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Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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Guochun Shi	b65a78e	2002-07-17 23:05:56 +0000	[diff] [blame]	3	<html>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	4	<head>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	5	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	6	<title>Getting Started with LLVM System</title>
				7	<link rel="stylesheet" href="llvm.css" type="text/css">
				8	</head>
				9	<body>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	10
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	11	<div class="doc_title">
				12	Getting Started with the LLVM System
				13	</div>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	14
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	15	<ul>
				16	<li><a href="#overview">Overview</a>
				17	<li><a href="#quickstart">Getting Started Quickly (A Summary)</a>
				18	<li><a href="#requirements">Requirements</a>
Chris Lattner	c0bda0d	2003-02-14 04:22:13 +0000	[diff] [blame]	19	<ol>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	20	<li><a href="#hardware">Hardware</a>
				21	<li><a href="#software">Software</a>
Chris Lattner	e0050f0	2004-07-18 22:32:22 +0000	[diff] [blame]	22	<li><a href="#brokengcc">Broken versions of GCC</a>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	23	</ol></li>
John Criswell	3ef61af	2003-06-30 21:59:07 +0000	[diff] [blame]	24
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	25	<li><a href="#starting">Getting Started with LLVM</a>
John Criswell	71139f2	2003-07-08 20:35:59 +0000	[diff] [blame]	26	<ol>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	27	<li><a href="#terminology">Terminology and Notation</a>
				28	<li><a href="#environment">Setting Up Your Environment</a>
				29	<li><a href="#unpack">Unpacking the LLVM Archives</a>
				30	<li><a href="#checkout">Checkout LLVM from CVS</a>
				31	<li><a href="#installcf">Install the GCC Front End</a>
				32	<li><a href="#config">Local LLVM Configuration</a>
				33	<li><a href="#compile">Compiling the LLVM Suite Source Code</a>
Reid Spencer	734b74f	2006-07-27 06:41:31 +0000	[diff] [blame]	34	<li><a href="#cross-compile">Cross-Compiling LLVM</a>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	35	<li><a href="#objfiles">The Location of LLVM Object Files</a>
Chris Lattner	998c067	2004-03-25 20:38:40 +0000	[diff] [blame]	36	<li><a href="#optionalconfig">Optional Configuration Items</a>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	37	</ol></li>
John Criswell	71139f2	2003-07-08 20:35:59 +0000	[diff] [blame]	38
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	39	<li><a href="#layout">Program layout</a>
				40	<ol>
				41	<li><a href="#cvsdir"><tt>CVS</tt> directories</a>
Reid Spencer	5be4f04	2004-12-08 16:18:26 +0000	[diff] [blame]	42	<li><a href="#examples"><tt>llvm/examples</tt></a>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	43	<li><a href="#include"><tt>llvm/include</tt></a>
				44	<li><a href="#lib"><tt>llvm/lib</tt></a>
Reid Spencer	5be4f04	2004-12-08 16:18:26 +0000	[diff] [blame]	45	<li><a href="#projects"><tt>llvm/projects</tt></a>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	46	<li><a href="#runtime"><tt>llvm/runtime</tt></a>
				47	<li><a href="#test"><tt>llvm/test</tt></a>
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	48	<li><a href="#llvmtest"><tt>llvm-test</tt></a>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	49	<li><a href="#tools"><tt>llvm/tools</tt></a>
				50	<li><a href="#utils"><tt>llvm/utils</tt></a>
Reid Spencer	5be4f04	2004-12-08 16:18:26 +0000	[diff] [blame]	51	<li><a href="#win32"><tt>llvm/win32</tt></a>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	52	</ol></li>
John Criswell	f531f31	2003-10-27 18:18:16 +0000	[diff] [blame]	53
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	54	<li><a href="#tutorial">An Example Using the LLVM Tool Chain</a>
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	55	<ol>
				56	<li><a href="#tutorial4">Example with llvm-gcc4</a></li>
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	57	</ol>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	58	<li><a href="#problems">Common Problems</a>
				59	<li><a href="#links">Links</a>
				60	</ul>
				61
Chris Lattner	020e1fc	2004-05-23 21:07:27 +0000	[diff] [blame]	62	<div class="doc_author">
				63	<p>Written by:
				64	<a href="mailto:criswell@uiuc.edu">John Criswell</a>,
				65	<a href="mailto:sabre@nondot.org">Chris Lattner</a>,
				66	<a href="http://misha.brukman.net">Misha Brukman</a>,
				67	<a href="http://www.cs.uiuc.edu/~vadve">Vikram Adve</a>, and
				68	<a href="mailto:gshi1@uiuc.edu">Guochun Shi</a>.
				69	</p>
				70	</div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	71
				72
				73	<!-- *********************************************************************** -->
				74	<div class="doc_section">
				75	<a name="overview"><b>Overview</b></a>
				76	</div>
				77	<!-- *********************************************************************** -->
				78
				79	<div class="doc_text">
				80
				81	<p>Welcome to LLVM! In order to get started, you first need to know some
				82	basic information.</p>
				83
				84	<p>First, LLVM comes in two pieces. The first piece is the LLVM suite. This
				85	contains all of the tools, libraries, and header files needed to use the low
				86	level virtual machine. It contains an assembler, disassembler, bytecode
Reid Spencer	80f843d	2006-08-28 00:34:19 +0000	[diff] [blame]	87	analyzer and bytecode optimizer. It also contains a test suite that can be
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	88	used to test the LLVM tools and the GCC front end.</p>
				89
				90	<p>The second piece is the GCC front end. This component provides a version of
				91	GCC that compiles C and C++ code into LLVM bytecode. Currently, the GCC front
Chris Lattner	40872ad	2007-03-06 06:27:34 +0000	[diff] [blame^]	92	end uses the GCC parser to convert code to LLVM. Once
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	93	compiled into LLVM bytecode, a program can be manipulated with the LLVM tools
				94	from the LLVM suite.</p>
				95
John Criswell	6ab273c	2004-12-08 17:53:54 +0000	[diff] [blame]	96	<p>
				97	There is a third, optional piece called llvm-test. It is a suite of programs
				98	with a testing harness that can be used to further test LLVM's functionality
				99	and performance.
				100	</p>
				101
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	102	</div>
				103
				104	<!-- *********************************************************************** -->
				105	<div class="doc_section">
				106	<a name="quickstart"><b>Getting Started Quickly (A Summary)</b></a>
				107	</div>
				108	<!-- *********************************************************************** -->
				109
				110	<div class="doc_text">
				111
				112	<p>Here's the short story for getting up and running quickly with LLVM:</p>
				113
				114	<ol>
Reid Spencer	3fbf26a	2004-11-08 00:29:22 +0000	[diff] [blame]	115	<li>Read the documentation.</li>
				116	<li>Read the documentation.</li>
				117	<li>Remember that you were warned twice about reading the documentation.</li>
Misha Brukman	20b8a656	2005-02-03 22:25:23 +0000	[diff] [blame]	118	<li>Install the GCC front end if you intend to compile C or C++:
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	119	<ol>
Reid Spencer	788b0fd	2004-12-22 06:29:07 +0000	[diff] [blame]	120	<li><tt>cd <i>where-you-want-the-C-front-end-to-live</i></tt></li>
Tanya Lattner	da2d1e2	2006-11-20 06:04:46 +0000	[diff] [blame]	121	<li><tt>gunzip --stdout llvm-gcc.<i>platform</i>.tar.gz \| tar -xvf -</tt>
Reid Spencer	788b0fd	2004-12-22 06:29:07 +0000	[diff] [blame]	122	</li>
Tanya Lattner	da2d1e2	2006-11-20 06:04:46 +0000	[diff] [blame]	123	<li><tt>cd llvm-gcc3.4/<i>platform</i> (llvm-gcc3.4 only)<br>
Reid Spencer	788b0fd	2004-12-22 06:29:07 +0000	[diff] [blame]	124	./fixheaders</tt></li>
Tanya Lattner	da2d1e2	2006-11-20 06:04:46 +0000	[diff] [blame]	125	<li>Add llvm-gcc's "bin" directory to your PATH variable.</li>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	126	</ol></li>
				127
Misha Brukman	20b8a656	2005-02-03 22:25:23 +0000	[diff] [blame]	128	<li>Get the LLVM Source Code
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	129	<ul>
Misha Brukman	20b8a656	2005-02-03 22:25:23 +0000	[diff] [blame]	130	<li>With the distributed files (or use <a href="#checkout">CVS</a>):
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	131	<ol>
				132	<li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
John Criswell	64f13ab	2004-03-12 20:31:37 +0000	[diff] [blame]	133	<li><tt>gunzip --stdout llvm-<i>version</i>.tar.gz \| tar -xvf -</tt>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	134	</ol></li>
				135
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	136	</ul></li>
				137
Misha Brukman	20b8a656	2005-02-03 22:25:23 +0000	[diff] [blame]	138	<li><b>[Optional]</b> Get the Test Suite Source Code
John Criswell	dfe6a86	2004-12-10 15:51:16 +0000	[diff] [blame]	139	<ul>
Misha Brukman	20b8a656	2005-02-03 22:25:23 +0000	[diff] [blame]	140	<li>With the distributed files (or use <a href="#checkout">CVS</a>):
John Criswell	dfe6a86	2004-12-10 15:51:16 +0000	[diff] [blame]	141	<ol>
				142	<li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
				143	<li><tt>cd llvm/projects</tt>
				144	<li><tt>gunzip --stdout llvm-test-<i>version</i>.tar.gz \| tar -xvf -</tt>
John Criswell	dfe6a86	2004-12-10 15:51:16 +0000	[diff] [blame]	145	</ol></li>
				146
John Criswell	dfe6a86	2004-12-10 15:51:16 +0000	[diff] [blame]	147	</ul></li>
				148
				149
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	150	<li>Configure the LLVM Build Environment
				151	<ol>
Misha Brukman	20b8a656	2005-02-03 22:25:23 +0000	[diff] [blame]	152	<li><tt>cd <i>where-you-want-to-build-llvm</i></tt></li>
				153	<li><tt><i>/path/to/llvm/</i>configure [options]</tt><br>
				154	Some common options:
				155
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	156	<ul>
Reid Spencer	788b0fd	2004-12-22 06:29:07 +0000	[diff] [blame]	157	<li><tt>--prefix=<i>directory</i></tt>
				158	<p>Specify for <i>directory</i> the full pathname of where you
Misha Brukman	20b8a656	2005-02-03 22:25:23 +0000	[diff] [blame]	159	want the LLVM tools and libraries to be installed (default
				160	<tt>/usr/local</tt>).</p></li>
Reid Spencer	6bfa7a4	2004-12-26 05:47:26 +0000	[diff] [blame]	161	<li><tt>--with-llvmgccdir=<i>directory</i></tt>
				162	<p>Optionally, specify for <i>directory</i> the full pathname of the
John Criswell	cfdeb5c	2005-05-09 16:39:27 +0000	[diff] [blame]	163	C/C++ front end installation to use with this LLVM configuration. If
Reid Spencer	6bfa7a4	2004-12-26 05:47:26 +0000	[diff] [blame]	164	not specified, the PATH will be searched.</p></li>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	165	<li><tt>--enable-spec2000=<i>directory</i></tt>
				166	<p>Enable the SPEC2000 benchmarks for testing. The SPEC2000
				167	benchmarks should be available in
				168	<tt><i>directory</i></tt>.</p></li>
				169	</ul>
				170	</ol></li>
				171
				172	<li>Build the LLVM Suite:
				173	<ol>
Chris Lattner	e0050f0	2004-07-18 22:32:22 +0000	[diff] [blame]	174	<li><tt>gmake -k \|& tee gnumake.out
				175	# this is csh or tcsh syntax</tt></li>
Chris Lattner	13ce918	2007-01-04 07:06:05 +0000	[diff] [blame]	176	<li>If you get an "internal compiler error (ICE)" or test failures, see
				177	<a href="#brokengcc">below</a>.</li>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	178	</ol>
				179
				180	</ol>
				181
Chris Lattner	53e5e2a	2004-06-21 22:52:48 +0000	[diff] [blame]	182	<p>Consult the <a href="#starting">Getting Started with LLVM</a> section for
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	183	detailed information on configuring and compiling LLVM. See <a
				184	href="#environment">Setting Up Your Environment</a> for tips that simplify
				185	working with the GCC front end and LLVM tools. Go to <a href="#layout">Program
				186	Layout</a> to learn about the layout of the source code tree.</p>
				187
				188	</div>
				189
				190	<!-- *********************************************************************** -->
				191	<div class="doc_section">
				192	<a name="requirements"><b>Requirements</b></a>
				193	</div>
				194	<!-- *********************************************************************** -->
				195
				196	<div class="doc_text">
				197
				198	<p>Before you begin to use the LLVM system, review the requirements given below.
