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Misha Brukman	00c73d2	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	f4688a8	2002-07-17 23:05:56 +0000	[diff] [blame]	3	<html>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	4	<head>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	5	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman	00c73d2	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	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	10
Misha Brukman	00c73d2	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	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	14
Misha Brukman	00c73d2	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	96768ea	2003-02-14 04:22:13 +0000	[diff] [blame]	19	<ol>
Misha Brukman	00c73d2	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	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	22	<li><a href="#brokengcc">Broken versions of GCC</a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	23	</ol></li>
John Criswell	7a73b80	2003-06-30 21:59:07 +0000	[diff] [blame]	24
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	25	<li><a href="#starting">Getting Started with LLVM</a>
John Criswell	0b45920	2003-07-08 20:35:59 +0000	[diff] [blame]	26	<ol>
Misha Brukman	00c73d2	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	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	34	<li><a href="#cross-compile">Cross-Compiling LLVM</a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	35	<li><a href="#objfiles">The Location of LLVM Object Files</a>
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	36	<li><a href="#optionalconfig">Optional Configuration Items</a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	37	</ol></li>
John Criswell	0b45920	2003-07-08 20:35:59 +0000	[diff] [blame]	38
Misha Brukman	00c73d2	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	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	42	<li><a href="#examples"><tt>llvm/examples</tt></a>
Misha Brukman	00c73d2	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	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	45	<li><a href="#projects"><tt>llvm/projects</tt></a>
Misha Brukman	00c73d2	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	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	48	<li><a href="#llvmtest"><tt>llvm-test</tt></a>
Misha Brukman	00c73d2	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	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	51	<li><a href="#win32"><tt>llvm/win32</tt></a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	52	</ol></li>
John Criswell	0f6d7c0	2003-10-27 18:18:16 +0000	[diff] [blame]	53
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	54	<li><a href="#tutorial">An Example Using the LLVM Tool Chain</a>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	55	<ol>
				56	<li><a href="#tutorial4">Example with llvm-gcc4</a></li>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	57	</ol>
Misha Brukman	00c73d2	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	7911ce2	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	00c73d2	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	84f82f7	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	00c73d2	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	82ad9f1	2007-03-06 06:27:34 +0000	[diff] [blame]	92	end uses the GCC parser to convert code to LLVM. Once
Misha Brukman	00c73d2	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	3d8ba51	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	00c73d2	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	9f54791	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	9106eca	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	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	119	<ol>
Reid Spencer	d4694f9	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	f7b6be0	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	d4694f9	2004-12-22 06:29:07 +0000	[diff] [blame]	122	</li>
Tanya Lattner	f7b6be0	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	d4694f9	2004-12-22 06:29:07 +0000	[diff] [blame]	124	./fixheaders</tt></li>
Tanya Lattner	f7b6be0	2006-11-20 06:04:46 +0000	[diff] [blame]	125	<li>Add llvm-gcc's "bin" directory to your PATH variable.</li>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	126	</ol></li>
				127
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	128	<li>Get the LLVM Source Code
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	129	<ul>
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	130	<li>With the distributed files (or use <a href="#checkout">CVS</a>):
Misha Brukman	00c73d2	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	364cec4	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	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	134	</ol></li>
				135
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	136	</ul></li>
				137
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	138	<li><b>[Optional]</b> Get the Test Suite Source Code
John Criswell	9e2485c	2004-12-10 15:51:16 +0000	[diff] [blame]	139	<ul>
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	140	<li>With the distributed files (or use <a href="#checkout">CVS</a>):
John Criswell	9e2485c	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	9e2485c	2004-12-10 15:51:16 +0000	[diff] [blame]	145	</ol></li>
				146
John Criswell	9e2485c	2004-12-10 15:51:16 +0000	[diff] [blame]	147	</ul></li>
				148
				149
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	150	<li>Configure the LLVM Build Environment
				151	<ol>
Misha Brukman	9106eca	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	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	156	<ul>
Reid Spencer	d4694f9	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	9106eca	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	fef93b7	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	838bce5	2005-05-09 16:39:27 +0000	[diff] [blame]	163	C/C++ front end installation to use with this LLVM configuration. If
Reid Spencer	fef93b7	2004-12-26 05:47:26 +0000	[diff] [blame]	164	not specified, the PATH will be searched.</p></li>
Misha Brukman	00c73d2	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	95e9258	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	78ce3b8	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	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	178	</ol>
				179
				180	</ol>
				181
Chris Lattner	fcd3725	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	00c73d2	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	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	213	<table cellpadding="3" summary="Known LLVM platforms">
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	214	<tr>
				215	<th>OS</th>
				216	<th>Arch</th>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	217	<th>Compilers</th>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	218	</tr>
				219	<tr>
				220	<td>Linux</td>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	221	<td>x86<sup><a href="#pf_1">1</a></sup></td>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	222	<td>GCC</td>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	223	</tr>
				224	<tr>
				225	<td>Solaris</td>
				226	<td>V9 (Ultrasparc)</td>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	227	<td>GCC</td>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	228	</tr>
				229	<tr>
				230	<td>FreeBSD</td>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	231	<td>x86<sup><a href="#pf_1">1</a></sup></td>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	232	<td>GCC</td>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	233	</tr>
				234	<tr>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	235	<td>MacOS X<sup><a href="#pf_2">2</a></sup></td>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	236	<td>PowerPC</td>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	237	<td>GCC</td>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	238	</tr>
				239	<tr>
Tanya Lattner	993b980	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	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	246	<td>Cygwin/Win32</td>
Chris Lattner	6947e55	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	65e8f5b	2004-12-23 19:39:54 +0000	[diff] [blame]	248	<td>GCC 3.4.X, binutils 2.15</td>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	249	</tr>
Misha Brukman	c155a0a	2004-12-23 07:14:56 +0000	[diff] [blame]	250	<tr>
Chris Lattner	8ccb87f	2005-02-09 20:43:48 +0000	[diff] [blame]	251	<td>MinGW/Win32</td>
Chris Lattner	6947e55	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	8ccb87f	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	c155a0a	2004-12-23 07:14:56 +0000	[diff] [blame]	256	<td>Linux</td>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	257	<td>amd64<sup><a href="#pf_3">3</a></sup></td>
Misha Brukman	c155a0a	2004-12-23 07:14:56 +0000	[diff] [blame]	258	<td>GCC</td>
				259	</tr>
Misha Brukman	69def74	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	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	264	<table summary="LLVM partial platform support">
Misha Brukman	69def74	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	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	269	</tr>
Misha Brukman	0011769	2004-11-15 21:05:08 +0000	[diff] [blame]	270	<tr>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	271	<td>Windows</td>
Chris Lattner	7db3f52	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	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	274	<tr>
Chris Lattner	7db3f52	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	0011769	2004-11-15 21:05:08 +0000	[diff] [blame]	276	<td>PowerPC</td>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	277	<td>GCC</td>
				278	</tr>
				279	<tr>
Chris Lattner	7db3f52	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	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	281	<td>PowerPC</td>
				282	<td>GCC</td>
Misha Brukman	0011769	2004-11-15 21:05:08 +0000	[diff] [blame]	283	</tr>
John Criswell	7516255	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	e8714af	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	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	300	</table>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	301
Misha Brukman	a892ead	2005-02-09 21:01:26 +0000	[diff] [blame]	302	<p><b>Notes:</b></p>
				303
Misha Brukman	6d8e153	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	5907d40	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	a892ead	2005-02-09 21:01:26 +0000	[diff] [blame]	313	<a href="http://www.mingw.org/MinGWiki/">Download</a> and install
Chris Lattner	6947e55	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	5907d40	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	7516255	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	5907d40	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	6947e55	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	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	321	future. We highly recommend that you rebuild your current binutils with the
Chris Lattner	6947e55	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	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	323	Binutils bugzilla</a>, if it wasn't already applied.</li>
Misha Brukman	a892ead	2005-02-09 21:01:26 +0000	[diff] [blame]	324	</ol>
Misha Brukman	a892ead	2005-02-09 21:01:26 +0000	[diff] [blame]	325	</div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	326
Misha Brukman	69def74	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	8bfe6a7	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	69def74	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	00c73d2	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	22e9e33	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	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	343
				344	</div>
				345
				346	<!-- ======================================================================= -->
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	347	<div class="doc_subsection"><a name="software"><b>Software</b></a></div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	348	<div class="doc_text">
Reid Spencer	748d82e	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	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	354	<table summary="Packages required to compile LLVM">
