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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	defb9fb	2007-06-19 05:52:36 +0000	[diff] [blame]	22	<li><a href="#brokengcc">Broken versions of GCC and other tools</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>
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	30	<li><a href="#checkout">Checkout LLVM from Subversion</a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	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>
Reid Spencer	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	41	<li><a href="#examples"><tt>llvm/examples</tt></a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	42	<li><a href="#include"><tt>llvm/include</tt></a>
				43	<li><a href="#lib"><tt>llvm/lib</tt></a>
Reid Spencer	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	44	<li><a href="#projects"><tt>llvm/projects</tt></a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	45	<li><a href="#runtime"><tt>llvm/runtime</tt></a>
				46	<li><a href="#test"><tt>llvm/test</tt></a>
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	47	<li><a href="#llvmtest"><tt>llvm-test</tt></a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	48	<li><a href="#tools"><tt>llvm/tools</tt></a>
				49	<li><a href="#utils"><tt>llvm/utils</tt></a>
Reid Spencer	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	50	<li><a href="#win32"><tt>llvm/win32</tt></a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	51	</ol></li>
John Criswell	0f6d7c0	2003-10-27 18:18:16 +0000	[diff] [blame]	52
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	53	<li><a href="#tutorial">An Example Using the LLVM Tool Chain</a>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	54	<ol>
				55	<li><a href="#tutorial4">Example with llvm-gcc4</a></li>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	56	</ol>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	57	<li><a href="#problems">Common Problems</a>
				58	<li><a href="#links">Links</a>
				59	</ul>
				60
Chris Lattner	7911ce2	2004-05-23 21:07:27 +0000	[diff] [blame]	61	<div class="doc_author">
				62	<p>Written by:
				63	<a href="mailto:criswell@uiuc.edu">John Criswell</a>,
				64	<a href="mailto:sabre@nondot.org">Chris Lattner</a>,
				65	<a href="http://misha.brukman.net">Misha Brukman</a>,
				66	<a href="http://www.cs.uiuc.edu/~vadve">Vikram Adve</a>, and
				67	<a href="mailto:gshi1@uiuc.edu">Guochun Shi</a>.
				68	</p>
				69	</div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	70
				71
				72	<!-- *********************************************************************** -->
				73	<div class="doc_section">
				74	<a name="overview"><b>Overview</b></a>
				75	</div>
				76	<!-- *********************************************************************** -->
				77
				78	<div class="doc_text">
				79
				80	<p>Welcome to LLVM! In order to get started, you first need to know some
				81	basic information.</p>
				82
				83	<p>First, LLVM comes in two pieces. The first piece is the LLVM suite. This
				84	contains all of the tools, libraries, and header files needed to use the low
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	85	level virtual machine. It contains an assembler, disassembler, bitcode
				86	analyzer and bitcode optimizer. It also contains a test suite that can be
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	87	used to test the LLVM tools and the GCC front end.</p>
				88
				89	<p>The second piece is the GCC front end. This component provides a version of
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	90	GCC that compiles C and C++ code into LLVM bitcode. Currently, the GCC front
Chris Lattner	82ad9f1	2007-03-06 06:27:34 +0000	[diff] [blame]	91	end uses the GCC parser to convert code to LLVM. Once
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	92	compiled into LLVM bitcode, a program can be manipulated with the LLVM tools
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	93	from the LLVM suite.</p>
				94
John Criswell	3d8ba51	2004-12-08 17:53:54 +0000	[diff] [blame]	95	<p>
				96	There is a third, optional piece called llvm-test. It is a suite of programs
				97	with a testing harness that can be used to further test LLVM's functionality
				98	and performance.
				99	</p>
				100
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	101	</div>
				102
				103	<!-- *********************************************************************** -->
				104	<div class="doc_section">
				105	<a name="quickstart"><b>Getting Started Quickly (A Summary)</b></a>
				106	</div>
				107	<!-- *********************************************************************** -->
				108
				109	<div class="doc_text">
				110
				111	<p>Here's the short story for getting up and running quickly with LLVM:</p>
				112
				113	<ol>
Reid Spencer	9f54791	2004-11-08 00:29:22 +0000	[diff] [blame]	114	<li>Read the documentation.</li>
				115	<li>Read the documentation.</li>
				116	<li>Remember that you were warned twice about reading the documentation.</li>
Tanya Lattner	ff37adc	2007-09-27 18:14:33 +0000	[diff] [blame]	117	<li>Install the llvm-gcc4.0 (or llvm-gcc4.2) front end if you intend to compile C or C++:
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	118	<ol>
Reid Spencer	d4694f9	2004-12-22 06:29:07 +0000	[diff] [blame]	119	<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]	120	<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]	121	</li>
Tanya Lattner	ff37adc	2007-09-27 18:14:33 +0000	[diff] [blame]	122	<ul><li>If the binary extension is ".bz" use bunzip2 instead of gunzip.</li>
				123	</ul>
Tanya Lattner	f7b6be0	2006-11-20 06:04:46 +0000	[diff] [blame]	124	<li>Add llvm-gcc's "bin" directory to your PATH variable.</li>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	125	</ol></li>
				126
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	127	<li>Get the LLVM Source Code
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	128	<ul>
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	129	<li>With the distributed files (or use <a href="#checkout">SVN</a>):
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	130	<ol>
				131	<li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
John Criswell	364cec4	2004-03-12 20:31:37 +0000	[diff] [blame]	132	<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]	133	</ol></li>
				134
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	135	</ul></li>
				136
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	137	<li><b>[Optional]</b> Get the Test Suite Source Code
John Criswell	9e2485c	2004-12-10 15:51:16 +0000	[diff] [blame]	138	<ul>
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	139	<li>With the distributed files (or use <a href="#checkout">SVN</a>):
John Criswell	9e2485c	2004-12-10 15:51:16 +0000	[diff] [blame]	140	<ol>
				141	<li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
				142	<li><tt>cd llvm/projects</tt>
				143	<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]	144	</ol></li>
				145
John Criswell	9e2485c	2004-12-10 15:51:16 +0000	[diff] [blame]	146	</ul></li>
				147
				148
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	149	<li>Configure the LLVM Build Environment
				150	<ol>
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	151	<li><tt>cd <i>where-you-want-to-build-llvm</i></tt></li>
				152	<li><tt><i>/path/to/llvm/</i>configure [options]</tt><br>
				153	Some common options:
				154
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	155	<ul>
Reid Spencer	d4694f9	2004-12-22 06:29:07 +0000	[diff] [blame]	156	<li><tt>--prefix=<i>directory</i></tt>
				157	<p>Specify for <i>directory</i> the full pathname of where you
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	158	want the LLVM tools and libraries to be installed (default
				159	<tt>/usr/local</tt>).</p></li>
Reid Spencer	fef93b7	2004-12-26 05:47:26 +0000	[diff] [blame]	160	<li><tt>--with-llvmgccdir=<i>directory</i></tt>
				161	<p>Optionally, specify for <i>directory</i> the full pathname of the
John Criswell	838bce5	2005-05-09 16:39:27 +0000	[diff] [blame]	162	C/C++ front end installation to use with this LLVM configuration. If
Reid Spencer	fef93b7	2004-12-26 05:47:26 +0000	[diff] [blame]	163	not specified, the PATH will be searched.</p></li>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	164	<li><tt>--enable-spec2000=<i>directory</i></tt>
				165	<p>Enable the SPEC2000 benchmarks for testing. The SPEC2000
				166	benchmarks should be available in
				167	<tt><i>directory</i></tt>.</p></li>
				168	</ul>
				169	</ol></li>
				170
				171	<li>Build the LLVM Suite:
				172	<ol>
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	173	<li><tt>gmake -k \|& tee gnumake.out
				174	# this is csh or tcsh syntax</tt></li>
Chris Lattner	78ce3b8	2007-01-04 07:06:05 +0000	[diff] [blame]	175	<li>If you get an "internal compiler error (ICE)" or test failures, see
				176	<a href="#brokengcc">below</a>.</li>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	177	</ol>
				178
				179	</ol>
				180
Chris Lattner	fcd3725	2004-06-21 22:52:48 +0000	[diff] [blame]	181	<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]	182	detailed information on configuring and compiling LLVM. See <a
				183	href="#environment">Setting Up Your Environment</a> for tips that simplify
				184	working with the GCC front end and LLVM tools. Go to <a href="#layout">Program
				185	Layout</a> to learn about the layout of the source code tree.</p>
				186
				187	</div>
				188
				189	<!-- *********************************************************************** -->
				190	<div class="doc_section">
				191	<a name="requirements"><b>Requirements</b></a>
				192	</div>
				193	<!-- *********************************************************************** -->
				194
				195	<div class="doc_text">
				196
				197	<p>Before you begin to use the LLVM system, review the requirements given below.
