Howard Hinnant | 3e1b042 | 2010-08-22 01:04:38 +0000 | [diff] [blame] | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" |
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Howard Hinnant | 3e1b042 | 2010-08-22 01:04:38 +0000 | [diff] [blame] | 17 | |
Howard Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 18 | <div class="submenu"> |
| 19 | <label>libc++ Info</label> |
| 20 | <a href="/index.html">About</a> |
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| 24 | <label>Quick Links</label> |
Chris Lattner | 3c9af34 | 2010-05-11 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 Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 27 | <a href="http://llvm.org/bugs/">Bug Reports</a> |
Howard Hinnant | 0017185 | 2010-05-11 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 Hinnant | c51e102 | 2010-05-11 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 Hinnant | 3e1b042 | 2010-08-22 01:04:38 +0000 | [diff] [blame] | 37 | |
Howard Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 38 | <p>libc++ is a new implementation of the C++ standard library, targeting |
Howard Hinnant | d04724c | 2012-07-19 15:57:51 +0000 | [diff] [blame] | 39 | C++11.</p> |
Howard Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 40 | |
Chris Lattner | 7b2aacc | 2010-11-16 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 Hinnant | 3e1b042 | 2010-08-22 01:04:38 +0000 | [diff] [blame] | 44 | |
Howard Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 45 | <!--=====================================================================--> |
| 46 | <h2 id="goals">Features and Goals</h2> |
| 47 | <!--=====================================================================--> |
Howard Hinnant | 3e1b042 | 2010-08-22 01:04:38 +0000 | [diff] [blame] | 48 | |
Howard Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 49 | <ul> |
Howard Hinnant | d04724c | 2012-07-19 15:57:51 +0000 | [diff] [blame] | 50 | <li>Correctness as defined by the C++11 standard.</li> |
Howard Hinnant | c51e102 | 2010-05-11 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 Clow | b6a04fe | 2012-11-14 16:31:15 +0000 | [diff] [blame] | 60 | <h2 id="why">Why a new C++ Standard Library for C++11?</h2> |
Chris Lattner | e2b0727 | 2010-05-12 22:21:15 +0000 | [diff] [blame] | 61 | <!--=====================================================================--> |
Howard Hinnant | 3e1b042 | 2010-08-22 01:04:38 +0000 | [diff] [blame] | 62 | |
Chris Lattner | e2b0727 | 2010-05-12 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 Hinnant | 3e1b042 | 2010-08-22 01:04:38 +0000 | [diff] [blame] | 67 | |
Chris Lattner | e2b0727 | 2010-05-12 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 Clow | b6a04fe | 2012-11-14 16:31:15 +0000 | [diff] [blame] | 75 | machines (particularly in C++11, which has rvalue references). Breaking |
Chris Lattner | c67061b | 2010-05-12 22:30:22 +0000 | [diff] [blame] | 76 | ABI compatibility with old versions of the library was |
Chris Lattner | e2b0727 | 2010-05-12 22:21:15 +0000 | [diff] [blame] | 77 | determined to be critical to achieving the performance goals of |
| 78 | libc++.</p></li> |
Howard Hinnant | 3e1b042 | 2010-08-22 01:04:38 +0000 | [diff] [blame] | 79 | |
Chris Lattner | e2b0727 | 2010-05-12 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 Clow | b6a04fe | 2012-11-14 16:31:15 +0000 | [diff] [blame] | 82 | independently extended to support C++11, but this would be a fork of the |