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	355	<tr><th>Package</th><th>Version</th><th>Notes</th></tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	356
Reid Spencer	748d82e	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	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	362
Reid Spencer	748d82e	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	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	366	<td>C/C++ compiler<sup><a href="#sf1">1</a></sup></td>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	367	</tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	368
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	369	<tr>
Chris Lattner	2286cab	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	748d82e	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	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	380
Reid Spencer	748d82e	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	4896c5d	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	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	384	<td>YACC compiler</td>
				385	</tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	386
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	387	<tr>
Misha Brukman	6d8e153	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	748d82e	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	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	396	<td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	397	</tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	398
Reid Spencer	748d82e	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	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	402	<td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	403	</tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	404
Reid Spencer	748d82e	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	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	408	<td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer	748d82e	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	200d93b	2004-12-09 17:55:37 +0000	[diff] [blame]	413	<td>≥5.6.0</td>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	414	<td>Nightly tester, utilities</td>
				415	</tr>
				416
				417	<tr>
Misha Brukman	6d8e153	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	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	421	</tr>
				422
				423	<tr>
Misha Brukman	6d8e153	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	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	439	</tr>
				440
				441	</table>
				442
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	443	<p><b>Notes:</b></p>
				444	<div class="doc_notes">
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	445	<ol>
Chris Lattner	9abd8af	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	6d8e153	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	748d82e	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	200d93b	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	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	458	</ol>
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	459	</div>
				460
Reid Spencer	748d82e	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	c4ef3f2	2004-12-08 16:55:27 +0000	[diff] [blame]	468	<li><b>cat</b> - output concatenation utility</li>
Reid Spencer	748d82e	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	616bd05	2004-11-20 01:27:40 +0000	[diff] [blame]	482	<li><b>rm</b> - remove (delete) files and directories</li>
Reid Spencer	748d82e	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	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	490	</div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	491
Chris Lattner	95e9258	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	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	496
Chris Lattner	95e9258	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	6557f18	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
Chris Lattner	36117ac	2007-05-10 06:42:21 +0000	[diff] [blame]	502	successfully with them (however, see important notes below). Other versions
				503	of GCC will probably work as well. GCC versions listed
Chris Lattner	95e9258	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	294ba02	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	95e9258	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	25e7b16	2005-02-12 20:11:13 +0000	[diff] [blame]	520
Chris Lattner	8e64f15	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	3213a3a	2007-05-10 05:37:14 +0000	[diff] [blame]	528	<p><b>GCC 3.4.0</b> on linux/x86 (32-bit)</b>: GCC miscompiles portions of the
Chris Lattner	36117ac	2007-05-10 06:42:21 +0000	[diff] [blame]	529	code generator, causing an infinite loop in the llvm-gcc build when built
				530	with optimizations enabled (i.e. a release build).</p>
				531	<p><b>GCC 3.4.2</b> on linux/x86 (32-bit)</b>: GCC miscompiles portions of the
				532	code generator at -O3, as with 3.4.0. However gcc 3.4.2 (unlike 3.4.0)
				533	correctly compiles LLVM at -O2. A work around is to build release LLVM
				534	builds with "make ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O2 ..."</p>
Chris Lattner	77c2af6	2007-04-01 20:14:46 +0000	[diff] [blame]	535	<p><b>GCC 3.4.x</b> on X86-64/amd64</b>: GCC <a href="http://llvm.org/PR1056">
				536	miscompiles portions of LLVM</a>.</p>
Chris Lattner	f2b5e6e	2005-05-15 22:26:45 +0000	[diff] [blame]	537	<p><b>IA-64 GCC 4.0.0</b>: The IA-64 version of GCC 4.0.0 is known to
				538	miscompile LLVM.</p>
Chris Lattner	dd19791	2006-06-16 19:53:39 +0000	[diff] [blame]	539	<p><b>Apple Xcode 2.3</b>: GCC crashes when compiling LLVM at -O3 (which is the
				540	default with ENABLE_OPTIMIZED=1. To work around this, build with
				541	"ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O2".</p>
Chris Lattner	c40eb5e	2006-09-07 17:34:27 +0000	[diff] [blame]	542	<p><b>GCC 4.1.1</b>: GCC fails to build LLVM with template concept check errors
				543	compiling some files. At the time of this writing, GCC mainline (4.2)
				544	did not share the problem.</p>
Chris Lattner	78ce3b8	2007-01-04 07:06:05 +0000	[diff] [blame]	545	<p><b>GCC 4.1.1 on X86-64/amd64</b>: GCC <a href="http://llvm.org/PR1063">
				546	miscompiles portions of LLVM</a> when compiling llvm itself into 64-bit
				547	code. LLVM will appear to mostly work but will be buggy, e.g. failing
				548	portions of its testsuite.</p>
Reid Spencer	72f92f0	2007-04-11 21:28:31 +0000	[diff] [blame]	549	<p><b>GCC 4.1.2 on OpenSUSE</b>: Seg faults during libstdc++ build and on x86_64
				550	platforms compiling md5.c gets a mangled constant.</p>
Reid Spencer	7a11908	2006-11-04 00:33:42 +0000	[diff] [blame]	551	<p><b>GNU ld 2.16.X</b>. Some 2.16.X versions of the ld linker will produce very
				552	long warning messages complaining that some ".gnu.linkonce.t.*" symbol was
				553	defined in a discarded section. You can safely ignore these messages as they are
				554	erroneous and the linkage is correct. These messages disappear using ld
				555	2.17.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	556	</div>
				557
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	558
				559
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	560	<!-- *********************************************************************** -->
				561	<div class="doc_section">
				562	<a name="starting"><b>Getting Started with LLVM</b></a>
				563	</div>
				564	<!-- *********************************************************************** -->
				565
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	566	<div class="doc_text">
				567
				568	<p>The remainder of this guide is meant to get you up and running with
				569	LLVM and to give you some basic information about the LLVM environment.</p>
				570
				571	<p>The later sections of this guide describe the <a
				572	href="#layout">general layout</a> of the the LLVM source tree, a <a
				573	href="#tutorial">simple example</a> using the LLVM tool chain, and <a
				574	href="#links">links</a> to find more information about LLVM or to get
				575	help via e-mail.</p>
				576	</div>
				577
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	578	<!-- ======================================================================= -->
				579	<div class="doc_subsection">
				580	<a name="terminology">Terminology and Notation</a>
				581	</div>
				582
				583	<div class="doc_text">
				584
				585	<p>Throughout this manual, the following names are used to denote paths
				586	specific to the local system and working environment. <i>These are not
				587	environment variables you need to set but just strings used in the rest
				588	of this document below</i>. In any of the examples below, simply replace
				589	each of these names with the appropriate pathname on your local system.
				590	All these paths are absolute:</p>
				591
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	592	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	593	<dt>SRC_ROOT
				594	<dd>
				595	This is the top level directory of the LLVM source tree.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	596	<br><br>
John Criswell	0f6d7c0	2003-10-27 18:18:16 +0000	[diff] [blame]	597
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	598	<dt>OBJ_ROOT
				599	<dd>
				600	This is the top level directory of the LLVM object tree (i.e. the
				601	tree where object files and compiled programs will be placed. It
				602	can be the same as SRC_ROOT).
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	603	<br><br>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	604
				605	<dt>LLVMGCCDIR
				606	<dd>
Reid Spencer	fef93b7	2004-12-26 05:47:26 +0000	[diff] [blame]	607	This is where the LLVM GCC Front End is installed.
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	608	<p>
				609	For the pre-built GCC front end binaries, the LLVMGCCDIR is
Tanya Lattner	f7b6be0	2006-11-20 06:04:46 +0000	[diff] [blame]	610	<tt>llvm-gcc/<i>platform</i>/llvm-gcc</tt>.
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	611	</dl>
				612
				613	</div>
				614
				615	<!-- ======================================================================= -->
				616	<div class="doc_subsection">
				617	<a name="environment">Setting Up Your Environment</a>
				618	</div>
				619
				620	<div class="doc_text">
				621
				622	<p>
Misha Brukman	8f0cad1	2005-02-03 18:28:08 +0000	[diff] [blame]	623	In order to compile and use LLVM, you may need to set some environment
				624	variables.
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	625
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	626	<dl>
Reid Spencer	f96eb57	2004-12-15 00:14:01 +0000	[diff] [blame]	627	<dt><tt>LLVM_LIB_SEARCH_PATH</tt>=<tt>/path/to/your/bytecode/libs</tt></dt>
Misha Brukman	8f0cad1	2005-02-03 18:28:08 +0000	[diff] [blame]	628	<dd>[Optional] This environment variable helps LLVM linking tools find the
John Criswell	8bfe6a7	2005-05-18 19:43:33 +0000	[diff] [blame]	629	locations of your bytecode libraries. It is provided only as a
Misha Brukman	8f0cad1	2005-02-03 18:28:08 +0000	[diff] [blame]	630	convenience since you can specify the paths using the -L options of the
John Criswell	8bfe6a7	2005-05-18 19:43:33 +0000	[diff] [blame]	631	tools and the C/C++ front-end will automatically use the bytecode files
				632	installed in its
Misha Brukman	8f0cad1	2005-02-03 18:28:08 +0000	[diff] [blame]	633	<tt>lib</tt> directory.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	634	</dl>
				635
				636	</div>
				637
				638	<!-- ======================================================================= -->
				639	<div class="doc_subsection">
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	640	<a name="unpack">Unpacking the LLVM Archives</a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	641	</div>
				642
				643	<div class="doc_text">
				644
				645	<p>
				646	If you have the LLVM distribution, you will need to unpack it before you
John Criswell	d000e1d	2003-12-18 16:43:17 +0000	[diff] [blame]	647	can begin to compile it. LLVM is distributed as a set of two files: the LLVM
John Criswell	9e2485c	2004-12-10 15:51:16 +0000	[diff] [blame]	648	suite and the LLVM GCC front end compiled for your platform. There is an
				649	additional test suite that is optional. Each file is a TAR archive that is
				650	compressed with the gzip program.
