mirror of
https://github.com/capstone-engine/llvm-capstone.git
synced 2024-11-25 23:00:15 +00:00
94fac81fcc
According to the [[ https://foundation.llvm.org/docs/branch-rename/ | status of branch rename ]], the master branch of the LLVM repository is removed on 28 Jan 2021. Reviewed By: mehdi_amini Differential Revision: https://reviews.llvm.org/D95766
229 lines
9.8 KiB
HTML
229 lines
9.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
|
|
"http://www.w3.org/TR/html4/strict.dtd">
|
|
<!-- Material used from: HTML 4.01 specs: http://www.w3.org/TR/html401/ -->
|
|
<html>
|
|
<head>
|
|
<META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
|
<title>"libc++" C++ Standard Library</title>
|
|
<link type="text/css" rel="stylesheet" href="menu.css">
|
|
<link type="text/css" rel="stylesheet" href="content.css">
|
|
</head>
|
|
|
|
<body>
|
|
<div id="menu">
|
|
<div>
|
|
<a href="https://llvm.org/">LLVM Home</a>
|
|
</div>
|
|
|
|
<div class="submenu">
|
|
<label>libc++ Info</label>
|
|
<a href="/index.html">About</a>
|
|
</div>
|
|
|
|
<div class="submenu">
|
|
<label>Quick Links</label>
|
|
<a href="https://libcxxabi.llvm.org/">libc++abi</a>
|
|
<a href="https://lists.llvm.org/mailman/listinfo/libcxx-dev">libcxx-dev</a>
|
|
<a href="https://lists.llvm.org/mailman/listinfo/libcxx-commits">libcxx-commits</a>
|
|
<a href="https://bugs.llvm.org/">Bug Reports</a>
|
|
<a href="https://github.com/llvm/llvm-project/tree/main/libcxx/">Browse Sources</a>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="content">
|
|
<!--*********************************************************************-->
|
|
<h1>"libc++" C++ Standard Library</h1>
|
|
<!--*********************************************************************-->
|
|
|
|
<p>libc++ is an implementation of the C++ standard library, targeting
|
|
C++11, C++14 and above.</p>
|
|
|
|
<p>All of the code in libc++ is <a
|
|
href="https://llvm.org/docs/DeveloperPolicy.html#copyright-license-and-patents">dual licensed</a>
|
|
under the MIT license and the UIUC License (a BSD-like license).</p>
|
|
|
|
<!--=====================================================================-->
|
|
<h2>New Documentation Coming Soon!</h2>
|
|
<!--=====================================================================-->
|
|
|
|
<p> Looking for documentation on how to use, build and test libc++? If so
|
|
checkout the new libc++ documentation.</p>
|
|
|
|
<p><a href="https://libcxx.llvm.org/docs/">
|
|
Click here for the new libc++ documentation.</a></p>
|
|
|
|
<!--=====================================================================-->
|
|
<h2 id="goals">Features and Goals</h2>
|
|
<!--=====================================================================-->
|
|
|
|
<ul>
|
|
<li>Correctness as defined by the C++11 standard.</li>
|
|
<li>Fast execution.</li>
|
|
<li>Minimal memory use.</li>
|
|
<li>Fast compile times.</li>
|
|
<li>ABI compatibility with gcc's libstdc++ for some low-level features
|
|
such as exception objects, rtti and memory allocation.</li>
|
|
<li>Extensive unit tests.</li>
|
|
</ul>
|
|
|
|
<!--=====================================================================-->
|
|
<h2 id="why">Why a new C++ Standard Library for C++11?</h2>
|
|
<!--=====================================================================-->
|
|
|
|
<p>After its initial introduction, many people have asked "why start a new
|
|
library instead of contributing to an existing library?" (like Apache's
|
|
libstdcxx, GNU's libstdc++, STLport, etc). There are many contributing
|
|
reasons, but some of the major ones are:</p>
|
|
|
|
<ul>
|
|
<li><p>From years of experience (including having implemented the standard
|
|
library before), we've learned many things about implementing
|
|
the standard containers which require ABI breakage and fundamental changes
|
|
to how they are implemented. For example, it is generally accepted that
|
|
building std::string using the "short string optimization" instead of
|
|
using Copy On Write (COW) is a superior approach for multicore
|
|
machines (particularly in C++11, which has rvalue references). Breaking
|
|
ABI compatibility with old versions of the library was
|
|
determined to be critical to achieving the performance goals of
|
|
libc++.</p></li>
|
|
|
|
<li><p>Mainline libstdc++ has switched to GPL3, a license which the developers
|
|
of libc++ cannot use. libstdc++ 4.2 (the last GPL2 version) could be
|
|
independently extended to support C++11, but this would be a fork of the
|
|
codebase (which is often seen as worse for a project than starting a new
|
|
independent one). Another problem with libstdc++ is that it is tightly
|
|
integrated with G++ development, tending to be tied fairly closely to the
|
|
matching version of G++.</p>
|
|
</li>
|
|
|
|
<li><p>STLport and the Apache libstdcxx library are two other popular
|
|
candidates, but both lack C++11 support. Our experience (and the
|
|
experience of libstdc++ developers) is that adding support for C++11 (in
|
|
particular rvalue references and move-only types) requires changes to
|
|
almost every class and function, essentially amounting to a rewrite.