				199	This may save you some trouble by knowing ahead of time what hardware and
				200	software you will need.</p>
				201
				202	</div>
				203
				204	<!-- ======================================================================= -->
				205	<div class="doc_subsection">
				206	<a name="hardware"><b>Hardware</b></a>
				207	</div>
				208
				209	<div class="doc_text">
				210
				211	<p>LLVM is known to work on the following platforms:</p>
				212
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	213	<table cellpadding="3" summary="Known LLVM platforms">
Misha Brukman	b068167	2004-11-15 05:19:53 +0000	[diff] [blame]	214	<tr>
				215	<th>OS</th>
				216	<th>Arch</th>
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	217	<th>Compilers</th>
Misha Brukman	b068167	2004-11-15 05:19:53 +0000	[diff] [blame]	218	</tr>
				219	<tr>
				220	<td>Linux</td>
Chris Lattner	ac648f5	2005-02-09 21:15:51 +0000	[diff] [blame]	221	<td>x86<sup><a href="#pf_1">1</a></sup></td>
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	222	<td>GCC</td>
Misha Brukman	b068167	2004-11-15 05:19:53 +0000	[diff] [blame]	223	</tr>
				224	<tr>
				225	<td>Solaris</td>
				226	<td>V9 (Ultrasparc)</td>
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	227	<td>GCC</td>
Misha Brukman	b068167	2004-11-15 05:19:53 +0000	[diff] [blame]	228	</tr>
				229	<tr>
				230	<td>FreeBSD</td>
Chris Lattner	ac648f5	2005-02-09 21:15:51 +0000	[diff] [blame]	231	<td>x86<sup><a href="#pf_1">1</a></sup></td>
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	232	<td>GCC</td>
Misha Brukman	b068167	2004-11-15 05:19:53 +0000	[diff] [blame]	233	</tr>
				234	<tr>
Chris Lattner	ac648f5	2005-02-09 21:15:51 +0000	[diff] [blame]	235	<td>MacOS X<sup><a href="#pf_2">2</a></sup></td>
Misha Brukman	b068167	2004-11-15 05:19:53 +0000	[diff] [blame]	236	<td>PowerPC</td>
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	237	<td>GCC</td>
Misha Brukman	b068167	2004-11-15 05:19:53 +0000	[diff] [blame]	238	</tr>
				239	<tr>
Tanya Lattner	fb76291	2006-04-20 04:35:34 +0000	[diff] [blame]	240	<td>MacOS X<sup><a href="#pf_2">2</a></sup></td>
				241	<td>x86</td>
				242	<td>GCC</td>
				243
				244	</tr>
				245	<tr>
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	246	<td>Cygwin/Win32</td>
Chris Lattner	9a96426	2006-07-21 00:06:27 +0000	[diff] [blame]	247	<td>x86<sup><a href="#pf_1">1</a>,<a href="#pf_8">8</a></sup></td>
Reid Spencer	a8acd82	2004-12-23 19:39:54 +0000	[diff] [blame]	248	<td>GCC 3.4.X, binutils 2.15</td>
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	249	</tr>
Misha Brukman	5ac308f	2004-12-23 07:14:56 +0000	[diff] [blame]	250	<tr>
Chris Lattner	093ffb0	2005-02-09 20:43:48 +0000	[diff] [blame]	251	<td>MinGW/Win32</td>
Chris Lattner	9a96426	2006-07-21 00:06:27 +0000	[diff] [blame]	252	<td>x86<sup><a href="#pf_1">1</a>,<a href="#pf_6">6</a>,<a href="#pf_8">8</a></sup></td>
Chris Lattner	093ffb0	2005-02-09 20:43:48 +0000	[diff] [blame]	253	<td>GCC 3.4.X, binutils 2.15</td>
				254	</tr>
				255	<tr>
Misha Brukman	5ac308f	2004-12-23 07:14:56 +0000	[diff] [blame]	256	<td>Linux</td>
Chris Lattner	ac648f5	2005-02-09 21:15:51 +0000	[diff] [blame]	257	<td>amd64<sup><a href="#pf_3">3</a></sup></td>
Misha Brukman	5ac308f	2004-12-23 07:14:56 +0000	[diff] [blame]	258	<td>GCC</td>
				259	</tr>
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	260	</table>
				261
				262	<p>LLVM has partial support for the following platforms:</p>
				263
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	264	<table summary="LLVM partial platform support">
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	265	<tr>
				266	<th>OS</th>
				267	<th>Arch</th>
				268	<th>Compilers</th>
Misha Brukman	b068167	2004-11-15 05:19:53 +0000	[diff] [blame]	269	</tr>
Misha Brukman	dca7238	2004-11-15 21:05:08 +0000	[diff] [blame]	270	<tr>
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	271	<td>Windows</td>
Chris Lattner	ac648f5	2005-02-09 21:15:51 +0000	[diff] [blame]	272	<td>x86<sup><a href="#pf_1">1</a></sup></td>
				273	<td>Visual Studio .NET<sup><a href="#pf_4">4</a>,<a href="#pf_5">5</a></sup></td>
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	274	<tr>
Chris Lattner	ac648f5	2005-02-09 21:15:51 +0000	[diff] [blame]	275	<td>AIX<sup><a href="#pf_3">3</a>,<a href="#pf_4">4</a></sup></td>
Misha Brukman	dca7238	2004-11-15 21:05:08 +0000	[diff] [blame]	276	<td>PowerPC</td>
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	277	<td>GCC</td>
				278	</tr>
				279	<tr>
Chris Lattner	ac648f5	2005-02-09 21:15:51 +0000	[diff] [blame]	280	<td>Linux<sup><a href="#pf_3">3</a>,<a href="#pf_5">5</a></sup></td>
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	281	<td>PowerPC</td>
				282	<td>GCC</td>
Misha Brukman	dca7238	2004-11-15 21:05:08 +0000	[diff] [blame]	283	</tr>
John Criswell	05990f3	2005-05-09 16:49:59 +0000	[diff] [blame]	284
				285	<tr>
				286	<td>Linux<sup><a href="#pf_7">7</a></sup></td>
				287	<td>Alpha</td>
				288	<td>GCC</td>
				289	</tr>
				290	<tr>
				291	<td>Linux<sup><a href="#pf_7">7</a></sup></td>
				292	<td>Itanium (IA-64)</td>
				293	<td>GCC</td>
				294	</tr>
Duraid Madina	332b16a	2005-05-10 06:57:53 +0000	[diff] [blame]	295	<tr>
				296	<td>HP-UX<sup><a href="#pf_7">7</a></sup></td>
				297	<td>Itanium (IA-64)</td>
				298	<td>HP aCC</td>
				299	</tr>
Misha Brukman	b068167	2004-11-15 05:19:53 +0000	[diff] [blame]	300	</table>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	301
Misha Brukman	7772309	2005-02-09 21:01:26 +0000	[diff] [blame]	302	<p><b>Notes:</b></p>
				303
Misha Brukman	0c4b8b6	2005-02-09 22:38:47 +0000	[diff] [blame]	304	<div class="doc_notes">
				305	<ol>
				306	<li><a name="pf_1">Code generation supported for Pentium processors and
				307	up</a></li>
				308	<li><a name="pf_2">Code generation supported for 32-bit ABI only</a></li>
				309	<li><a name="pf_3">No native code generation</a></li>
				310	<li><a name="pf_4">Build is not complete: one or more tools don't link</a></li>
				311	<li><a name="pf_5">The GCC-based C/C++ frontend does not build</a></li>
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	312	<li><a name="pf_6">The port is done using the MSYS shell.</a>
Misha Brukman	7772309	2005-02-09 21:01:26 +0000	[diff] [blame]	313	<a href="http://www.mingw.org/MinGWiki/">Download</a> and install
Chris Lattner	9a96426	2006-07-21 00:06:27 +0000	[diff] [blame]	314	bison (excl. M4.exe) and flex in that order. Build binutils-2.15 from source,
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	315	if necessary. Bison & flex can be also grabbed from GNUWin32 sf.net
				316	project.</li>
John Criswell	05990f3	2005-05-09 16:49:59 +0000	[diff] [blame]	317	<li><a name="pf_7">Native code generation exists but is not complete.</a></li>
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	318	<li><a name="pf_8">Binutils</a> up to post-2.17 has bug in bfd/cofflink.c
Chris Lattner	9a96426	2006-07-21 00:06:27 +0000	[diff] [blame]	319	preventing LLVM from building correctly. Several workarounds have been
				320	introduced into LLVM build system, but the bug can occur anytime in the
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	321	future. We highly recommend that you rebuild your current binutils with the
Chris Lattner	9a96426	2006-07-21 00:06:27 +0000	[diff] [blame]	322	patch from <a href="http://sourceware.org/bugzilla/show_bug.cgi?id=2659">
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	323	Binutils bugzilla</a>, if it wasn't already applied.</li>
Misha Brukman	7772309	2005-02-09 21:01:26 +0000	[diff] [blame]	324	</ol>
Misha Brukman	7772309	2005-02-09 21:01:26 +0000	[diff] [blame]	325	</div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	326
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	327	<p>Note that you will need about 1-3 GB of space for a full LLVM build in Debug
John Criswell	e1a8120	2005-05-18 19:43:33 +0000	[diff] [blame]	328	mode, depending on the system (it is so large because of all the debugging
				329	information and the fact that the libraries are statically linked into multiple
				330	tools). If you do not need many of the tools and you are space-conscious,
Misha Brukman	1ed0fa5	2004-11-19 21:53:22 +0000	[diff] [blame]	331	you can disable them individually in <tt>llvm/tools/Makefile</tt>. The Release
				332	build requires considerably less space.</p>
				333
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	334	<p>The LLVM suite <i>may</i> compile on other platforms, but it is not
				335	guaranteed to do so. If compilation is successful, the LLVM utilities should be
				336	able to assemble, disassemble, analyze, and optimize LLVM bytecode. Code
				337	generation should work as well, although the generated native code may not work
				338	on your platform.</p>
				339
				340	<p>The GCC front end is not very portable at the moment. If you want to get it
Misha Brukman	876d5f1	2004-08-09 19:57:01 +0000	[diff] [blame]	341	to work on another platform, you can download a copy of the source and <a
				342	href="CFEBuildInstrs.html">try to compile it</a> on your platform.</p>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	343
				344	</div>
				345
				346	<!-- ======================================================================= -->
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	347	<div class="doc_subsection"><a name="software"><b>Software</b></a></div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	348	<div class="doc_text">
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	349	<p>Compiling LLVM requires that you have several software packages
				350	installed. The table below lists those required packages. The Package column
				351	is the usual name for the software package that LLVM depends on. The Version
				352	column provides "known to work" versions of the package. The Notes column
				353	describes how LLVM uses the package and provides other details.</p>
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	354	<table summary="Packages required to compile LLVM">
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	355	<tr><th>Package</th><th>Version</th><th>Notes</th></tr>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	356
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	357	<tr>
				358	<td><a href="http://savannah.gnu.org/projects/make">GNU Make</a></td>
				359	<td>3.79, 3.79.1</td>
				360	<td>Makefile/build processor</td>
				361	</tr>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	362
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	363	<tr>
				364	<td><a href="http://gcc.gnu.org">GCC</a></td>
				365	<td>3.4.2</td>
Misha Brukman	0c4b8b6	2005-02-09 22:38:47 +0000	[diff] [blame]	366	<td>C/C++ compiler<sup><a href="#sf1">1</a></sup></td>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	367	</tr>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	368
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	369	<tr>
Chris Lattner	f1705fd	2005-09-06 04:07:15 +0000	[diff] [blame]	370	<td><a href="http://www.gnu.org/software/texinfo">TeXinfo</a></td>
				371	<td>4.5</td>
				372	<td>For building the CFE</td>
				373	</tr>
				374
				375	<tr>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	376	<td><a href="http://www.gnu.org/software/flex">Flex</a></td>
				377	<td>2.5.4</td>
				378	<td>LEX compiler</td>
				379	</tr>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	380
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	381	<tr>
				382	<td><a href="http://www.gnu.org/software/bison/bison.html">Bison</a></td>
Jeff Cohen	7120107	2006-01-04 06:51:22 +0000	[diff] [blame]	383	<td>1.28, 1.35, 1.75, 1.875d, 2.0, or 2.1<br>(not 1.85 or 1.875)</td>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	384	<td>YACC compiler</td>
				385	</tr>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	386
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	387	<tr>