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	651	</p>
				652
Misha Brukman	3ce1103	2005-02-02 18:01:57 +0000	[diff] [blame]	653	<p>The files are as follows, with <em>x.y</em> marking the version number:
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	654	<dl>
Misha Brukman	3ce1103	2005-02-02 18:01:57 +0000	[diff] [blame]	655	<dt><tt>llvm-x.y.tar.gz</tt></dt>
				656	<dd>Source release for the LLVM libraries and tools.<br/></dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	657
Misha Brukman	3ce1103	2005-02-02 18:01:57 +0000	[diff] [blame]	658	<dt><tt>llvm-test-x.y.tar.gz</tt></dt>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	659	<dd>Source release for the LLVM test suite.</dd>
Misha Brukman	8f9e6d6	2004-11-23 19:26:24 +0000	[diff] [blame]	660
Chris Lattner	1ef81af	2006-04-20 05:08:23 +0000	[diff] [blame]	661	<dt><tt>llvm-gcc4-x.y.source.tar.gz</tt></dt>
				662	<dd>Source release of the llvm-gcc4 front end. See README.LLVM in the root
				663	directory for build instructions.<br/></dd>
				664
Tanya Lattner	f7b6be0	2006-11-20 06:04:46 +0000	[diff] [blame]	665	<dt><tt>llvm-gcc4-x.y-platform.tar.gz</tt></dt>
				666	<dd>Binary release of the llvm-gcc4 front end for a specific platform.<br/></dd>
Chris Lattner	1ef81af	2006-04-20 05:08:23 +0000	[diff] [blame]	667
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	668	</dl>
				669
Jim Laskey	6c3acb7	2006-07-31 21:37:55 +0000	[diff] [blame]	670	<p>It is also possible to download the sources of the llvm-gcc4 front end from a
				671	read-only subversion mirror at
				672	svn://anonsvn.opensource.apple.com/svn/llvm/trunk. </p>
Jim Laskey	3261f0b	2006-06-16 23:20:21 +0000	[diff] [blame]	673
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	674	</div>
				675
				676	<!-- ======================================================================= -->
				677	<div class="doc_subsection">
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	678	<a name="checkout">Checkout LLVM from CVS</a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	679	</div>
				680
				681	<div class="doc_text">
				682
				683	<p>If you have access to our CVS repository, you can get a fresh copy of
				684	the entire source code. All you need to do is check it out from CVS as
				685	follows:</p>
				686
				687	<ul>
				688	<li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
Chris Lattner	c75a04b	2006-08-03 22:14:43 +0000	[diff] [blame]	689	<li><tt>cvs -d :pserver:anon@llvm.org:/var/cvs/llvm login</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	690	<li>Hit the return key when prompted for the password.
Chris Lattner	c75a04b	2006-08-03 22:14:43 +0000	[diff] [blame]	691	<li><tt>cvs -z3 -d :pserver:anon@llvm.org:/var/cvs/llvm co
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	692	llvm</tt>
				693	</ul>
				694
				695	<p>This will create an '<tt>llvm</tt>' directory in the current
				696	directory and fully populate it with the LLVM source code, Makefiles,
				697	test directories, and local copies of documentation files.</p>
				698
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	699	<p>If you want to get a specific release (as opposed to the most recent
				700	revision), you can specify a label. The following releases have the following
Misha Brukman	3ce1103	2005-02-02 18:01:57 +0000	[diff] [blame]	701	labels:</p>
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	702
John Criswell	d000e1d	2003-12-18 16:43:17 +0000	[diff] [blame]	703	<ul>
Tanya Lattner	1dcadec	2007-05-22 06:06:22 +0000	[diff] [blame]	704	<li>Release 2.0: <b>RELEASE_20</b></li>
Tanya Lattner	134693a	2006-11-20 06:07:10 +0000	[diff] [blame]	705	<li>Release 1.9: <b>RELEASE_19</b></li>
Tanya Lattner	f7b6be0	2006-11-20 06:04:46 +0000	[diff] [blame]	706	<li>Release 1.8: <b>RELEASE_18</b></li>
Tanya Lattner	993b980	2006-04-20 04:35:34 +0000	[diff] [blame]	707	<li>Release 1.7: <b>RELEASE_17</b></li>
John Criswell	c0c186d	2005-11-08 21:11:33 +0000	[diff] [blame]	708	<li>Release 1.6: <b>RELEASE_16</b></li>
John Criswell	7516255	2005-05-09 16:49:59 +0000	[diff] [blame]	709	<li>Release 1.5: <b>RELEASE_15</b></li>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	710	<li>Release 1.4: <b>RELEASE_14</b></li>
John Criswell	18b7464	2004-08-16 14:51:33 +0000	[diff] [blame]	711	<li>Release 1.3: <b>RELEASE_13</b></li>
Misha Brukman	b9be2bf	2004-05-12 19:25:59 +0000	[diff] [blame]	712	<li>Release 1.2: <b>RELEASE_12</b></li>
				713	<li>Release 1.1: <b>RELEASE_11</b></li>
				714	<li>Release 1.0: <b>RELEASE_1</b></li>
John Criswell	d000e1d	2003-12-18 16:43:17 +0000	[diff] [blame]	715	</ul>
John Criswell	d000e1d	2003-12-18 16:43:17 +0000	[diff] [blame]	716
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	717	<p>If you would like to get the LLVM test suite (a separate package as of 1.4),
				718	you get it from the CVS repository:</p>
				719	<pre>
				720	cd llvm/projects
Chris Lattner	c75a04b	2006-08-03 22:14:43 +0000	[diff] [blame]	721	cvs -z3 -d :pserver:anon@llvm.org:/var/cvs/llvm co llvm-test
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	722	</pre>
				723	<p>By placing it in the <tt>llvm/projects</tt>, it will be automatically
John Criswell	c4ef3f2	2004-12-08 16:55:27 +0000	[diff] [blame]	724	configured by the LLVM configure script as well as automatically updated when
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	725	you run <tt>cvs update</tt>.</p>
				726
Chris Lattner	82ad9f1	2007-03-06 06:27:34 +0000	[diff] [blame]	727	<p>If you would like to get the GCC front end source code, you can also get it
				728	and build it yourself. Please follow <a href="CFEBuildInstrs.html">these
				729	instructions</a> to successfully get and build the LLVM GCC front-end.</p>
Chris Lattner	604fdc1	2004-06-28 17:14:01 +0000	[diff] [blame]	730
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	731	</div>
				732
				733	<!-- ======================================================================= -->
				734	<div class="doc_subsection">
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	735	<a name="installcf">Install the GCC Front End</a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	736	</div>
				737
				738	<div class="doc_text">
				739
Chris Lattner	bcb38cf	2007-02-14 07:33:00 +0000	[diff] [blame]	740	<p>Before configuring and compiling the LLVM suite, you can optionally extract the
				741	LLVM GCC front end from the binary distribution. It is used for running the
				742	llvm-test testsuite and for compiling C/C++ programs. Note that you can optionally
				743	<a href="CFEBuildInstrs.html">build llvm-gcc yourself</a> after building the
				744	main LLVM repository.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	745
				746	<p>To install the GCC front end, do the following:</p>
				747
				748	<ol>
				749	<li><tt>cd <i>where-you-want-the-front-end-to-live</i></tt></li>
Tanya Lattner	f7b6be0	2006-11-20 06:04:46 +0000	[diff] [blame]	750	<li><tt>gunzip --stdout llvmgcc-<i>version</i>.<i>platform</i>.tar.gz \| tar -xvf
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	751	-</tt></li>
				752	</ol>
				753
Chris Lattner	bcb38cf	2007-02-14 07:33:00 +0000	[diff] [blame]	754	<p>Once the binary is uncompressed, you should add a symlink for llvm-gcc and
				755	llvm-g++ to some directory in your path. When you configure LLVM, it will
				756	automatically detect llvm-gcc's presence (if it is in your path) enabling its
				757	use in llvm-test. Note that you can always build or install llvm-gcc at any
				758	pointer after building the main LLVM repository: just reconfigure llvm and
				759	llvm-test will pick it up.
				760	</p>
				761
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	762	<p>The binary versions of the GCC front end may not suit all of your needs. For
				763	example, the binary distribution may include an old version of a system header
				764	file, not "fix" a header file that needs to be fixed for GCC, or it may be
				765	linked with libraries not available on your system.</p>
				766
				767	<p>In cases like these, you may want to try <a
				768	href="CFEBuildInstrs.html">building the GCC front end from source.</a> This is
Chris Lattner	f76e7bb	2007-02-14 07:34:22 +0000	[diff] [blame]	769	much easier now than it was in the past.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	770
				771	</div>
				772
				773	<!-- ======================================================================= -->
				774	<div class="doc_subsection">
				775	<a name="config">Local LLVM Configuration</a>
				776	</div>
				777
				778	<div class="doc_text">
				779
				780	<p>Once checked out from the CVS repository, the LLVM suite source code must be
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	781	configured via the <tt>configure</tt> script. This script sets variables in the
				782	various <tt>*.in</tt> files, most notably <tt>llvm/Makefile.config</tt> and
				783	<tt>llvm/include/Config/config.h</tt>. It also populates <i>OBJ_ROOT</i> with
				784	the Makefiles needed to begin building LLVM.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	785
				786	<p>The following environment variables are used by the <tt>configure</tt>
				787	script to configure the build system:</p>
				788
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	789	<table summary="LLVM configure script environment variables">
Reid Spencer	d3f876c	2004-11-01 08:19:36 +0000	[diff] [blame]	790	<tr><th>Variable</th><th>Purpose</th></tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	791	<tr>
				792	<td>CC</td>
				793	<td>Tells <tt>configure</tt> which C compiler to use. By default,
				794	<tt>configure</tt> will look for the first GCC C compiler in
				795	<tt>PATH</tt>. Use this variable to override
				796	<tt>configure</tt>'s default behavior.</td>
				797	</tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	798	<tr>
				799	<td>CXX</td>
				800	<td>Tells <tt>configure</tt> which C++ compiler to use. By default,
				801	<tt>configure</tt> will look for the first GCC C++ compiler in
				802	<tt>PATH</tt>. Use this variable to override
				803	<tt>configure</tt>'s default behavior.</td>
				804	</tr>
				805	</table>
				806
				807	<p>The following options can be used to set or enable LLVM specific options:</p>
				808
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	809	<dl>
Reid Spencer	fef93b7	2004-12-26 05:47:26 +0000	[diff] [blame]	810	<dt><i>--with-llvmgccdir</i></dt>
				811	<dd>Path to the LLVM C/C++ FrontEnd to be used with this LLVM configuration.
