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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>Advice on Packaging LLVM</title>
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<link rel="stylesheet" href="llvm.css" type="text/css">
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</head>
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<body>
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<h1>Advice on Packaging LLVM</h1>
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<ol>
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<li><a href="#overview">Overview</a></li>
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<li><a href="#compilation">Compile Flags</a></li>
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<li><a href="#cxx-features">C++ Features</a></li>
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<li><a href="#shared-library">Shared Library</a></li>
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<li><a href="#deps">Dependencies</a></li>
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</ol>
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<!--=========================================================================-->
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<h2><a name="overview">Overview</a></h2>
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<!--=========================================================================-->
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<div>
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<p>LLVM sets certain default configure options to make sure our developers don't
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break things for constrained platforms. These settings are not optimal for most
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desktop systems, and we hope that packagers (e.g., Redhat, Debian, MacPorts,
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etc.) will tweak them. This document lists settings we suggest you tweak.
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</p>
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<p>LLVM's API changes with each release, so users are likely to want, for
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example, both LLVM-2.6 and LLVM-2.7 installed at the same time to support apps
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developed against each.
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</p>
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</div>
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<!--=========================================================================-->
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<h2><a name="compilation">Compile Flags</a></h2>
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<!--=========================================================================-->
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<div>
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<p>LLVM runs much more quickly when it's optimized and assertions are removed.
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However, such a build is currently incompatible with users who build without
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defining NDEBUG, and the lack of assertions makes it hard to debug problems in
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user code. We recommend allowing users to install both optimized and debug
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versions of LLVM in parallel. The following configure flags are relevant:
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</p>
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<dl>
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<dt><tt>--disable-assertions</tt></dt><dd>Builds LLVM with <tt>NDEBUG</tt>
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defined. Changes the LLVM ABI. Also available by setting
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<tt>DISABLE_ASSERTIONS=0|1</tt> in <tt>make</tt>'s environment. This defaults
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to enabled regardless of the optimization setting, but it slows things
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down.</dd>
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<dt><tt>--enable-debug-symbols</tt></dt><dd>Builds LLVM with <tt>-g</tt>.
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Also available by setting <tt>DEBUG_SYMBOLS=0|1</tt> in <tt>make</tt>'s
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environment. This defaults to disabled when optimizing, so you should turn it
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back on to let users debug their programs.</dd>
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<dt><tt>--enable-optimized</tt></dt><dd>(For svn checkouts) Builds LLVM with
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<tt>-O2</tt> and, by default, turns off debug symbols. Also available by
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setting <tt>ENABLE_OPTIMIZED=0|1</tt> in <tt>make</tt>'s environment. This
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defaults to enabled when not in a checkout.</dd>
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</dl>
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</div>
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<!--=========================================================================-->
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<h2><a name="cxx-features">C++ Features</a></h2>
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<!--=========================================================================-->
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<div>
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<dl>
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<dt>RTTI</dt><dd>LLVM disables RTTI by default. Add <tt>REQUIRES_RTTI=1</tt>
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to your environment while running <tt>make</tt> to re-enable it. This will
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allow users to build with RTTI enabled and still inherit from LLVM
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classes.</dd>
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</dl>
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</div>
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<!--=========================================================================-->
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<h2><a name="shared-library">Shared Library</a></h2>
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<!--=========================================================================-->
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<div>
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<p>Configure with <tt>--enable-shared</tt> to build
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<tt>libLLVM-<var>major</var>.<var>minor</var>.(so|dylib)</tt> and link the tools
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against it. This saves lots of binary size at the cost of some startup time.
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</p>
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</div>
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<!--=========================================================================-->
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<h2><a name="deps">Dependencies</a></h2>
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<!--=========================================================================-->
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<div>
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<dl>
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<dt><tt>--enable-libffi</tt></dt><dd>Depend on <a
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href="http://sources.redhat.com/libffi/">libffi</a> to allow the LLVM
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interpreter to call external functions.</dd>
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<dt><tt>--with-oprofile</tt></dt><dd>Depend on <a
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href="http://oprofile.sourceforge.net/doc/devel/index.html">libopagent</a>
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(>=version 0.9.4) to let the LLVM JIT tell oprofile about function addresses and
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line numbers.</dd>
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</dl>
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</div>
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<!-- *********************************************************************** -->
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<hr>
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<address>
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<a href="http://llvm.org/">The LLVM Compiler Infrastructure</a><br>
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Last modified: $Date$
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