Chris Lattner | e7bdfe6 | 2010-05-12 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 Lattner | e2b0727 | 2010-05-12 22:21:15 +0000 | [diff] [blame] | 87 | </li> |
| 88 | |
| 89 | <li><p>STLport and the Apache libstdcxx library are two other popular |
Marshall Clow | b6a04fe | 2012-11-14 16:31:15 +0000 | [diff] [blame] | 90 | candidates, but both lack C++11 support. Our experience (and the |
Howard Hinnant | d04724c | 2012-07-19 15:57:51 +0000 | [diff] [blame] | 91 | experience of libstdc++ developers) is that adding support for C++11 (in |
Chris Lattner | e2b0727 | 2010-05-12 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 Lattner | 48035ce | 2010-05-12 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 Hinnant | 3e1b042 | 2010-08-22 01:04:38 +0000 | [diff] [blame] | 96 | |
Chris Lattner | e2b0727 | 2010-05-12 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 Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 103 | <h2 id="requirements">Platform Support</h2> |
| 104 | <!--=====================================================================--> |
| 105 | |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 106 | <p> |
| 107 | libc++ is known to work on the following platforms, using g++-4.2 and |
| 108 | clang (lack of C++11 language support disables some functionality). Note |
| 109 | that functionality provided by <atomic> is only functional with |
| 110 | clang. |
| 111 | </p> |
Howard Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 112 | |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 113 | <ul> |
| 114 | <li>Mac OS X i386</li> |
| 115 | <li>Mac OS X x86_64</li> |
| 116 | <li>FreeBSD 10+ i386</li> |
| 117 | <li>FreeBSD 10+ x86_64</li> |
| 118 | <li>FreeBSD 10+ ARM</li> |
| 119 | </ul> |
Howard Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 120 | |
| 121 | <!--=====================================================================--> |
| 122 | <h2 id="dir-structure">Current Status</h2> |
| 123 | <!--=====================================================================--> |
| 124 | |
Howard Hinnant | 09ce682 | 2012-11-27 18:52:32 +0000 | [diff] [blame] | 125 | <p>libc++ is a 100% complete C++11 implementation on Apple's OS X. </p> |
Michael J. Spencer | a86f97e | 2012-12-31 19:34:21 +0000 | [diff] [blame] | 126 | <p>LLVM and Clang can self host in C++ and C++11 mode with libc++ on Linux.</p> |
Marshall Clow | 979d36a | 2014-04-03 02:38:12 +0000 | [diff] [blame] | 127 | <p>libc++ is also a 100% complete C++14 implementation. A list of new features and changes for |
Marshall Clow | 6d44d71 | 2014-04-03 02:35:29 +0000 | [diff] [blame] | 128 | C++14 can be found <a href="cxx1y_status.html">here</a>.</p> |
Marshall Clow | bbec82d | 2014-06-02 23:37:13 +0000 | [diff] [blame] | 129 | <p>Implementation of the post-c++14 Technical Specifications is in progress. A list of features and |
| 130 | the current status of these features can be found <a href="ts1z_status.html">here</a>.</p> |
Howard Hinnant | 2347d2f | 2011-09-28 15:44:39 +0000 | [diff] [blame] | 131 | <p> |
Howard Hinnant | e1a0abb | 2012-07-31 21:30:28 +0000 | [diff] [blame] | 132 | Ports to other platforms are underway. Here are recent test |
| 133 | results for <a href="results.Windows.html">Windows</a> |
| 134 | and <a href="results.Linux.html">Linux</a>. |
Howard Hinnant | 2347d2f | 2011-09-28 15:44:39 +0000 | [diff] [blame] | 135 | </p> |
| 136 | |
Eric Fiselier | dc77010 | 2014-08-18 05:25:04 +0000 | [diff] [blame] | 137 | <!--======================================================================--> |
| 138 | <h2 id="dir-structure">Build Bots</h2> |