				812	The value of this option should specify the full pathname of the C/C++ Front
				813	End to be used. If this option is not provided, the PATH will be searched for
				814	a program named <i>llvm-gcc</i> and the C/C++ FrontEnd install directory will
				815	be inferred from the path found. If the option is not given, and no llvm-gcc
				816	can be found in the path then a warning will be produced by
				817	<tt>configure</tt> indicating this situation. LLVM may still be built with
				818	the <tt>tools-only</tt> target but attempting to build the runtime libraries
				819	will fail as these libraries require llvm-gcc and llvm-g++. See
				820	<a href="#installcf">Install the GCC Front End</a> for details on installing
				821	the C/C++ Front End. See
				822	<a href="CFEBuildInstrs.html">Bootstrapping the LLVM C/C++ Front-End</a>
				823	for details on building the C/C++ Front End.</dd>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	824	<dt><i>--with-tclinclude</i></dt>
John Criswell	8bfe6a7	2005-05-18 19:43:33 +0000	[diff] [blame]	825	<dd>Path to the tcl include directory under which <tt>tclsh</tt> can be
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	826	found. Use this if you have multiple tcl installations on your machine and you
				827	want to use a specific one (8.x) for LLVM. LLVM only uses tcl for running the
				828	dejagnu based test suite in <tt>llvm/test</tt>. If you don't specify this
John Criswell	8bfe6a7	2005-05-18 19:43:33 +0000	[diff] [blame]	829	option, the LLVM configure script will search for the tcl 8.4 and 8.3
				830	releases.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	831	<br><br>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	832	</dd>
				833	<dt><i>--enable-optimized</i></dt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	834	<dd>
				835	Enables optimized compilation by default (debugging symbols are removed
				836	and GCC optimization flags are enabled). The default is to use an
				837	unoptimized build (also known as a debug build).
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	838	<br><br>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	839	</dd>
Reid Spencer	9d57b4d	2005-12-21 03:46:45 +0000	[diff] [blame]	840	<dt><i>--enable-debug-runtime</i></dt>
				841	<dd>
				842	Enables debug symbols in the runtime libraries. The default is to strip
				843	debug symbols from the runtime libraries.
				844	</dd>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	845	<dt><i>--enable-jit</i></dt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	846	<dd>
John Criswell	d000e1d	2003-12-18 16:43:17 +0000	[diff] [blame]	847	Compile the Just In Time (JIT) compiler functionality. This is not
				848	available
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	849	on all platforms. The default is dependent on platform, so it is best
				850	to explicitly enable it if you want it.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	851	<br><br>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	852	</dd>
Reid Spencer	2dedcf5	2005-04-22 17:58:03 +0000	[diff] [blame]	853	<dt><i>--enable-targets=</i><tt>target-option</tt></dt>
				854	<dd>Controls which targets will be built and linked into llc. The default
				855	value for <tt>target_options</tt> is "all" which builds and links all
				856	available targets. The value "host-only" can be specified to build only a
				857	native compiler (no cross-compiler targets available). The "native" target is
				858	selected as the target of the build host. You can also specify a comma
				859	separated list of target names that you want available in llc. The target
John Criswell	8bfe6a7	2005-05-18 19:43:33 +0000	[diff] [blame]	860	names use all lower case. The current set of targets is: <br/>
Reid Spencer	2dedcf5	2005-04-22 17:58:03 +0000	[diff] [blame]	861	<tt>alpha, ia64, powerpc, skeleton, sparc, x86</tt>.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	862	<br><br></dd>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	863	<dt><i>--enable-doxygen</i></dt>
				864	<dd>Look for the doxygen program and enable construction of doxygen based
				865	documentation from the source code. This is disabled by default because
				866	generating the documentation can take a long time and producess 100s of
				867	megabytes of output.</dd>
Anton Korobeynikov	8cea37b	2007-01-23 12:35:46 +0000	[diff] [blame]	868	<dt><i>--with-udis86</i></dt>
				869	<dd>LLVM can use external disassembler library for various purposes (now it's
				870	used only for examining code produced by JIT). This option will enable usage
				871	of <a href="http://udis86.sourceforge.net/">udis86</a> x86 (both 32 and 64
				872	bits) disassembler library.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	873	</dl>
				874
				875	<p>To configure LLVM, follow these steps:</p>
				876
				877	<ol>
				878	<li>Change directory into the object root directory:
John Criswell	0f6d7c0	2003-10-27 18:18:16 +0000	[diff] [blame]	879	<br>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	880	<tt>cd <i>OBJ_ROOT</i></tt>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	881	<br><br>
John Criswell	0f6d7c0	2003-10-27 18:18:16 +0000	[diff] [blame]	882
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	883	<li>Run the <tt>configure</tt> script located in the LLVM source tree:
				884	<br>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	885	<tt><i>SRC_ROOT</i>/configure --prefix=/install/path [other options]</tt>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	886	<br><br>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	887	</ol>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	888
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	889	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	890
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	891	<!-- ======================================================================= -->
				892	<div class="doc_subsection">
				893	<a name="compile">Compiling the LLVM Suite Source Code</a>
				894	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	895
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	896	<div class="doc_text">
John Criswell	0b45920	2003-07-08 20:35:59 +0000	[diff] [blame]	897
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	898	<p>Once you have configured LLVM, you can build it. There are three types of
				899	builds:</p>
John Criswell	0b45920	2003-07-08 20:35:59 +0000	[diff] [blame]	900
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	901	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	902	<dt>Debug Builds
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	903	<dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	904	These builds are the default when one types <tt>gmake</tt> (unless the
				905	<tt>--enable-optimized</tt> option was used during configuration). The
				906	build system will compile the tools and libraries with debugging
				907	information.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	908	<br><br>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	909
				910	<dt>Release (Optimized) Builds
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	911	<dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	912	These builds are enabled with the <tt>--enable-optimized</tt> option to
				913	<tt>configure</tt> or by specifying <tt>ENABLE_OPTIMIZED=1</tt> on the
				914	<tt>gmake</tt> command line. For these builds, the build system will
				915	compile the tools and libraries with GCC optimizations enabled and strip
				916	debugging information from the libraries and executables it generates.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	917	<br><br>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	918
				919	<dt>Profile Builds
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	920	<dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	921	These builds are for use with profiling. They compile profiling
				922	information into the code for use with programs like <tt>gprof</tt>.
				923	Profile builds must be started by specifying <tt>ENABLE_PROFILING=1</tt>
				924	on the <tt>gmake</tt> command line.
