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[WWW] Add a section to Getting Started about building out-of-tree 

llvm-svn: 307704
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Philip Pfaffe 2017-07-11 20:37:28 +00:00
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polly/www/get_started.html
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@ -53,6 +53,18 @@ cmake ../llvm_git && make
<pre>make check-polly</pre>
<h3>Building Polly Without LLVM</h3>
It is also possible to build Polly without
also building LLVM. All you need is an installed version of LLVM or a previous
build. To configure Polly to use a pre-built LLVM, set the
<code>-DCMAKE_PREFIX_PATH</code> option:
<pre>cmake -DCMAKE_PREFIX_PATH=${LLVM_PREFIX}/lib/cmake/llvm</pre>
To run unittests, however, you need to have the LLVM source directory around.
Polly will use the <code>llvm-config</code> of the LLVM you're building against
to guess the location of the source directory. You may override autodetected
location by setting the <code>-DLLVM_SOURCE_ROOT</code> option.
<h3> Troubleshooting</h3>