2010-08-22 03:04:38 +02:00
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2010-05-11 21:42:16 +02:00
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2010-08-22 03:04:38 +02:00
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2010-05-11 21:42:16 +02:00
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<label>Quick Links</label>
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2010-05-11 22:53:16 +02:00
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<a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits">cfe-commits</a>
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2010-05-11 21:42:16 +02:00
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2010-05-11 22:51:20 +02:00
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2010-05-11 21:42:16 +02:00
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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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2010-08-22 03:04:38 +02:00
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2010-05-11 21:42:16 +02:00
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<p>libc++ is a new implementation of the C++ standard library, targeting
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2012-07-19 17:57:51 +02:00
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C++11.</p>
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2010-05-11 21:42:16 +02:00
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2010-11-16 22:40:19 +01:00
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<p>All of the code in libc++ is <a
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href="http://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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2010-08-22 03:04:38 +02:00
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2010-05-11 21:42:16 +02:00
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<!--=====================================================================-->
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<h2 id="goals">Features and Goals</h2>
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<!--=====================================================================-->
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2010-08-22 03:04:38 +02:00
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2010-05-11 21:42:16 +02:00
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<ul>
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2012-07-19 17:57:51 +02:00
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<li>Correctness as defined by the C++11 standard.</li>
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2010-05-11 21:42:16 +02:00
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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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2010-05-13 00:21:15 +02:00
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<!--=====================================================================-->
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2012-11-14 17:31:15 +01:00
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<h2 id="why">Why a new C++ Standard Library for C++11?</h2>
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2010-05-13 00:21:15 +02:00
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<!--=====================================================================-->
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2010-08-22 03:04:38 +02:00
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2010-05-13 00:21:15 +02:00
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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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2010-08-22 03:04:38 +02:00
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2010-05-13 00:21:15 +02:00
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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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2012-11-14 17:31:15 +01:00
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machines (particularly in C++11, which has rvalue references). Breaking
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2010-05-13 00:30:22 +02:00
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ABI compatibility with old versions of the library was
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2010-05-13 00:21:15 +02:00
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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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2010-08-22 03:04:38 +02:00
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2010-05-13 00:21:15 +02:00
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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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2010-05-13 00:33:00 +02:00
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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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2010-05-13 00:21:15 +02:00
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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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2012-11-14 17:31:15 +01:00
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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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2010-05-13 00:21:15 +02:00
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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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2010-05-13 00:34:21 +02:00
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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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2010-08-22 03:04:38 +02:00
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2010-05-13 00:21:15 +02:00
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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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2010-05-11 21:42:16 +02:00
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<!--=====================================================================-->
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<h2 id="requirements">Platform Support</h2>
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<!--=====================================================================-->
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<p>libc++ is known to work on the following platforms, using g++-4.2 and
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2012-07-19 17:57:51 +02:00
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clang (lack of C++11 language support disables some functionality).</p>
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2010-05-11 21:42:16 +02:00
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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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</ul>
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<!--=====================================================================-->
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<h2 id="dir-structure">Current Status</h2>
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<!--=====================================================================-->
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2012-11-27 19:52:32 +01:00
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<p>libc++ is a 100% complete C++11 implementation on Apple's OS X. </p>
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2012-12-31 20:34:21 +01:00
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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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2013-08-13 16:58:39 +02:00
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<p>C++1Y (C++14) implementation is in progress. The current status is
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2013-08-13 16:59:44 +02:00
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<a href="cxx1y_status.html">here</a></p>
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2013-08-13 16:58:39 +02:00
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2011-09-28 17:44:39 +02:00
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<p>
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2012-07-31 23:30:28 +02:00
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Ports to other platforms are underway. Here are recent test
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results for <a href="results.Windows.html">Windows</a>
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and <a href="results.Linux.html">Linux</a>.
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2011-09-28 17:44:39 +02:00
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</p>
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2010-05-11 21:42:16 +02:00
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<!--=====================================================================-->
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<h2>Get it and get involved!</h2>
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<!--=====================================================================-->
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2010-08-22 03:04:38 +02:00
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2011-09-30 18:58:02 +02:00
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<p>First please review our
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<a href="http://llvm.org/docs/DeveloperPolicy.html">Developer's Policy</a>.
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2010-05-11 21:42:16 +02:00
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<p>To check out the code, use:</p>
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2010-05-11 21:42:16 +02:00
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<ul>
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2010-05-11 22:37:52 +02:00
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<li><code>svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx</code></li>
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2011-01-28 00:18:19 +01:00
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</ul>
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2011-11-17 18:14:16 +01:00
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<p>
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2012-11-06 22:31:37 +01:00
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On Mac OS 10.7 (Lion) and later, the easiest way to get this library is to install
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2011-11-17 18:14:16 +01:00
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Xcode 4.2 or later. However if you want to install tip-of-trunk from here
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2012-04-03 17:08:42 +02:00
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(getting the bleeding edge), read on. However, be warned that Mac OS
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10.7 will not boot without a valid copy of <code>libc++.1.dylib</code> in
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<code>/usr/lib</code>.