				925	</dl>
John Criswell	7a73b80	2003-06-30 21:59:07 +0000	[diff] [blame]	926
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	927	<p>Once you have LLVM configured, you can build it by entering the
				928	<i>OBJ_ROOT</i> directory and issuing the following command:</p>
John Criswell	20d2d3e	2003-10-10 14:26:14 +0000	[diff] [blame]	929
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	930	<p><tt>gmake</tt></p>
John Criswell	20d2d3e	2003-10-10 14:26:14 +0000	[diff] [blame]	931
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	932	<p>If the build fails, please <a href="#brokengcc">check here</a> to see if you
John Criswell	3d8ba51	2004-12-08 17:53:54 +0000	[diff] [blame]	933	are using a version of GCC that is known not to compile LLVM.</p>
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	934
				935	<p>
				936	If you have multiple processors in your machine, you may wish to use some of
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	937	the parallel build options provided by GNU Make. For example, you could use the
				938	command:</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	939
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	940	<p><tt>gmake -j2</tt></p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	941
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	942	<p>There are several special targets which are useful when working with the LLVM
				943	source code:</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	944
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	945	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	946	<dt><tt>gmake clean</tt>
				947	<dd>
				948	Removes all files generated by the build. This includes object files,
				949	generated C/C++ files, libraries, and executables.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	950	<br><br>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	951
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	952	<dt><tt>gmake dist-clean</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	953	<dd>
Misha Brukman	ad38e96	2004-08-21 23:40:49 +0000	[diff] [blame]	954	Removes everything that <tt>gmake clean</tt> does, but also removes files
				955	generated by <tt>configure</tt>. It attempts to return the source tree to the
				956	original state in which it was shipped.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	957	<br><br>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	958
Misha Brukman	e51c356	2004-08-23 20:25:33 +0000	[diff] [blame]	959	<dt><tt>gmake install</tt>
				960	<dd>
John Criswell	3d8ba51	2004-12-08 17:53:54 +0000	[diff] [blame]	961	Installs LLVM header files, libraries, tools, and documentation in a
				962	hierarchy
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	963	under $PREFIX, specified with <tt>./configure --prefix=[dir]</tt>, which
				964	defaults to <tt>/usr/local</tt>.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	965	<br><br>
				966
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	967	<dt><tt>gmake -C runtime install-bytecode</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	968	<dd>
Reid Spencer	7863c40	2004-11-11 07:30:27 +0000	[diff] [blame]	969	Assuming you built LLVM into $OBJDIR, when this command is run, it will
				970	install bytecode libraries into the GCC front end's bytecode library
				971	directory. If you need to update your bytecode libraries,
Misha Brukman	ad38e96	2004-08-21 23:40:49 +0000	[diff] [blame]	972	this is the target to use once you've built them.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	973	<br><br>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	974	</dl>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	975
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	976	<p>Please see the <a href="MakefileGuide.html">Makefile Guide</a> for further
				977	details on these <tt>make</tt> targets and descriptions of other targets
				978	available.</p>
				979
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	980	<p>It is also possible to override default values from <tt>configure</tt> by
				981	declaring variables on the command line. The following are some examples:</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	982
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	983	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	984	<dt><tt>gmake ENABLE_OPTIMIZED=1</tt>
				985	<dd>
				986	Perform a Release (Optimized) build.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	987	<br><br>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	988
Reid Spencer	004ba03	2006-04-09 23:45:38 +0000	[diff] [blame]	989	<dt><tt>gmake ENABLE_OPTIMIZED=1 DISABLE_ASSERTIONS=1</tt>
Chris Lattner	d465126	2006-03-21 01:10:57 +0000	[diff] [blame]	990	<dd>
Reid Spencer	004ba03	2006-04-09 23:45:38 +0000	[diff] [blame]	991	Perform a Release (Optimized) build without assertions enabled.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	992	<br><br>
Chris Lattner	d465126	2006-03-21 01:10:57 +0000	[diff] [blame]	993
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	994	<dt><tt>gmake ENABLE_PROFILING=1</tt>
				995	<dd>
				996	Perform a Profiling build.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	997	<br><br>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	998
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	999	<dt><tt>gmake VERBOSE=1</tt>
				1000	<dd>
				1001	Print what <tt>gmake</tt> is doing on standard output.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1002	<br><br>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1003
				1004	<dt><tt>gmake TOOL_VERBOSE=1</tt></dt>
				1005	<dd>Ask each tool invoked by the makefiles to print out what it is doing on
John Criswell	3d8ba51	2004-12-08 17:53:54 +0000	[diff] [blame]	1006	the standard output. This also implies <tt>VERBOSE=1</tt>.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1007	<br><br></dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1008	</dl>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1009
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1010	<p>Every directory in the LLVM object tree includes a <tt>Makefile</tt> to build
				1011	it and any subdirectories that it contains. Entering any directory inside the
				1012	LLVM object tree and typing <tt>gmake</tt> should rebuild anything in or below
				1013	that directory that is out of date.</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1014
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1015	</div>
John Criswell	20d2d3e	2003-10-10 14:26:14 +0000	[diff] [blame]	1016
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1017	<!-- ======================================================================= -->
				1018	<div class="doc_subsection">
Reid Spencer	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	1019	<a name="cross-compile">Cross-Compiling LLVM</a>
Reid Spencer	17850ef	2006-07-27 05:43:30 +0000	[diff] [blame]	1020	</div>
				1021
				1022	<div class="doc_text">
Reid Spencer	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	1023	<p>It is possible to cross-compile LLVM. That is, you can create LLVM
				1024	executables and libraries for a platform different than the one one which you
				1025	are compiling. To do this, a few additional steps are
				1026	required. <sup><a href="#ccn_1">1</a></sup> To cross-compile LLVM, use
Reid Spencer	17850ef	2006-07-27 05:43:30 +0000	[diff] [blame]	1027	these instructions:</p>
				1028	<ol>
Reid Spencer	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	1029	<li>Configure and build LLVM as a native compiler. You will need
Reid Spencer	17850ef	2006-07-27 05:43:30 +0000	[diff] [blame]	1030	just <tt>TableGen</tt> from that build.
				1031	<ul>
				1032	<li>If you have <tt>$LLVM_OBJ_ROOT=$LLVM_SRC_ROOT</tt> just execute
				1033	<tt>make -C utils/TableGen</tt> after configuring.</li>
				1034	<li>Otherwise you will need to monitor building process and terminate
				1035	it just after <tt>TableGen</tt> was built.</li>
				1036	</ul>
				1037	</li>
				1038	<li>Copy the TableGen binary to somewhere safe (out of your build tree).
				1039	</li>
Reid Spencer	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	1040	<li>Configure LLVM to build with a cross-compiler. To do this, supply the
Reid Spencer	17850ef	2006-07-27 05:43:30 +0000	[diff] [blame]	1041	configure script with <tt>--build</tt> and <tt>--host</tt> options that
Reid Spencer	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	1042	are different. The values of these options must be legal target triples
				1043	that your GCC compiler supports.</li>
Reid Spencer	17850ef	2006-07-27 05:43:30 +0000	[diff] [blame]	1044	<li>Put the saved <tt>TableGen</tt> executable into the
				1045	into <tt>$LLVM_OBJ_ROOT/{BUILD_TYPE}/bin</tt> directory (e.g. into
				1046	<tt>.../Release/bin</tt> for a Release build).</li>
				1047	<li>Build LLVM as usual.</li>
				1048	</ol>
Reid Spencer	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	1049	<p>The result of such a build will produce executables that are not executable
				1050	on your build host (--build option) but can be executed on your compile host
				1051	(--host option).</p>
Reid Spencer	17850ef	2006-07-27 05:43:30 +0000	[diff] [blame]	1052	<p><b>Notes:</b></p>
				1053	<div class="doc_notes">
				1054	<ol>
				1055	<li><a name="ccn_1">Cross-compiling</a> was tested only with Linux as
				1056	build platform and Windows as host using mingw32 cross-compiler. Other
				1057	combinations have not been tested.</li>
				1058	</ol>
				1059	</div>
				1060	</div>
				1061
				1062	<!-- ======================================================================= -->
				1063	<div class="doc_subsection">
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1064	<a name="objfiles">The Location of LLVM Object Files</a>
				1065	</div>
John Criswell	20d2d3e	2003-10-10 14:26:14 +0000	[diff] [blame]	1066
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1067	<div class="doc_text">
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1068
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1069	<p>The LLVM build system is capable of sharing a single LLVM source tree among
				1070	several LLVM builds. Hence, it is possible to build LLVM for several different
				1071	platforms or configurations using the same source tree.</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1072
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1073	<p>This is accomplished in the typical autoconf manner:</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1074
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1075	<ul>
				1076	<li><p>Change directory to where the LLVM object files should live:</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1077
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1078	<p><tt>cd <i>OBJ_ROOT</i></tt></p></li>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1079
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1080	<li><p>Run the <tt>configure</tt> script found in the LLVM source
				1081	directory:</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1082
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1083	<p><tt><i>SRC_ROOT</i>/configure</tt></p></li>
				1084	</ul>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1085
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1086	<p>The LLVM build will place files underneath <i>OBJ_ROOT</i> in directories
				1087	named after the build type:</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1088
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1089	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1090	<dt>Debug Builds
				1091	<dd>
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1092	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1093	<dt>Tools
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1094	<dd><tt><i>OBJ_ROOT</i>/Debug/bin</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1095	<dt>Libraries
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1096	<dd><tt><i>OBJ_ROOT</i>/Debug/lib</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1097	</dl>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1098	<br><br>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1099
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1100	<dt>Release Builds
				1101	<dd>
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1102	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1103	<dt>Tools
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1104	<dd><tt><i>OBJ_ROOT</i>/Release/bin</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1105	<dt>Libraries
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1106	<dd><tt><i>OBJ_ROOT</i>/Release/lib</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1107	</dl>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1108	<br><br>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1109
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1110	<dt>Profile Builds
				1111	<dd>
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1112	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1113	<dt>Tools
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1114	<dd><tt><i>OBJ_ROOT</i>/Profile/bin</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1115	<dt>Libraries
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1116	<dd><tt><i>OBJ_ROOT</i>/Profile/lib</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1117	</dl>
				1118	</dl>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1119
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1120	</div>
Chris Lattner	7fe7f81	2002-07-24 19:51:14 +0000	[diff] [blame]	1121
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	1122	<!-- ======================================================================= -->
				1123	<div class="doc_subsection">
				1124	<a name="optionalconfig">Optional Configuration Items</a>
				1125	</div>
				1126
				1127	<div class="doc_text">
				1128
				1129	<p>
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	1130	If you're running on a Linux system that supports the "<a
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1131	href="http://www.tat.physik.uni-tuebingen.de/~rguenth/linux/binfmt_misc.html">
				1132	binfmt_misc</a>"
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	1133	module, and you have root access on the system, you can set your system up to
				1134	execute LLVM bytecode files directly. To do this, use commands like this (the
				1135	first command may not be required if you are already using the module):</p>
				1136
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	1137	<div class="doc_code">
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	1138	<pre>
				1139	$ mount -t binfmt_misc none /proc/sys/fs/binfmt_misc
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	1140	$ echo ':llvm:M::llvm::/path/to/lli:' > /proc/sys/fs/binfmt_misc/register
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	1141	$ chmod u+x hello.bc (if needed)
				1142	$ ./hello.bc
				1143	</pre>
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	1144	</div>
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	1145
				1146	<p>
				1147	This allows you to execute LLVM bytecode files directly. Thanks to Jack
				1148	Cummings for pointing this out!
				1149	</p>
				1150
				1151	</div>
				1152
				1153
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1154	<!-- *********************************************************************** -->
				1155	<div class="doc_section">
				1156	<a name="layout"><b>Program Layout</b></a>
				1157	</div>
				1158	<!-- *********************************************************************** -->
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1159
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1160	<div class="doc_text">
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1161
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1162	<p>One useful source of information about the LLVM source base is the LLVM <a
John Criswell	364cec4	2004-03-12 20:31:37 +0000	[diff] [blame]	1163	href="http://www.doxygen.org">doxygen</a> documentation available at <tt><a
Reid Spencer	05fe4b0	2006-03-14 05:39:39 +0000	[diff] [blame]	1164	href="http://llvm.org/doxygen/">http://llvm.org/doxygen/</a></tt>.