				198	This may save you some trouble by knowing ahead of time what hardware and
				199	software you will need.</p>
				200
				201	</div>
				202
				203	<!-- ======================================================================= -->
				204	<div class="doc_subsection">
				205	<a name="hardware"><b>Hardware</b></a>
				206	</div>
				207
				208	<div class="doc_text">
				209
				210	<p>LLVM is known to work on the following platforms:</p>
				211
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	212	<table cellpadding="3" summary="Known LLVM platforms">
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	213	<tr>
				214	<th>OS</th>
				215	<th>Arch</th>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	216	<th>Compilers</th>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	217	</tr>
				218	<tr>
				219	<td>Linux</td>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	220	<td>x86<sup><a href="#pf_1">1</a></sup></td>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	221	<td>GCC</td>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	222	</tr>
				223	<tr>
				224	<td>Solaris</td>
				225	<td>V9 (Ultrasparc)</td>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	226	<td>GCC</td>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	227	</tr>
				228	<tr>
				229	<td>FreeBSD</td>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	230	<td>x86<sup><a href="#pf_1">1</a></sup></td>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	231	<td>GCC</td>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	232	</tr>
				233	<tr>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	234	<td>MacOS X<sup><a href="#pf_2">2</a></sup></td>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	235	<td>PowerPC</td>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	236	<td>GCC</td>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	237	</tr>
				238	<tr>
Tanya Lattner	993b980	2006-04-20 04:35:34 +0000	[diff] [blame]	239	<td>MacOS X<sup><a href="#pf_2">2</a></sup></td>
				240	<td>x86</td>
				241	<td>GCC</td>
				242
				243	</tr>
				244	<tr>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	245	<td>Cygwin/Win32</td>
Chris Lattner	6947e55	2006-07-21 00:06:27 +0000	[diff] [blame]	246	<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]	247	<td>GCC 3.4.X, binutils 2.15</td>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	248	</tr>
Misha Brukman	c155a0a	2004-12-23 07:14:56 +0000	[diff] [blame]	249	<tr>
Chris Lattner	8ccb87f	2005-02-09 20:43:48 +0000	[diff] [blame]	250	<td>MinGW/Win32</td>
Chris Lattner	6947e55	2006-07-21 00:06:27 +0000	[diff] [blame]	251	<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]	252	<td>GCC 3.4.X, binutils 2.15</td>
				253	</tr>
				254	<tr>
Misha Brukman	c155a0a	2004-12-23 07:14:56 +0000	[diff] [blame]	255	<td>Linux</td>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	256	<td>amd64<sup><a href="#pf_3">3</a></sup></td>
Misha Brukman	c155a0a	2004-12-23 07:14:56 +0000	[diff] [blame]	257	<td>GCC</td>
				258	</tr>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	259	</table>
				260
				261	<p>LLVM has partial support for the following platforms:</p>
				262
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	263	<table summary="LLVM partial platform support">
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	264	<tr>
				265	<th>OS</th>
				266	<th>Arch</th>
				267	<th>Compilers</th>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	268	</tr>
Misha Brukman	0011769	2004-11-15 21:05:08 +0000	[diff] [blame]	269	<tr>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	270	<td>Windows</td>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	271	<td>x86<sup><a href="#pf_1">1</a></sup></td>
				272	<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]	273	<tr>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	274	<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]	275	<td>PowerPC</td>
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	276	<td>GCC</td>
				277	</tr>
				278	<tr>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	279	<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]	280	<td>PowerPC</td>
				281	<td>GCC</td>
Misha Brukman	0011769	2004-11-15 21:05:08 +0000	[diff] [blame]	282	</tr>
John Criswell	7516255	2005-05-09 16:49:59 +0000	[diff] [blame]	283
				284	<tr>
				285	<td>Linux<sup><a href="#pf_7">7</a></sup></td>
				286	<td>Alpha</td>
				287	<td>GCC</td>
				288	</tr>
				289	<tr>
				290	<td>Linux<sup><a href="#pf_7">7</a></sup></td>
				291	<td>Itanium (IA-64)</td>
				292	<td>GCC</td>
				293	</tr>
Duraid Madina	e8714af	2005-05-10 06:57:53 +0000	[diff] [blame]	294	<tr>
				295	<td>HP-UX<sup><a href="#pf_7">7</a></sup></td>
				296	<td>Itanium (IA-64)</td>
				297	<td>HP aCC</td>
				298	</tr>
Misha Brukman	14ab537	2004-11-15 05:19:53 +0000	[diff] [blame]	299	</table>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	300
Misha Brukman	a892ead	2005-02-09 21:01:26 +0000	[diff] [blame]	301	<p><b>Notes:</b></p>
				302
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	303	<div class="doc_notes">
				304	<ol>
				305	<li><a name="pf_1">Code generation supported for Pentium processors and
				306	up</a></li>
				307	<li><a name="pf_2">Code generation supported for 32-bit ABI only</a></li>
				308	<li><a name="pf_3">No native code generation</a></li>
				309	<li><a name="pf_4">Build is not complete: one or more tools don't link</a></li>
				310	<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]	311	<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]	312	<a href="http://www.mingw.org/MinGWiki/">Download</a> and install
Chris Lattner	6947e55	2006-07-21 00:06:27 +0000	[diff] [blame]	313	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]	314	if necessary. Bison & flex can be also grabbed from GNUWin32 sf.net
				315	project.</li>
John Criswell	7516255	2005-05-09 16:49:59 +0000	[diff] [blame]	316	<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]	317	<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]	318	preventing LLVM from building correctly. Several workarounds have been
				319	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]	320	future. We highly recommend that you rebuild your current binutils with the
Chris Lattner	6947e55	2006-07-21 00:06:27 +0000	[diff] [blame]	321	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]	322	Binutils bugzilla</a>, if it wasn't already applied.</li>
Misha Brukman	a892ead	2005-02-09 21:01:26 +0000	[diff] [blame]	323	</ol>
Misha Brukman	a892ead	2005-02-09 21:01:26 +0000	[diff] [blame]	324	</div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	325
Misha Brukman	69def74	2004-11-19 21:53:22 +0000	[diff] [blame]	326	<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]	327	mode, depending on the system (it is so large because of all the debugging
				328	information and the fact that the libraries are statically linked into multiple
				329	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]	330	you can disable them individually in <tt>llvm/tools/Makefile</tt>. The Release
				331	build requires considerably less space.</p>
				332
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	333	<p>The LLVM suite <i>may</i> compile on other platforms, but it is not
				334	guaranteed to do so. If compilation is successful, the LLVM utilities should be
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	335	able to assemble, disassemble, analyze, and optimize LLVM bitcode. Code
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	336	generation should work as well, although the generated native code may not work
				337	on your platform.</p>
				338
				339	<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]	340	to work on another platform, you can download a copy of the source and <a
				341	href="CFEBuildInstrs.html">try to compile it</a> on your platform.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	342
				343	</div>
				344
				345	<!-- ======================================================================= -->
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	346	<div class="doc_subsection"><a name="software"><b>Software</b></a></div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	347	<div class="doc_text">
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	348	<p>Compiling LLVM requires that you have several software packages
				349	installed. The table below lists those required packages. The Package column
				350	is the usual name for the software package that LLVM depends on. The Version
				351	column provides "known to work" versions of the package. The Notes column
				352	describes how LLVM uses the package and provides other details.</p>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	353	<table summary="Packages required to compile LLVM">
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	354	<tr><th>Package</th><th>Version</th><th>Notes</th></tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	355
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	356	<tr>
