mirror of
https://github.com/capstone-engine/llvm-capstone.git
synced 2024-12-28 02:37:37 +00:00
5d71fc5d7b
This fixes most references to the paths: llvm.org/svn/ llvm.org/git/ llvm.org/viewvc/ github.com/llvm-mirror/ github.com/llvm-project/ reviews.llvm.org/diffusion/ to instead point to https://github.com/llvm/llvm-project. This is *not* a trivial substitution, because additionally, all the checkout instructions had to be migrated to instruct users on how to use the monorepo layout, setting LLVM_ENABLE_PROJECTS instead of checking out various projects into various subdirectories. I've attempted to not change any scripts here, only documentation. The scripts will have to be addressed separately. Additionally, I've deleted one document which appeared to be outdated and unneeded: lldb/docs/building-with-debug-llvm.txt Differential Revision: https://reviews.llvm.org/D57330 llvm-svn: 352514
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<!-- Material used from: HTML 4.01 specs: http://www.w3.org/TR/html401/ -->
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<html>
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<head>
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<META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>"libc++" C++ Standard Library</title>
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<link type="text/css" rel="stylesheet" href="menu.css">
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<link type="text/css" rel="stylesheet" href="content.css">
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</head>
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<body>
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<div id="menu">
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<div>
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<a href="https://llvm.org/">LLVM Home</a>
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</div>
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<div class="submenu">
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<label>libc++ Info</label>
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<a href="/index.html">About</a>
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</div>
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<div class="submenu">
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<label>Quick Links</label>
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<a href="https://libcxxabi.llvm.org/">libc++abi</a>
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<a href="https://lists.llvm.org/mailman/listinfo/libcxx-dev">libcxx-dev</a>
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<a href="https://lists.llvm.org/mailman/listinfo/libcxx-commits">libcxx-commits</a>
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<a href="https://bugs.llvm.org/">Bug Reports</a>
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<a href="https://github.com/llvm/llvm-project/tree/master/libcxx/">Browse Sources</a>
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</div>
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</div>
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<div id="content">
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<!--*********************************************************************-->
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<h1>"libc++" C++ Standard Library</h1>
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<!--*********************************************************************-->
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<p>libc++ is an implementation of the C++ standard library, targeting
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C++11, C++14 and above.</p>
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<p>All of the code in libc++ is <a
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href="https://llvm.org/docs/DeveloperPolicy.html#license">dual licensed</a>
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under the MIT license and the UIUC License (a BSD-like license).</p>
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<!--=====================================================================-->
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<h2>New Documentation Coming Soon!</h2>
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<!--=====================================================================-->
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<p> Looking for documentation on how to use, build and test libc++? If so
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checkout the new libc++ documentation.</p>
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<p><a href="https://libcxx.llvm.org/docs/">
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Click here for the new libc++ documentation.</a></p>
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<!--=====================================================================-->
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<h2 id="goals">Features and Goals</h2>
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<!--=====================================================================-->
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<ul>
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<li>Correctness as defined by the C++11 standard.</li>
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<li>Fast execution.</li>
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<li>Minimal memory use.</li>
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<li>Fast compile times.</li>
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<li>ABI compatibility with gcc's libstdc++ for some low-level features
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such as exception objects, rtti and memory allocation.</li>
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<li>Extensive unit tests.</li>
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</ul>
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<!--=====================================================================-->
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<h2 id="why">Why a new C++ Standard Library for C++11?</h2>
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<!--=====================================================================-->
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<p>After its initial introduction, many people have asked "why start a new
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library instead of contributing to an existing library?" (like Apache's
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libstdcxx, GNU's libstdc++, STLport, etc). There are many contributing
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reasons, but some of the major ones are:</p>
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<ul>
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<li><p>From years of experience (including having implemented the standard
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library before), we've learned many things about implementing
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the standard containers which require ABI breakage and fundamental changes
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to how they are implemented. For example, it is generally accepted that
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building std::string using the "short string optimization" instead of
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using Copy On Write (COW) is a superior approach for multicore
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machines (particularly in C++11, which has rvalue references). Breaking
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ABI compatibility with old versions of the library was
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determined to be critical to achieving the performance goals of
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libc++.</p></li>
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<li><p>Mainline libstdc++ has switched to GPL3, a license which the developers
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of libc++ cannot use. libstdc++ 4.2 (the last GPL2 version) could be
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independently extended to support C++11, but this would be a fork of the
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codebase (which is often seen as worse for a project than starting a new
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independent one). Another problem with libstdc++ is that it is tightly
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integrated with G++ development, tending to be tied fairly closely to the
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matching version of G++.</p>
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</li>
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<li><p>STLport and the Apache libstdcxx library are two other popular
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candidates, but both lack C++11 support. Our experience (and the
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experience of libstdc++ developers) is that adding support for C++11 (in
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particular rvalue references and move-only types) requires changes to
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almost every class and function, essentially amounting to a rewrite.