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1165	The following is a brief introduction to code layout:</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1166
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1167	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1168
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1169	<!-- ======================================================================= -->
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1170	<div class="doc_subsection"><a name="cvsdir"><tt>CVS</tt> directories</a></div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1171	<div class="doc_text">
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1172	<p>Every directory checked out of CVS will contain a <tt>CVS</tt> directory; for
				1173	the most part these can just be ignored.</p>
Reid Spencer	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	1174	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1175
Reid Spencer	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	1176	<!-- ======================================================================= -->
				1177	<div class="doc_subsection"><a name="examples"><tt>llvm/examples</tt></a></div>
				1178	<div class="doc_text">
				1179	<p>This directory contains some simple examples of how to use the LLVM IR and
				1180	JIT.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1181	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1182
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1183	<!-- ======================================================================= -->
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1184	<div class="doc_subsection"><a name="include"><tt>llvm/include</tt></a></div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1185	<div class="doc_text">
				1186
				1187	<p>This directory contains public header files exported from the LLVM
				1188	library. The three main subdirectories of this directory are:</p>
				1189
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1190	<dl>
				1191	<dt><tt><b>llvm/include/llvm</b></tt></dt>
				1192	<dd>This directory contains all of the LLVM specific header files. This
				1193	directory also has subdirectories for different portions of LLVM:
				1194	<tt>Analysis</tt>, <tt>CodeGen</tt>, <tt>Target</tt>, <tt>Transforms</tt>,
				1195	etc...</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1196
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1197	<dt><tt><b>llvm/include/llvm/Support</b></tt></dt>
				1198	<dd>This directory contains generic support libraries that are provided with
				1199	LLVM but not necessarily specific to LLVM. For example, some C++ STL utilities
				1200	and a Command Line option processing library store their header files here.
				1201	</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1202
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1203	<dt><tt><b>llvm/include/llvm/Config</b></tt></dt>
				1204	<dd>This directory contains header files configured by the <tt>configure</tt>
				1205	script. They wrap "standard" UNIX and C header files. Source code can
				1206	include these header files which automatically take care of the conditional
				1207	#includes that the <tt>configure</tt> script generates.</dd>
				1208	</dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1209	</div>
				1210
				1211	<!-- ======================================================================= -->
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1212	<div class="doc_subsection"><a name="lib"><tt>llvm/lib</tt></a></div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1213	<div class="doc_text">
				1214
				1215	<p>This directory contains most of the source files of the LLVM system. In LLVM,
				1216	almost all code exists in libraries, making it very easy to share code among the
				1217	different <a href="#tools">tools</a>.</p>
				1218
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1219	<dl>
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1220	<dt><tt><b>llvm/lib/VMCore/</b></tt></dt>
				1221	<dd> This directory holds the core LLVM source files that implement core
				1222	classes like Instruction and BasicBlock.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1223
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1224	<dt><tt><b>llvm/lib/AsmParser/</b></tt></dt>
				1225	<dd>This directory holds the source code for the LLVM assembly language parser
				1226	library.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1227
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1228	<dt><tt><b>llvm/lib/ByteCode/</b></tt></dt>
				1229	<dd>This directory holds code for reading and write LLVM bytecode.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1230
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1231	<dt><tt><b>llvm/lib/Analysis/</b></tt><dd>This directory contains a variety of
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1232	different program analyses, such as Dominator Information, Call Graphs,
				1233	Induction Variables, Interval Identification, Natural Loop Identification,
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1234	etc.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1235
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1236	<dt><tt><b>llvm/lib/Transforms/</b></tt></dt>
				1237	<dd> This directory contains the source code for the LLVM to LLVM program
				1238	transformations, such as Aggressive Dead Code Elimination, Sparse Conditional
				1239	Constant Propagation, Inlining, Loop Invariant Code Motion, Dead Global
				1240	Elimination, and many others.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1241
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1242	<dt><tt><b>llvm/lib/Target/</b></tt></dt>
				1243	<dd> This directory contains files that describe various target architectures
Chris Lattner	2a60703	2006-04-20 17:42:23 +0000	[diff] [blame]	1244	for code generation. For example, the <tt>llvm/lib/Target/X86</tt>
				1245	directory holds the X86 machine description while
John Criswell	8bfe6a7	2005-05-18 19:43:33 +0000	[diff] [blame]	1246	<tt>llvm/lib/Target/CBackend</tt> implements the LLVM-to-C converter.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1247
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1248	<dt><tt><b>llvm/lib/CodeGen/</b></tt></dt>
				1249	<dd> This directory contains the major parts of the code generator: Instruction
				1250	Selector, Instruction Scheduling, and Register Allocation.</dd>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1251
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1252	<dt><tt><b>llvm/lib/Debugger/</b></tt></dt>
				1253	<dd> This directory contains the source level debugger library that makes
				1254	it possible to instrument LLVM programs so that a debugger could identify
				1255	source code locations at which the program is executing.</dd>
				1256
				1257	<dt><tt><b>llvm/lib/ExecutionEngine/</b></tt></dt>
				1258	<dd> This directory contains libraries for executing LLVM bytecode directly
				1259	at runtime in both interpreted and JIT compiled fashions.</dd>
				1260
				1261	<dt><tt><b>llvm/lib/Support/</b></tt></dt>
				1262	<dd> This directory contains the source code that corresponds to the header
				1263	files located in <tt>llvm/include/Support/</tt>.</dd>
				1264
				1265	<dt><tt><b>llvm/lib/System/</b></tt></dt>
				1266	<dd>This directory contains the operating system abstraction layer that
				1267	shields LLVM from platform-specific coding.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1268	</dl>
John Criswell	7a73b80	2003-06-30 21:59:07 +0000	[diff] [blame]	1269
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1270	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1271
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1272	<!-- ======================================================================= -->
Reid Spencer	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	1273	<div class="doc_subsection"><a name="projects"><tt>llvm/projects</tt></a></div>
				1274	<div class="doc_text">
				1275	<p>This directory contains projects that are not strictly part of LLVM but are
				1276	shipped with LLVM. This is also the directory where you should create your own
				1277	LLVM-based projects. See <tt>llvm/projects/sample</tt> for an example of how
				1278	to set up your own project. See <tt>llvm/projects/Stacker</tt> for a fully
				1279	functional example of a compiler front end.</p>
				1280	</div>
				1281
				1282	<!-- ======================================================================= -->
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1283	<div class="doc_subsection"><a name="runtime"><tt>llvm/runtime</tt></a></div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1284	<div class="doc_text">
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1285
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1286	<p>This directory contains libraries which are compiled into LLVM bytecode and
				1287	used when linking programs with the GCC front end. Most of these libraries are
				1288	skeleton versions of real libraries; for example, libc is a stripped down
				1289	version of glibc.</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1290
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1291	<p>Unlike the rest of the LLVM suite, this directory needs the LLVM GCC front
				1292	end to compile.</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1293
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1294	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1295
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1296	<!-- ======================================================================= -->
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1297	<div class="doc_subsection"><a name="test"><tt>llvm/test</tt></a></div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1298	<div class="doc_text">
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1299	<p>This directory contains feature and regression tests and other basic sanity
				1300	checks on the LLVM infrastructure. These are intended to run quickly and cover
				1301	a lot of territory without being exhaustive.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1302	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1303
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1304	<!-- ======================================================================= -->
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1305	<div class="doc_subsection"><a name="llvmtest"><tt>llvm-test</tt></a></div>
				1306	<div class="doc_text">
John Criswell	3d8ba51	2004-12-08 17:53:54 +0000	[diff] [blame]	1307	<p>This is not a directory in the normal llvm module; it is a separate CVS
Misha Brukman	e12215f	2004-11-15 23:20:51 +0000	[diff] [blame]	1308	module that must be checked out (usually to <tt>projects/llvm-test</tt>). This
John Criswell	3d8ba51	2004-12-08 17:53:54 +0000	[diff] [blame]	1309	module contains a comprehensive correctness, performance, and benchmarking
				1310	test
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1311	suite for LLVM. It is a separate CVS module because not every LLVM user is
John Criswell	838bce5	2005-05-09 16:39:27 +0000	[diff] [blame]	1312	interested in downloading or building such a comprehensive test suite. For
				1313	further details on this test suite, please see the
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1314	<a href="TestingGuide.html">Testing Guide</a> document.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1315	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1316
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1317	<!-- ======================================================================= -->
				1318	<div class="doc_subsection"><a name="tools"><tt>llvm/tools</tt></a></div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1319	<div class="doc_text">
John Criswell	20d2d3e	2003-10-10 14:26:14 +0000	[diff] [blame]	1320
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1321	<p>The <b>tools</b> directory contains the executables built out of the
				1322	libraries above, which form the main part of the user interface. You can
				1323	always get help for a tool by typing <tt>tool_name --help</tt>. The
Misha Brukman	e12215f	2004-11-15 23:20:51 +0000	[diff] [blame]	1324	following is a brief introduction to the most important tools. More detailed
				1325	information is in the <a href="CommandGuide/index.html">Command Guide</a>.</p>
John Criswell	20d2d3e	2003-10-10 14:26:14 +0000	[diff] [blame]	1326
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1327	<dl>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1328
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1329	<dt><tt><b>bugpoint</b></tt></dt>
				1330	<dd><tt>bugpoint</tt> is used to debug
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1331	optimization passes or code generation backends by narrowing down the