				357	<td><a href="http://savannah.gnu.org/projects/make">GNU Make</a></td>
				358	<td>3.79, 3.79.1</td>
				359	<td>Makefile/build processor</td>
				360	</tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	361
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	362	<tr>
				363	<td><a href="http://gcc.gnu.org">GCC</a></td>
				364	<td>3.4.2</td>
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	365	<td>C/C++ compiler<sup><a href="#sf1">1</a></sup></td>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	366	</tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	367
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	368	<tr>
Chris Lattner	2286cab	2005-09-06 04:07:15 +0000	[diff] [blame]	369	<td><a href="http://www.gnu.org/software/texinfo">TeXinfo</a></td>
				370	<td>4.5</td>
				371	<td>For building the CFE</td>
				372	</tr>
				373
				374	<tr>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	375	<td><a href="http://www.gnu.org/software/flex">Flex</a></td>
				376	<td>2.5.4</td>
				377	<td>LEX compiler</td>
				378	</tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	379
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	380	<tr>
				381	<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]	382	<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]	383	<td>YACC compiler</td>
				384	</tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	385
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	386	<tr>
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	387	<td><a href="http://subversion.tigris.org/project_packages.html">SVN</a></td>
				388	<td>≥1.3</td>
				389	<td>Subversion access to LLVM<sup><a href="#sf2">2</a></sup></td>
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	390	</tr>
				391
				392	<tr>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	393	<td><a href="http://savannah.gnu.org/projects/dejagnu">DejaGnu</a></td>
				394	<td>1.4.2</td>
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	395	<td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	396	</tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	397
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	398	<tr>
				399	<td><a href="http://www.tcl.tk/software/tcltk/">tcl</a></td>
				400	<td>8.3, 8.4</td>
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	401	<td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	402	</tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	403
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	404	<tr>
				405	<td><a href="http://expect.nist.gov/">expect</a></td>
				406	<td>5.38.0</td>
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	407	<td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	408	</tr>
				409
				410	<tr>
				411	<td><a href="http://www.perl.com/download.csp">perl</a></td>
Reid Spencer	200d93b	2004-12-09 17:55:37 +0000	[diff] [blame]	412	<td>≥5.6.0</td>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	413	<td>Nightly tester, utilities</td>
				414	</tr>
				415
				416	<tr>
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	417	<td><a href="http://savannah.gnu.org/projects/m4">GNU M4</a>
				418	<td>1.4</td>
				419	<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]	420	</tr>
				421
				422	<tr>
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	423	<td><a href="http://www.gnu.org/software/autoconf">GNU Autoconf</a></td>
				424	<td>2.59</td>
				425	<td>Configuration script builder<sup><a href="#sf4">4</a></sup></td>
				426	</tr>
				427
				428	<tr>
				429	<td><a href="http://www.gnu.org/software/automake">GNU Automake</a></td>
				430	<td>1.9.2</td>
				431	<td>aclocal macro generator<sup><a href="#sf4">4</a></sup></td>
				432	</tr>
				433
				434	<tr>
				435	<td><a href="http://savannah.gnu.org/projects/libtool">libtool</a></td>
				436	<td>1.5.10</td>
				437	<td>Shared library manager<sup><a href="#sf4">4</a></sup></td>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	438	</tr>
				439
				440	</table>
				441
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	442	<p><b>Notes:</b></p>
				443	<div class="doc_notes">
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	444	<ol>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	445	<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]	446	need to build the other languages for LLVM's purposes.</a> See
				447	<a href="#brokengcc">below</a> for specific version info.</li>
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	448	<li><a name="sf2">You only need Subversion if you intend to build from the
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	449	latest LLVM sources. If you're working from a release distribution, you
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	450	don't need Subversion.</a></li>
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	451	<li><a name="sf3">Only needed if you want to run the automated test
				452	suite in the <tt>llvm/test</tt> directory.</a></li>
				453	<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]	454	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]	455	or higher). You will also need automake (1.9.2). We only use aclocal
				456	from that package.</a></li>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	457	</ol>
Misha Brukman	6d8e153	2005-02-09 22:38:47 +0000	[diff] [blame]	458	</div>
				459
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	460	<p>Additionally, your compilation host is expected to have the usual
				461	plethora of Unix utilities. Specifically:</p>
				462	<ul>
				463	<li><b>ar</b> - archive library builder</li>
				464	<li><b>bzip2*</b> - bzip2 command for distribution generation</li>
				465	<li><b>bunzip2*</b> - bunzip2 command for distribution checking</li>
				466	<li><b>chmod</b> - change permissions on a file</li>
John Criswell	c4ef3f2	2004-12-08 16:55:27 +0000	[diff] [blame]	467	<li><b>cat</b> - output concatenation utility</li>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	468	<li><b>cp</b> - copy files</li>
				469	<li><b>date</b> - print the current date/time </li>
				470	<li><b>echo</b> - print to standard output</li>
				471	<li><b>egrep</b> - extended regular expression search utility</li>
				472	<li><b>etags</b> - C/C++ tag file creator for vim/emacs</li>
				473	<li><b>find</b> - find files/dirs in a file system</li>
				474	<li><b>grep</b> - regular expression search utility</li>
				475	<li><b>gzip*</b> - gzip command for distribution generation</li>
				476	<li><b>gunzip*</b> - gunzip command for distribution checking</li>
				477	<li><b>install</b> - install directories/files </li>
				478	<li><b>mkdir</b> - create a directory</li>
				479	<li><b>mv</b> - move (rename) files</li>
				480	<li><b>ranlib</b> - symbol table builder for archive libraries</li>
Misha Brukman	616bd05	2004-11-20 01:27:40 +0000	[diff] [blame]	481	<li><b>rm</b> - remove (delete) files and directories</li>
Reid Spencer	748d82e	2004-11-15 21:15:12 +0000	[diff] [blame]	482	<li><b>sed</b> - stream editor for transforming output</li>
				483	<li><b>sh</b> - Bourne shell for make build scripts</li>
				484	<li><b>tar</b> - tape archive for distribution generation</li>
				485	<li><b>test</b> - test things in file system</li>
				486	<li><b>unzip*</b> - unzip command for distribution checking</li>
				487	<li><b>zip*</b> - zip command for distribution generation</li>
				488	</ul>
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	489	</div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	490
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	491	<!-- ======================================================================= -->
				492	<div class="doc_subsection">
Chris Lattner	defb9fb	2007-06-19 05:52:36 +0000	[diff] [blame]	493	<a name="brokengcc">Broken versions of GCC and other tools</a>
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	494	</div>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	495
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	496	<div class="doc_text">
				497
				498	<p>LLVM is very demanding of the host C++ compiler, and as such tends to expose
				499	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]	500	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]	501	successfully with them (however, see important notes below). Other versions
				502	of GCC will probably work as well. GCC versions listed
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	503	here are known to not work. If you are using one of these versions, please try
				504	to upgrade your GCC to something more recent. If you run into a problem with a
				505	version of GCC not listed here, please <a href="mailto:llvmdev@cs.uiuc.edu">let
				506	us know</a>. Please use the "<tt>gcc -v</tt>" command to find out which version
				507	of GCC you are using.
				508	</p>
				509
				510	<p><b>GCC versions prior to 3.0</b>: GCC 2.96.x and before had several
				511	problems in the STL that effectively prevent it from compiling LLVM.