Misha Brukman	0c4b8b6	2005-02-09 22:38:47 +0000	[diff] [blame]	388	<td><a href="https://www.cvshome.org/downloads.html">CVS</a></td>
				389	<td>≥1.11</td>
				390	<td>CVS access to LLVM<sup><a href="#sf2">2</a></sup></td>
				391	</tr>
				392
				393	<tr>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	394	<td><a href="http://savannah.gnu.org/projects/dejagnu">DejaGnu</a></td>
				395	<td>1.4.2</td>
Misha Brukman	0c4b8b6	2005-02-09 22:38:47 +0000	[diff] [blame]	396	<td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	397	</tr>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	398
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	399	<tr>
				400	<td><a href="http://www.tcl.tk/software/tcltk/">tcl</a></td>
				401	<td>8.3, 8.4</td>
Misha Brukman	0c4b8b6	2005-02-09 22:38:47 +0000	[diff] [blame]	402	<td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	403	</tr>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	404
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	405	<tr>
				406	<td><a href="http://expect.nist.gov/">expect</a></td>
				407	<td>5.38.0</td>
Misha Brukman	0c4b8b6	2005-02-09 22:38:47 +0000	[diff] [blame]	408	<td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	409	</tr>
				410
				411	<tr>
				412	<td><a href="http://www.perl.com/download.csp">perl</a></td>
Reid Spencer	098fce4	2004-12-09 17:55:37 +0000	[diff] [blame]	413	<td>≥5.6.0</td>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	414	<td>Nightly tester, utilities</td>
				415	</tr>
				416
				417	<tr>
Misha Brukman	0c4b8b6	2005-02-09 22:38:47 +0000	[diff] [blame]	418	<td><a href="http://savannah.gnu.org/projects/m4">GNU M4</a>
				419	<td>1.4</td>
				420	<td>Macro processor for configuration<sup><a href="#sf4">4</a></sup></td>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	421	</tr>
				422
				423	<tr>
Misha Brukman	0c4b8b6	2005-02-09 22:38:47 +0000	[diff] [blame]	424	<td><a href="http://www.gnu.org/software/autoconf">GNU Autoconf</a></td>
				425	<td>2.59</td>
				426	<td>Configuration script builder<sup><a href="#sf4">4</a></sup></td>
				427	</tr>
				428
				429	<tr>
				430	<td><a href="http://www.gnu.org/software/automake">GNU Automake</a></td>
				431	<td>1.9.2</td>
				432	<td>aclocal macro generator<sup><a href="#sf4">4</a></sup></td>
				433	</tr>
				434
				435	<tr>
				436	<td><a href="http://savannah.gnu.org/projects/libtool">libtool</a></td>
				437	<td>1.5.10</td>
				438	<td>Shared library manager<sup><a href="#sf4">4</a></sup></td>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	439	</tr>
				440
				441	</table>
				442
Misha Brukman	0c4b8b6	2005-02-09 22:38:47 +0000	[diff] [blame]	443	<p><b>Notes:</b></p>
				444	<div class="doc_notes">
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	445	<ol>
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	446	<li><a name="sf1">Only the C and C++ languages are needed so there's no
Misha Brukman	0c4b8b6	2005-02-09 22:38:47 +0000	[diff] [blame]	447	need to build the other languages for LLVM's purposes.</a> See
				448	<a href="#brokengcc">below</a> for specific version info.</li>
				449	<li><a name="sf2">You only need CVS if you intend to build from the
				450	latest LLVM sources. If you're working from a release distribution, you
				451	don't need CVS.</a></li>
				452	<li><a name="sf3">Only needed if you want to run the automated test
				453	suite in the <tt>llvm/test</tt> directory.</a></li>
				454	<li><a name="sf4">If you want to make changes to the configure scripts,
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	455	you will need GNU autoconf (2.59), and consequently, GNU M4 (version 1.4
Reid Spencer	098fce4	2004-12-09 17:55:37 +0000	[diff] [blame]	456	or higher). You will also need automake (1.9.2). We only use aclocal
				457	from that package.</a></li>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	458	</ol>
Misha Brukman	0c4b8b6	2005-02-09 22:38:47 +0000	[diff] [blame]	459	</div>
				460
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	461	<p>Additionally, your compilation host is expected to have the usual
				462	plethora of Unix utilities. Specifically:</p>
				463	<ul>
				464	<li><b>ar</b> - archive library builder</li>
				465	<li><b>bzip2*</b> - bzip2 command for distribution generation</li>
				466	<li><b>bunzip2*</b> - bunzip2 command for distribution checking</li>
				467	<li><b>chmod</b> - change permissions on a file</li>
John Criswell	33e0f06	2004-12-08 16:55:27 +0000	[diff] [blame]	468	<li><b>cat</b> - output concatenation utility</li>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	469	<li><b>cp</b> - copy files</li>
				470	<li><b>date</b> - print the current date/time </li>
				471	<li><b>echo</b> - print to standard output</li>
				472	<li><b>egrep</b> - extended regular expression search utility</li>
				473	<li><b>etags</b> - C/C++ tag file creator for vim/emacs</li>
				474	<li><b>find</b> - find files/dirs in a file system</li>
				475	<li><b>grep</b> - regular expression search utility</li>
				476	<li><b>gzip*</b> - gzip command for distribution generation</li>
				477	<li><b>gunzip*</b> - gunzip command for distribution checking</li>
				478	<li><b>install</b> - install directories/files </li>
				479	<li><b>mkdir</b> - create a directory</li>
				480	<li><b>mv</b> - move (rename) files</li>
				481	<li><b>ranlib</b> - symbol table builder for archive libraries</li>
Misha Brukman	29d3d46	2004-11-20 01:27:40 +0000	[diff] [blame]	482	<li><b>rm</b> - remove (delete) files and directories</li>
Reid Spencer	38fcf30	2004-11-15 21:15:12 +0000	[diff] [blame]	483	<li><b>sed</b> - stream editor for transforming output</li>
				484	<li><b>sh</b> - Bourne shell for make build scripts</li>
				485	<li><b>tar</b> - tape archive for distribution generation</li>
				486	<li><b>test</b> - test things in file system</li>
				487	<li><b>unzip*</b> - unzip command for distribution checking</li>
				488	<li><b>zip*</b> - zip command for distribution generation</li>
				489	</ul>
Chris Lattner	e0050f0	2004-07-18 22:32:22 +0000	[diff] [blame]	490	</div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	491
Chris Lattner	e0050f0	2004-07-18 22:32:22 +0000	[diff] [blame]	492	<!-- ======================================================================= -->
				493	<div class="doc_subsection">
				494	<a name="brokengcc">Broken versions of GCC</a>
				495	</div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	496
Chris Lattner	e0050f0	2004-07-18 22:32:22 +0000	[diff] [blame]	497	<div class="doc_text">
				498
				499	<p>LLVM is very demanding of the host C++ compiler, and as such tends to expose
				500	bugs in the compiler. In particular, several versions of GCC crash when trying
Chris Lattner	29052c8	2006-06-16 17:20:33 +0000	[diff] [blame]	501	to compile LLVM. We routinely use GCC 3.3.3, 3.4.0, and Apple 4.0.1
				502	successfully with them (however, see below). Other versions of GCC will
				503	probably work as well. GCC versions listed
Chris Lattner	e0050f0	2004-07-18 22:32:22 +0000	[diff] [blame]	504	here are known to not work. If you are using one of these versions, please try
				505	to upgrade your GCC to something more recent. If you run into a problem with a
				506	version of GCC not listed here, please <a href="mailto:llvmdev@cs.uiuc.edu">let
				507	us know</a>. Please use the "<tt>gcc -v</tt>" command to find out which version
				508	of GCC you are using.
				509	</p>
				510
				511	<p><b>GCC versions prior to 3.0</b>: GCC 2.96.x and before had several
				512	problems in the STL that effectively prevent it from compiling LLVM.
				513	</p>
				514
John Criswell	fd76945	2004-11-23 22:06:24 +0000	[diff] [blame]	515	<p><b>GCC 3.2.2</b>: This version of GCC fails to compile LLVM.</p>
				516
Chris Lattner	e0050f0	2004-07-18 22:32:22 +0000	[diff] [blame]	517	<p><b>GCC 3.3.2</b>: This version of GCC suffered from a <a
				518	href="http://gcc.gnu.org/PR13392">serious bug</a> which causes it to crash in
				519	the "<tt>convert_from_eh_region_ranges_1</tt>" GCC function.</p>
Chris Lattner	e254e2f	2005-02-12 20:11:13 +0000	[diff] [blame]	520
Chris Lattner	5824762	2005-02-13 22:20:49 +0000	[diff] [blame]	521	<p><b>Cygwin GCC 3.3.3</b>: The version of GCC 3.3.3 commonly shipped with
				522	Cygwin does not work. Please <a href="CFEBuildInstrs.html#cygwin">upgrade
				523	to a newer version</a> if possible.</p>
				524	<p><b>SuSE GCC 3.3.3</b>: The version of GCC 3.3.3 shipped with SuSE 9.1 (and
				525	possibly others) does not compile LLVM correctly (it appears that exception
				526	handling is broken in some cases). Please download the FSF 3.3.3 or upgrade
				527	to a newer version of GCC.</p>
Chris Lattner	7caf6f6	2005-05-15 22:26:45 +0000	[diff] [blame]	528	<p><b>IA-64 GCC 4.0.0</b>: The IA-64 version of GCC 4.0.0 is known to
				529	miscompile LLVM.</p>
Chris Lattner	c9ede19	2006-06-16 19:53:39 +0000	[diff] [blame]	530	<p><b>Apple Xcode 2.3</b>: GCC crashes when compiling LLVM at -O3 (which is the
				531	default with ENABLE_OPTIMIZED=1. To work around this, build with
				532	"ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O2".</p>
Chris Lattner	aa64b94	2006-09-07 17:34:27 +0000	[diff] [blame]	533	<p><b>GCC 4.1.1</b>: GCC fails to build LLVM with template concept check errors
				534	compiling some files. At the time of this writing, GCC mainline (4.2)
				535	did not share the problem.</p>
Chris Lattner	13ce918	2007-01-04 07:06:05 +0000	[diff] [blame]	536	<p><b>GCC 4.1.1 on X86-64/amd64</b>: GCC <a href="http://llvm.org/PR1063">
				537	miscompiles portions of LLVM</a> when compiling llvm itself into 64-bit
				538	code. LLVM will appear to mostly work but will be buggy, e.g. failing
				539	portions of its testsuite.</p>
Reid Spencer	6291ddc	2006-11-04 00:33:42 +0000	[diff] [blame]	540	<p><b>GNU ld 2.16.X</b>. Some 2.16.X versions of the ld linker will produce very
				541	long warning messages complaining that some ".gnu.linkonce.t.*" symbol was
				542	defined in a discarded section. You can safely ignore these messages as they are
				543	erroneous and the linkage is correct. These messages disappear using ld
				544	2.17.</p>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	545	</div>
				546
Chris Lattner	e0050f0	2004-07-18 22:32:22 +0000	[diff] [blame]	547
				548
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	549	<!-- *********************************************************************** -->
				550	<div class="doc_section">
				551	<a name="starting"><b>Getting Started with LLVM</b></a>
				552	</div>
				553	<!-- *********************************************************************** -->
				554
Chris Lattner	e0050f0	2004-07-18 22:32:22 +0000	[diff] [blame]	555	<div class="doc_text">
				556
				557	<p>The remainder of this guide is meant to get you up and running with
				558	LLVM and to give you some basic information about the LLVM environment.</p>
				559
				560	<p>The later sections of this guide describe the <a
				561	href="#layout">general layout</a> of the the LLVM source tree, a <a
				562	href="#tutorial">simple example</a> using the LLVM tool chain, and <a
				563	href="#links">links</a> to find more information about LLVM or to get
				564	help via e-mail.</p>
				565	</div>
				566
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	567	<!-- ======================================================================= -->
				568	<div class="doc_subsection">
				569	<a name="terminology">Terminology and Notation</a>
				570	</div>
				571
				572	<div class="doc_text">
				573
				574	<p>Throughout this manual, the following names are used to denote paths
				575	specific to the local system and working environment. <i>These are not
				576	environment variables you need to set but just strings used in the rest
				577	of this document below</i>. In any of the examples below, simply replace
				578	each of these names with the appropriate pathname on your local system.
