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ReleaseNotes: Note some changes to LLVM development infrastructure.

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@ -1032,6 +1032,45 @@ API changes are:</p>
</div>
<!--=========================================================================-->
<div class="doc_subsection">
<a name="devtree_changes">Development Infrastructure Changes</a>
</div>
<div class="doc_text">
<p>This section lists changes to the LLVM development infrastructure. This
mostly impacts users who actively work on LLVM or follow development on
mainline, but may also impact users who leverage the LLVM build infrastructure
or are interested in LLVM qualification.</p>
<ul>
<li>The default for <tt>make check</tt> is now to use
the <a href="http://llvm.org/cmds/lit.html">lit</a> testing tool, which is
part of LLVM itself. You can use <tt>lit</tt> directly as well, or use
the <tt>llvm-lit</tt> tool which is created as part of a Makefile or CMake
build (and knows how to find the appropriate tools). See the <tt>lit</tt>
documentation and the <a href="http://blog.llvm.org/2009/12/lit-it.html">blog
post</a>, and <a href="http://llvm.org/bugs/show_bug.cgi?id=5217">PR5217</a>
for more information.</li>
<li>The LLVM <tt>test-suite</tt> infrastructure has a new "simple" test format
(<tt>make TEST=simple</tt>). The new format is intended to require only a
compiler and not a full set of LLVM tools. This makes it useful for testing
released compilers, for running the test suite with other compilers (for
performance comparisons), and makes sure that we are testing the compiler as
users would see it. The new format is also designed to work using reference
outputs instead of comparison to a baseline compiler, which makes it run much
faster and makes it less system dependent.</li>
<li>Significant progress has been made on a new interface to running the
LLVM <tt>test-suite</tt> (aka the LLVM "nightly tests") using
the <a href="http://llvm.org/docs/lnt">LNT</a> infrastructure. The LNT
interface to the <tt>test-suite</tt> brings significantly improved reporting
capabilities for monitoring the correctness and generated code quality
produced by LLVM over time.</li>
</ul>
</div>
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<div class="doc_section">