|
|
Faced with a rewrite, we decided to start from scratch and evaluate every
|
|
design decision from first principles based on experience.</p>
|
|
|
|
<p>Further, both projects are apparently abandoned: STLport 5.2.1 was
|
|
released in Oct'08, and STDCXX 4.2.1 in May'08.</p>
|
|
|
|
</ul>
|
|
|
|
<!--=====================================================================-->
|
|
<h2 id="requirements">Platform Support</h2>
|
|
<!--=====================================================================-->
|
|
|
|
<p>
|
|
libc++ is known to work on the following platforms, using g++ and
|
|
clang. Note that functionality provided by <atomic> is only functional with
|
|
clang.
|
|
</p>
|
|
|
|
<ul>
|
|
<li>Mac OS X i386</li>
|
|
<li>Mac OS X x86_64</li>
|
|
<li>FreeBSD 10+ i386</li>
|
|
<li>FreeBSD 10+ x86_64</li>
|
|
<li>FreeBSD 10+ ARM</li>
|
|
<li>Linux i386</li>
|
|
<li>Linux x86_64</li>
|
|
</ul>
|
|
|
|
<!--=====================================================================-->
|
|
<h2 id="dir-structure">Current Status</h2>
|
|
<!--=====================================================================-->
|
|
|
|
<p>libc++ is a 100% complete C++11 implementation on Apple's OS X. </p>
|
|
<p>LLVM and Clang can self host in C++ and C++11 mode with libc++ on Linux.</p>
|
|
<p>libc++ is also a 100% complete C++14 implementation. A list of new features and
|
|
changes for C++14 can be found <a href="cxx1y_status.html">here</a>.</p>
|
|
<p>libc++'s C++17 implementation is not yet complete. A list of features and changes
|
|
for C++17 can be found <a href="cxx1z_status.html">here</a>.</p>
|
|
<p>A list of features and changes for the next C++ standard, known here as
|
|
"C++2a" (probably to be C++20) can be found <a href="cxx2a_status.html">here</a>.</p>
|
|
<p>Implementation of the post-C++14 Technical Specifications is in progress. A list of features
|
|
and the current status of these features can be found <a href="ts1z_status.html">here</a>.</p>
|
|
<p>As features get moved from the Technical Specifications into the main standard, we
|
|
will (after a period for migration) remove them from the TS implementation. This
|
|
process is detailed <a href="DesignDocs/ExperimentalFeatures.html">here</a>.</p>
|
|
|
|
<!--======================================================================-->
|
|
<h2 id="buildbots">Build Bots</h2>
|
|
<!--======================================================================-->
|
|
<p>The latest libc++ build results can be found at the following locations.</p>
|
|
<ul>
|
|
<li><a href="http://lab.llvm.org:8011/console">
|
|
Buildbot libc++ builders
|
|
</a></li>
|
|
<li><a href="http://lab.llvm.org:8080/green/view/Libcxx/">
|
|
Jenkins libc++ builders
|
|
</a></li>
|
|
</ul>
|
|
|
|
<!--=====================================================================-->
|
|
<h2>Get it and get involved!</h2>
|
|
<!--=====================================================================-->
|
|
|
|
<p>First please review our
|
|
<a href="https://llvm.org/docs/DeveloperPolicy.html">Developer's Policy</a>.
|
|
|
|
The documentation for building and using libc++ can be found below.
|
|
<ul>
|
|
<li><a href="https://libcxx.llvm.org/docs/UsingLibcxx.html">
|
|
<b>Using libc++</b></a>
|
|
Documentation on using the library in your programs</li>
|
|
<li><a href="https://libcxx.llvm.org/docs/BuildingLibcxx.html">
|
|
<b>Building libc++</b></a>
|
|
Documentation on building the library using CMake</li>
|
|
<li><a href="https://libcxx.llvm.org/docs/TestingLibcxx.html">
|
|
<b>Testing libc++</b></a>
|
|
Documentation for developers wishing to test the library</li>
|
|
</ul>
|
|
|
|
<!--=====================================================================-->
|
|
<h3>Notes and Known Issues</h3>
|
|
<!--=====================================================================-->
|
|
|
|
<p>
|
|
<ul>
|
|
<li>
|
|
Building libc++ with <code>-fno-rtti</code> is not supported. However
|
|
linking against it with <code>-fno-rtti</code> is supported.
|
|
</li>
|
|
</ul>
|
|
</p>
|
|
|
|
<p>Send discussions to the
|
|
<a href="https://lists.llvm.org/mailman/listinfo/libcxx-dev">libc++ mailing list</a>.</p>
|
|
|
|
<!--=====================================================================-->
|
|
<h2>Bug reports and patches</h2>
|
|
<!--=====================================================================-->
|
|
|
|
<p>
|
|
If you think you've found a bug in libc++, please report it using
|
|
the <a href="https://bugs.llvm.org/">LLVM Bugzilla</a>. If you're not sure, you
|
|
can post a message to the <a href="https://lists.llvm.org/mailman/listinfo/libcxx-dev">libcxx-dev</a>
|
|
mailing list or on IRC.
|
|
</p>
|
|
|
|
<p>
|
|
If you want to contribute a patch to libc++, the best place for that is
|
|
<a href="https://llvm.org/docs/Phabricator.html">Phabricator</a>. Please
|
|
add libcxx-commits as a subscriber.
|
|
</p>
|
|
|
|
<!--=====================================================================-->
|
|
<h2>Design Documents</h2>
|
|
<!--=====================================================================-->
|
|
|
|
<ul>
|
|
<li><a href="atomic_design.html"><tt><atomic></tt></a></li>
|
|
<li><a href="type_traits_design.html"><tt><type_traits></tt></a></li>
|
|
<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>
|
|
</ul>
|
|
|
|
</div>
|
|
</body>
|
|
</html>
|