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2011-11-17 18:14:16 +01:00
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</p>
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2011-01-28 00:18:19 +01:00
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<p>
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Next:
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</p>
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<ul>
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<li><code>cd libcxx/lib</code></li>
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<li><code>export TRIPLE=-apple-</code></li>
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<li><code>./buildit</code></li>
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2012-11-06 22:31:37 +01:00
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<li><code>ln -sf libc++.1.dylib libc++.dylib</code></li>
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2011-01-28 00:18:19 +01:00
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</ul>
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<p>
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That should result in a libc++.1.dylib and libc++.dylib. The safest thing
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to do is to use it from where your libcxx is installed instead of replacing
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these in your Mac OS.
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</p>
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<p>
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To use your system-installed libc++ with clang you can:
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2011-01-28 00:18:19 +01:00
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</p>
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<ul>
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<li><code>clang++ -stdlib=libc++ test.cpp</code></li>
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<li><code>clang++ -std=c++11 -stdlib=libc++ test.cpp</code></li>
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2011-01-28 00:18:19 +01:00
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</ul>
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<p>
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2012-11-06 22:31:37 +01:00
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To use your tip-of-trunk libc++ on Mac OS with clang you can:
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2011-01-28 00:18:19 +01:00
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</p>
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<ul>
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<li><code>export DYLD_LIBRARY_PATH=<path-to-libcxx>/lib</code>
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<li><code>clang++ -std=c++11 -stdlib=libc++ -nostdinc++
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-I<path-to-libcxx>/include -L<path-to-libcxx>/lib
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test.cpp</code></li>
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2010-05-11 21:42:16 +02:00
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</ul>
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2012-08-22 02:57:11 +02:00
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<p>To run the libc++ test suite (recommended):</p>
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<ul>
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<li><code>cd libcxx/test</code></li>
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<li><code>./testit</code></li>
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2011-06-22 14:13:55 +02:00
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<ul>
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2012-11-06 22:31:37 +01:00
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<li>You can alter the command line options <code>testit</code> uses
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with <code>export OPTIONS="whatever you need"</code></li>
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2011-06-22 14:13:55 +02:00
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</ul>
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2010-05-11 21:42:16 +02:00
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</ul>
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2012-05-20 15:03:53 +02:00
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<!--=====================================================================-->
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<h3>Notes</h3>
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<!--=====================================================================-->
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<p>
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Building libc++ with <code>-fno-rtti</code> is not supported. However linking
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against it with <code>-fno-rtti</code> is supported.
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</p>
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2010-08-22 03:04:38 +02:00
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<p>Send discussions to the
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2010-05-11 21:53:34 +02:00
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(<a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">clang mailing list</a>).</p>
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2012-12-31 20:34:21 +01:00
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<!--=====================================================================-->
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<h2>Build on Linux using CMake and libsupc++.</h2>
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<!--=====================================================================-->
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<p>
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You will need libstdc++ in order to provide libsupc++.
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</p>
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<p>
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Figure out where the libsupc++ headers are on your system. On Ubuntu this
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is <code>/usr/include/c++/<version></code> and
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<code>/usr/include/c++/<version>/<target-triple></code>
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</p>
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<p>
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You can also figure this out by running
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<pre>
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$ echo | g++ -Wp,-v -x c++ - -fsyntax-only
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ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
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ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../x86_64-linux-gnu/include"
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#include "..." search starts here:
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#include <...> search starts here:
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/usr/include/c++/4.7
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/usr/include/c++/4.7/x86_64-linux-gnu
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/usr/include/c++/4.7/backward
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/usr/lib/gcc/x86_64-linux-gnu/4.7/include
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/usr/local/include
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/usr/lib/gcc/x86_64-linux-gnu/4.7/include-fixed
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/usr/include/x86_64-linux-gnu
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/usr/include
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End of search list.
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</pre>
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Note the first two entries happen to be what we are looking for. This
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may not be correct on other platforms.
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</p>
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<p>
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We can now run CMake:
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<ul>
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<li><code>CC=clang CXX=clang++ cmake -G "Unix Makefiles"
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-DLIBCXX_CXX_ABI=libsupc++
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-DLIBCXX_LIBSUPCXX_INCLUDE_PATHS="/usr/include/c++/4.7/;/usr/include/c++/4.7/x86_64-linux-gnu/"
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-DCMAKE_BUILD_TYPE=Release
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-DCMAKE_INSTALL_PREFIX=/usr
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<libc++-source-dir></code></li>
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<li><code>make</code></li>
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<li><code>sudo make install</code></li>
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</ul>
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<p>
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You can now run clang with -stdlib=libc++.
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</p>
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</p>
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2013-02-08 20:10:36 +01:00
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<!--=====================================================================-->
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<h2>Build on Linux using CMake and libc++abi.</h2>
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<!--=====================================================================-->
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<p>
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You will need to keep the source tree of <a href="http://libcxxabi.llvm.org">libc++abi</a>
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available on your build machine and your copy of the libc++abi shared library must
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be placed where your linker will find it.