				512	</p>
				513
John Criswell	294ba02	2004-11-23 22:06:24 +0000	[diff] [blame]	514	<p><b>GCC 3.2.2</b>: This version of GCC fails to compile LLVM.</p>
				515
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	516	<p><b>GCC 3.3.2</b>: This version of GCC suffered from a <a
				517	href="http://gcc.gnu.org/PR13392">serious bug</a> which causes it to crash in
				518	the "<tt>convert_from_eh_region_ranges_1</tt>" GCC function.</p>
Chris Lattner	25e7b16	2005-02-12 20:11:13 +0000	[diff] [blame]	519
Chris Lattner	8e64f15	2005-02-13 22:20:49 +0000	[diff] [blame]	520	<p><b>Cygwin GCC 3.3.3</b>: The version of GCC 3.3.3 commonly shipped with
				521	Cygwin does not work. Please <a href="CFEBuildInstrs.html#cygwin">upgrade
				522	to a newer version</a> if possible.</p>
				523	<p><b>SuSE GCC 3.3.3</b>: The version of GCC 3.3.3 shipped with SuSE 9.1 (and
				524	possibly others) does not compile LLVM correctly (it appears that exception
				525	handling is broken in some cases). Please download the FSF 3.3.3 or upgrade
				526	to a newer version of GCC.</p>
Bill Wendling	18bf0d0	2007-07-16 08:52:56 +0000	[diff] [blame]	527	<p><b>GCC 3.4.0 on linux/x86 (32-bit)</b>: GCC miscompiles portions of the
Chris Lattner	36117ac	2007-05-10 06:42:21 +0000	[diff] [blame]	528	code generator, causing an infinite loop in the llvm-gcc build when built
				529	with optimizations enabled (i.e. a release build).</p>
Bill Wendling	18bf0d0	2007-07-16 08:52:56 +0000	[diff] [blame]	530	<p><b>GCC 3.4.2 on linux/x86 (32-bit)</b>: GCC miscompiles portions of the
Chris Lattner	36117ac	2007-05-10 06:42:21 +0000	[diff] [blame]	531	code generator at -O3, as with 3.4.0. However gcc 3.4.2 (unlike 3.4.0)
				532	correctly compiles LLVM at -O2. A work around is to build release LLVM
				533	builds with "make ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O2 ..."</p>
Bill Wendling	18bf0d0	2007-07-16 08:52:56 +0000	[diff] [blame]	534	<p><b>GCC 3.4.x on X86-64/amd64</b>: GCC <a href="http://llvm.org/PR1056">
Chris Lattner	77c2af6	2007-04-01 20:14:46 +0000	[diff] [blame]	535	miscompiles portions of LLVM</a>.</p>
Chris Lattner	f2b5e6e	2005-05-15 22:26:45 +0000	[diff] [blame]	536	<p><b>IA-64 GCC 4.0.0</b>: The IA-64 version of GCC 4.0.0 is known to
				537	miscompile LLVM.</p>
Chris Lattner	dd19791	2006-06-16 19:53:39 +0000	[diff] [blame]	538	<p><b>Apple Xcode 2.3</b>: GCC crashes when compiling LLVM at -O3 (which is the
				539	default with ENABLE_OPTIMIZED=1. To work around this, build with
				540	"ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O2".</p>
Chris Lattner	c40eb5e	2006-09-07 17:34:27 +0000	[diff] [blame]	541	<p><b>GCC 4.1.1</b>: GCC fails to build LLVM with template concept check errors
				542	compiling some files. At the time of this writing, GCC mainline (4.2)
				543	did not share the problem.</p>
Chris Lattner	78ce3b8	2007-01-04 07:06:05 +0000	[diff] [blame]	544	<p><b>GCC 4.1.1 on X86-64/amd64</b>: GCC <a href="http://llvm.org/PR1063">
				545	miscompiles portions of LLVM</a> when compiling llvm itself into 64-bit
				546	code. LLVM will appear to mostly work but will be buggy, e.g. failing
				547	portions of its testsuite.</p>
Reid Spencer	72f92f0	2007-04-11 21:28:31 +0000	[diff] [blame]	548	<p><b>GCC 4.1.2 on OpenSUSE</b>: Seg faults during libstdc++ build and on x86_64
				549	platforms compiling md5.c gets a mangled constant.</p>
Reid Spencer	7a11908	2006-11-04 00:33:42 +0000	[diff] [blame]	550	<p><b>GNU ld 2.16.X</b>. Some 2.16.X versions of the ld linker will produce very
				551	long warning messages complaining that some ".gnu.linkonce.t.*" symbol was
				552	defined in a discarded section. You can safely ignore these messages as they are
				553	erroneous and the linkage is correct. These messages disappear using ld
				554	2.17.</p>
Chris Lattner	defb9fb	2007-06-19 05:52:36 +0000	[diff] [blame]	555
				556	<p><b>GNU binutils 2.17</b>: Binutils 2.17 contains <a
				557	href="http://sourceware.org/bugzilla/show_bug.cgi?id=3111">a bug</a> which
				558	causes huge link times (minutes instead of seconds) when building LLVM. We
				559	recommend upgrading to a newer version (2.17.50.0.4 or later).</p>
				560
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	561	</div>
				562
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	563
				564
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	565	<!-- *********************************************************************** -->
				566	<div class="doc_section">
				567	<a name="starting"><b>Getting Started with LLVM</b></a>
				568	</div>
				569	<!-- *********************************************************************** -->
				570
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	571	<div class="doc_text">
				572
				573	<p>The remainder of this guide is meant to get you up and running with
				574	LLVM and to give you some basic information about the LLVM environment.</p>
				575
				576	<p>The later sections of this guide describe the <a
				577	href="#layout">general layout</a> of the the LLVM source tree, a <a
				578	href="#tutorial">simple example</a> using the LLVM tool chain, and <a
				579	href="#links">links</a> to find more information about LLVM or to get
				580	help via e-mail.</p>
				581	</div>
				582
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	583	<!-- ======================================================================= -->
				584	<div class="doc_subsection">
				585	<a name="terminology">Terminology and Notation</a>
				586	</div>
				587
				588	<div class="doc_text">
				589
				590	<p>Throughout this manual, the following names are used to denote paths
				591	specific to the local system and working environment. <i>These are not
				592	environment variables you need to set but just strings used in the rest
				593	of this document below</i>. In any of the examples below, simply replace
				594	each of these names with the appropriate pathname on your local system.
				595	All these paths are absolute:</p>
				596
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	597	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	598	<dt>SRC_ROOT
				599	<dd>
				600	This is the top level directory of the LLVM source tree.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	601	<br><br>
John Criswell	0f6d7c0	2003-10-27 18:18:16 +0000	[diff] [blame]	602
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	603	<dt>OBJ_ROOT
				604	<dd>
				605	This is the top level directory of the LLVM object tree (i.e. the
				606	tree where object files and compiled programs will be placed. It
				607	can be the same as SRC_ROOT).
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	608	<br><br>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	609
				610	<dt>LLVMGCCDIR
				611	<dd>
Reid Spencer	fef93b7	2004-12-26 05:47:26 +0000	[diff] [blame]	612	This is where the LLVM GCC Front End is installed.
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	613	<p>
				614	For the pre-built GCC front end binaries, the LLVMGCCDIR is
Tanya Lattner	f7b6be0	2006-11-20 06:04:46 +0000	[diff] [blame]	615	<tt>llvm-gcc/<i>platform</i>/llvm-gcc</tt>.
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	616	</dl>
				617
				618	</div>
				619
				620	<!-- ======================================================================= -->
				621	<div class="doc_subsection">
				622	<a name="environment">Setting Up Your Environment</a>
				623	</div>
				624
				625	<div class="doc_text">
				626
				627	<p>
Misha Brukman	8f0cad1	2005-02-03 18:28:08 +0000	[diff] [blame]	628	In order to compile and use LLVM, you may need to set some environment
				629	variables.
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	630
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	631	<dl>
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	632	<dt><tt>LLVM_LIB_SEARCH_PATH</tt>=<tt>/path/to/your/bitcode/libs</tt></dt>
Misha Brukman	8f0cad1	2005-02-03 18:28:08 +0000	[diff] [blame]	633	<dd>[Optional] This environment variable helps LLVM linking tools find the
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	634	locations of your bitcode libraries. It is provided only as a
Misha Brukman	8f0cad1	2005-02-03 18:28:08 +0000	[diff] [blame]	635	convenience since you can specify the paths using the -L options of the
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	636	tools and the C/C++ front-end will automatically use the bitcode files
John Criswell	8bfe6a7	2005-05-18 19:43:33 +0000	[diff] [blame]	637	installed in its
Misha Brukman	8f0cad1	2005-02-03 18:28:08 +0000	[diff] [blame]	638	<tt>lib</tt> directory.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	639	</dl>
				640
				641	</div>
				642
				643	<!-- ======================================================================= -->
				644	<div class="doc_subsection">
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	645	<a name="unpack">Unpacking the LLVM Archives</a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	646	</div>
				647
				648	<div class="doc_text">
				649
				650	<p>
				651	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]	652	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]	653	suite and the LLVM GCC front end compiled for your platform. There is an
				654	additional test suite that is optional. Each file is a TAR archive that is
				655	compressed with the gzip program.