				579	All these paths are absolute:</p>
				580
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	581	<dl>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	582	<dt>SRC_ROOT
				583	<dd>
				584	This is the top level directory of the LLVM source tree.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	585	<br><br>
John Criswell	f531f31	2003-10-27 18:18:16 +0000	[diff] [blame]	586
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	587	<dt>OBJ_ROOT
				588	<dd>
				589	This is the top level directory of the LLVM object tree (i.e. the
				590	tree where object files and compiled programs will be placed. It
				591	can be the same as SRC_ROOT).
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	592	<br><br>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	593
				594	<dt>LLVMGCCDIR
				595	<dd>
Reid Spencer	6bfa7a4	2004-12-26 05:47:26 +0000	[diff] [blame]	596	This is where the LLVM GCC Front End is installed.
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	597	<p>
				598	For the pre-built GCC front end binaries, the LLVMGCCDIR is
Tanya Lattner	da2d1e2	2006-11-20 06:04:46 +0000	[diff] [blame]	599	<tt>llvm-gcc/<i>platform</i>/llvm-gcc</tt>.
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	600	</dl>
				601
				602	</div>
				603
				604	<!-- ======================================================================= -->
				605	<div class="doc_subsection">
				606	<a name="environment">Setting Up Your Environment</a>
				607	</div>
				608
				609	<div class="doc_text">
				610
				611	<p>
Misha Brukman	cd67325	2005-02-03 18:28:08 +0000	[diff] [blame]	612	In order to compile and use LLVM, you may need to set some environment
				613	variables.
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	614
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	615	<dl>
Reid Spencer	360d6b7	2004-12-15 00:14:01 +0000	[diff] [blame]	616	<dt><tt>LLVM_LIB_SEARCH_PATH</tt>=<tt>/path/to/your/bytecode/libs</tt></dt>
Misha Brukman	cd67325	2005-02-03 18:28:08 +0000	[diff] [blame]	617	<dd>[Optional] This environment variable helps LLVM linking tools find the
John Criswell	e1a8120	2005-05-18 19:43:33 +0000	[diff] [blame]	618	locations of your bytecode libraries. It is provided only as a
Misha Brukman	cd67325	2005-02-03 18:28:08 +0000	[diff] [blame]	619	convenience since you can specify the paths using the -L options of the
John Criswell	e1a8120	2005-05-18 19:43:33 +0000	[diff] [blame]	620	tools and the C/C++ front-end will automatically use the bytecode files
				621	installed in its
Misha Brukman	cd67325	2005-02-03 18:28:08 +0000	[diff] [blame]	622	<tt>lib</tt> directory.</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	623	</dl>
				624
				625	</div>
				626
				627	<!-- ======================================================================= -->
				628	<div class="doc_subsection">
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	629	<a name="unpack">Unpacking the LLVM Archives</a>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	630	</div>
				631
				632	<div class="doc_text">
				633
				634	<p>
				635	If you have the LLVM distribution, you will need to unpack it before you
John Criswell	86a3a48	2003-12-18 16:43:17 +0000	[diff] [blame]	636	can begin to compile it. LLVM is distributed as a set of two files: the LLVM
John Criswell	dfe6a86	2004-12-10 15:51:16 +0000	[diff] [blame]	637	suite and the LLVM GCC front end compiled for your platform. There is an
				638	additional test suite that is optional. Each file is a TAR archive that is
				639	compressed with the gzip program.
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	640	</p>
				641
Misha Brukman	d4528ea	2005-02-02 18:01:57 +0000	[diff] [blame]	642	<p>The files are as follows, with <em>x.y</em> marking the version number:
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	643	<dl>
Misha Brukman	d4528ea	2005-02-02 18:01:57 +0000	[diff] [blame]	644	<dt><tt>llvm-x.y.tar.gz</tt></dt>
				645	<dd>Source release for the LLVM libraries and tools.<br/></dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	646
Misha Brukman	d4528ea	2005-02-02 18:01:57 +0000	[diff] [blame]	647	<dt><tt>llvm-test-x.y.tar.gz</tt></dt>
Chris Lattner	ac648f5	2005-02-09 21:15:51 +0000	[diff] [blame]	648	<dd>Source release for the LLVM test suite.</dd>
Misha Brukman	c318444	2004-11-23 19:26:24 +0000	[diff] [blame]	649
Chris Lattner	499abb5	2006-04-20 05:08:23 +0000	[diff] [blame]	650	<dt><tt>llvm-gcc4-x.y.source.tar.gz</tt></dt>
				651	<dd>Source release of the llvm-gcc4 front end. See README.LLVM in the root
				652	directory for build instructions.<br/></dd>
				653
Tanya Lattner	da2d1e2	2006-11-20 06:04:46 +0000	[diff] [blame]	654	<dt><tt>llvm-gcc4-x.y-platform.tar.gz</tt></dt>
				655	<dd>Binary release of the llvm-gcc4 front end for a specific platform.<br/></dd>
Chris Lattner	499abb5	2006-04-20 05:08:23 +0000	[diff] [blame]	656
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	657	</dl>
				658
Jim Laskey	b4c0347	2006-07-31 21:37:55 +0000	[diff] [blame]	659	<p>It is also possible to download the sources of the llvm-gcc4 front end from a
				660	read-only subversion mirror at
				661	svn://anonsvn.opensource.apple.com/svn/llvm/trunk. </p>
Jim Laskey	34ea26a	2006-06-16 23:20:21 +0000	[diff] [blame]	662
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	663	</div>
				664
				665	<!-- ======================================================================= -->
				666	<div class="doc_subsection">
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	667	<a name="checkout">Checkout LLVM from CVS</a>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	668	</div>
				669
				670	<div class="doc_text">
				671
				672	<p>If you have access to our CVS repository, you can get a fresh copy of
				673	the entire source code. All you need to do is check it out from CVS as
				674	follows:</p>
				675
				676	<ul>
				677	<li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
Chris Lattner	c477427	2006-08-03 22:14:43 +0000	[diff] [blame]	678	<li><tt>cvs -d :pserver:anon@llvm.org:/var/cvs/llvm login</tt>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	679	<li>Hit the return key when prompted for the password.
Chris Lattner	c477427	2006-08-03 22:14:43 +0000	[diff] [blame]	680	<li><tt>cvs -z3 -d :pserver:anon@llvm.org:/var/cvs/llvm co
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	681	llvm</tt>
				682	</ul>
				683
				684	<p>This will create an '<tt>llvm</tt>' directory in the current
				685	directory and fully populate it with the LLVM source code, Makefiles,
				686	test directories, and local copies of documentation files.</p>
				687
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	688	<p>If you want to get a specific release (as opposed to the most recent
				689	revision), you can specify a label. The following releases have the following
Misha Brukman	d4528ea	2005-02-02 18:01:57 +0000	[diff] [blame]	690	labels:</p>
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	691
John Criswell	86a3a48	2003-12-18 16:43:17 +0000	[diff] [blame]	692	<ul>
Tanya Lattner	84252ca	2006-11-20 06:07:10 +0000	[diff] [blame]	693	<li>Release 1.9: <b>RELEASE_19</b></li>
Tanya Lattner	da2d1e2	2006-11-20 06:04:46 +0000	[diff] [blame]	694	<li>Release 1.8: <b>RELEASE_18</b></li>
Tanya Lattner	fb76291	2006-04-20 04:35:34 +0000	[diff] [blame]	695	<li>Release 1.7: <b>RELEASE_17</b></li>
John Criswell	3bdbd30	2005-11-08 21:11:33 +0000	[diff] [blame]	696	<li>Release 1.6: <b>RELEASE_16</b></li>
John Criswell	05990f3	2005-05-09 16:49:59 +0000	[diff] [blame]	697	<li>Release 1.5: <b>RELEASE_15</b></li>
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	698	<li>Release 1.4: <b>RELEASE_14</b></li>
John Criswell	1e87b97	2004-08-16 14:51:33 +0000	[diff] [blame]	699	<li>Release 1.3: <b>RELEASE_13</b></li>
Misha Brukman	c1aac03	2004-05-12 19:25:59 +0000	[diff] [blame]	700	<li>Release 1.2: <b>RELEASE_12</b></li>
				701	<li>Release 1.1: <b>RELEASE_11</b></li>
				702	<li>Release 1.0: <b>RELEASE_1</b></li>
John Criswell	86a3a48	2003-12-18 16:43:17 +0000	[diff] [blame]	703	</ul>
John Criswell	86a3a48	2003-12-18 16:43:17 +0000	[diff] [blame]	704
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	705	<p>If you would like to get the LLVM test suite (a separate package as of 1.4),
				706	you get it from the CVS repository:</p>
				707	<pre>
				708	cd llvm/projects
Chris Lattner	c477427	2006-08-03 22:14:43 +0000	[diff] [blame]	709	cvs -z3 -d :pserver:anon@llvm.org:/var/cvs/llvm co llvm-test
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	710	</pre>
				711	<p>By placing it in the <tt>llvm/projects</tt>, it will be automatically
John Criswell	33e0f06	2004-12-08 16:55:27 +0000	[diff] [blame]	712	configured by the LLVM configure script as well as automatically updated when
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	713	you run <tt>cvs update</tt>.</p>
				714
Chris Lattner	40872ad	2007-03-06 06:27:34 +0000	[diff] [blame^]	715	<p>If you would like to get the GCC front end source code, you can also get it
				716	and build it yourself. Please follow <a href="CFEBuildInstrs.html">these
				717	instructions</a> to successfully get and build the LLVM GCC front-end.</p>
Chris Lattner	3337c82	2004-06-28 17:14:01 +0000	[diff] [blame]	718
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	719	</div>
				720
				721	<!-- ======================================================================= -->
				722	<div class="doc_subsection">
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	723	<a name="installcf">Install the GCC Front End</a>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	724	</div>
				725
				726	<div class="doc_text">
				727
Chris Lattner	24b7135	2007-02-14 07:33:00 +0000	[diff] [blame]	728	<p>Before configuring and compiling the LLVM suite, you can optionally extract the
				729	LLVM GCC front end from the binary distribution. It is used for running the
				730	llvm-test testsuite and for compiling C/C++ programs. Note that you can optionally
				731	<a href="CFEBuildInstrs.html">build llvm-gcc yourself</a> after building the
				732	main LLVM repository.</p>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	733
				734	<p>To install the GCC front end, do the following:</p>
				735
				736	<ol>
				737	<li><tt>cd <i>where-you-want-the-front-end-to-live</i></tt></li>
Tanya Lattner	da2d1e2	2006-11-20 06:04:46 +0000	[diff] [blame]	738	<li><tt>gunzip --stdout llvmgcc-<i>version</i>.<i>platform</i>.tar.gz \| tar -xvf
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	739	-</tt></li>
				740	</ol>
				741
Chris Lattner	24b7135	2007-02-14 07:33:00 +0000	[diff] [blame]	742	<p>Once the binary is uncompressed, you should add a symlink for llvm-gcc and
				743	llvm-g++ to some directory in your path. When you configure LLVM, it will
				744	automatically detect llvm-gcc's presence (if it is in your path) enabling its
				745	use in llvm-test. Note that you can always build or install llvm-gcc at any
				746	pointer after building the main LLVM repository: just reconfigure llvm and
				747	llvm-test will pick it up.
				748	</p>
				749
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	750	<p>The binary versions of the GCC front end may not suit all of your needs. For
				751	example, the binary distribution may include an old version of a system header
				752	file, not "fix" a header file that needs to be fixed for GCC, or it may be
				753	linked with libraries not available on your system.</p>
				754
				755	<p>In cases like these, you may want to try <a
				756	href="CFEBuildInstrs.html">building the GCC front end from source.</a> This is
Chris Lattner	cba6466	2007-02-14 07:34:22 +0000	[diff] [blame]	757	much easier now than it was in the past.</p>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	758
				759	</div>
				760
				761	<!-- ======================================================================= -->
				762	<div class="doc_subsection">
				763	<a name="config">Local LLVM Configuration</a>
				764	</div>
				765
				766	<div class="doc_text">
				767
				768	<p>Once checked out from the CVS repository, the LLVM suite source code must be
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	769	configured via the <tt>configure</tt> script. This script sets variables in the
				770	various <tt>*.in</tt> files, most notably <tt>llvm/Makefile.config</tt> and
				771	<tt>llvm/include/Config/config.h</tt>. It also populates <i>OBJ_ROOT</i> with
				772	the Makefiles needed to begin building LLVM.</p>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	773
				774	<p>The following environment variables are used by the <tt>configure</tt>
				775	script to configure the build system:</p>
				776
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	777	<table summary="LLVM configure script environment variables">
Reid Spencer	c3c4c4f	2004-11-01 08:19:36 +0000	[diff] [blame]	778	<tr><th>Variable</th><th>Purpose</th></tr>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	779	<tr>
				780	<td>CC</td>
				781	<td>Tells <tt>configure</tt> which C compiler to use. By default,
				782	<tt>configure</tt> will look for the first GCC C compiler in
				783	<tt>PATH</tt>. Use this variable to override
				784	<tt>configure</tt>'s default behavior.</td>
				785	</tr>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	786	<tr>
				787	<td>CXX</td>
				788	<td>Tells <tt>configure</tt> which C++ compiler to use. By default,
				789	<tt>configure</tt> will look for the first GCC C++ compiler in
				790	<tt>PATH</tt>. Use this variable to override
				791	<tt>configure</tt>'s default behavior.</td>
				792	</tr>
				793	</table>
				794
				795	<p>The following options can be used to set or enable LLVM specific options:</p>
				796
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	797	<dl>
Reid Spencer	6bfa7a4	2004-12-26 05:47:26 +0000	[diff] [blame]	798	<dt><i>--with-llvmgccdir</i></dt>
				799	<dd>Path to the LLVM C/C++ FrontEnd to be used with this LLVM configuration.