| 139 | <!--======================================================================--> |
| 140 | <p>These are the libc++ build bots</p> |
| 141 | <ul> |
| 142 | <li><a href="http://lab.llvm.org:8013/builders/libcxx_clang-x86_64-darwin11-RA"> |
| 143 | clang-libcxxabi-x86_64-darwin11 |
| 144 | </a></li> |
| 145 | <li><a href="http://llvm-amd64.freebsd.your.org/b/builders/libcxx-amd64-freebsd"> |
| 146 | clang-libcxxrt-x86_64-freebsd10 |
| 147 | </a></li> |
| 148 | <li><a href="http://llvm-amd64.freebsd.your.org/b/builders/libcxx-i386-freebsd"> |
| 149 | clang-libcxxrt-i386-freebsd10 |
| 150 | </a></li> |
| 151 | <li><a href="http://lab.llvm.org:8011/builders/libcxx-libcxxabi-x86_64-linux-debian"> |
| 152 | clang-libcxxabi-x86_64-linux-debian |
| 153 | </a></li> |
Eric Fiselier | 7b7ef16 | 2014-10-16 02:48:59 +0000 | [diff] [blame^] | 154 | <li><a href="http://http://lab.llvm.org:8011/builders/libcxx-libcxxabi-x86_64-linux-ubuntu"> |
| 155 | clang-libcxxabi-x86_64-linux-ubuntu |
| 156 | </a></li> |
Eric Fiselier | dc77010 | 2014-08-18 05:25:04 +0000 | [diff] [blame] | 157 | </ul> |
| 158 | |
Howard Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 159 | <!--=====================================================================--> |
| 160 | <h2>Get it and get involved!</h2> |
| 161 | <!--=====================================================================--> |
Howard Hinnant | 3e1b042 | 2010-08-22 01:04:38 +0000 | [diff] [blame] | 162 | |
Howard Hinnant | f0721aa | 2011-09-30 16:58:02 +0000 | [diff] [blame] | 163 | <p>First please review our |
| 164 | <a href="http://llvm.org/docs/DeveloperPolicy.html">Developer's Policy</a>. |
| 165 | |
Howard Hinnant | bec2fd5 | 2011-11-17 17:14:16 +0000 | [diff] [blame] | 166 | <p> |
Howard Hinnant | 79d6bcc | 2012-11-06 21:31:37 +0000 | [diff] [blame] | 167 | On Mac OS 10.7 (Lion) and later, the easiest way to get this library is to install |
Howard Hinnant | bec2fd5 | 2011-11-17 17:14:16 +0000 | [diff] [blame] | 168 | Xcode 4.2 or later. However if you want to install tip-of-trunk from here |
Howard Hinnant | 961a735 | 2012-04-03 15:08:42 +0000 | [diff] [blame] | 169 | (getting the bleeding edge), read on. However, be warned that Mac OS |
| 170 | 10.7 will not boot without a valid copy of <code>libc++.1.dylib</code> in |
| 171 | <code>/usr/lib</code>. |
Howard Hinnant | bec2fd5 | 2011-11-17 17:14:16 +0000 | [diff] [blame] | 172 | </p> |
| 173 | |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 174 | <p>To check out the code, use:</p> |
| 175 | |
Howard Hinnant | efc7aa2 | 2011-01-27 23:18:19 +0000 | [diff] [blame] | 176 | <ul> |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 177 | <li><code>svn co http://llvm.org/svn/llvm-project/libcxx/trunk libcxx</code></li> |
Howard Hinnant | efc7aa2 | 2011-01-27 23:18:19 +0000 | [diff] [blame] | 178 | </ul> |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 179 | |
Howard Hinnant | efc7aa2 | 2011-01-27 23:18:19 +0000 | [diff] [blame] | 180 | <p> |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 181 | Note that for an in-tree build, you should check out libcxx to |
| 182 | llvm/projects. |
Howard Hinnant | efc7aa2 | 2011-01-27 23:18:19 +0000 | [diff] [blame] | 183 | </p> |
| 184 | |
Howard Hinnant | efc7aa2 | 2011-01-27 23:18:19 +0000 | [diff] [blame] | 185 | <p> |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 186 | The following instructions are for building libc++ on FreeBSD, Linux, or Mac |
| 187 | using <a href="http://libcxxabi.llvm.org/">libc++abi</a> as the C++ ABI |
