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Howard Hinnantd2bb0322010-08-22 01:04:38 +0000[diff] [blame]17
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]18 <div class="submenu">
19 <label>libc++ Info</label>
20 <a href="/index.html">About</a>
21 </div>
22
23 <div class="submenu">
24 <label>Quick Links</label>
Chris Lattnera535ffd2010-05-11 20:53:16 +0000[diff] [blame]25 <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">cfe-dev</a>
26 <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits">cfe-commits</a>
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]27 <a href="http://llvm.org/bugs/">Bug Reports</a>
Howard Hinnant76e1ffc2010-05-11 20:51:20 +0000[diff] [blame]28 <a href="http://llvm.org/svn/llvm-project/libcxx/trunk/">Browse SVN</a>
29 <a href="http://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse ViewVC</a>
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]30 </div>
31</div>
32
33<div id="content">
34 <!--*********************************************************************-->
35 <h1>"libc++" C++ Standard Library</h1>
36 <!--*********************************************************************-->
Howard Hinnantd2bb0322010-08-22 01:04:38 +0000[diff] [blame]37
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]38 <p>libc++ is a new implementation of the C++ standard library, targeting
Howard Hinnantaf347342012-07-19 15:57:51 +0000[diff] [blame]39 C++11.</p>
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]40
Chris Lattnerf38bc6e2010-11-16 21:40:19 +0000[diff] [blame]41 <p>All of the code in libc++ is <a
42 href="http://llvm.org/docs/DeveloperPolicy.html#license">dual licensed</a>
43 under the MIT license and the UIUC License (a BSD-like license).</p>
Howard Hinnantd2bb0322010-08-22 01:04:38 +0000[diff] [blame]44
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]45 <!--=====================================================================-->
46 <h2 id="goals">Features and Goals</h2>
47 <!--=====================================================================-->
Howard Hinnantd2bb0322010-08-22 01:04:38 +0000[diff] [blame]48
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]49 <ul>
Howard Hinnantaf347342012-07-19 15:57:51 +0000[diff] [blame]50 <li>Correctness as defined by the C++11 standard.</li>
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]51 <li>Fast execution.</li>
52 <li>Minimal memory use.</li>
53 <li>Fast compile times.</li>
54 <li>ABI compatibility with gcc's libstdc++ for some low-level features
55 such as exception objects, rtti and memory allocation.</li>
56 <li>Extensive unit tests.</li>
57 </ul>
58
59 <!--=====================================================================-->
Marshall Clowfaa17162012-11-14 16:31:15 +0000[diff] [blame]60 <h2 id="why">Why a new C++ Standard Library for C++11?</h2>
Chris Lattner24173b82010-05-12 22:21:15 +0000[diff] [blame]61 <!--=====================================================================-->
Howard Hinnantd2bb0322010-08-22 01:04:38 +0000[diff] [blame]62
Chris Lattner24173b82010-05-12 22:21:15 +0000[diff] [blame]63 <p>After its initial introduction, many people have asked "why start a new
64 library instead of contributing to an existing library?" (like Apache's
65 libstdcxx, GNU's libstdc++, STLport, etc). There are many contributing
66 reasons, but some of the major ones are:</p>
Howard Hinnantd2bb0322010-08-22 01:04:38 +0000[diff] [blame]67
Chris Lattner24173b82010-05-12 22:21:15 +0000[diff] [blame]68 <ul>
69 <li><p>From years of experience (including having implemented the standard
70 library before), we've learned many things about implementing
71 the standard containers which require ABI breakage and fundamental changes
72 to how they are implemented. For example, it is generally accepted that
73 building std::string using the "short string optimization" instead of
74 using Copy On Write (COW) is a superior approach for multicore
Marshall Clowfaa17162012-11-14 16:31:15 +0000[diff] [blame]75 machines (particularly in C++11, which has rvalue references). Breaking
Chris Lattnera5058d92010-05-12 22:30:22 +0000[diff] [blame]76 ABI compatibility with old versions of the library was
Chris Lattner24173b82010-05-12 22:21:15 +0000[diff] [blame]77 determined to be critical to achieving the performance goals of
78 libc++.</p></li>
Howard Hinnantd2bb0322010-08-22 01:04:38 +0000[diff] [blame]79
Chris Lattner24173b82010-05-12 22:21:15 +0000[diff] [blame]80 <li><p>Mainline libstdc++ has switched to GPL3, a license which the developers
81 of libc++ cannot use. libstdc++ 4.2 (the last GPL2 version) could be
Marshall Clowfaa17162012-11-14 16:31:15 +0000[diff] [blame]82 independently extended to support C++11, but this would be a fork of the
Chris Lattnerf3382492010-05-12 22:33:00 +0000[diff] [blame]83 codebase (which is often seen as worse for a project than starting a new
84 independent one). Another problem with libstdc++ is that it is tightly
85 integrated with G++ development, tending to be tied fairly closely to the
86 matching version of G++.</p>
Chris Lattner24173b82010-05-12 22:21:15 +0000[diff] [blame]87 </li>
88
89 <li><p>STLport and the Apache libstdcxx library are two other popular
Marshall Clowfaa17162012-11-14 16:31:15 +0000[diff] [blame]90 candidates, but both lack C++11 support. Our experience (and the
Howard Hinnantaf347342012-07-19 15:57:51 +0000[diff] [blame]91 experience of libstdc++ developers) is that adding support for C++11 (in
Chris Lattner24173b82010-05-12 22:21:15 +0000[diff] [blame]92 particular rvalue references and move-only types) requires changes to
93 almost every class and function, essentially amounting to a rewrite.
