Jean-Daniel updates the libc++ index page to reflect not so recent changes in C++ standard status.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@160509 91177308-0d34-0410-b5e6-96231b3b80d8
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<!--*********************************************************************-->
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<p>libc++ is a new implementation of the C++ standard library, targeting
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C++0X.</p>
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C++11.</p>
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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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<!--=====================================================================-->
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<ul>
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<li>Correctness as defined by the (currently draft) C++0X standard.</li>
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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><p>STLport and the Apache libstdcxx library are two other popular
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candidates, but both lack C++'0x support. Our experience (and the
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experience of libstdc++ developers) is that adding support for C++0x (in
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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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<!--=====================================================================-->
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<p>libc++ is known to work on the following platforms, using g++-4.2 and
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clang (lack of C++0X language support disables some functionality).</p>
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clang (lack of C++11 language support disables some functionality).</p>
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<ul>
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<li>Mac OS X i386</li>
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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++0x -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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</ul>
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<p>To run the libc++ test suit (recommended):</p>
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math.h and inttypes.h, add "-U__STRICT_ANSI__" and
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"-D__STDC_FORMAT_MACROS" to the command line with:
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<blockquote>
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<pre>export OPTIONS="-std=c++0x -stdlib=libc++ -U__STRICT_ANSI__ -D__STDC_FORMAT_MACROS"</pre>
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<pre>export OPTIONS="-std=c++11 -stdlib=libc++ -U__STRICT_ANSI__ -D__STDC_FORMAT_MACROS"</pre>
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</blockquote></li>
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<li>People porting libc++ to other OSes will likely have to
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define similar macros.</li>
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