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	656	</p>
				657
Misha Brukman	3ce1103	2005-02-02 18:01:57 +0000	[diff] [blame]	658	<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]	659	<dl>
Misha Brukman	3ce1103	2005-02-02 18:01:57 +0000	[diff] [blame]	660	<dt><tt>llvm-x.y.tar.gz</tt></dt>
				661	<dd>Source release for the LLVM libraries and tools.<br/></dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	662
Misha Brukman	3ce1103	2005-02-02 18:01:57 +0000	[diff] [blame]	663	<dt><tt>llvm-test-x.y.tar.gz</tt></dt>
Chris Lattner	7db3f52	2005-02-09 21:15:51 +0000	[diff] [blame]	664	<dd>Source release for the LLVM test suite.</dd>
Misha Brukman	8f9e6d6	2004-11-23 19:26:24 +0000	[diff] [blame]	665
Chris Lattner	1ef81af	2006-04-20 05:08:23 +0000	[diff] [blame]	666	<dt><tt>llvm-gcc4-x.y.source.tar.gz</tt></dt>
				667	<dd>Source release of the llvm-gcc4 front end. See README.LLVM in the root
				668	directory for build instructions.<br/></dd>
				669
Tanya Lattner	f7b6be0	2006-11-20 06:04:46 +0000	[diff] [blame]	670	<dt><tt>llvm-gcc4-x.y-platform.tar.gz</tt></dt>
				671	<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]	672
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	673	</dl>
				674
Jim Laskey	6c3acb7	2006-07-31 21:37:55 +0000	[diff] [blame]	675	<p>It is also possible to download the sources of the llvm-gcc4 front end from a
				676	read-only subversion mirror at
				677	svn://anonsvn.opensource.apple.com/svn/llvm/trunk. </p>
Jim Laskey	3261f0b	2006-06-16 23:20:21 +0000	[diff] [blame]	678
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	679	</div>
				680
				681	<!-- ======================================================================= -->
				682	<div class="doc_subsection">
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	683	<a name="checkout">Checkout LLVM from Subversion</a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	684	</div>
				685
				686	<div class="doc_text">
				687
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	688	<p>If you have access to our Subversion repository, you can get a fresh copy of
				689	the entire source code. All you need to do is check it out from Subvresion as
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	690	follows:</p>
				691
				692	<ul>
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	693	<li><tt>cd <i>where-you-want-llvm-to-live</i></tt></li>
Anton Korobeynikov	98044e4	2007-06-29 20:56:49 +0000	[diff] [blame]	694	<li>Read-Only: <tt>svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm</tt></li>
				695	<li>Read-Write:<tt>svn co https://user@llvm.org/svn/llvm-project/llvm/trunk
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	696	llvm</tt></li>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	697	</ul>
				698
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	699
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	700	<p>This will create an '<tt>llvm</tt>' directory in the current
				701	directory and fully populate it with the LLVM source code, Makefiles,
				702	test directories, and local copies of documentation files.</p>
				703
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	704	<p>If you want to get a specific release (as opposed to the most recent
Anton Korobeynikov	d933fa9	2007-06-29 23:13:42 +0000	[diff] [blame]	705	revision), you can checkout it from the '<tt>tags</tt>' directory (instead of
Anton Korobeynikov	d724dc8	2007-06-30 00:00:57 +0000	[diff] [blame]	706	'<tt>trunk</tt>'). The following releases are located in the following
				707	subdirectories of the '<tt>tags</tt>' directory:</p>
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	708
John Criswell	d000e1d	2003-12-18 16:43:17 +0000	[diff] [blame]	709	<ul>
Tanya Lattner	7638565	2007-09-28 22:50:54 +0000	[diff] [blame^]	710	<li>Release 2.1: <b>RELEASE_21</b></li>
Tanya Lattner	1dcadec	2007-05-22 06:06:22 +0000	[diff] [blame]	711	<li>Release 2.0: <b>RELEASE_20</b></li>
Tanya Lattner	134693a	2006-11-20 06:07:10 +0000	[diff] [blame]	712	<li>Release 1.9: <b>RELEASE_19</b></li>
Tanya Lattner	f7b6be0	2006-11-20 06:04:46 +0000	[diff] [blame]	713	<li>Release 1.8: <b>RELEASE_18</b></li>
Tanya Lattner	993b980	2006-04-20 04:35:34 +0000	[diff] [blame]	714	<li>Release 1.7: <b>RELEASE_17</b></li>
John Criswell	c0c186d	2005-11-08 21:11:33 +0000	[diff] [blame]	715	<li>Release 1.6: <b>RELEASE_16</b></li>
John Criswell	7516255	2005-05-09 16:49:59 +0000	[diff] [blame]	716	<li>Release 1.5: <b>RELEASE_15</b></li>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	717	<li>Release 1.4: <b>RELEASE_14</b></li>
John Criswell	18b7464	2004-08-16 14:51:33 +0000	[diff] [blame]	718	<li>Release 1.3: <b>RELEASE_13</b></li>
Misha Brukman	b9be2bf	2004-05-12 19:25:59 +0000	[diff] [blame]	719	<li>Release 1.2: <b>RELEASE_12</b></li>
				720	<li>Release 1.1: <b>RELEASE_11</b></li>
				721	<li>Release 1.0: <b>RELEASE_1</b></li>
John Criswell	d000e1d	2003-12-18 16:43:17 +0000	[diff] [blame]	722	</ul>
John Criswell	d000e1d	2003-12-18 16:43:17 +0000	[diff] [blame]	723
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	724	<p>If you would like to get the LLVM test suite (a separate package as of 1.4),
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	725	you get it from the Subversion repository:</p>
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	726
				727	<div class="doc_code">
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	728	<pre>
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	729	% cd llvm/projects
				730	% svn co http://llvm.org/svn/llvm-project/test-suite/trunk llvm-test
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	731	</pre>
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	732	</div>
				733
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	734	<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]	735	configured by the LLVM configure script as well as automatically updated when
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	736	you run <tt>svn update</tt>.</p>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	737
Chris Lattner	82ad9f1	2007-03-06 06:27:34 +0000	[diff] [blame]	738	<p>If you would like to get the GCC front end source code, you can also get it
				739	and build it yourself. Please follow <a href="CFEBuildInstrs.html">these
				740	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]	741
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	742	</div>
				743
				744	<!-- ======================================================================= -->
				745	<div class="doc_subsection">
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	746	<a name="installcf">Install the GCC Front End</a>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	747	</div>
				748
				749	<div class="doc_text">
				750
Chris Lattner	bcb38cf	2007-02-14 07:33:00 +0000	[diff] [blame]	751	<p>Before configuring and compiling the LLVM suite, you can optionally extract the
				752	LLVM GCC front end from the binary distribution. It is used for running the
				753	llvm-test testsuite and for compiling C/C++ programs. Note that you can optionally
				754	<a href="CFEBuildInstrs.html">build llvm-gcc yourself</a> after building the
				755	main LLVM repository.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	756
				757	<p>To install the GCC front end, do the following:</p>
				758
				759	<ol>
				760	<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]	761	<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]	762	-</tt></li>
				763	</ol>
				764
Chris Lattner	bcb38cf	2007-02-14 07:33:00 +0000	[diff] [blame]	765	<p>Once the binary is uncompressed, you should add a symlink for llvm-gcc and
				766	llvm-g++ to some directory in your path. When you configure LLVM, it will
				767	automatically detect llvm-gcc's presence (if it is in your path) enabling its
				768	use in llvm-test. Note that you can always build or install llvm-gcc at any
				769	pointer after building the main LLVM repository: just reconfigure llvm and
				770	llvm-test will pick it up.
				771	</p>
				772
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	773	<p>The binary versions of the GCC front end may not suit all of your needs. For
				774	example, the binary distribution may include an old version of a system header
				775	file, not "fix" a header file that needs to be fixed for GCC, or it may be
				776	linked with libraries not available on your system.</p>
				777
				778	<p>In cases like these, you may want to try <a
				779	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]	780	much easier now than it was in the past.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	781
				782	</div>
				783
				784	<!-- ======================================================================= -->
				785	<div class="doc_subsection">
				786	<a name="config">Local LLVM Configuration</a>
				787	</div>
				788
				789	<div class="doc_text">
				790
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	791	<p>Once checked out from the Subversion repository, the LLVM suite source
				792	code must be
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	793	configured via the <tt>configure</tt> script. This script sets variables in the
				794	various <tt>*.in</tt> files, most notably <tt>llvm/Makefile.config</tt> and
				795	<tt>llvm/include/Config/config.h</tt>. It also populates <i>OBJ_ROOT</i> with
				796	the Makefiles needed to begin building LLVM.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	797
				798	<p>The following environment variables are used by the <tt>configure</tt>
				799	script to configure the build system:</p>
				800
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	801	<table summary="LLVM configure script environment variables">
Reid Spencer	d3f876c	2004-11-01 08:19:36 +0000	[diff] [blame]	802	<tr><th>Variable</th><th>Purpose</th></tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	803	<tr>
				804	<td>CC</td>
				805	<td>Tells <tt>configure</tt> which C compiler to use. By default,
				806	<tt>configure</tt> will look for the first GCC C compiler in
				807	<tt>PATH</tt>. Use this variable to override
				808	<tt>configure</tt>'s default behavior.</td>
				809	</tr>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	810	<tr>
				811	<td>CXX</td>
				812	<td>Tells <tt>configure</tt> which C++ compiler to use. By default,
				813	<tt>configure</tt> will look for the first GCC C++ compiler in
				814	<tt>PATH</tt>. Use this variable to override
				815	<tt>configure</tt>'s default behavior.</td>
				816	</tr>
				817	</table>
				818
				819	<p>The following options can be used to set or enable LLVM specific options:</p>
				820
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	821	<dl>
Reid Spencer	fef93b7	2004-12-26 05:47:26 +0000	[diff] [blame]	822	<dt><i>--with-llvmgccdir</i></dt>
				823	<dd>Path to the LLVM C/C++ FrontEnd to be used with this LLVM configuration.