Chris Lattnerbfa808e2010-05-12 22:34:21 +0000[diff] [blame]94 Faced with a rewrite, we decided to start from scratch and evaluate every
95 design decision from first principles based on experience.</p>
Howard Hinnantd2bb0322010-08-22 01:04:38 +0000[diff] [blame]96
Chris Lattner24173b82010-05-12 22:21:15 +0000[diff] [blame]97 <p>Further, both projects are apparently abandoned: STLport 5.2.1 was
98 released in Oct'08, and STDCXX 4.2.1 in May'08.</p>
99
100 </ul>
101
102 <!--=====================================================================-->
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]103 <h2 id="requirements">Platform Support</h2>
104 <!--=====================================================================-->
105
106 <p>libc++ is known to work on the following platforms, using g++-4.2 and
Howard Hinnantaf347342012-07-19 15:57:51 +0000[diff] [blame]107 clang (lack of C++11 language support disables some functionality).</p>
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]108
109 <ul>
110 <li>Mac OS X i386</li>
111 <li>Mac OS X x86_64</li>
112 </ul>
113
114 <!--=====================================================================-->
115 <h2 id="dir-structure">Current Status</h2>
116 <!--=====================================================================-->
117
Howard Hinnantb0895ff2012-11-27 18:52:32 +0000[diff] [blame]118 <p>libc++ is a 100% complete C++11 implementation on Apple's OS X. </p>
Michael J. Spencerdb8a0302012-12-31 19:34:21 +0000[diff] [blame]119 <p>LLVM and Clang can self host in C++ and C++11 mode with libc++ on Linux.</p>
Marshall Clow874ec672014-04-03 02:38:12 +0000[diff] [blame]120 <p>libc++ is also a 100% complete C++14 implementation. A list of new features and changes for
Marshall Clowe4915d92014-04-03 02:35:29 +0000[diff] [blame]121 C++14 can be found <a href="cxx1y_status.html">here</a>.</p>
Howard Hinnant0cbb3a12011-09-28 15:44:39 +0000[diff] [blame]122 <p>
Howard Hinnantee7a0bf2012-07-31 21:30:28 +0000[diff] [blame]123 Ports to other platforms are underway. Here are recent test
124 results for <a href="results.Windows.html">Windows</a>
125 and <a href="results.Linux.html">Linux</a>.
Howard Hinnant0cbb3a12011-09-28 15:44:39 +0000[diff] [blame]126 </p>
127
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]128 <!--=====================================================================-->
129 <h2>Get it and get involved!</h2>
130 <!--=====================================================================-->
Howard Hinnantd2bb0322010-08-22 01:04:38 +0000[diff] [blame]131
Howard Hinnant2481cba2011-09-30 16:58:02 +0000[diff] [blame]132 <p>First please review our
133 <a href="http://llvm.org/docs/DeveloperPolicy.html">Developer's Policy</a>.