| 188 | library. On Linux, it is also possible to use |
| 189 | <a href="#libsupcxx">libsupc++</a> or <a href="#libcxxrt">libcxxrt</a>. |
| 190 | </p> |
| 191 | |
| 192 | <p>In-tree build:</p> |
| 193 | <ul> |
| 194 | <li>Check out libcxx and <a href="http://libcxxabi.llvm.org/">libcxxabi</a> |
| 195 | into llvm/projects</li> |
| 196 | <li><code>cd llvm</code></li> |
| 197 | <li><code>mkdir build && cd build</code></li> |
| 198 | <li><code>cmake .. # Linux may require -DCMAKE_C_COMPILER=clang |
| 199 | -DCMAKE_CXX_COMPILER=clang++</code></li> |
| 200 | <li><code>make cxx</code></li> |
| 201 | </ul> |
| 202 | |
| 203 | <p>Out-of-tree build:</p> |
| 204 | <ul> |
| 205 | <li>Check out libcxx</li> |
| 206 | <li>If not on a Mac, also check out |
| 207 | <a href="http://libcxxabi.llvm.org/">libcxxabi</a></li> |
| 208 | <li><code>cd libcxx</code></li> |
| 209 | <li><code>mkdir build && cd build</code></li> |
| 210 | <li><code>cmake -DLIBCXX_CXX_ABI=libcxxabi |
| 211 | -DLIBCXX_LIBCXXABI_INCLUDE_PATHS=path/to/libcxxabi/include |
| 212 | -DLIT_EXECUTABLE=path/to/llvm/utils/lit/lit.py .. # Linux may require |
| 213 | -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++</code></li> |
| 214 | <li><code>make</code></li> |
| 215 | </ul> |
| 216 | |
| 217 | <p>To run the tests:</p> |
| 218 | <ul> |
| 219 | <li><code>make check-libcxx</code></li> |
| 220 | </ul> |
| 221 | |
| 222 | <p>If you wish to run a subset of the test suite:</p> |
| 223 | <ul> |
| 224 | <li><code>cd path/to/libcxx/libcxx</code></li> |
| 225 | <li><code>alias lit='python path/to/llvm/utils/lit/lit.py'</code></li> |
| 226 | <li><code>ln -s path/to/build/dir/projects/libcxx/test/lit.site.cfg |
| 227 | test/lit.site.cfg</code></li> |
| 228 | <li><code>lit -sv test/re/ # or whichever subset of tests you're interested |
| 229 | in</code></li> |
| 230 | </ul> |
| 231 | <p>The above is currently quite inconvenient. Sorry! We're working on it!</p> |
| 232 | |
| 233 | <p>More information on using LIT can be found |
| 234 | <a href="http://llvm.org/docs/CommandGuide/lit.html">here</a>. For more |
| 235 | general information about the LLVM testing infrastructure, see the |
| 236 | <a href="http://llvm.org/docs/TestingGuide.html">LLVM Testing Infrastructure |
| 237 | Guide</a> |
| 238 | </p> |
| 239 | |
| 240 | <p> |
| 241 | Shared libraries for libc++ should now be present in llvm/build/lib. Note |
| 242 | that it is safest to use this from its current location rather than |
| 243 | replacing your system's libc++ (if it has one, if not, go right ahead). |
| 244 | </p> |
| 245 | |
| 246 | <p> |
| 247 | Mac users, remember to be careful when replacing the system's libc++. |
| 248 | <strong>Your system will not be able to boot without a funcioning |
| 249 | libc++.</strong> |
| 250 | </p> |
| 251 | |
| 252 | <!--=====================================================================--> |
| 253 | <h3>Notes</h3> |
| 254 | <!--=====================================================================--> |
| 255 | |
| 256 | <p> |
| 257 | Building libc++ with <code>-fno-rtti</code> is not supported. However |
| 258 | linking against it with <code>-fno-rtti</code> is supported. |
| 259 | </p> |
| 260 | |
| 261 | <p>Send discussions to the |
| 262 | <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">clang mailing list</a>.</p> |
| 263 | |
| 264 | <!--=====================================================================--> |
| 265 | <h2>Using libc++ in your programs</h2> |