				824	The value of this option should specify the full pathname of the C/C++ Front
				825	End to be used. If this option is not provided, the PATH will be searched for
				826	a program named <i>llvm-gcc</i> and the C/C++ FrontEnd install directory will
				827	be inferred from the path found. If the option is not given, and no llvm-gcc
				828	can be found in the path then a warning will be produced by
				829	<tt>configure</tt> indicating this situation. LLVM may still be built with
				830	the <tt>tools-only</tt> target but attempting to build the runtime libraries
				831	will fail as these libraries require llvm-gcc and llvm-g++. See
				832	<a href="#installcf">Install the GCC Front End</a> for details on installing
				833	the C/C++ Front End. See
				834	<a href="CFEBuildInstrs.html">Bootstrapping the LLVM C/C++ Front-End</a>
				835	for details on building the C/C++ Front End.</dd>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	836	<dt><i>--with-tclinclude</i></dt>
John Criswell	8bfe6a7	2005-05-18 19:43:33 +0000	[diff] [blame]	837	<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]	838	found. Use this if you have multiple tcl installations on your machine and you
				839	want to use a specific one (8.x) for LLVM. LLVM only uses tcl for running the
				840	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]	841	option, the LLVM configure script will search for the tcl 8.4 and 8.3
				842	releases.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	843	<br><br>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	844	</dd>
				845	<dt><i>--enable-optimized</i></dt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	846	<dd>
				847	Enables optimized compilation by default (debugging symbols are removed
				848	and GCC optimization flags are enabled). The default is to use an
				849	unoptimized build (also known as a debug build).
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	850	<br><br>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	851	</dd>
Reid Spencer	9d57b4d	2005-12-21 03:46:45 +0000	[diff] [blame]	852	<dt><i>--enable-debug-runtime</i></dt>
				853	<dd>
				854	Enables debug symbols in the runtime libraries. The default is to strip
				855	debug symbols from the runtime libraries.
				856	</dd>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	857	<dt><i>--enable-jit</i></dt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	858	<dd>
John Criswell	d000e1d	2003-12-18 16:43:17 +0000	[diff] [blame]	859	Compile the Just In Time (JIT) compiler functionality. This is not
				860	available
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	861	on all platforms. The default is dependent on platform, so it is best
				862	to explicitly enable it if you want it.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	863	<br><br>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	864	</dd>
Reid Spencer	2dedcf5	2005-04-22 17:58:03 +0000	[diff] [blame]	865	<dt><i>--enable-targets=</i><tt>target-option</tt></dt>
				866	<dd>Controls which targets will be built and linked into llc. The default
				867	value for <tt>target_options</tt> is "all" which builds and links all
				868	available targets. The value "host-only" can be specified to build only a
				869	native compiler (no cross-compiler targets available). The "native" target is
				870	selected as the target of the build host. You can also specify a comma
				871	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]	872	names use all lower case. The current set of targets is: <br/>
Reid Spencer	2dedcf5	2005-04-22 17:58:03 +0000	[diff] [blame]	873	<tt>alpha, ia64, powerpc, skeleton, sparc, x86</tt>.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	874	<br><br></dd>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	875	<dt><i>--enable-doxygen</i></dt>
				876	<dd>Look for the doxygen program and enable construction of doxygen based
				877	documentation from the source code. This is disabled by default because
				878	generating the documentation can take a long time and producess 100s of
				879	megabytes of output.</dd>
Anton Korobeynikov	8cea37b	2007-01-23 12:35:46 +0000	[diff] [blame]	880	<dt><i>--with-udis86</i></dt>
				881	<dd>LLVM can use external disassembler library for various purposes (now it's
				882	used only for examining code produced by JIT). This option will enable usage
				883	of <a href="http://udis86.sourceforge.net/">udis86</a> x86 (both 32 and 64
				884	bits) disassembler library.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	885	</dl>
				886
				887	<p>To configure LLVM, follow these steps:</p>
				888
				889	<ol>
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	890	<li><p>Change directory into the object root directory:</p>
John Criswell	0f6d7c0	2003-10-27 18:18:16 +0000	[diff] [blame]	891
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	892	<div class="doc_code"><pre>% cd <i>OBJ_ROOT</i></pre></div></li>
				893
				894	<li><p>Run the <tt>configure</tt> script located in the LLVM source
				895	tree:</p>
				896
				897	<div class="doc_code">
				898	<pre>% <i>SRC_ROOT</i>/configure --prefix=/install/path [other options]</pre>
				899	</div></li>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	900	</ol>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	901
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	902	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	903
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	904	<!-- ======================================================================= -->
				905	<div class="doc_subsection">
				906	<a name="compile">Compiling the LLVM Suite Source Code</a>
				907	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	908
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	909	<div class="doc_text">
John Criswell	0b45920	2003-07-08 20:35:59 +0000	[diff] [blame]	910
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	911	<p>Once you have configured LLVM, you can build it. There are three types of
				912	builds:</p>
John Criswell	0b45920	2003-07-08 20:35:59 +0000	[diff] [blame]	913
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	914	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	915	<dt>Debug Builds
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	916	<dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	917	These builds are the default when one types <tt>gmake</tt> (unless the
				918	<tt>--enable-optimized</tt> option was used during configuration). The
				919	build system will compile the tools and libraries with debugging
				920	information.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	921	<br><br>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	922
				923	<dt>Release (Optimized) Builds
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	924	<dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	925	These builds are enabled with the <tt>--enable-optimized</tt> option to
				926	<tt>configure</tt> or by specifying <tt>ENABLE_OPTIMIZED=1</tt> on the
				927	<tt>gmake</tt> command line. For these builds, the build system will
				928	compile the tools and libraries with GCC optimizations enabled and strip
				929	debugging information from the libraries and executables it generates.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	930	<br><br>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	931
				932	<dt>Profile Builds
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	933	<dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	934	These builds are for use with profiling. They compile profiling
				935	information into the code for use with programs like <tt>gprof</tt>.
				936	Profile builds must be started by specifying <tt>ENABLE_PROFILING=1</tt>
				937	on the <tt>gmake</tt> command line.