				800	The value of this option should specify the full pathname of the C/C++ Front
				801	End to be used. If this option is not provided, the PATH will be searched for
				802	a program named <i>llvm-gcc</i> and the C/C++ FrontEnd install directory will
				803	be inferred from the path found. If the option is not given, and no llvm-gcc
				804	can be found in the path then a warning will be produced by
				805	<tt>configure</tt> indicating this situation. LLVM may still be built with
				806	the <tt>tools-only</tt> target but attempting to build the runtime libraries
				807	will fail as these libraries require llvm-gcc and llvm-g++. See
				808	<a href="#installcf">Install the GCC Front End</a> for details on installing
				809	the C/C++ Front End. See
				810	<a href="CFEBuildInstrs.html">Bootstrapping the LLVM C/C++ Front-End</a>
				811	for details on building the C/C++ Front End.</dd>
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	812	<dt><i>--with-tclinclude</i></dt>
John Criswell	e1a8120	2005-05-18 19:43:33 +0000	[diff] [blame]	813	<dd>Path to the tcl include directory under which <tt>tclsh</tt> can be
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	814	found. Use this if you have multiple tcl installations on your machine and you
				815	want to use a specific one (8.x) for LLVM. LLVM only uses tcl for running the
				816	dejagnu based test suite in <tt>llvm/test</tt>. If you don't specify this
John Criswell	e1a8120	2005-05-18 19:43:33 +0000	[diff] [blame]	817	option, the LLVM configure script will search for the tcl 8.4 and 8.3
				818	releases.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	819	<br><br>
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	820	</dd>
				821	<dt><i>--enable-optimized</i></dt>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	822	<dd>
				823	Enables optimized compilation by default (debugging symbols are removed
				824	and GCC optimization flags are enabled). The default is to use an
				825	unoptimized build (also known as a debug build).
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	826	<br><br>
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	827	</dd>
Reid Spencer	294adbb	2005-12-21 03:46:45 +0000	[diff] [blame]	828	<dt><i>--enable-debug-runtime</i></dt>
				829	<dd>
				830	Enables debug symbols in the runtime libraries. The default is to strip
				831	debug symbols from the runtime libraries.
				832	</dd>
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	833	<dt><i>--enable-jit</i></dt>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	834	<dd>
John Criswell	86a3a48	2003-12-18 16:43:17 +0000	[diff] [blame]	835	Compile the Just In Time (JIT) compiler functionality. This is not
				836	available
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	837	on all platforms. The default is dependent on platform, so it is best
				838	to explicitly enable it if you want it.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	839	<br><br>
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	840	</dd>
Reid Spencer	1e195bd	2005-04-22 17:58:03 +0000	[diff] [blame]	841	<dt><i>--enable-targets=</i><tt>target-option</tt></dt>
				842	<dd>Controls which targets will be built and linked into llc. The default
				843	value for <tt>target_options</tt> is "all" which builds and links all
				844	available targets. The value "host-only" can be specified to build only a
				845	native compiler (no cross-compiler targets available). The "native" target is
				846	selected as the target of the build host. You can also specify a comma
				847	separated list of target names that you want available in llc. The target
John Criswell	e1a8120	2005-05-18 19:43:33 +0000	[diff] [blame]	848	names use all lower case. The current set of targets is: <br/>
Reid Spencer	1e195bd	2005-04-22 17:58:03 +0000	[diff] [blame]	849	<tt>alpha, ia64, powerpc, skeleton, sparc, x86</tt>.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	850	<br><br></dd>
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	851	<dt><i>--enable-doxygen</i></dt>
				852	<dd>Look for the doxygen program and enable construction of doxygen based
				853	documentation from the source code. This is disabled by default because
				854	generating the documentation can take a long time and producess 100s of
				855	megabytes of output.</dd>
Anton Korobeynikov	c7f9f3d	2007-01-23 12:35:46 +0000	[diff] [blame]	856	<dt><i>--with-udis86</i></dt>
				857	<dd>LLVM can use external disassembler library for various purposes (now it's
				858	used only for examining code produced by JIT). This option will enable usage
				859	of <a href="http://udis86.sourceforge.net/">udis86</a> x86 (both 32 and 64
				860	bits) disassembler library.</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	861	</dl>
				862
				863	<p>To configure LLVM, follow these steps:</p>
				864
				865	<ol>
				866	<li>Change directory into the object root directory:
John Criswell	f531f31	2003-10-27 18:18:16 +0000	[diff] [blame]	867	<br>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	868	<tt>cd <i>OBJ_ROOT</i></tt>
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	869	<br><br>
John Criswell	f531f31	2003-10-27 18:18:16 +0000	[diff] [blame]	870
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	871	<li>Run the <tt>configure</tt> script located in the LLVM source tree:
				872	<br>
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	873	<tt><i>SRC_ROOT</i>/configure --prefix=/install/path [other options]</tt>
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	874	<br><br>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	875	</ol>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	876
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	877	</div>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	878
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	879	<!-- ======================================================================= -->
				880	<div class="doc_subsection">
				881	<a name="compile">Compiling the LLVM Suite Source Code</a>
				882	</div>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	883
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	884	<div class="doc_text">
John Criswell	71139f2	2003-07-08 20:35:59 +0000	[diff] [blame]	885
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	886	<p>Once you have configured LLVM, you can build it. There are three types of
				887	builds:</p>
John Criswell	71139f2	2003-07-08 20:35:59 +0000	[diff] [blame]	888
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	889	<dl>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	890	<dt>Debug Builds
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	891	<dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	892	These builds are the default when one types <tt>gmake</tt> (unless the
				893	<tt>--enable-optimized</tt> option was used during configuration). The
				894	build system will compile the tools and libraries with debugging
				895	information.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	896	<br><br>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	897
				898	<dt>Release (Optimized) Builds
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	899	<dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	900	These builds are enabled with the <tt>--enable-optimized</tt> option to
				901	<tt>configure</tt> or by specifying <tt>ENABLE_OPTIMIZED=1</tt> on the
				902	<tt>gmake</tt> command line. For these builds, the build system will
				903	compile the tools and libraries with GCC optimizations enabled and strip
				904	debugging information from the libraries and executables it generates.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	905	<br><br>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	906
				907	<dt>Profile Builds
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	908	<dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	909	These builds are for use with profiling. They compile profiling
				910	information into the code for use with programs like <tt>gprof</tt>.
				911	Profile builds must be started by specifying <tt>ENABLE_PROFILING=1</tt>
				912	on the <tt>gmake</tt> command line.
				913	</dl>
John Criswell	3ef61af	2003-06-30 21:59:07 +0000	[diff] [blame]	914
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	915	<p>Once you have LLVM configured, you can build it by entering the
				916	<i>OBJ_ROOT</i> directory and issuing the following command:</p>
John Criswell	38cc2b5	2003-10-10 14:26:14 +0000	[diff] [blame]	917
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	918	<p><tt>gmake</tt></p>
John Criswell	38cc2b5	2003-10-10 14:26:14 +0000	[diff] [blame]	919
Chris Lattner	e0050f0	2004-07-18 22:32:22 +0000	[diff] [blame]	920	<p>If the build fails, please <a href="#brokengcc">check here</a> to see if you
John Criswell	6ab273c	2004-12-08 17:53:54 +0000	[diff] [blame]	921	are using a version of GCC that is known not to compile LLVM.</p>
Chris Lattner	e0050f0	2004-07-18 22:32:22 +0000	[diff] [blame]	922
				923	<p>
				924	If you have multiple processors in your machine, you may wish to use some of
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	925	the parallel build options provided by GNU Make. For example, you could use the
				926	command:</p>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	927
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	928	<p><tt>gmake -j2</tt></p>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	929
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	930	<p>There are several special targets which are useful when working with the LLVM
				931	source code:</p>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	932
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	933	<dl>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	934	<dt><tt>gmake clean</tt>
				935	<dd>
				936	Removes all files generated by the build. This includes object files,
				937	generated C/C++ files, libraries, and executables.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	938	<br><br>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	939
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	940	<dt><tt>gmake dist-clean</tt>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	941	<dd>
Misha Brukman	5d41391	2004-08-21 23:40:49 +0000	[diff] [blame]	942	Removes everything that <tt>gmake clean</tt> does, but also removes files
				943	generated by <tt>configure</tt>. It attempts to return the source tree to the
				944	original state in which it was shipped.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	945	<br><br>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	946
Misha Brukman	62a2c1f	2004-08-23 20:25:33 +0000	[diff] [blame]	947	<dt><tt>gmake install</tt>
				948	<dd>
John Criswell	6ab273c	2004-12-08 17:53:54 +0000	[diff] [blame]	949	Installs LLVM header files, libraries, tools, and documentation in a
				950	hierarchy
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	951	under $PREFIX, specified with <tt>./configure --prefix=[dir]</tt>, which
				952	defaults to <tt>/usr/local</tt>.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	953	<br><br>
				954
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	955	<dt><tt>gmake -C runtime install-bytecode</tt>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	956	<dd>
Reid Spencer	45dc139	2004-11-11 07:30:27 +0000	[diff] [blame]	957	Assuming you built LLVM into $OBJDIR, when this command is run, it will
				958	install bytecode libraries into the GCC front end's bytecode library
				959	directory. If you need to update your bytecode libraries,
Misha Brukman	5d41391	2004-08-21 23:40:49 +0000	[diff] [blame]	960	this is the target to use once you've built them.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	961	<br><br>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	962	</dl>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	963
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	964	<p>Please see the <a href="MakefileGuide.html">Makefile Guide</a> for further
				965	details on these <tt>make</tt> targets and descriptions of other targets
				966	available.</p>
				967
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	968	<p>It is also possible to override default values from <tt>configure</tt> by
				969	declaring variables on the command line. The following are some examples:</p>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	970
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	971	<dl>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	972	<dt><tt>gmake ENABLE_OPTIMIZED=1</tt>
				973	<dd>
				974	Perform a Release (Optimized) build.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	975	<br><br>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	976
Reid Spencer	3dc3ea7	2006-04-09 23:45:38 +0000	[diff] [blame]	977	<dt><tt>gmake ENABLE_OPTIMIZED=1 DISABLE_ASSERTIONS=1</tt>
Chris Lattner	0f546dd	2006-03-21 01:10:57 +0000	[diff] [blame]	978	<dd>
Reid Spencer	3dc3ea7	2006-04-09 23:45:38 +0000	[diff] [blame]	979	Perform a Release (Optimized) build without assertions enabled.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	980	<br><br>
Chris Lattner	0f546dd	2006-03-21 01:10:57 +0000	[diff] [blame]	981
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	982	<dt><tt>gmake ENABLE_PROFILING=1</tt>
				983	<dd>
				984	Perform a Profiling build.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	985	<br><br>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	986
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	987	<dt><tt>gmake VERBOSE=1</tt>
				988	<dd>
				989	Print what <tt>gmake</tt> is doing on standard output.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	990	<br><br>
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	991
				992	<dt><tt>gmake TOOL_VERBOSE=1</tt></dt>
				993	<dd>Ask each tool invoked by the makefiles to print out what it is doing on
John Criswell	6ab273c	2004-12-08 17:53:54 +0000	[diff] [blame]	994	the standard output. This also implies <tt>VERBOSE=1</tt>.
