a compiler and library that have already been installed. Make sure that the compiler (e.g., diff --git a/libstdc++-v3/doc/xml/manual/using.xml b/libstdc++-v3/doc/xml/manual/using.xml index 9c444dd2997..7f011a6d931 100644 --- a/libstdc++-v3/doc/xml/manual/using.xml +++ b/libstdc++-v3/doc/xml/manual/using.xml @@ -132,6 +132,17 @@ </entry> </row> + <row> + <entry><literal>-ffreestanding</literal></entry> + <entry> + Limits the library to its freestanding subset. Headers that are + not supported in freestanding will emit a "This header is not available + in freestanding mode" error. + Headers that are in the freestanding subset partially will not expose + functionality that is not part of the freestanding subset. + </entry> + </row> + </tbody> </tgroup> @@ -1523,19 +1534,60 @@ namespace gtk </listitem> </itemizedlist> - <para> There exists a library that offers runtime support for - just these headers, and it is called - <filename class="libraryfile">libsupc++.a</filename>. To use it, compile with <command>gcc</command> instead of <command>g++</command>, like so: + <para> + As of GCC 13, libstdc++ implements P1642, which brings in many more + headers, as well a quite a few ones not covered by the paper. + + In general, if a feature does not require traditionally libc-provided + facilities, or dynamic memory allocation, it's enabled in the + freestanding subset. In addition, if only a subset of a header + requires such features, it is partially included. Some examples + include: + </para> + + <itemizedlist> + <listitem> + <para> + <filename class="headerfile">string_view</filename> + </para> + </listitem> + <listitem> + <para> + <filename class="headerfile">tuple</filename> + </para> + </listitem> + <listitem> + <para> + <filename class="headerfile">bitset</filename> + </para> + </listitem> + </itemizedlist> + + <para> + Currently, this subset includes all of the iterator APIs (including the + ranges APIs) that do not involve streams, the entire C++ algorithms + library, excluding parallel algorithms, and a large part of the + utilities library. This is on top of the headers included in the lists + above. + </para> + + <para> + If you're using a libstdc++ configured for hosted environments, and + would like to not involve the libraries libstdc++ would depend on in + your programs, you will need to use <command>gcc</command> to link your + application with only <filename class="libraryfile">libsupc++.a</filename>, + like so: </para> <para> - <command>gcc foo.cc -lsupc++</command> + <command>gcc -ffreestanding foo.cc -lsupc++</command> </para> <para> - No attempt is made to verify that only the minimal subset - identified above is actually used at compile time. Violations - are diagnosed as undefined symbols at link time. + If you configured libstdc++ with + <code>--disable-hosted-libstdcxx</code>, however, you can use the + normal <command>g++</command> command to link, as this configuration + provides a (nearly) empty <filename class="libraryfile">libstdc++.a</filename>. </para> </section>
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