| 266 | <!--=====================================================================--> |
| 267 | |
| 268 | <!--=====================================================================--> |
| 269 | <h3>FreeBSD and Mac OS X</h3> |
| 270 | <!--=====================================================================--> |
| 271 | |
| 272 | <p> |
| 273 | To use your system-installed libc++ with clang you can: |
Howard Hinnant | efc7aa2 | 2011-01-27 23:18:19 +0000 | [diff] [blame] | 274 | </p> |
| 275 | |
| 276 | <ul> |
| 277 | <li><code>clang++ -stdlib=libc++ test.cpp</code></li> |
Howard Hinnant | d04724c | 2012-07-19 15:57:51 +0000 | [diff] [blame] | 278 | <li><code>clang++ -std=c++11 -stdlib=libc++ test.cpp</code></li> |
Howard Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 279 | </ul> |
| 280 | |
Howard Hinnant | 79d6bcc | 2012-11-06 21:31:37 +0000 | [diff] [blame] | 281 | <p> |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 282 | To use your tip-of-trunk libc++ on Mac OS with clang you can: |
Howard Hinnant | 79d6bcc | 2012-11-06 21:31:37 +0000 | [diff] [blame] | 283 | </p> |
| 284 | |
| 285 | <ul> |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 286 | <li><code>export DYLD_LIBRARY_PATH=path/to/build/lib</code> |
Howard Hinnant | 79d6bcc | 2012-11-06 21:31:37 +0000 | [diff] [blame] | 287 | <li><code>clang++ -std=c++11 -stdlib=libc++ -nostdinc++ |
| 288 | -I<path-to-libcxx>/include -L<path-to-libcxx>/lib |
| 289 | test.cpp</code></li> |
| 290 | </ul> |
| 291 | |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 292 | <!--=====================================================================--> |
| 293 | <h3>Linux</h3> |
| 294 | <!--=====================================================================--> |
| 295 | |
| 296 | <p> |
| 297 | You will need to keep the source tree of |
| 298 | <a href="http://libcxxabi.llvm.org">libc++abi</a> available on your build |
| 299 | machine and your copy of the libc++abi shared library must be placed where |
| 300 | your linker will find it. |
| 301 | </p> |
| 302 | |
| 303 | <p> |
| 304 | Unfortunately you can't simply run clang with "-stdlib=libc++" at this |
| 305 | point, as clang is set up to link for libc++ linked to libsupc++. To get |
| 306 | around this you'll have to set up your linker yourself (or patch clang). |
| 307 | For example: |
| 308 | </p> |
Howard Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 309 | |
| 310 | <ul> |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 311 | <li><code>clang++ -stdlib=libc++ helloworld.cpp -nodefaultlibs -lc++ -lc++abi -lm -lc -lgcc_s -lgcc</code></li> |
Howard Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 312 | </ul> |
| 313 | |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 314 | <p> |
| 315 | Alternately, you could just add libc++abi to your libraries list, which in |
| 316 | most situations will give the same result: |
| 317 | </p> |
Howard Hinnant | 24147cf | 2012-05-20 13:03:53 +0000 | [diff] [blame] | 318 | |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 319 | <ul> |
| 320 | <li><code>clang++ -stdlib=libc++ helloworld.cpp -lc++abi</code></li> |
| 321 | </ul> |
Howard Hinnant | c5b02f2 | 2010-05-11 19:53:34 +0000 | [diff] [blame] | 322 | |
Howard Hinnant | bded6c9 | 2010-10-05 16:44:40 +0000 | [diff] [blame] | 323 | <!--=====================================================================--> |
Marshall Clow | f7cc9a1 | 2014-04-03 03:13:12 +0000 | [diff] [blame] | 324 | <h2>Bug reports and patches</h2> |
