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The bitmap_allocator, __mt_alloc and __pool_alloc extensions are no longer suitable for use as the base class of std::allocator, because they have not been updated to meet the C++20 requirements. There is a patch attached to PR 103340 which addresses that, but more work would be needed to solve the linking errors that occur when the library is configured to use them. Using --enable-libstdcxx-allocator=bitmap wouldn't even bootstrap for the past few years, and I can't find any gcc-testresults reports using any of these allocators. This patch removes the configure option to use these as the std::allocator base class. The allocators are still in the tree and can be used directly, you just can't configure the library to use one of them as the base class of std::allocator. libstdc++-v3/ChangeLog: PR libstdc++/103340 PR libstdc++/103400 PR libstdc++/103381 * acinclude.m4 (GLIBCXX_ENABLE_ALLOCATOR): Remove mt, bitmap and pool options. * configure: Regenerate. * config/allocator/bitmap_allocator_base.h: Removed. * config/allocator/mt_allocator_base.h: Removed. * config/allocator/pool_allocator_base.h: Removed. * doc/xml/manual/allocator.xml: Update. * doc/xml/manual/configure.xml: Update. * doc/xml/manual/evolution.xml: Document removal. * doc/xml/manual/mt_allocator.xml: Editorial tweaks. * doc/html/manual/*: Regenerate.
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!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>Chapter 19. The mt_allocator</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><meta name="keywords" content="ISO C++, allocator" /><meta name="keywords" content="ISO C++, library" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.html" title="The GNU C++ Library" /><link rel="up" href="extensions.html" title="Part III. Extensions" /><link rel="prev" href="parallel_mode_test.html" title="Testing" /><link rel="next" href="mt_allocator_design.html" title="Design Issues" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 19. The mt_allocator</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="parallel_mode_test.html">Prev</a> </td><th width="60%" align="center">Part III.
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Extensions
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</th><td width="20%" align="right"> <a accesskey="n" href="mt_allocator_design.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a id="manual.ext.allocator.mt"></a>Chapter 19. The mt_allocator</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="section"><a href="mt_allocator.html#allocator.mt.intro">Intro</a></span></dt><dt><span class="section"><a href="mt_allocator_design.html">Design Issues</a></span></dt><dd><dl><dt><span class="section"><a href="mt_allocator_design.html#allocator.mt.overview">Overview</a></span></dt></dl></dd><dt><span class="section"><a href="mt_allocator_impl.html">Implementation</a></span></dt><dd><dl><dt><span class="section"><a href="mt_allocator_impl.html#allocator.mt.tune">Tunable Parameters</a></span></dt><dt><span class="section"><a href="mt_allocator_impl.html#allocator.mt.init">Initialization</a></span></dt><dt><span class="section"><a href="mt_allocator_impl.html#allocator.mt.deallocation">Deallocation Notes</a></span></dt></dl></dd><dt><span class="section"><a href="mt_allocator_ex_single.html">Single Thread Example</a></span></dt><dt><span class="section"><a href="mt_allocator_ex_multi.html">Multiple Thread Example</a></span></dt></dl></div><p>
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</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="allocator.mt.intro"></a>Intro</h2></div></div></div><p>
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The mt allocator [hereinafter referred to simply as "the allocator"]
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is a fixed size (power of two) allocator that was initially
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developed specifically to suit the needs of multi-threaded
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applications [hereinafter referred to as an MT application]. Over
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time the allocator has evolved and been improved in many ways, in
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particular it now also does a good job in single-threaded
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applications [hereinafter referred to as an ST application]. (Note:
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In this document, when referring to single-threaded applications
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this also includes applications that are compiled with gcc without
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thread support enabled. This is accomplished using ifdef's on
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__GTHREADS). This allocator is tunable, very flexible, and capable
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of high-performance.
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</p><p>
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The aim of this document is to describe - from an application point of
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view - the "inner workings" of the allocator.
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</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="parallel_mode_test.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="mt_allocator_design.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Testing </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Design Issues</td></tr></table></div></body></html> |