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	995	<br><br></dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	996	</dl>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	997
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	998	<p>Every directory in the LLVM object tree includes a <tt>Makefile</tt> to build
				999	it and any subdirectories that it contains. Entering any directory inside the
				1000	LLVM object tree and typing <tt>gmake</tt> should rebuild anything in or below
				1001	that directory that is out of date.</p>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	1002
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1003	</div>
John Criswell	38cc2b5	2003-10-10 14:26:14 +0000	[diff] [blame]	1004
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1005	<!-- ======================================================================= -->
				1006	<div class="doc_subsection">
Reid Spencer	734b74f	2006-07-27 06:41:31 +0000	[diff] [blame]	1007	<a name="cross-compile">Cross-Compiling LLVM</a>
Reid Spencer	d966b24	2006-07-27 05:43:30 +0000	[diff] [blame]	1008	</div>
				1009
				1010	<div class="doc_text">
Reid Spencer	734b74f	2006-07-27 06:41:31 +0000	[diff] [blame]	1011	<p>It is possible to cross-compile LLVM. That is, you can create LLVM
				1012	executables and libraries for a platform different than the one one which you
				1013	are compiling. To do this, a few additional steps are
				1014	required. <sup><a href="#ccn_1">1</a></sup> To cross-compile LLVM, use
Reid Spencer	d966b24	2006-07-27 05:43:30 +0000	[diff] [blame]	1015	these instructions:</p>
				1016	<ol>
Reid Spencer	734b74f	2006-07-27 06:41:31 +0000	[diff] [blame]	1017	<li>Configure and build LLVM as a native compiler. You will need
Reid Spencer	d966b24	2006-07-27 05:43:30 +0000	[diff] [blame]	1018	just <tt>TableGen</tt> from that build.
				1019	<ul>
				1020	<li>If you have <tt>$LLVM_OBJ_ROOT=$LLVM_SRC_ROOT</tt> just execute
				1021	<tt>make -C utils/TableGen</tt> after configuring.</li>
				1022	<li>Otherwise you will need to monitor building process and terminate
				1023	it just after <tt>TableGen</tt> was built.</li>
				1024	</ul>
				1025	</li>
				1026	<li>Copy the TableGen binary to somewhere safe (out of your build tree).
				1027	</li>
Reid Spencer	734b74f	2006-07-27 06:41:31 +0000	[diff] [blame]	1028	<li>Configure LLVM to build with a cross-compiler. To do this, supply the
Reid Spencer	d966b24	2006-07-27 05:43:30 +0000	[diff] [blame]	1029	configure script with <tt>--build</tt> and <tt>--host</tt> options that
Reid Spencer	734b74f	2006-07-27 06:41:31 +0000	[diff] [blame]	1030	are different. The values of these options must be legal target triples
				1031	that your GCC compiler supports.</li>
Reid Spencer	d966b24	2006-07-27 05:43:30 +0000	[diff] [blame]	1032	<li>Put the saved <tt>TableGen</tt> executable into the
				1033	into <tt>$LLVM_OBJ_ROOT/{BUILD_TYPE}/bin</tt> directory (e.g. into
				1034	<tt>.../Release/bin</tt> for a Release build).</li>
				1035	<li>Build LLVM as usual.</li>
				1036	</ol>
Reid Spencer	734b74f	2006-07-27 06:41:31 +0000	[diff] [blame]	1037	<p>The result of such a build will produce executables that are not executable
				1038	on your build host (--build option) but can be executed on your compile host
				1039	(--host option).</p>
Reid Spencer	d966b24	2006-07-27 05:43:30 +0000	[diff] [blame]	1040	<p><b>Notes:</b></p>
				1041	<div class="doc_notes">
				1042	<ol>
				1043	<li><a name="ccn_1">Cross-compiling</a> was tested only with Linux as
				1044	build platform and Windows as host using mingw32 cross-compiler. Other
				1045	combinations have not been tested.</li>
				1046	</ol>
				1047	</div>
				1048	</div>
				1049
				1050	<!-- ======================================================================= -->
				1051	<div class="doc_subsection">
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1052	<a name="objfiles">The Location of LLVM Object Files</a>
				1053	</div>
John Criswell	38cc2b5	2003-10-10 14:26:14 +0000	[diff] [blame]	1054
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1055	<div class="doc_text">
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	1056
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1057	<p>The LLVM build system is capable of sharing a single LLVM source tree among
				1058	several LLVM builds. Hence, it is possible to build LLVM for several different
				1059	platforms or configurations using the same source tree.</p>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	1060
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1061	<p>This is accomplished in the typical autoconf manner:</p>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	1062
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1063	<ul>
				1064	<li><p>Change directory to where the LLVM object files should live:</p>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	1065
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1066	<p><tt>cd <i>OBJ_ROOT</i></tt></p></li>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	1067
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1068	<li><p>Run the <tt>configure</tt> script found in the LLVM source
				1069	directory:</p>
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	1070
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1071	<p><tt><i>SRC_ROOT</i>/configure</tt></p></li>
				1072	</ul>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1073
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1074	<p>The LLVM build will place files underneath <i>OBJ_ROOT</i> in directories
				1075	named after the build type:</p>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1076
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1077	<dl>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1078	<dt>Debug Builds
				1079	<dd>
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1080	<dl>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1081	<dt>Tools
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	1082	<dd><tt><i>OBJ_ROOT</i>/Debug/bin</tt>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1083	<dt>Libraries
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	1084	<dd><tt><i>OBJ_ROOT</i>/Debug/lib</tt>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1085	</dl>
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1086	<br><br>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1087
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1088	<dt>Release Builds
				1089	<dd>
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1090	<dl>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1091	<dt>Tools
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	1092	<dd><tt><i>OBJ_ROOT</i>/Release/bin</tt>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1093	<dt>Libraries
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	1094	<dd><tt><i>OBJ_ROOT</i>/Release/lib</tt>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1095	</dl>
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1096	<br><br>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1097
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1098	<dt>Profile Builds
				1099	<dd>
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1100	<dl>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1101	<dt>Tools
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	1102	<dd><tt><i>OBJ_ROOT</i>/Profile/bin</tt>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1103	<dt>Libraries
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	1104	<dd><tt><i>OBJ_ROOT</i>/Profile/lib</tt>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1105	</dl>
				1106	</dl>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1107
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1108	</div>
Chris Lattner	1c1ef11	2002-07-24 19:51:14 +0000	[diff] [blame]	1109
Chris Lattner	998c067	2004-03-25 20:38:40 +0000	[diff] [blame]	1110	<!-- ======================================================================= -->
				1111	<div class="doc_subsection">
				1112	<a name="optionalconfig">Optional Configuration Items</a>
				1113	</div>
				1114
				1115	<div class="doc_text">
				1116
				1117	<p>
Misha Brukman	20b8a656	2005-02-03 22:25:23 +0000	[diff] [blame]	1118	If you're running on a Linux system that supports the "<a
Reid Spencer	dfcf790	2004-12-08 16:51:31 +0000	[diff] [blame]	1119	href="http://www.tat.physik.uni-tuebingen.de/~rguenth/linux/binfmt_misc.html">
				1120	binfmt_misc</a>"
Chris Lattner	998c067	2004-03-25 20:38:40 +0000	[diff] [blame]	1121	module, and you have root access on the system, you can set your system up to
				1122	execute LLVM bytecode files directly. To do this, use commands like this (the
				1123	first command may not be required if you are already using the module):</p>
				1124
Misha Brukman	20b8a656	2005-02-03 22:25:23 +0000	[diff] [blame]	1125	<div class="doc_code">
Chris Lattner	998c067	2004-03-25 20:38:40 +0000	[diff] [blame]	1126	<pre>
				1127	$ mount -t binfmt_misc none /proc/sys/fs/binfmt_misc
Misha Brukman	20b8a656	2005-02-03 22:25:23 +0000	[diff] [blame]	1128	$ echo ':llvm:M::llvm::/path/to/lli:' > /proc/sys/fs/binfmt_misc/register
Chris Lattner	998c067	2004-03-25 20:38:40 +0000	[diff] [blame]	1129	$ chmod u+x hello.bc (if needed)
				1130	$ ./hello.bc
				1131	</pre>
Misha Brukman	20b8a656	2005-02-03 22:25:23 +0000	[diff] [blame]	1132	</div>
Chris Lattner	998c067	2004-03-25 20:38:40 +0000	[diff] [blame]	1133
				1134	<p>
				1135	This allows you to execute LLVM bytecode files directly. Thanks to Jack
				1136	Cummings for pointing this out!
				1137	</p>
				1138
				1139	</div>
				1140
				1141
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1142	<!-- *********************************************************************** -->
				1143	<div class="doc_section">
				1144	<a name="layout"><b>Program Layout</b></a>
				1145	</div>
				1146	<!-- *********************************************************************** -->
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1147
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1148	<div class="doc_text">
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1149
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1150	<p>One useful source of information about the LLVM source base is the LLVM <a
John Criswell	64f13ab	2004-03-12 20:31:37 +0000	[diff] [blame]	1151	href="http://www.doxygen.org">doxygen</a> documentation available at <tt><a
Reid Spencer	ca05854	2006-03-14 05:39:39 +0000	[diff] [blame]	1152	href="http://llvm.org/doxygen/">http://llvm.org/doxygen/</a></tt>.
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1153	The following is a brief introduction to code layout:</p>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1154
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1155	</div>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1156
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1157	<!-- ======================================================================= -->
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1158	<div class="doc_subsection"><a name="cvsdir"><tt>CVS</tt> directories</a></div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1159	<div class="doc_text">
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1160	<p>Every directory checked out of CVS will contain a <tt>CVS</tt> directory; for
				1161	the most part these can just be ignored.</p>
Reid Spencer	5be4f04	2004-12-08 16:18:26 +0000	[diff] [blame]	1162	</div>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1163
Reid Spencer	5be4f04	2004-12-08 16:18:26 +0000	[diff] [blame]	1164	<!-- ======================================================================= -->
				1165	<div class="doc_subsection"><a name="examples"><tt>llvm/examples</tt></a></div>
				1166	<div class="doc_text">
				1167	<p>This directory contains some simple examples of how to use the LLVM IR and
				1168	JIT.</p>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1169	</div>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1170
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1171	<!-- ======================================================================= -->
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1172	<div class="doc_subsection"><a name="include"><tt>llvm/include</tt></a></div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1173	<div class="doc_text">
				1174
				1175	<p>This directory contains public header files exported from the LLVM
				1176	library. The three main subdirectories of this directory are:</p>
				1177
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1178	<dl>
				1179	<dt><tt><b>llvm/include/llvm</b></tt></dt>
				1180	<dd>This directory contains all of the LLVM specific header files. This
				1181	directory also has subdirectories for different portions of LLVM:
				1182	<tt>Analysis</tt>, <tt>CodeGen</tt>, <tt>Target</tt>, <tt>Transforms</tt>,
				1183	etc...</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1184
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1185	<dt><tt><b>llvm/include/llvm/Support</b></tt></dt>
				1186	<dd>This directory contains generic support libraries that are provided with
				1187	LLVM but not necessarily specific to LLVM. For example, some C++ STL utilities
				1188	and a Command Line option processing library store their header files here.