				1332	given test case to the minimum number of passes and/or instructions that
				1333	still cause a problem, whether it is a crash or miscompilation. See <a
				1334	href="HowToSubmitABug.html">HowToSubmitABug.html</a> for more information
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1335	on using <tt>bugpoint</tt>.</dd>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1336
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1337	<dt><tt><b>llvmc</b></tt></dt>
				1338	<dd>The LLVM Compiler Driver. This program can
				1339	be configured to utilize both LLVM and non-LLVM compilation tools to enable
				1340	pre-processing, translation, optimization, assembly, and linking of programs
				1341	all from one command line. <tt>llvmc</tt> also takes care of processing the
				1342	dependent libraries found in bytecode. This reduces the need to get the
Reid Spencer	079e945	2004-12-08 18:00:30 +0000	[diff] [blame]	1343	traditional <tt>-l<name></tt> options right on the command line. Please
John Criswell	8bfe6a7	2005-05-18 19:43:33 +0000	[diff] [blame]	1344	note that this tool, while functional, is still experimental and not feature
				1345	complete.</dd>
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1346
				1347	<dt><tt><b>llvm-ar</b></tt></dt>
				1348	<dd>The archiver produces an archive containing
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1349	the given LLVM bytecode files, optionally with an index for faster
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1350	lookup.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1351
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1352	<dt><tt><b>llvm-as</b></tt></dt>
				1353	<dd>The assembler transforms the human readable LLVM assembly to LLVM
				1354	bytecode.</dd>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1355
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1356	<dt><tt><b>llvm-dis</b></tt></dt>
				1357	<dd>The disassembler transforms the LLVM bytecode to human readable
				1358	LLVM assembly.</dd>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1359
Reid Spencer	079e945	2004-12-08 18:00:30 +0000	[diff] [blame]	1360	<dt><tt><b>llvm-ld</b></tt></dt>
Reid Spencer	434262a	2007-02-09 15:59:08 +0000	[diff] [blame]	1361	<dd><tt>llvm-ld</tt> is a general purpose and extensible linker for LLVM.
				1362	This is the linker invoked by <tt>llvmc</tt>. It performsn standard link time
				1363	optimizations and allows optimization modules to be loaded and run so that
				1364	language specific optimizations can be applied at link time.</dd>
Reid Spencer	079e945	2004-12-08 18:00:30 +0000	[diff] [blame]	1365
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1366	<dt><tt><b>llvm-link</b></tt></dt>
				1367	<dd><tt>llvm-link</tt>, not surprisingly, links multiple LLVM modules into
				1368	a single program.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1369
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1370	<dt><tt><b>lli</b></tt></dt>
				1371	<dd><tt>lli</tt> is the LLVM interpreter, which
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1372	can directly execute LLVM bytecode (although very slowly...). In addition
				1373	to a simple interpreter, <tt>lli</tt> also has a tracing mode (entered by
				1374	specifying <tt>-trace</tt> on the command line). Finally, for
John Criswell	d9eceee	2004-12-08 18:04:14 +0000	[diff] [blame]	1375	architectures that support it (currently x86, Sparc, and PowerPC), by default,
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1376	<tt>lli</tt> will function as a Just-In-Time compiler (if the
				1377	functionality was compiled in), and will execute the code <i>much</i>
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1378	faster than the interpreter.</dd>
Misha Brukman	ef0ad41	2003-10-06 19:23:34 +0000	[diff] [blame]	1379
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1380	<dt><tt><b>llc</b></tt></dt>
				1381	<dd> <tt>llc</tt> is the LLVM backend compiler, which
John Criswell	8bfe6a7	2005-05-18 19:43:33 +0000	[diff] [blame]	1382	translates LLVM bytecode to a native code assembly file or to C code (with
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1383	the -march=c option).</dd>
Misha Brukman	ef0ad41	2003-10-06 19:23:34 +0000	[diff] [blame]	1384
Reid Spencer	d4694f9	2004-12-22 06:29:07 +0000	[diff] [blame]	1385	<dt><tt><b>llvm-gcc</b></tt></dt>
Reid Spencer	434262a	2007-02-09 15:59:08 +0000	[diff] [blame]	1386	<dd><tt>llvm-gcc</tt> is a GCC-based C frontend that has been retargeted to
				1387	use LLVM as its backend instead of GCC's RTL backend. It can also emit LLVM
				1388	byte code or assembly (with the <tt>-emit-llvm</tt> option) instead of the
				1389	usual machine code output. It works just like any other GCC compiler,
				1390	taking the typical <tt>-c, -S, -E, -o</tt> options that are typically used.
				1391	Additionally, the the source code for <tt>llvm-gcc</tt> is available as a
				1392	separate CVS module.</dd>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1393
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1394	<dt><tt><b>opt</b></tt></dt>
Reid Spencer	84f82f7	2006-08-28 00:34:19 +0000	[diff] [blame]	1395	<dd><tt>opt</tt> reads LLVM bytecode, applies a series of LLVM to LLVM
				1396	transformations (which are specified on the command line), and then outputs
				1397	the resultant bytecode. The '<tt>opt --help</tt>' command is a good way to
				1398	get a list of the program transformations available in LLVM.<br/>
				1399	<dd><tt>opt</tt> can also be used to run a specific analysis on an input
				1400	LLVM bytecode file and print out the results. It is primarily useful for
				1401	debugging analyses, or familiarizing yourself with what an analysis does.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1402	</dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1403	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1404
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1405	<!-- ======================================================================= -->
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1406	<div class="doc_subsection"><a name="utils"><tt>llvm/utils</tt></a></div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1407	<div class="doc_text">
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1408
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1409	<p>This directory contains utilities for working with LLVM source code, and some
				1410	of the utilities are actually required as part of the build process because they
				1411	are code generators for parts of LLVM infrastructure.</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1412
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1413	<dl>
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1414	<dt><tt><b>codegen-diff</b></tt> <dd><tt>codegen-diff</tt> is a script
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1415	that finds differences between code that LLC generates and code that LLI
				1416	generates. This is a useful tool if you are debugging one of them,
				1417	assuming that the other generates correct output. For the full user
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1418	manual, run <tt>`perldoc codegen-diff'</tt>.<br><br>
Misha Brukman	c103adf	2003-08-11 18:45:46 +0000	[diff] [blame]	1419
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1420	<dt><tt><b>cvsupdate</b></tt> <dd><tt>cvsupdate</tt> is a script that will
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1421	update your CVS tree, but produce a much cleaner and more organized output
				1422	than simply running <tt>`cvs -z3 up -dP'</tt> will. For example, it will group
				1423	together all the new and updated files and modified files in separate
				1424	sections, so you can see at a glance what has changed. If you are at the
				1425	top of your LLVM CVS tree, running <tt>utils/cvsupdate</tt> is the
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1426	preferred way of updating the tree.<br><br>
Misha Brukman	c103adf	2003-08-11 18:45:46 +0000	[diff] [blame]	1427
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1428	<dt><tt><b>emacs/</b></tt> <dd>The <tt>emacs</tt> directory contains
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1429	syntax-highlighting files which will work with Emacs and XEmacs editors,
				1430	providing syntax highlighting support for LLVM assembly files and TableGen
				1431	description files. For information on how to use the syntax files, consult
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1432	the <tt>README</tt> file in that directory.<br><br>
Misha Brukman	c103adf	2003-08-11 18:45:46 +0000	[diff] [blame]	1433
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1434	<dt><tt><b>getsrcs.sh</b></tt> <dd>The <tt>getsrcs.sh</tt> script finds
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1435	and outputs all non-generated source files, which is useful if one wishes
				1436	to do a lot of development across directories and does not want to
				1437	individually find each file. One way to use it is to run, for example:
				1438	<tt>xemacs `utils/getsources.sh`</tt> from the top of your LLVM source
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1439	tree.<br><br>
				1440
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1441	<dt><tt><b>llvmgrep</b></tt></dt>
				1442	<dd>This little tool performs an "egrep -H -n" on each source file in LLVM and
				1443	passes to it a regular expression provided on <tt>llvmgrep</tt>'s command
				1444	line. This is a very efficient way of searching the source base for a
				1445	particular regular expression.</dd>
				1446
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1447	<dt><tt><b>makellvm</b></tt> <dd>The <tt>makellvm</tt> script compiles all
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1448	files in the current directory and then compiles and links the tool that
				1449	is the first argument. For example, assuming you are in the directory
				1450	<tt>llvm/lib/Target/Sparc</tt>, if <tt>makellvm</tt> is in your path,
				1451	simply running <tt>makellvm llc</tt> will make a build of the current
				1452	directory, switch to directory <tt>llvm/tools/llc</tt> and build it,
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1453	causing a re-linking of LLC.<br><br>
Misha Brukman	c103adf	2003-08-11 18:45:46 +0000	[diff] [blame]	1454
Tanya Lattner	7a857dd	2007-05-22 06:12:51 +0000	[diff] [blame]	1455	<dt><tt><b>NewNightlyTest.pl</b></tt> and
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1456	<tt><b>NightlyTestTemplate.html</b></tt> <dd>These files are used in a
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1457	cron script to generate nightly status reports of the functionality of
				1458	tools, and the results can be seen by following the appropriate link on
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1459	the <a href="http://llvm.org/">LLVM homepage</a>.<br><br>
Misha Brukman	c103adf	2003-08-11 18:45:46 +0000	[diff] [blame]	1460
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1461	<dt><tt><b>TableGen/</b></tt> <dd>The <tt>TableGen</tt> directory contains
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1462	the tool used to generate register descriptions, instruction set
				1463	descriptions, and even assemblers from common TableGen description
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1464	files.<br><br>
Misha Brukman	c103adf	2003-08-11 18:45:46 +0000	[diff] [blame]	1465
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1466	<dt><tt><b>vim/</b></tt> <dd>The <tt>vim</tt> directory contains
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1467	syntax-highlighting files which will work with the VIM editor, providing
				1468	syntax highlighting support for LLVM assembly files and TableGen
				1469	description files. For information on how to use the syntax files, consult
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1470	the <tt>README</tt> file in that directory.<br><br>
Misha Brukman	c103adf	2003-08-11 18:45:46 +0000	[diff] [blame]	1471
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1472	</dl>
Misha Brukman	c103adf	2003-08-11 18:45:46 +0000	[diff] [blame]	1473
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1474	</div>
Misha Brukman	c103adf	2003-08-11 18:45:46 +0000	[diff] [blame]	1475
Reid Spencer	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	1476	<!-- ======================================================================= -->
				1477	<div class="doc_subsection"><a name="win32"><tt>llvm/win32</tt></a></div>
				1478	<div class="doc_text">
				1479	<p>This directory contains build scripts and project files for use with
				1480	Visual C++. This allows developers on Windows to build LLVM without the need
John Criswell	3d8ba51	2004-12-08 17:53:54 +0000	[diff] [blame]	1481	for Cygwin. The contents of this directory should be considered experimental
Reid Spencer	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	1482	at this time.
