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[CMake] Fix c++ abi library configuration on Linux.

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You can now configure from the command line using:
-DLIBCXX_CXX_ABI=libsupc++
-DLIBCXX_LIBSUPCXX_INCLUDE_PATHS="path;path

Also documents how to build on Linux.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@171316 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer
2012-12-31 19:34:21 +00:00
parent ed9f69d342
commit db8a030bd3
3 changed files with 69 additions and 5 deletions
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55
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@@ -116,6 +116,7 @@
<!--=====================================================================-->
<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>
Ports to other platforms are underway. Here are recent test
@@ -204,6 +205,60 @@ against it with <code>-fno-rtti</code> is supported.
<p>Send discussions to the
(<a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">clang mailing list</a>).</p>
<!--=====================================================================-->
<h2>Build on Linux using CMake and libsupc++.</h2>
<!--=====================================================================-->
<p>
You will need libstdc++ in order to provide libsupc++.
</p>
<p>
Figure out where the libsupc++ headers are on your system. On Ubuntu this
is <code>/usr/include/c++/&lt;version&gt;</code> and
<code>/usr/include/c++/&lt;version&gt;/&lt;target-triple&gt;</code>
</p>
<p>
You can also figure this out by running
<pre>
$ echo | g++ -Wp,-v -x c++ - -fsyntax-only
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include &lt;...&gt; search starts here:
/usr/include/c++/4.7
/usr/include/c++/4.7/x86_64-linux-gnu
/usr/include/c++/4.7/backward
/usr/lib/gcc/x86_64-linux-gnu/4.7/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/4.7/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
</pre>
Note the first two entries happen to be what we are looking for. This
may not be correct on other platforms.
</p>
<p>
We can now run CMake:
<ul>
<li><code>CC=clang CXX=clang++ cmake -G "Unix Makefiles"
-DLIBCXX_CXX_ABI=libsupc++
-DLIBCXX_LIBSUPCXX_INCLUDE_PATHS="/usr/include/c++/4.7/;/usr/include/c++/4.7/x86_64-linux-gnu/"
-DCMAKE_BUILD_TYPE=Release
-DCMAKE_INSTALL_PREFIX=/usr
&lt;libc++-source-dir&gt;</code></li>
<li><code>make</code></li>
<li><code>sudo make install</code></li>
</ul>
<p>
You can now run clang with -stdlib=libc++.
</p>
</p>
<!--=====================================================================-->
<h2>Design Documents</h2>
<!--=====================================================================-->