				1189	</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1190
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1191	<dt><tt><b>llvm/include/llvm/Config</b></tt></dt>
				1192	<dd>This directory contains header files configured by the <tt>configure</tt>
				1193	script. They wrap "standard" UNIX and C header files. Source code can
				1194	include these header files which automatically take care of the conditional
				1195	#includes that the <tt>configure</tt> script generates.</dd>
				1196	</dl>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1197	</div>
				1198
				1199	<!-- ======================================================================= -->
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1200	<div class="doc_subsection"><a name="lib"><tt>llvm/lib</tt></a></div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1201	<div class="doc_text">
				1202
				1203	<p>This directory contains most of the source files of the LLVM system. In LLVM,
				1204	almost all code exists in libraries, making it very easy to share code among the
				1205	different <a href="#tools">tools</a>.</p>
				1206
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1207	<dl>
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1208	<dt><tt><b>llvm/lib/VMCore/</b></tt></dt>
				1209	<dd> This directory holds the core LLVM source files that implement core
				1210	classes like Instruction and BasicBlock.</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1211
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1212	<dt><tt><b>llvm/lib/AsmParser/</b></tt></dt>
				1213	<dd>This directory holds the source code for the LLVM assembly language parser
				1214	library.</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1215
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1216	<dt><tt><b>llvm/lib/ByteCode/</b></tt></dt>
				1217	<dd>This directory holds code for reading and write LLVM bytecode.</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1218
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1219	<dt><tt><b>llvm/lib/Analysis/</b></tt><dd>This directory contains a variety of
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1220	different program analyses, such as Dominator Information, Call Graphs,
				1221	Induction Variables, Interval Identification, Natural Loop Identification,
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1222	etc.</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1223
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1224	<dt><tt><b>llvm/lib/Transforms/</b></tt></dt>
				1225	<dd> This directory contains the source code for the LLVM to LLVM program
				1226	transformations, such as Aggressive Dead Code Elimination, Sparse Conditional
				1227	Constant Propagation, Inlining, Loop Invariant Code Motion, Dead Global
				1228	Elimination, and many others.</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1229
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1230	<dt><tt><b>llvm/lib/Target/</b></tt></dt>
				1231	<dd> This directory contains files that describe various target architectures
Chris Lattner	7991e85	2006-04-20 17:42:23 +0000	[diff] [blame]	1232	for code generation. For example, the <tt>llvm/lib/Target/X86</tt>
				1233	directory holds the X86 machine description while
John Criswell	e1a8120	2005-05-18 19:43:33 +0000	[diff] [blame]	1234	<tt>llvm/lib/Target/CBackend</tt> implements the LLVM-to-C converter.</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1235
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1236	<dt><tt><b>llvm/lib/CodeGen/</b></tt></dt>
				1237	<dd> This directory contains the major parts of the code generator: Instruction
				1238	Selector, Instruction Scheduling, and Register Allocation.</dd>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1239
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1240	<dt><tt><b>llvm/lib/Debugger/</b></tt></dt>
				1241	<dd> This directory contains the source level debugger library that makes
				1242	it possible to instrument LLVM programs so that a debugger could identify
				1243	source code locations at which the program is executing.</dd>
				1244
				1245	<dt><tt><b>llvm/lib/ExecutionEngine/</b></tt></dt>
				1246	<dd> This directory contains libraries for executing LLVM bytecode directly
				1247	at runtime in both interpreted and JIT compiled fashions.</dd>
				1248
				1249	<dt><tt><b>llvm/lib/Support/</b></tt></dt>
				1250	<dd> This directory contains the source code that corresponds to the header
				1251	files located in <tt>llvm/include/Support/</tt>.</dd>
				1252
				1253	<dt><tt><b>llvm/lib/System/</b></tt></dt>
				1254	<dd>This directory contains the operating system abstraction layer that
				1255	shields LLVM from platform-specific coding.</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1256	</dl>
John Criswell	3ef61af	2003-06-30 21:59:07 +0000	[diff] [blame]	1257
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1258	</div>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1259
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1260	<!-- ======================================================================= -->
Reid Spencer	5be4f04	2004-12-08 16:18:26 +0000	[diff] [blame]	1261	<div class="doc_subsection"><a name="projects"><tt>llvm/projects</tt></a></div>
				1262	<div class="doc_text">
				1263	<p>This directory contains projects that are not strictly part of LLVM but are
				1264	shipped with LLVM. This is also the directory where you should create your own
				1265	LLVM-based projects. See <tt>llvm/projects/sample</tt> for an example of how
				1266	to set up your own project. See <tt>llvm/projects/Stacker</tt> for a fully
				1267	functional example of a compiler front end.</p>
				1268	</div>
				1269
				1270	<!-- ======================================================================= -->
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1271	<div class="doc_subsection"><a name="runtime"><tt>llvm/runtime</tt></a></div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1272	<div class="doc_text">
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1273
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1274	<p>This directory contains libraries which are compiled into LLVM bytecode and
				1275	used when linking programs with the GCC front end. Most of these libraries are
				1276	skeleton versions of real libraries; for example, libc is a stripped down
				1277	version of glibc.</p>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1278
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1279	<p>Unlike the rest of the LLVM suite, this directory needs the LLVM GCC front
				1280	end to compile.</p>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1281
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1282	</div>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1283
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1284	<!-- ======================================================================= -->
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1285	<div class="doc_subsection"><a name="test"><tt>llvm/test</tt></a></div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1286	<div class="doc_text">
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1287	<p>This directory contains feature and regression tests and other basic sanity
				1288	checks on the LLVM infrastructure. These are intended to run quickly and cover
				1289	a lot of territory without being exhaustive.</p>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1290	</div>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1291
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1292	<!-- ======================================================================= -->
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1293	<div class="doc_subsection"><a name="llvmtest"><tt>llvm-test</tt></a></div>
				1294	<div class="doc_text">
John Criswell	6ab273c	2004-12-08 17:53:54 +0000	[diff] [blame]	1295	<p>This is not a directory in the normal llvm module; it is a separate CVS
Misha Brukman	b4bd8de	2004-11-15 23:20:51 +0000	[diff] [blame]	1296	module that must be checked out (usually to <tt>projects/llvm-test</tt>). This
John Criswell	6ab273c	2004-12-08 17:53:54 +0000	[diff] [blame]	1297	module contains a comprehensive correctness, performance, and benchmarking
				1298	test
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1299	suite for LLVM. It is a separate CVS module because not every LLVM user is
John Criswell	cfdeb5c	2005-05-09 16:39:27 +0000	[diff] [blame]	1300	interested in downloading or building such a comprehensive test suite. For
				1301	further details on this test suite, please see the
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1302	<a href="TestingGuide.html">Testing Guide</a> document.</p>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1303	</div>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1304
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1305	<!-- ======================================================================= -->
				1306	<div class="doc_subsection"><a name="tools"><tt>llvm/tools</tt></a></div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1307	<div class="doc_text">
John Criswell	38cc2b5	2003-10-10 14:26:14 +0000	[diff] [blame]	1308
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1309	<p>The <b>tools</b> directory contains the executables built out of the
				1310	libraries above, which form the main part of the user interface. You can
				1311	always get help for a tool by typing <tt>tool_name --help</tt>. The
Misha Brukman	b4bd8de	2004-11-15 23:20:51 +0000	[diff] [blame]	1312	following is a brief introduction to the most important tools. More detailed
				1313	information is in the <a href="CommandGuide/index.html">Command Guide</a>.</p>
John Criswell	38cc2b5	2003-10-10 14:26:14 +0000	[diff] [blame]	1314
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1315	<dl>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1316
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1317	<dt><tt><b>bugpoint</b></tt></dt>
				1318	<dd><tt>bugpoint</tt> is used to debug
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1319	optimization passes or code generation backends by narrowing down the
				1320	given test case to the minimum number of passes and/or instructions that
				1321	still cause a problem, whether it is a crash or miscompilation. See <a
				1322	href="HowToSubmitABug.html">HowToSubmitABug.html</a> for more information
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1323	on using <tt>bugpoint</tt>.</dd>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1324
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1325	<dt><tt><b>llvmc</b></tt></dt>
				1326	<dd>The LLVM Compiler Driver. This program can
				1327	be configured to utilize both LLVM and non-LLVM compilation tools to enable
				1328	pre-processing, translation, optimization, assembly, and linking of programs
				1329	all from one command line. <tt>llvmc</tt> also takes care of processing the
				1330	dependent libraries found in bytecode. This reduces the need to get the
Reid Spencer	92815e5	2004-12-08 18:00:30 +0000	[diff] [blame]	1331	traditional <tt>-l<name></tt> options right on the command line. Please
John Criswell	e1a8120	2005-05-18 19:43:33 +0000	[diff] [blame]	1332	note that this tool, while functional, is still experimental and not feature
				1333	complete.</dd>
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1334
				1335	<dt><tt><b>llvm-ar</b></tt></dt>
				1336	<dd>The archiver produces an archive containing
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1337	the given LLVM bytecode files, optionally with an index for faster
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1338	lookup.</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1339
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1340	<dt><tt><b>llvm-as</b></tt></dt>
				1341	<dd>The assembler transforms the human readable LLVM assembly to LLVM
				1342	bytecode.</dd>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1343
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1344	<dt><tt><b>llvm-dis</b></tt></dt>
				1345	<dd>The disassembler transforms the LLVM bytecode to human readable
				1346	LLVM assembly.</dd>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1347
Reid Spencer	92815e5	2004-12-08 18:00:30 +0000	[diff] [blame]	1348	<dt><tt><b>llvm-ld</b></tt></dt>
Reid Spencer	a7974cc	2007-02-09 15:59:08 +0000	[diff] [blame]	1349	<dd><tt>llvm-ld</tt> is a general purpose and extensible linker for LLVM.
				1350	This is the linker invoked by <tt>llvmc</tt>. It performsn standard link time
				1351	optimizations and allows optimization modules to be loaded and run so that
				1352	language specific optimizations can be applied at link time.</dd>
Reid Spencer	92815e5	2004-12-08 18:00:30 +0000	[diff] [blame]	1353
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1354	<dt><tt><b>llvm-link</b></tt></dt>
				1355	<dd><tt>llvm-link</tt>, not surprisingly, links multiple LLVM modules into
				1356	a single program.</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1357
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1358	<dt><tt><b>lli</b></tt></dt>
				1359	<dd><tt>lli</tt> is the LLVM interpreter, which
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1360	can directly execute LLVM bytecode (although very slowly...). In addition
				1361	to a simple interpreter, <tt>lli</tt> also has a tracing mode (entered by
				1362	specifying <tt>-trace</tt> on the command line). Finally, for
John Criswell	945f802	2004-12-08 18:04:14 +0000	[diff] [blame]	1363	architectures that support it (currently x86, Sparc, and PowerPC), by default,
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1364	<tt>lli</tt> will function as a Just-In-Time compiler (if the
				1365	functionality was compiled in), and will execute the code <i>much</i>
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1366	faster than the interpreter.</dd>
Misha Brukman	994d7e8	2003-10-06 19:23:34 +0000	[diff] [blame]	1367
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1368	<dt><tt><b>llc</b></tt></dt>
				1369	<dd> <tt>llc</tt> is the LLVM backend compiler, which
John Criswell	e1a8120	2005-05-18 19:43:33 +0000	[diff] [blame]	1370	translates LLVM bytecode to a native code assembly file or to C code (with
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1371	the -march=c option).</dd>
Misha Brukman	994d7e8	2003-10-06 19:23:34 +0000	[diff] [blame]	1372
Reid Spencer	788b0fd	2004-12-22 06:29:07 +0000	[diff] [blame]	1373	<dt><tt><b>llvm-gcc</b></tt></dt>
Reid Spencer	a7974cc	2007-02-09 15:59:08 +0000	[diff] [blame]	1374	<dd><tt>llvm-gcc</tt> is a GCC-based C frontend that has been retargeted to
				1375	use LLVM as its backend instead of GCC's RTL backend. It can also emit LLVM
				1376	byte code or assembly (with the <tt>-emit-llvm</tt> option) instead of the
				1377	usual machine code output. It works just like any other GCC compiler,
				1378	taking the typical <tt>-c, -S, -E, -o</tt> options that are typically used.