134
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]135 <p>To check out the code, use:</p>
Howard Hinnantd2bb0322010-08-22 01:04:38 +0000[diff] [blame]136
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]137 <ul>
Chris Lattner4b748952010-05-11 20:37:52 +0000[diff] [blame]138 <li><code>svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx</code></li>
Howard Hinnant65451f12011-01-27 23:18:19 +0000[diff] [blame]139 </ul>
140
Howard Hinnant704f09b2011-11-17 17:14:16 +0000[diff] [blame]141 <p>
Howard Hinnant22b781b2012-11-06 21:31:37 +0000[diff] [blame]142 On Mac OS 10.7 (Lion) and later, the easiest way to get this library is to install
Howard Hinnant704f09b2011-11-17 17:14:16 +0000[diff] [blame]143 Xcode 4.2 or later. However if you want to install tip-of-trunk from here
Howard Hinnant271a1c02012-04-03 15:08:42 +0000[diff] [blame]144 (getting the bleeding edge), read on. However, be warned that Mac OS
145 10.7 will not boot without a valid copy of <code>libc++.1.dylib</code> in
146 <code>/usr/lib</code>.
Howard Hinnant704f09b2011-11-17 17:14:16 +0000[diff] [blame]147 </p>
148
Howard Hinnant65451f12011-01-27 23:18:19 +0000[diff] [blame]149 <p>
150 Next:
151 </p>
152
153 <ul>
154 <li><code>cd libcxx/lib</code></li>
155 <li><code>export TRIPLE=-apple-</code></li>
156 <li><code>./buildit</code></li>
Howard Hinnant22b781b2012-11-06 21:31:37 +0000[diff] [blame]157 <li><code>ln -sf libc++.1.dylib libc++.dylib</code></li>
Howard Hinnant65451f12011-01-27 23:18:19 +0000[diff] [blame]158 </ul>
159
160 <p>
Howard Hinnant22b781b2012-11-06 21:31:37 +0000[diff] [blame]161 That should result in a libc++.1.dylib and libc++.dylib. The safest thing
162 to do is to use it from where your libcxx is installed instead of replacing
163 these in your Mac OS.
Howard Hinnant65451f12011-01-27 23:18:19 +0000[diff] [blame]164 </p>
165
Howard Hinnant65451f12011-01-27 23:18:19 +0000[diff] [blame]166 <p>
Howard Hinnant22b781b2012-11-06 21:31:37 +0000[diff] [blame]167 To use your system-installed libc++ with clang you can:
Howard Hinnant65451f12011-01-27 23:18:19 +0000[diff] [blame]168 </p>
169
170 <ul>
171 <li><code>clang++ -stdlib=libc++ test.cpp</code></li>
Howard Hinnantaf347342012-07-19 15:57:51 +0000[diff] [blame]172 <li><code>clang++ -std=c++11 -stdlib=libc++ test.cpp</code></li>
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]173 </ul>
174
Howard Hinnant22b781b2012-11-06 21:31:37 +0000[diff] [blame]175 <p>
176 To use your tip-of-trunk libc++ on Mac OS with clang you can:
177 </p>
178
179 <ul>
180 <li><code>export DYLD_LIBRARY_PATH=&lt;path-to-libcxx&gt;/lib</code>
181 <li><code>clang++ -std=c++11 -stdlib=libc++ -nostdinc++
182 -I&lt;path-to-libcxx&gt;/include -L&lt;path-to-libcxx&gt;/lib
183 test.cpp</code></li>
184 </ul>
185
Marshall Clow08a0b482012-08-22 00:57:11 +0000[diff] [blame]186 <p>To run the libc++ test suite (recommended):</p>
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]187
188 <ul>
Chris Lattner4b748952010-05-11 20:37:52 +0000[diff] [blame]189 <li><code>cd libcxx/test</code></li>
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]190 <li><code>./testit</code></li>
Howard Hinnantf5d76a72011-06-22 12:13:55 +0000[diff] [blame]191 <ul>
Howard Hinnant22b781b2012-11-06 21:31:37 +0000[diff] [blame]192 <li>You can alter the command line options <code>testit</code> uses
193 with <code>export OPTIONS="whatever you need"</code></li>
Howard Hinnantf5d76a72011-06-22 12:13:55 +0000[diff] [blame]194 </ul>
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]195 </ul>
196
Howard Hinnant51065652012-05-20 13:03:53 +0000[diff] [blame]197 <!--=====================================================================-->
198 <h3>Notes</h3>
199 <!--=====================================================================-->
200
201<p>
202Building libc++ with <code>-fno-rtti</code> is not supported. However linking
203against it with <code>-fno-rtti</code> is supported.