				938	</dl>
John Criswell	7a73b80	2003-06-30 21:59:07 +0000	[diff] [blame]	939
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	940	<p>Once you have LLVM configured, you can build it by entering the
				941	<i>OBJ_ROOT</i> directory and issuing the following command:</p>
John Criswell	20d2d3e	2003-10-10 14:26:14 +0000	[diff] [blame]	942
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	943	<div class="doc_code"><pre>% gmake</pre></div>
John Criswell	20d2d3e	2003-10-10 14:26:14 +0000	[diff] [blame]	944
Chris Lattner	95e9258	2004-07-18 22:32:22 +0000	[diff] [blame]	945	<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]	946	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]	947
				948	<p>
				949	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]	950	the parallel build options provided by GNU Make. For example, you could use the
				951	command:</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	952
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	953	<div class="doc_code"><pre>% gmake -j2</pre></div>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	954
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	955	<p>There are several special targets which are useful when working with the LLVM
				956	source code:</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	957
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	958	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	959	<dt><tt>gmake clean</tt>
				960	<dd>
				961	Removes all files generated by the build. This includes object files,
				962	generated C/C++ files, libraries, and executables.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	963	<br><br>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	964
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	965	<dt><tt>gmake dist-clean</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	966	<dd>
Misha Brukman	ad38e96	2004-08-21 23:40:49 +0000	[diff] [blame]	967	Removes everything that <tt>gmake clean</tt> does, but also removes files
				968	generated by <tt>configure</tt>. It attempts to return the source tree to the
				969	original state in which it was shipped.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	970	<br><br>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	971
Misha Brukman	e51c356	2004-08-23 20:25:33 +0000	[diff] [blame]	972	<dt><tt>gmake install</tt>
				973	<dd>
John Criswell	3d8ba51	2004-12-08 17:53:54 +0000	[diff] [blame]	974	Installs LLVM header files, libraries, tools, and documentation in a
				975	hierarchy
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	976	under $PREFIX, specified with <tt>./configure --prefix=[dir]</tt>, which
				977	defaults to <tt>/usr/local</tt>.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	978	<br><br>
				979
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	980	<dt><tt>gmake -C runtime install-bytecode</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	981	<dd>
Reid Spencer	7863c40	2004-11-11 07:30:27 +0000	[diff] [blame]	982	Assuming you built LLVM into $OBJDIR, when this command is run, it will
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	983	install bitcode libraries into the GCC front end's bitcode library
				984	directory. If you need to update your bitcode libraries,
Misha Brukman	ad38e96	2004-08-21 23:40:49 +0000	[diff] [blame]	985	this is the target to use once you've built them.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	986	<br><br>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	987	</dl>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	988
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	989	<p>Please see the <a href="MakefileGuide.html">Makefile Guide</a> for further
				990	details on these <tt>make</tt> targets and descriptions of other targets
				991	available.</p>
				992
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	993	<p>It is also possible to override default values from <tt>configure</tt> by
				994	declaring variables on the command line. The following are some examples:</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	995
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	996	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	997	<dt><tt>gmake ENABLE_OPTIMIZED=1</tt>
				998	<dd>
				999	Perform a Release (Optimized) build.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1000	<br><br>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1001
Reid Spencer	004ba03	2006-04-09 23:45:38 +0000	[diff] [blame]	1002	<dt><tt>gmake ENABLE_OPTIMIZED=1 DISABLE_ASSERTIONS=1</tt>
Chris Lattner	d465126	2006-03-21 01:10:57 +0000	[diff] [blame]	1003	<dd>
Reid Spencer	004ba03	2006-04-09 23:45:38 +0000	[diff] [blame]	1004	Perform a Release (Optimized) build without assertions enabled.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1005	<br><br>
Chris Lattner	d465126	2006-03-21 01:10:57 +0000	[diff] [blame]	1006
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1007	<dt><tt>gmake ENABLE_PROFILING=1</tt>
				1008	<dd>
				1009	Perform a Profiling build.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1010	<br><br>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1011
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1012	<dt><tt>gmake VERBOSE=1</tt>
				1013	<dd>
				1014	Print what <tt>gmake</tt> is doing on standard output.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1015	<br><br>
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1016
				1017	<dt><tt>gmake TOOL_VERBOSE=1</tt></dt>
				1018	<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]	1019	the standard output. This also implies <tt>VERBOSE=1</tt>.
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1020	<br><br></dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1021	</dl>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1022
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1023	<p>Every directory in the LLVM object tree includes a <tt>Makefile</tt> to build
				1024	it and any subdirectories that it contains. Entering any directory inside the
				1025	LLVM object tree and typing <tt>gmake</tt> should rebuild anything in or below
				1026	that directory that is out of date.</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1027
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1028	</div>
John Criswell	20d2d3e	2003-10-10 14:26:14 +0000	[diff] [blame]	1029
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1030	<!-- ======================================================================= -->
				1031	<div class="doc_subsection">
Reid Spencer	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	1032	<a name="cross-compile">Cross-Compiling LLVM</a>
Reid Spencer	17850ef	2006-07-27 05:43:30 +0000	[diff] [blame]	1033	</div>
				1034
				1035	<div class="doc_text">
Reid Spencer	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	1036	<p>It is possible to cross-compile LLVM. That is, you can create LLVM
				1037	executables and libraries for a platform different than the one one which you
				1038	are compiling. To do this, a few additional steps are
				1039	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]	1040	these instructions:</p>
				1041	<ol>
Reid Spencer	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	1042	<li>Configure and build LLVM as a native compiler. You will need
Reid Spencer	17850ef	2006-07-27 05:43:30 +0000	[diff] [blame]	1043	just <tt>TableGen</tt> from that build.
				1044	<ul>
				1045	<li>If you have <tt>$LLVM_OBJ_ROOT=$LLVM_SRC_ROOT</tt> just execute
				1046	<tt>make -C utils/TableGen</tt> after configuring.</li>
				1047	<li>Otherwise you will need to monitor building process and terminate
				1048	it just after <tt>TableGen</tt> was built.</li>
				1049	</ul>
				1050	</li>
				1051	<li>Copy the TableGen binary to somewhere safe (out of your build tree).
				1052	</li>
Reid Spencer	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	1053	<li>Configure LLVM to build with a cross-compiler. To do this, supply the
Reid Spencer	17850ef	2006-07-27 05:43:30 +0000	[diff] [blame]	1054	configure script with <tt>--build</tt> and <tt>--host</tt> options that
Reid Spencer	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	1055	are different. The values of these options must be legal target triples
				1056	that your GCC compiler supports.</li>
Reid Spencer	17850ef	2006-07-27 05:43:30 +0000	[diff] [blame]	1057	<li>Put the saved <tt>TableGen</tt> executable into the
				1058	into <tt>$LLVM_OBJ_ROOT/{BUILD_TYPE}/bin</tt> directory (e.g. into
				1059	<tt>.../Release/bin</tt> for a Release build).</li>
				1060	<li>Build LLVM as usual.</li>
				1061	</ol>
Reid Spencer	d30a971	2006-07-27 06:41:31 +0000	[diff] [blame]	1062	<p>The result of such a build will produce executables that are not executable
				1063	on your build host (--build option) but can be executed on your compile host
				1064	(--host option).</p>
Reid Spencer	17850ef	2006-07-27 05:43:30 +0000	[diff] [blame]	1065	<p><b>Notes:</b></p>
				1066	<div class="doc_notes">
				1067	<ol>
				1068	<li><a name="ccn_1">Cross-compiling</a> was tested only with Linux as
				1069	build platform and Windows as host using mingw32 cross-compiler. Other
				1070	combinations have not been tested.</li>
				1071	</ol>
				1072	</div>
				1073	</div>
				1074
				1075	<!-- ======================================================================= -->
				1076	<div class="doc_subsection">
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1077	<a name="objfiles">The Location of LLVM Object Files</a>
				1078	</div>
John Criswell	20d2d3e	2003-10-10 14:26:14 +0000	[diff] [blame]	1079
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1080	<div class="doc_text">
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1081
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1082	<p>The LLVM build system is capable of sharing a single LLVM source tree among
				1083	several LLVM builds. Hence, it is possible to build LLVM for several different
				1084	platforms or configurations using the same source tree.</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1085
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1086	<p>This is accomplished in the typical autoconf manner:</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1087
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1088	<ul>
				1089	<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]	1090
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1091	<div class="doc_code"><pre>% cd <i>OBJ_ROOT</i></pre></div></li>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1092
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1093	<li><p>Run the <tt>configure</tt> script found in the LLVM source
				1094	directory:</p>
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1095
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1096	<div class="doc_code"><pre>% <i>SRC_ROOT</i>/configure</pre></div></li>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1097	</ul>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1098
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1099	<p>The LLVM build will place files underneath <i>OBJ_ROOT</i> in directories
				1100	named after the build type:</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1101
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>Debug Builds
				1104	<dd>
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1105	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1106	<dt>Tools
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1107	<dd><tt><i>OBJ_ROOT</i>/Debug/bin</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1108	<dt>Libraries
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1109	<dd><tt><i>OBJ_ROOT</i>/Debug/lib</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1110	</dl>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1111	<br><br>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1112
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1113	<dt>Release Builds
				1114	<dd>
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1115	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1116	<dt>Tools
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1117	<dd><tt><i>OBJ_ROOT</i>/Release/bin</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1118	<dt>Libraries
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1119	<dd><tt><i>OBJ_ROOT</i>/Release/lib</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1120	</dl>
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1121	<br><br>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1122
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1123	<dt>Profile Builds
				1124	<dd>
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1125	<dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1126	<dt>Tools
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1127	<dd><tt><i>OBJ_ROOT</i>/Profile/bin</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1128	<dt>Libraries
Reid Spencer	66db92e	2004-12-08 16:51:31 +0000	[diff] [blame]	1129	<dd><tt><i>OBJ_ROOT</i>/Profile/lib</tt>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1130	</dl>
				1131	</dl>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1132
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1133	</div>
Chris Lattner	7fe7f81	2002-07-24 19:51:14 +0000	[diff] [blame]	1134
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	1135	<!-- ======================================================================= -->
				1136	<div class="doc_subsection">
				1137	<a name="optionalconfig">Optional Configuration Items</a>
				1138	</div>
				1139
				1140	<div class="doc_text">
				1141
				1142	<p>
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	1143	If you're running on a Linux system that supports the "<a
Bill Wendling	22e37c3	2007-07-16 08:46:40 +0000	[diff] [blame]	1144	href="http://www.tat.physik.uni-tuebingen.de/~rguenth/linux/binfmt_misc.html">binfmt_misc</a>"
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	1145	module, and you have root access on the system, you can set your system up to
Bill Wendling	22e37c3	2007-07-16 08:46:40 +0000	[diff] [blame]	1146	execute LLVM bitcode files directly. To do this, use commands like this (the
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	1147	first command may not be required if you are already using the module):</p>
				1148
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	1149	<div class="doc_code">
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	1150	<pre>
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1151	$ mount -t binfmt_misc none /proc/sys/fs/binfmt_misc
				1152	$ echo ':llvm:M::llvm::/path/to/lli:' > /proc/sys/fs/binfmt_misc/register
				1153	$ chmod u+x hello.bc (if needed)
				1154	$ ./hello.bc
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	1155	</pre>
Misha Brukman	9106eca	2005-02-03 22:25:23 +0000	[diff] [blame]	1156	</div>
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	1157
				1158	<p>
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1159	This allows you to execute LLVM bitcode files directly. Thanks to Jack
Chris Lattner	a553f62	2004-03-25 20:38:40 +0000	[diff] [blame]	1160	Cummings for pointing this out!