				1379	Additionally, the the source code for <tt>llvm-gcc</tt> is available as a
				1380	separate CVS module.</dd>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1381
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1382	<dt><tt><b>opt</b></tt></dt>
Reid Spencer	80f843d	2006-08-28 00:34:19 +0000	[diff] [blame]	1383	<dd><tt>opt</tt> reads LLVM bytecode, applies a series of LLVM to LLVM
				1384	transformations (which are specified on the command line), and then outputs
				1385	the resultant bytecode. The '<tt>opt --help</tt>' command is a good way to
				1386	get a list of the program transformations available in LLVM.<br/>
				1387	<dd><tt>opt</tt> can also be used to run a specific analysis on an input
				1388	LLVM bytecode file and print out the results. It is primarily useful for
				1389	debugging analyses, or familiarizing yourself with what an analysis does.</dd>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1390	</dl>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1391	</div>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1392
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1393	<!-- ======================================================================= -->
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1394	<div class="doc_subsection"><a name="utils"><tt>llvm/utils</tt></a></div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1395	<div class="doc_text">
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1396
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1397	<p>This directory contains utilities for working with LLVM source code, and some
				1398	of the utilities are actually required as part of the build process because they
				1399	are code generators for parts of LLVM infrastructure.</p>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1400
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1401	<dl>
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1402	<dt><tt><b>codegen-diff</b></tt> <dd><tt>codegen-diff</tt> is a script
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1403	that finds differences between code that LLC generates and code that LLI
				1404	generates. This is a useful tool if you are debugging one of them,
				1405	assuming that the other generates correct output. For the full user
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1406	manual, run <tt>`perldoc codegen-diff'</tt>.<br><br>
Misha Brukman	efe54be	2003-08-11 18:45:46 +0000	[diff] [blame]	1407
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1408	<dt><tt><b>cvsupdate</b></tt> <dd><tt>cvsupdate</tt> is a script that will
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1409	update your CVS tree, but produce a much cleaner and more organized output
				1410	than simply running <tt>`cvs -z3 up -dP'</tt> will. For example, it will group
				1411	together all the new and updated files and modified files in separate
				1412	sections, so you can see at a glance what has changed. If you are at the
				1413	top of your LLVM CVS tree, running <tt>utils/cvsupdate</tt> is the
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1414	preferred way of updating the tree.<br><br>
Misha Brukman	efe54be	2003-08-11 18:45:46 +0000	[diff] [blame]	1415
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1416	<dt><tt><b>emacs/</b></tt> <dd>The <tt>emacs</tt> directory contains
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1417	syntax-highlighting files which will work with Emacs and XEmacs editors,
				1418	providing syntax highlighting support for LLVM assembly files and TableGen
				1419	description files. For information on how to use the syntax files, consult
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1420	the <tt>README</tt> file in that directory.<br><br>
Misha Brukman	efe54be	2003-08-11 18:45:46 +0000	[diff] [blame]	1421
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1422	<dt><tt><b>getsrcs.sh</b></tt> <dd>The <tt>getsrcs.sh</tt> script finds
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1423	and outputs all non-generated source files, which is useful if one wishes
				1424	to do a lot of development across directories and does not want to
				1425	individually find each file. One way to use it is to run, for example:
				1426	<tt>xemacs `utils/getsources.sh`</tt> from the top of your LLVM source
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1427	tree.<br><br>
				1428
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1429	<dt><tt><b>llvmgrep</b></tt></dt>
				1430	<dd>This little tool performs an "egrep -H -n" on each source file in LLVM and
				1431	passes to it a regular expression provided on <tt>llvmgrep</tt>'s command
				1432	line. This is a very efficient way of searching the source base for a
				1433	particular regular expression.</dd>
				1434
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1435	<dt><tt><b>makellvm</b></tt> <dd>The <tt>makellvm</tt> script compiles all
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1436	files in the current directory and then compiles and links the tool that
				1437	is the first argument. For example, assuming you are in the directory
				1438	<tt>llvm/lib/Target/Sparc</tt>, if <tt>makellvm</tt> is in your path,
				1439	simply running <tt>makellvm llc</tt> will make a build of the current
				1440	directory, switch to directory <tt>llvm/tools/llc</tt> and build it,
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1441	causing a re-linking of LLC.<br><br>
Misha Brukman	efe54be	2003-08-11 18:45:46 +0000	[diff] [blame]	1442
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1443	<dt><tt><b>NightlyTest.pl</b></tt> and
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1444	<tt><b>NightlyTestTemplate.html</b></tt> <dd>These files are used in a
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1445	cron script to generate nightly status reports of the functionality of
				1446	tools, and the results can be seen by following the appropriate link on
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1447	the <a href="http://llvm.org/">LLVM homepage</a>.<br><br>
Misha Brukman	efe54be	2003-08-11 18:45:46 +0000	[diff] [blame]	1448
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1449	<dt><tt><b>TableGen/</b></tt> <dd>The <tt>TableGen</tt> directory contains
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1450	the tool used to generate register descriptions, instruction set
				1451	descriptions, and even assemblers from common TableGen description
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1452	files.<br><br>
Misha Brukman	efe54be	2003-08-11 18:45:46 +0000	[diff] [blame]	1453
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1454	<dt><tt><b>vim/</b></tt> <dd>The <tt>vim</tt> directory contains
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1455	syntax-highlighting files which will work with the VIM editor, providing
				1456	syntax highlighting support for LLVM assembly files and TableGen
				1457	description files. For information on how to use the syntax files, consult
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1458	the <tt>README</tt> file in that directory.<br><br>
Misha Brukman	efe54be	2003-08-11 18:45:46 +0000	[diff] [blame]	1459
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1460	</dl>
Misha Brukman	efe54be	2003-08-11 18:45:46 +0000	[diff] [blame]	1461
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1462	</div>
Misha Brukman	efe54be	2003-08-11 18:45:46 +0000	[diff] [blame]	1463
Reid Spencer	5be4f04	2004-12-08 16:18:26 +0000	[diff] [blame]	1464	<!-- ======================================================================= -->
				1465	<div class="doc_subsection"><a name="win32"><tt>llvm/win32</tt></a></div>
				1466	<div class="doc_text">
				1467	<p>This directory contains build scripts and project files for use with
				1468	Visual C++. This allows developers on Windows to build LLVM without the need
John Criswell	6ab273c	2004-12-08 17:53:54 +0000	[diff] [blame]	1469	for Cygwin. The contents of this directory should be considered experimental
Reid Spencer	5be4f04	2004-12-08 16:18:26 +0000	[diff] [blame]	1470	at this time.
				1471	</p>
				1472	</div>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1473	<!-- *********************************************************************** -->
				1474	<div class="doc_section">
				1475	<a name="tutorial">An Example Using the LLVM Tool Chain</a>
				1476	</div>
				1477	<!-- *********************************************************************** -->
Misha Brukman	efe54be	2003-08-11 18:45:46 +0000	[diff] [blame]	1478
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1479	<div class="doc_text">
Chris Lattner	424d4dc	2007-01-04 07:08:27 +0000	[diff] [blame]	1480	<p>This section gives an example of using LLVM. llvm-gcc3 is now obsolete,
				1481	so we only include instructiosn for llvm-gcc4.
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	1482	</p>
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1483
				1484	<p><b>Note:</b> The <i>gcc4</i> frontend's invocation is <b><i>considerably different</i></b>
				1485	from the previous <i>gcc3</i> frontend. In particular, the <i>gcc4</i> frontend <b><i>does not</i></b>
				1486	create bytecode by default: <i>gcc4</i> produces native code. As the example below illustrates,
				1487	the '--emit-llvm' flag is needed to produce LLVM bytecode output. For <i>makefiles</i> and
				1488	<i>configure</i> scripts, the CFLAGS variable needs '--emit-llvm' to produce bytecode
				1489	output.</p>
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	1490	</div>
				1491
				1492	<!-- ======================================================================= -->
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1493	<div class="doc_subsection"><a name="tutorial4">Example with llvm-gcc4</a></div>
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	1494
				1495	<div class="doc_text">
				1496
				1497	<ol>
				1498	<li>First, create a simple C file, name it 'hello.c':
				1499	<pre>
				1500	#include <stdio.h>
				1501	int main() {
				1502	printf("hello world\n");
				1503	return 0;
				1504	}
				1505	</pre></li>
				1506
				1507	<li><p>Next, compile the C file into a native executable:</p>
				1508
				1509	<p><tt>% llvm-gcc hello.c -o hello</tt></p>
				1510
				1511	<p>Note that llvm-gcc works just like GCC by default. The standard -S and
				1512	-c arguments work as usual (producing a native .s or .o file,
				1513	respectively). </p>
				1514
				1515	<li><p>Next, compile the C file into a LLVM bytecode file:</p>
				1516	<p><tt>% llvm-gcc -O3 -emit-llvm hello.c -c -o hello.bc</tt></p>
				1517
				1518	<p>The -emit-llvm option can be used with the -S or -c options to emit an
				1519	LLVM ".ll" or ".bc" file (respectively) for the code. This allows you
				1520	to use the <a href="CommandGuide/index.html">standard LLVM tools</a> on
				1521	the bytecode file.</p>
				1522
				1523	<p>Unlike llvm-gcc3, llvm-gcc4 correctly responds to -O[0123] arguments.
				1524	</p></li>
				1525
				1526	<li><p>Run the program in both forms. To run the program, use:</p>
				1527
				1528	<p><tt>% ./hello</tt></p>
				1529
				1530	<p>and</p>
				1531
Chris Lattner	c7443af	2006-08-14 20:51:35 +0000	[diff] [blame]	1532	<p><tt>% lli hello.bc</tt></p>
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	1533
				1534	<p>The second examples shows how to invoke the LLVM JIT, <a
Chris Lattner	c7443af	2006-08-14 20:51:35 +0000	[diff] [blame]	1535	href="CommandGuide/html/lli.html">lli</a>.</p></li>
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	1536
				1537	<li><p>Use the <tt>llvm-dis</tt> utility to take a look at the LLVM assembly
				1538	code:</p>
				1539
Chris Lattner	4d7ce8a	2006-09-07 04:19:09 +0000	[diff] [blame]	1540	<p><tt>% llvm-dis < hello.bc \| less</tt><br><br></li>
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	1541
				1542	<li><p>Compile the program to native assembly using the LLC code
				1543	generator:</p>
				1544
				1545	<p><tt>% llc hello.bc -o hello.s</tt></p>
				1546
				1547	<li><p>Assemble the native assembly language file into a program:</p>
				1548
				1549	<p><b>Solaris:</b><tt>% /opt/SUNWspro/bin/cc -xarch=v9 hello.s -o hello.native</tt></p>
				1550	<p><b>Others:</b><tt>% gcc hello.s -o hello.native</tt></p>
				1551
				1552	<li><p>Execute the native code program:</p>
				1553
Chris Lattner	c7443af	2006-08-14 20:51:35 +0000	[diff] [blame]	1554	<p><tt>% ./hello.native</tt></p>
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	1555
				1556	<p>Note that using llvm-gcc to compile directly to native code (i.e. when
				1557	the -emit-llvm option is not present) does steps 6/7/8 for you.</p>
Chris Lattner	c7443af	2006-08-14 20:51:35 +0000	[diff] [blame]	1558	</li>
Chris Lattner	5b560d9	2006-08-14 20:45:25 +0000	[diff] [blame]	1559
				1560	</ol>
				1561
				1562	</div>
				1563
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1564
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1565	<!-- *********************************************************************** -->
				1566	<div class="doc_section">
				1567	<a name="problems">Common Problems</a>
				1568	</div>
				1569	<!-- *********************************************************************** -->
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	1570
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1571	<div class="doc_text">
John Criswell	c5eb460	2003-07-03 16:01:38 +0000	[diff] [blame]	1572
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1573	<p>If you are having problems building or using LLVM, or if you have any other
				1574	general questions about LLVM, please consult the <a href="FAQ.html">Frequently
				1575	Asked Questions</a> page.</p>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1576
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1577	</div>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1578
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1579	<!-- *********************************************************************** -->
				1580	<div class="doc_section">
				1581	<a name="links">Links</a>
				1582	</div>
				1583	<!-- *********************************************************************** -->
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1584
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1585	<div class="doc_text">
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1586
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1587	<p>This document is just an <b>introduction</b> to how to use LLVM to do
				1588	some simple things... there are many more interesting and complicated things
				1589	that you can do that aren't documented here (but we'll gladly accept a patch
				1590	if you want to write something up!). For more information about LLVM, check
				1591	out:</p>
John Criswell	72989a5	2003-06-12 19:34:44 +0000	[diff] [blame]	1592
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1593	<ul>
Reid Spencer	ca05854	2006-03-14 05:39:39 +0000	[diff] [blame]	1594	<li><a href="http://llvm.org/">LLVM homepage</a></li>
				1595	<li><a href="http://llvm.org/doxygen/">LLVM doxygen tree</a></li>
				1596	<li><a href="http://llvm.org/docs/Projects.html">Starting a Project
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1597	that Uses LLVM</a></li>
				1598	</ul>
				1599
				1600	</div>
				1601
				1602	<!-- *********************************************************************** -->
				1603
				1604	<hr>
Misha Brukman	74d4df8	2003-11-22 01:30:01 +0000	[diff] [blame]	1605	<address>
Misha Brukman	d3de5c6	2004-01-20 00:20:17 +0000	[diff] [blame]	1606	<a href="http://jigsaw.w3.org/css-validator/check/referer"><img
				1607	src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
				1608	<a href="http://validator.w3.org/check/referer"><img
				1609	src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
				1610
Misha Brukman	74d4df8	2003-11-22 01:30:01 +0000	[diff] [blame]	1611	<a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
Reid Spencer	075de23	2004-09-05 20:50:22 +0000	[diff] [blame]	1612	<a href="http://llvm.x10sys.com/rspencer/">Reid Spencer</a><br>
Reid Spencer	ca05854	2006-03-14 05:39:39 +0000	[diff] [blame]	1613	<a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1614	Last modified: $Date$
Misha Brukman	74d4df8	2003-11-22 01:30:01 +0000	[diff] [blame]	1615	</address>
Misha Brukman	560e989	2003-11-07 19:43:14 +0000	[diff] [blame]	1616	</body>
Guochun Shi	b65a78e	2002-07-17 23:05:56 +0000	[diff] [blame]	1617	</html>