204</p>
205
Howard Hinnantd2bb0322010-08-22 01:04:38 +0000[diff] [blame]206 <p>Send discussions to the
Howard Hinnant8c217372010-05-11 19:53:34 +0000[diff] [blame]207 (<a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">clang mailing list</a>).</p>
208
Howard Hinnant56f0d5b2010-10-05 16:44:40 +0000[diff] [blame]209 <!--=====================================================================-->
Marshall Clow992f9d52014-04-03 03:13:12 +0000[diff] [blame]210 <h2>Bug reports and patches</h2>
211 <!--=====================================================================-->
212
213<p>
214If you think you've found a bug in libc++, please report it using
215the <a href="http://llvm.org/bugs">LLVM Bugzilla</a>. If you're not sure, you
Marshall Clow3f357192014-04-07 07:28:33 +0000[diff] [blame]216can post a message to the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">cfe-dev</a>
Marshall Clow992f9d52014-04-03 03:13:12 +0000[diff] [blame]217mailing list or on IRC. Please include "libc++" in your subject.
218</p>
219
220<p>
221If you want to contribute a patch to libc++, the best place for that is the
222<a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits">cfe-commits</a>
223mailing list. Please include "libc++" and "PATCH" in your subject.
224</p>
225
226 <!--=====================================================================-->
Michael J. Spencerdb8a0302012-12-31 19:34:21 +0000[diff] [blame]227 <h2>Build on Linux using CMake and libsupc++.</h2>
228 <!--=====================================================================-->
229
230 <p>
231 You will need libstdc++ in order to provide libsupc++.
232 </p>
233
234 <p>
235 Figure out where the libsupc++ headers are on your system. On Ubuntu this
236 is <code>/usr/include/c++/&lt;version&gt;</code> and
237 <code>/usr/include/c++/&lt;version&gt;/&lt;target-triple&gt;</code>
238 </p>
239
240 <p>
241 You can also figure this out by running
242 <pre>
243$ echo | g++ -Wp,-v -x c++ - -fsyntax-only
244ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
245ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../x86_64-linux-gnu/include"
246#include "..." search starts here:
247#include &lt;...&gt; search starts here:
248 /usr/include/c++/4.7
249 /usr/include/c++/4.7/x86_64-linux-gnu
250 /usr/include/c++/4.7/backward
251 /usr/lib/gcc/x86_64-linux-gnu/4.7/include
252 /usr/local/include
253 /usr/lib/gcc/x86_64-linux-gnu/4.7/include-fixed
254 /usr/include/x86_64-linux-gnu
255 /usr/include
256End of search list.
257 </pre>
258
259 Note the first two entries happen to be what we are looking for. This
260 may not be correct on other platforms.
261 </p>
262
263 <p>
264 We can now run CMake:
265 <ul>
266 <li><code>CC=clang CXX=clang++ cmake -G "Unix Makefiles"
Peter Collingbourned0d308f2013-10-06 22:13:19 +0000[diff] [blame]267 -DLIBCXX_CXX_ABI=libstdc++
Michael J. Spencerdb8a0302012-12-31 19:34:21 +0000[diff] [blame]268 -DLIBCXX_LIBSUPCXX_INCLUDE_PATHS="/usr/include/c++/4.7/;/usr/include/c++/4.7/x86_64-linux-gnu/"
269 -DCMAKE_BUILD_TYPE=Release
270 -DCMAKE_INSTALL_PREFIX=/usr
271 &lt;libc++-source-dir&gt;</code></li>
Peter Collingbourned0d308f2013-10-06 22:13:19 +0000[diff] [blame]272 <li>You can also substitute <code>-DLIBCXX_CXX_ABI=libsupc++</code>
273 above, which will cause the library to be linked to libsupc++ instead
274 of libstdc++, but this is only recommended if you know that you will
275 never need to link against libstdc++ in the same executable as libc++.
276 GCC ships libsupc++ separately but only as a static library. If a
277 program also needs to link against libstdc++, it will provide its
278 own copy of libsupc++ and this can lead to subtle problems.
Michael J. Spencerdb8a0302012-12-31 19:34:21 +0000[diff] [blame]279 <li><code>make</code></li>
280 <li><code>sudo make install</code></li>
281 </ul>
282 <p>
283 You can now run clang with -stdlib=libc++.
284 </p>
285 </p>
286
287 <!--=====================================================================-->
Howard Hinnantaf4d1612013-02-08 19:10:36 +0000[diff] [blame]288 <h2>Build on Linux using CMake and libc++abi.</h2>
289 <!--=====================================================================-->
290
291 <p>
292 You will need to keep the source tree of <a href="http://libcxxabi.llvm.org">libc++abi</a>
293 available on your build machine and your copy of the libc++abi shared library must
294 be placed where your linker will find it.