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Faced with a rewrite, we decided to start from scratch and evaluate every
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design decision from first principles based on experience.</p>
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<p>Further, both projects are apparently abandoned: STLport 5.2.1 was
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released in Oct'08, and STDCXX 4.2.1 in May'08.</p>
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</ul>
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<!--=====================================================================-->
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<h2 id="requirements">Platform Support</h2>
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<!--=====================================================================-->
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<p>
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libc++ is known to work on the following platforms, using g++ and
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clang. Note that functionality provided by <atomic> is only functional with
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clang.
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</p>
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<ul>
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<li>Mac OS X i386</li>
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<li>Mac OS X x86_64</li>
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<li>FreeBSD 10+ i386</li>
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<li>FreeBSD 10+ x86_64</li>
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<li>FreeBSD 10+ ARM</li>
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<li>Linux i386</li>
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<li>Linux x86_64</li>
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</ul>
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<!--=====================================================================-->
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<h2 id="dir-structure">Current Status</h2>
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<!--=====================================================================-->
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<p>libc++ is a 100% complete C++11 implementation on Apple's OS X. </p>
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<p>LLVM and Clang can self host in C++ and C++11 mode with libc++ on Linux.</p>
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<p>libc++ is also a 100% complete C++14 implementation. A list of new features and
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changes for C++14 can be found <a href="cxx1y_status.html">here</a>.</p>
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<p>libc++'s C++17 implementation is not yet complete. A list of features and changes
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for C++17 can be found <a href="cxx1z_status.html">here</a>.</p>
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<p>A list of features and changes for the next C++ standard, known here as
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"C++2a" (probably to be C++20) can be found <a href="cxx2a_status.html">here</a>.</p>
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<p>Implementation of the post-C++14 Technical Specifications is in progress. A list of features
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and the current status of these features can be found <a href="ts1z_status.html">here</a>.</p>
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<p>As features get moved from the Technical Specifications into the main standard, we
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will (after a period for migration) remove them from the TS implementation. This
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process is detailed <a href="TS_deprecation.html">here</a>.</p>
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<!--======================================================================-->
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<h2 id="buildbots">Build Bots</h2>
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<!--======================================================================-->
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<p>The latest libc++ build results can be found at the following locations.</p>
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<ul>
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<li><a href="http://lab.llvm.org:8011/console">
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Buildbot libc++ builders
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</a></li>
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<li><a href="http://lab.llvm.org:8080/green/view/Libcxx/">
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Jenkins libc++ builders
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</a></li>
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</ul>
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<!--=====================================================================-->
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<h2>Get it and get involved!</h2>
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<!--=====================================================================-->
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<p>First please review our
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<a href="https://llvm.org/docs/DeveloperPolicy.html">Developer's Policy</a>.
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The documentation for building and using libc++ can be found below.
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<ul>
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<li><a href="https://libcxx.llvm.org/docs/UsingLibcxx.html">
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<b>Using libc++</b></a>
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Documentation on using the library in your programs</li>
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<li><a href="https://libcxx.llvm.org/docs/BuildingLibcxx.html">
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<b>Building libc++</b></a>
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Documentation on building the library using CMake</li>
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<li><a href="https://libcxx.llvm.org/docs/TestingLibcxx.html">
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<b>Testing libc++</b></a>
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Documentation for developers wishing to test the library</li>
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</ul>
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<!--=====================================================================-->
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<h3>Notes and Known Issues</h3>
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<!--=====================================================================-->
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<p>
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<ul>
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<li>
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Building libc++ with <code>-fno-rtti</code> is not supported. However
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linking against it with <code>-fno-rtti</code> is supported.
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</li>
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<li>
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On OS X v10.8 and older the CMake option
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<code>-DLIBCXX_LIBCPPABI_VERSION=""</code> must be used during
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configuration.
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</li>
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</ul>
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</p>
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<p>Send discussions to the
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<a href="https://lists.llvm.org/mailman/listinfo/libcxx-dev">libc++ mailing list</a>.</p>
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<!--=====================================================================-->
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<h2>Bug reports and patches</h2>
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<!--=====================================================================-->
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<p>
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If you think you've found a bug in libc++, please report it using
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the <a href="https://bugs.llvm.org/">LLVM Bugzilla</a>. If you're not sure, you
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can post a message to the <a href="https://lists.llvm.org/mailman/listinfo/libcxx-dev">libcxx-dev</a>
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mailing list or on IRC.
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</p>
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<p>
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If you want to contribute a patch to libc++, the best place for that is
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<a href="https://llvm.org/docs/Phabricator.html">Phabricator</a>. Please
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add libcxx-commits as a subscriber.
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</p>
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<!--=====================================================================-->
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<h2>Design Documents</h2>
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<!--=====================================================================-->
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<ul>
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<li><a href="atomic_design.html"><tt><atomic></tt></a></li>
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<li><a href="type_traits_design.html"><tt><type_traits></tt></a></li>
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<li><a href="https://cplusplusmusings.wordpress.com/2012/07/05/clang-and-standard-libraries-on-mac-os-x/">Excellent notes by Marshall Clow</a></li>
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</ul>
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</div>
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</body>
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</html>
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