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5 <title>Advice on Packaging LLVM</title>
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7</head>
8<body>
9
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]10<h1>Advice on Packaging LLVM</h1>
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]11<ol>
12 <li><a href="#overview">Overview</a></li>
Jeffrey Yasskin0ca43f22010-02-26 18:03:43 +0000[diff] [blame]13 <li><a href="#compilation">Compile Flags</a></li>
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]14 <li><a href="#cxx-features">C++ Features</a></li>
15 <li><a href="#shared-library">Shared Library</a></li>
Jeffrey Yasskin0ca43f22010-02-26 18:03:43 +0000[diff] [blame]16 <li><a href="#deps">Dependencies</a></li>
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]17</ol>
18
19<!--=========================================================================-->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]20<h2><a name="overview">Overview</a></h2>
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]21<!--=========================================================================-->
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]22<div>
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]23
24<p>LLVM sets certain default configure options to make sure our developers don't
25break things for constrained platforms. These settings are not optimal for most
Jeffrey Yasskin2058a712010-02-26 22:25:06 +0000[diff] [blame]26desktop systems, and we hope that packagers (e.g., Redhat, Debian, MacPorts,
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]27etc.) will tweak them. This document lists settings we suggest you tweak.
28</p>
Jeffrey Yasskin0ca43f22010-02-26 18:03:43 +0000[diff] [blame]29
30<p>LLVM's API changes with each release, so users are likely to want, for
31example, both LLVM-2.6 and LLVM-2.7 installed at the same time to support apps
32developed against each.
33</p>
34</div>
35
36<!--=========================================================================-->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]37<h2><a name="compilation">Compile Flags</a></h2>
Jeffrey Yasskin0ca43f22010-02-26 18:03:43 +0000[diff] [blame]38<!--=========================================================================-->
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]39<div>
Jeffrey Yasskin0ca43f22010-02-26 18:03:43 +0000[diff] [blame]40
41<p>LLVM runs much more quickly when it's optimized and assertions are removed.
42However, such a build is currently incompatible with users who build without
43defining NDEBUG, and the lack of assertions makes it hard to debug problems in
44user code. We recommend allowing users to install both optimized and debug
45versions of LLVM in parallel. The following configure flags are relevant:
46</p>
47
48<dl>
49 <dt><tt>--disable-assertions</tt></dt><dd>Builds LLVM with <tt>NDEBUG</tt>
50 defined. Changes the LLVM ABI. Also available by setting
51 <tt>DISABLE_ASSERTIONS=0|1</tt> in <tt>make</tt>'s environment. This defaults
52 to enabled regardless of the optimization setting, but it slows things
53 down.</dd>
54
55 <dt><tt>--enable-debug-symbols</tt></dt><dd>Builds LLVM with <tt>-g</tt>.
56 Also available by setting <tt>DEBUG_SYMBOLS=0|1</tt> in <tt>make</tt>'s
57 environment. This defaults to disabled when optimizing, so you should turn it
58 back on to let users debug their programs.</dd>
59
60 <dt><tt>--enable-optimized</tt></dt><dd>(For svn checkouts) Builds LLVM with
61 <tt>-O2</tt> and, by default, turns off debug symbols. Also available by
62 setting <tt>ENABLE_OPTIMIZED=0|1</tt> in <tt>make</tt>'s environment. This
63 defaults to enabled when not in a checkout.</dd>
64</dl>
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]65</div>
66
67<!--=========================================================================-->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]68<h2><a name="cxx-features">C++ Features</a></h2>
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]69<!--=========================================================================-->
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]70<div>
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]71
72<dl>
73 <dt>RTTI</dt><dd>LLVM disables RTTI by default. Add <tt>REQUIRES_RTTI=1</tt>
74 to your environment while running <tt>make</tt> to re-enable it. This will
Jeffrey Yasskin3ca304a2010-02-26 20:43:33 +0000[diff] [blame]75 allow users to build with RTTI enabled and still inherit from LLVM
76 classes.</dd>
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]77</dl>
78</div>
79
80<!--=========================================================================-->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]81<h2><a name="shared-library">Shared Library</a></h2>
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]82<!--=========================================================================-->
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]83<div>
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]84
85<p>Configure with <tt>--enable-shared</tt> to build
86<tt>libLLVM-<var>major</var>.<var>minor</var>.(so|dylib)</tt> and link the tools
87against it. This saves lots of binary size at the cost of some startup time.
88</p>
89</div>
90
Jeffrey Yasskin0ca43f22010-02-26 18:03:43 +0000[diff] [blame]91<!--=========================================================================-->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]92<h2><a name="deps">Dependencies</a></h2>
Jeffrey Yasskin0ca43f22010-02-26 18:03:43 +0000[diff] [blame]93<!--=========================================================================-->
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]94<div>
Jeffrey Yasskin0ca43f22010-02-26 18:03:43 +0000[diff] [blame]95
96<dl>
97<dt><tt>--enable-libffi</tt></dt><dd>Depend on <a
98href="http://sources.redhat.com/libffi/">libffi</a> to allow the LLVM
99interpreter to call external functions.</dd>
100<dt><tt>--with-oprofile</tt></dt><dd>Depend on <a
101href="http://oprofile.sourceforge.net/doc/devel/index.html">libopagent</a>
102(>=version 0.9.4) to let the LLVM JIT tell oprofile about function addresses and
103line numbers.</dd>
104</dl>
105</div>
106
Jeffrey Yasskin0c0f4b62010-02-26 00:54:42 +0000[diff] [blame]107<!-- *********************************************************************** -->
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NAKAMURA Takumib9a33632011-04-09 02:13:37 +0000[diff] [blame]114 <a href="http://llvm.org/">The LLVM Compiler Infrastructure</a><br>
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