295 </p>
296
297 <p>
298 We can now run CMake:
299 <ul>
300 <li><code>CC=clang CXX=clang++ cmake -G "Unix Makefiles"
301 -DLIBCXX_CXX_ABI=libcxxabi
302 -DLIBCXX_LIBCXXABI_INCLUDE_PATHS="&lt;libc++abi-source-dir&gt;/include"
303 -DCMAKE_BUILD_TYPE=Release
304 -DCMAKE_INSTALL_PREFIX=/usr
305 &lt;libc++-source-dir&gt;</code></li>
306 <li><code>make</code></li>
307 <li><code>sudo make install</code></li>
308 </ul>
309 <p>
310 Unfortunately you can't simply run clang with "-stdlib=libc++" at this point, as
311 clang is set up to link for libc++ linked to libsupc++. To get around this
312 you'll have to set up your linker yourself (or patch clang). For example,
313 <ul>
314 <li><code>clang++ -stdlib=libc++ helloworld.cpp -nodefaultlibs -lc++ -lc++abi -lm -lc -lgcc_s -lgcc</code></li>
315 </ul>
316 Alternately, you could just add libc++abi to your libraries list, which in most
317 situations will give the same result:
318 <ul>
319 <li><code>clang++ -stdlib=libc++ helloworld.cpp -lc++abi</code></li>
320 </ul>
321 </p>
322 </p>
323
324 <!--=====================================================================-->
325 <h2>Build on Linux using CMake and libcxxrt.</h2>
326 <!--=====================================================================-->
327
328 <p>
329 You will need to keep the source tree of
330 <a href="https://github.com/pathscale/libcxxrt/">libcxxrt</a> available
331 on your build machine and your copy of the libcxxrt shared library must
332 be placed where your linker will find it.
333 </p>
334
335 <p>
336 We can now run CMake:
337 <ul>
338 <li><code>CC=clang CXX=clang++ cmake -G "Unix Makefiles"
339 -DLIBCXX_CXX_ABI=libcxxrt
Howard Hinnantfae54b92013-02-26 16:27:55 +0000[diff] [blame]340 -DLIBCXX_LIBCXXRT_INCLUDE_PATHS="&lt;libcxxrt-source-dir&gt;/src"
Howard Hinnantaf4d1612013-02-08 19:10:36 +0000[diff] [blame]341 -DCMAKE_BUILD_TYPE=Release
342 -DCMAKE_INSTALL_PREFIX=/usr
343 &lt;libc++-source-dir&gt;</code></li>
344 <li><code>make</code></li>
345 <li><code>sudo make install</code></li>
346 </ul>
347 <p>
348 Unfortunately you can't simply run clang with "-stdlib=libc++" at this point, as
349 clang is set up to link for libc++ linked to libsupc++. To get around this
350 you'll have to set up your linker yourself (or patch clang). For example,
351 <ul>
352 <li><code>clang++ -stdlib=libc++ helloworld.cpp -nodefaultlibs -lc++ -lcxxrt -lm -lc -lgcc_s -lgcc</code></li>
353 </ul>
354 Alternately, you could just add libcxxrt to your libraries list, which in most
355 situations will give the same result:
356 <ul>
357 <li><code>clang++ -stdlib=libc++ helloworld.cpp -lcxxrt</code></li>
358 </ul>
359 </p>
360 </p>
361
362 <!--=====================================================================-->
Howard Hinnant56f0d5b2010-10-05 16:44:40 +0000[diff] [blame]363 <h2>Design Documents</h2>
364 <!--=====================================================================-->
365
366<ul>
367<li><a href="atomic_design.html"><tt>&lt;atomic&gt;</tt></a></li>
Howard Hinnant9835d762010-11-19 01:38:58 +0000[diff] [blame]368<li><a href="type_traits_design.html"><tt>&lt;type_traits&gt;</tt></a></li>
Marshall Clowe47bc9b2013-03-14 19:00:34 +0000[diff] [blame]369<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>
Howard Hinnantc7cbe502013-03-14 18:37:48 +0000[diff] [blame]370<li><a href="debug_mode.html">Status of debug mode</a></li>
Howard Hinnant56f0d5b2010-10-05 16:44:40 +0000[diff] [blame]371</ul>
372
Howard Hinnantbc8d3f92010-05-11 19:42:16 +0000[diff] [blame]373</div>
374</body>
Chris Lattner4b748952010-05-11 20:37:52 +0000[diff] [blame]375</html>