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</p>
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<p>
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We can now run CMake:
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<ul>
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<li><code>CC=clang CXX=clang++ cmake -G "Unix Makefiles"
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-DLIBCXX_CXX_ABI=libcxxabi
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-DLIBCXX_LIBCXXABI_INCLUDE_PATHS="<libc++abi-source-dir>/include"
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-DCMAKE_BUILD_TYPE=Release
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-DCMAKE_INSTALL_PREFIX=/usr
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<libc++-source-dir></code></li>
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<li><code>make</code></li>
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<li><code>sudo make install</code></li>
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</ul>
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<p>
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Unfortunately you can't simply run clang with "-stdlib=libc++" at this point, as
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clang is set up to link for libc++ linked to libsupc++. To get around this
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you'll have to set up your linker yourself (or patch clang). For example,
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<ul>
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<li><code>clang++ -stdlib=libc++ helloworld.cpp -nodefaultlibs -lc++ -lc++abi -lm -lc -lgcc_s -lgcc</code></li>
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</ul>
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Alternately, you could just add libc++abi to your libraries list, which in most
|
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|
|
|
situations will give the same result:
|
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|
<ul>
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<li><code>clang++ -stdlib=libc++ helloworld.cpp -lc++abi</code></li>
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</ul>
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</p>
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</p>
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<!--=====================================================================-->
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|
<h2>Build on Linux using CMake and libcxxrt.</h2>
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|
<!--=====================================================================-->
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|
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|
|
|
|
|
<p>
|
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|
|
You will need to keep the source tree of
|
|
|
|
|
<a href="https://github.com/pathscale/libcxxrt/">libcxxrt</a> available
|
|
|
|
|
on your build machine and your copy of the libcxxrt shared library must
|
|
|
|
|
be placed where your linker will find it.
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<p>
|
|
|
|
|
We can now run CMake:
|
|
|
|
|
<ul>
|
|
|
|
|
<li><code>CC=clang CXX=clang++ cmake -G "Unix Makefiles"
|
|
|
|
|
-DLIBCXX_CXX_ABI=libcxxrt
|
2013-02-26 17:27:55 +01:00
|
|
|
-DLIBCXX_LIBCXXRT_INCLUDE_PATHS="<libcxxrt-source-dir>/src"
|
2013-02-08 20:10:36 +01:00
|
|
|
-DCMAKE_BUILD_TYPE=Release
|
|
|
|
|
-DCMAKE_INSTALL_PREFIX=/usr
|
|
|
|
|
<libc++-source-dir></code></li>
|
|
|
|
|
<li><code>make</code></li>
|
|
|
|
|
<li><code>sudo make install</code></li>
|
|
|
|
|
</ul>
|
|
|
|
|
<p>
|
|
|
|
|
Unfortunately you can't simply run clang with "-stdlib=libc++" at this point, as
|
|
|
|
|
clang is set up to link for libc++ linked to libsupc++. To get around this
|
|
|
|
|
you'll have to set up your linker yourself (or patch clang). For example,
|
|
|
|
|
<ul>
|
|
|
|
|
<li><code>clang++ -stdlib=libc++ helloworld.cpp -nodefaultlibs -lc++ -lcxxrt -lm -lc -lgcc_s -lgcc</code></li>
|
|
|
|
|
</ul>
|
|
|
|
|
Alternately, you could just add libcxxrt to your libraries list, which in most
|
|
|
|
|
situations will give the same result:
|
|
|
|
|
<ul>
|
|
|
|
|
<li><code>clang++ -stdlib=libc++ helloworld.cpp -lcxxrt</code></li>
|
|
|
|
|
</ul>
|
|
|
|
|
</p>
|
|
|
|
|
</p>
|
|
|
|
|
|
2010-10-05 18:44:40 +02:00
|
|
|
<!--=====================================================================-->
|
|
|
|
|
<h2>Design Documents</h2>
|
|
|
|
|
<!--=====================================================================-->
|
|
|
|
|
|
|
|
|
|
<ul>
|
|
|
|
|
<li><a href="atomic_design.html"><tt><atomic></tt></a></li>
|
2010-11-19 02:38:58 +01:00
|
|
|
<li><a href="type_traits_design.html"><tt><type_traits></tt></a></li>
|
2013-03-14 20:00:34 +01:00
|
|
|
<li><a href="http://cplusplusmusings.wordpress.com/2012/07/05/clang-and-standard-libraries-on-mac-os-x/">Excellent notes by Marshall Clow</a></li>
|
2013-03-14 19:37:48 +01:00
|
|
|
<li><a href="debug_mode.html">Status of debug mode</a></li>
|
2010-10-05 18:44:40 +02:00
|
|
|
</ul>
|
|
|
|
|
|
2010-05-11 21:42:16 +02:00
|
|
|
</div>
|
|
|
|
|
</body>
|
2010-05-11 22:37:52 +02:00
|
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|
</html>
|