| 325 | <!--=====================================================================--> |
| 326 | |
| 327 | <p> |
| 328 | If you think you've found a bug in libc++, please report it using |
| 329 | the <a href="http://llvm.org/bugs">LLVM Bugzilla</a>. If you're not sure, you |
Marshall Clow | c15fec5 | 2014-04-07 07:28:33 +0000 | [diff] [blame] | 330 | can post a message to the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">cfe-dev</a> |
Marshall Clow | f7cc9a1 | 2014-04-03 03:13:12 +0000 | [diff] [blame] | 331 | mailing list or on IRC. Please include "libc++" in your subject. |
| 332 | </p> |
| 333 | |
| 334 | <p> |
| 335 | If you want to contribute a patch to libc++, the best place for that is the |
| 336 | <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits">cfe-commits</a> |
| 337 | mailing list. Please include "libc++" and "PATCH" in your subject. |
| 338 | </p> |
| 339 | |
| 340 | <!--=====================================================================--> |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 341 | <h2 id="libsupcxx">Build on Linux using CMake and libsupc++.</h2> |
Michael J. Spencer | a86f97e | 2012-12-31 19:34:21 +0000 | [diff] [blame] | 342 | <!--=====================================================================--> |
| 343 | |
| 344 | <p> |
| 345 | You will need libstdc++ in order to provide libsupc++. |
| 346 | </p> |
| 347 | |
| 348 | <p> |
| 349 | Figure out where the libsupc++ headers are on your system. On Ubuntu this |
| 350 | is <code>/usr/include/c++/<version></code> and |
| 351 | <code>/usr/include/c++/<version>/<target-triple></code> |
| 352 | </p> |
| 353 | |
| 354 | <p> |
| 355 | You can also figure this out by running |
| 356 | <pre> |
| 357 | $ echo | g++ -Wp,-v -x c++ - -fsyntax-only |
| 358 | ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu" |
| 359 | ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../x86_64-linux-gnu/include" |
| 360 | #include "..." search starts here: |
| 361 | #include <...> search starts here: |
| 362 | /usr/include/c++/4.7 |
| 363 | /usr/include/c++/4.7/x86_64-linux-gnu |
| 364 | /usr/include/c++/4.7/backward |
| 365 | /usr/lib/gcc/x86_64-linux-gnu/4.7/include |
| 366 | /usr/local/include |
| 367 | /usr/lib/gcc/x86_64-linux-gnu/4.7/include-fixed |
| 368 | /usr/include/x86_64-linux-gnu |
| 369 | /usr/include |
| 370 | End of search list. |
| 371 | </pre> |
| 372 | |
| 373 | Note the first two entries happen to be what we are looking for. This |
| 374 | may not be correct on other platforms. |
| 375 | </p> |
| 376 | |
| 377 | <p> |
| 378 | We can now run CMake: |
| 379 | <ul> |
| 380 | <li><code>CC=clang CXX=clang++ cmake -G "Unix Makefiles" |
Peter Collingbourne | 22dc63b | 2013-10-06 22:13:19 +0000 | [diff] [blame] | 381 | -DLIBCXX_CXX_ABI=libstdc++ |
Michael J. Spencer | a86f97e | 2012-12-31 19:34:21 +0000 | [diff] [blame] | 382 | -DLIBCXX_LIBSUPCXX_INCLUDE_PATHS="/usr/include/c++/4.7/;/usr/include/c++/4.7/x86_64-linux-gnu/" |
| 383 | -DCMAKE_BUILD_TYPE=Release |
| 384 | -DCMAKE_INSTALL_PREFIX=/usr |
| 385 | <libc++-source-dir></code></li> |
Peter Collingbourne | 22dc63b | 2013-10-06 22:13:19 +0000 | [diff] [blame] | 386 | <li>You can also substitute <code>-DLIBCXX_CXX_ABI=libsupc++</code> |
| 387 | above, which will cause the library to be linked to libsupc++ instead |
| 388 | of libstdc++, but this is only recommended if you know that you will |
| 389 | never need to link against libstdc++ in the same executable as libc++. |
| 390 | GCC ships libsupc++ separately but only as a static library. If a |