				1483	</p>
				1484	</div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1485	<!-- *********************************************************************** -->
				1486	<div class="doc_section">
				1487	<a name="tutorial">An Example Using the LLVM Tool Chain</a>
				1488	</div>
				1489	<!-- *********************************************************************** -->
Misha Brukman	c103adf	2003-08-11 18:45:46 +0000	[diff] [blame]	1490
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1491	<div class="doc_text">
Chris Lattner	5907588	2007-01-04 07:08:27 +0000	[diff] [blame]	1492	<p>This section gives an example of using LLVM. llvm-gcc3 is now obsolete,
				1493	so we only include instructiosn for llvm-gcc4.
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1494	</p>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1495
				1496	<p><b>Note:</b> The <i>gcc4</i> frontend's invocation is <b><i>considerably different</i></b>
				1497	from the previous <i>gcc3</i> frontend. In particular, the <i>gcc4</i> frontend <b><i>does not</i></b>
				1498	create bytecode by default: <i>gcc4</i> produces native code. As the example below illustrates,
				1499	the '--emit-llvm' flag is needed to produce LLVM bytecode output. For <i>makefiles</i> and
				1500	<i>configure</i> scripts, the CFLAGS variable needs '--emit-llvm' to produce bytecode
				1501	output.</p>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1502	</div>
				1503
				1504	<!-- ======================================================================= -->
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1505	<div class="doc_subsection"><a name="tutorial4">Example with llvm-gcc4</a></div>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1506
				1507	<div class="doc_text">
				1508
				1509	<ol>
				1510	<li>First, create a simple C file, name it 'hello.c':
				1511	<pre>
				1512	#include <stdio.h>
				1513	int main() {
				1514	printf("hello world\n");
				1515	return 0;
				1516	}
				1517	</pre></li>
				1518
				1519	<li><p>Next, compile the C file into a native executable:</p>
				1520
				1521	<p><tt>% llvm-gcc hello.c -o hello</tt></p>
				1522
				1523	<p>Note that llvm-gcc works just like GCC by default. The standard -S and
				1524	-c arguments work as usual (producing a native .s or .o file,
				1525	respectively). </p>
				1526
				1527	<li><p>Next, compile the C file into a LLVM bytecode file:</p>
				1528	<p><tt>% llvm-gcc -O3 -emit-llvm hello.c -c -o hello.bc</tt></p>
				1529
				1530	<p>The -emit-llvm option can be used with the -S or -c options to emit an
				1531	LLVM ".ll" or ".bc" file (respectively) for the code. This allows you
				1532	to use the <a href="CommandGuide/index.html">standard LLVM tools</a> on
				1533	the bytecode file.</p>
				1534
				1535	<p>Unlike llvm-gcc3, llvm-gcc4 correctly responds to -O[0123] arguments.
				1536	</p></li>
				1537
				1538	<li><p>Run the program in both forms. To run the program, use:</p>
				1539
				1540	<p><tt>% ./hello</tt></p>
				1541
				1542	<p>and</p>
				1543
Chris Lattner	6e3b7c2	2006-08-14 20:51:35 +0000	[diff] [blame]	1544	<p><tt>% lli hello.bc</tt></p>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1545
				1546	<p>The second examples shows how to invoke the LLVM JIT, <a
Chris Lattner	6e3b7c2	2006-08-14 20:51:35 +0000	[diff] [blame]	1547	href="CommandGuide/html/lli.html">lli</a>.</p></li>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1548
				1549	<li><p>Use the <tt>llvm-dis</tt> utility to take a look at the LLVM assembly
				1550	code:</p>
				1551
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1552	<p><tt>% llvm-dis < hello.bc \| less</tt><br><br></li>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1553
				1554	<li><p>Compile the program to native assembly using the LLC code
				1555	generator:</p>
				1556
				1557	<p><tt>% llc hello.bc -o hello.s</tt></p>
				1558
				1559	<li><p>Assemble the native assembly language file into a program:</p>
				1560
				1561	<p><b>Solaris:</b><tt>% /opt/SUNWspro/bin/cc -xarch=v9 hello.s -o hello.native</tt></p>
				1562	<p><b>Others:</b><tt>% gcc hello.s -o hello.native</tt></p>
				1563
				1564	<li><p>Execute the native code program:</p>
				1565
Chris Lattner	6e3b7c2	2006-08-14 20:51:35 +0000	[diff] [blame]	1566	<p><tt>% ./hello.native</tt></p>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1567
				1568	<p>Note that using llvm-gcc to compile directly to native code (i.e. when
				1569	the -emit-llvm option is not present) does steps 6/7/8 for you.</p>
Chris Lattner	6e3b7c2	2006-08-14 20:51:35 +0000	[diff] [blame]	1570	</li>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1571
				1572	</ol>
				1573
				1574	</div>
				1575
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1576
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1577	<!-- *********************************************************************** -->
				1578	<div class="doc_section">
				1579	<a name="problems">Common Problems</a>
				1580	</div>
				1581	<!-- *********************************************************************** -->
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1582
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1583	<div class="doc_text">
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1584
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1585	<p>If you are having problems building or using LLVM, or if you have any other
				1586	general questions about LLVM, please consult the <a href="FAQ.html">Frequently
				1587	Asked Questions</a> page.</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1588
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1589	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1590
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1591	<!-- *********************************************************************** -->
				1592	<div class="doc_section">
				1593	<a name="links">Links</a>
				1594	</div>
				1595	<!-- *********************************************************************** -->
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1596
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1597	<div class="doc_text">
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1598
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1599	<p>This document is just an <b>introduction</b> to how to use LLVM to do
				1600	some simple things... there are many more interesting and complicated things
				1601	that you can do that aren't documented here (but we'll gladly accept a patch
				1602	if you want to write something up!). For more information about LLVM, check
				1603	out:</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1604
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1605	<ul>
Reid Spencer	05fe4b0	2006-03-14 05:39:39 +0000	[diff] [blame]	1606	<li><a href="http://llvm.org/">LLVM homepage</a></li>
				1607	<li><a href="http://llvm.org/doxygen/">LLVM doxygen tree</a></li>
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Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1609	that Uses LLVM</a></li>
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Misha Brukman	142207b	2003-11-22 01:30:01 +0000	[diff] [blame]	1617	<address>
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1618	<a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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Misha Brukman	142207b	2003-11-22 01:30:01 +0000	[diff] [blame]	1623	<a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1624	<a href="http://llvm.x10sys.com/rspencer/">Reid Spencer</a><br>
Reid Spencer	05fe4b0	2006-03-14 05:39:39 +0000	[diff] [blame]	1625	<a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1626	Last modified: $Date$
Misha Brukman	142207b	2003-11-22 01:30:01 +0000	[diff] [blame]	1627	</address>
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