| 391 | program also needs to link against libstdc++, it will provide its |
| 392 | own copy of libsupc++ and this can lead to subtle problems. |
Michael J. Spencer | a86f97e | 2012-12-31 19:34:21 +0000 | [diff] [blame] | 393 | <li><code>make</code></li> |
| 394 | <li><code>sudo make install</code></li> |
| 395 | </ul> |
| 396 | <p> |
| 397 | You can now run clang with -stdlib=libc++. |
| 398 | </p> |
| 399 | </p> |
| 400 | |
| 401 | <!--=====================================================================--> |
Dan Albert | ce36936 | 2014-08-11 15:12:46 +0000 | [diff] [blame] | 402 | <h2 id="libcxxrt">Build on Linux using CMake and libcxxrt.</h2> |
Howard Hinnant | 8d3824d | 2013-02-08 19:10:36 +0000 | [diff] [blame] | 403 | <!--=====================================================================--> |
| 404 | |
| 405 | <p> |
| 406 | You will need to keep the source tree of |
| 407 | <a href="https://github.com/pathscale/libcxxrt/">libcxxrt</a> available |
| 408 | on your build machine and your copy of the libcxxrt shared library must |
| 409 | be placed where your linker will find it. |
| 410 | </p> |
| 411 | |
| 412 | <p> |
| 413 | We can now run CMake: |
| 414 | <ul> |
| 415 | <li><code>CC=clang CXX=clang++ cmake -G "Unix Makefiles" |
| 416 | -DLIBCXX_CXX_ABI=libcxxrt |
Howard Hinnant | 727ff91 | 2013-02-26 16:27:55 +0000 | [diff] [blame] | 417 | -DLIBCXX_LIBCXXRT_INCLUDE_PATHS="<libcxxrt-source-dir>/src" |
Howard Hinnant | 8d3824d | 2013-02-08 19:10:36 +0000 | [diff] [blame] | 418 | -DCMAKE_BUILD_TYPE=Release |
| 419 | -DCMAKE_INSTALL_PREFIX=/usr |
| 420 | <libc++-source-dir></code></li> |
| 421 | <li><code>make</code></li> |
| 422 | <li><code>sudo make install</code></li> |
| 423 | </ul> |
| 424 | <p> |
| 425 | Unfortunately you can't simply run clang with "-stdlib=libc++" at this point, as |
| 426 | clang is set up to link for libc++ linked to libsupc++. To get around this |
| 427 | you'll have to set up your linker yourself (or patch clang). For example, |
| 428 | <ul> |
| 429 | <li><code>clang++ -stdlib=libc++ helloworld.cpp -nodefaultlibs -lc++ -lcxxrt -lm -lc -lgcc_s -lgcc</code></li> |
| 430 | </ul> |
| 431 | Alternately, you could just add libcxxrt to your libraries list, which in most |
| 432 | situations will give the same result: |
| 433 | <ul> |
| 434 | <li><code>clang++ -stdlib=libc++ helloworld.cpp -lcxxrt</code></li> |
| 435 | </ul> |
| 436 | </p> |
| 437 | </p> |
| 438 | |
| 439 | <!--=====================================================================--> |
Howard Hinnant | bded6c9 | 2010-10-05 16:44:40 +0000 | [diff] [blame] | 440 | <h2>Design Documents</h2> |
| 441 | <!--=====================================================================--> |
| 442 | |
| 443 | <ul> |
| 444 | <li><a href="atomic_design.html"><tt><atomic></tt></a></li> |
Howard Hinnant | e20b8de | 2010-11-19 01:38:58 +0000 | [diff] [blame] | 445 | <li><a href="type_traits_design.html"><tt><type_traits></tt></a></li> |
Marshall Clow | 68aa6b4 | 2013-03-14 19:00:34 +0000 | [diff] [blame] | 446 | <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 Hinnant | 57724c3 | 2013-03-14 18:37:48 +0000 | [diff] [blame] | 447 | <li><a href="debug_mode.html">Status of debug mode</a></li> |
Howard Hinnant | bded6c9 | 2010-10-05 16:44:40 +0000 | [diff] [blame] | 448 | </ul> |
| 449 | |
Howard Hinnant | c51e102 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 450 | </div> |
| 451 | </body> |
Chris Lattner | e66f1e3 | 2010-05-11 20:37:52 +0000 | [diff] [blame] | 452 | </html> |