				1161	</p>
				1162
				1163	</div>
				1164
				1165
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1166	<!-- *********************************************************************** -->
				1167	<div class="doc_section">
				1168	<a name="layout"><b>Program Layout</b></a>
				1169	</div>
				1170	<!-- *********************************************************************** -->
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1171
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1172	<div class="doc_text">
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1173
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1174	<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]	1175	href="http://www.doxygen.org">doxygen</a> documentation available at <tt><a
Reid Spencer	05fe4b0	2006-03-14 05:39:39 +0000	[diff] [blame]	1176	href="http://llvm.org/doxygen/">http://llvm.org/doxygen/</a></tt>.
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1177	The following is a brief introduction to code layout:</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1178
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1179	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1180
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1181	<!-- ======================================================================= -->
Reid Spencer	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	1182	<div class="doc_subsection"><a name="examples"><tt>llvm/examples</tt></a></div>
				1183	<div class="doc_text">
				1184	<p>This directory contains some simple examples of how to use the LLVM IR and
				1185	JIT.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1186	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1187
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1188	<!-- ======================================================================= -->
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1189	<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]	1190	<div class="doc_text">
				1191
				1192	<p>This directory contains public header files exported from the LLVM
				1193	library. The three main subdirectories of this directory are:</p>
				1194
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1195	<dl>
				1196	<dt><tt><b>llvm/include/llvm</b></tt></dt>
				1197	<dd>This directory contains all of the LLVM specific header files. This
				1198	directory also has subdirectories for different portions of LLVM:
				1199	<tt>Analysis</tt>, <tt>CodeGen</tt>, <tt>Target</tt>, <tt>Transforms</tt>,
				1200	etc...</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1201
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1202	<dt><tt><b>llvm/include/llvm/Support</b></tt></dt>
				1203	<dd>This directory contains generic support libraries that are provided with
				1204	LLVM but not necessarily specific to LLVM. For example, some C++ STL utilities
				1205	and a Command Line option processing library store their header files here.
				1206	</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1207
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1208	<dt><tt><b>llvm/include/llvm/Config</b></tt></dt>
				1209	<dd>This directory contains header files configured by the <tt>configure</tt>
				1210	script. They wrap "standard" UNIX and C header files. Source code can
				1211	include these header files which automatically take care of the conditional
				1212	#includes that the <tt>configure</tt> script generates.</dd>
				1213	</dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1214	</div>
				1215
				1216	<!-- ======================================================================= -->
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1217	<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]	1218	<div class="doc_text">
				1219
				1220	<p>This directory contains most of the source files of the LLVM system. In LLVM,
				1221	almost all code exists in libraries, making it very easy to share code among the
				1222	different <a href="#tools">tools</a>.</p>
				1223
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1224	<dl>
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1225	<dt><tt><b>llvm/lib/VMCore/</b></tt></dt>
				1226	<dd> This directory holds the core LLVM source files that implement core
				1227	classes like Instruction and BasicBlock.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1228
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1229	<dt><tt><b>llvm/lib/AsmParser/</b></tt></dt>
				1230	<dd>This directory holds the source code for the LLVM assembly language parser
				1231	library.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1232
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1233	<dt><tt><b>llvm/lib/BitCode/</b></tt></dt>
				1234	<dd>This directory holds code for reading and write LLVM bitcode.</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/Analysis/</b></tt><dd>This directory contains a variety of
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1237	different program analyses, such as Dominator Information, Call Graphs,
				1238	Induction Variables, Interval Identification, Natural Loop Identification,
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1239	etc.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1240
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1241	<dt><tt><b>llvm/lib/Transforms/</b></tt></dt>
				1242	<dd> This directory contains the source code for the LLVM to LLVM program
				1243	transformations, such as Aggressive Dead Code Elimination, Sparse Conditional
				1244	Constant Propagation, Inlining, Loop Invariant Code Motion, Dead Global
				1245	Elimination, and many others.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1246
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1247	<dt><tt><b>llvm/lib/Target/</b></tt></dt>
				1248	<dd> This directory contains files that describe various target architectures
Chris Lattner	2a60703	2006-04-20 17:42:23 +0000	[diff] [blame]	1249	for code generation. For example, the <tt>llvm/lib/Target/X86</tt>
				1250	directory holds the X86 machine description while
John Criswell	8bfe6a7	2005-05-18 19:43:33 +0000	[diff] [blame]	1251	<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]	1252
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1253	<dt><tt><b>llvm/lib/CodeGen/</b></tt></dt>
				1254	<dd> This directory contains the major parts of the code generator: Instruction
				1255	Selector, Instruction Scheduling, and Register Allocation.</dd>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1256
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1257	<dt><tt><b>llvm/lib/Debugger/</b></tt></dt>
				1258	<dd> This directory contains the source level debugger library that makes
				1259	it possible to instrument LLVM programs so that a debugger could identify
				1260	source code locations at which the program is executing.</dd>
				1261
				1262	<dt><tt><b>llvm/lib/ExecutionEngine/</b></tt></dt>
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1263	<dd> This directory contains libraries for executing LLVM bitcode directly
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1264	at runtime in both interpreted and JIT compiled fashions.</dd>
				1265
				1266	<dt><tt><b>llvm/lib/Support/</b></tt></dt>
				1267	<dd> This directory contains the source code that corresponds to the header
				1268	files located in <tt>llvm/include/Support/</tt>.</dd>
				1269
				1270	<dt><tt><b>llvm/lib/System/</b></tt></dt>
				1271	<dd>This directory contains the operating system abstraction layer that
				1272	shields LLVM from platform-specific coding.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1273	</dl>
John Criswell	7a73b80	2003-06-30 21:59:07 +0000	[diff] [blame]	1274
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1275	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1276
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1277	<!-- ======================================================================= -->
Reid Spencer	c4b09ba	2004-12-08 16:18:26 +0000	[diff] [blame]	1278	<div class="doc_subsection"><a name="projects"><tt>llvm/projects</tt></a></div>
				1279	<div class="doc_text">
				1280	<p>This directory contains projects that are not strictly part of LLVM but are
				1281	shipped with LLVM. This is also the directory where you should create your own
				1282	LLVM-based projects. See <tt>llvm/projects/sample</tt> for an example of how
				1283	to set up your own project. See <tt>llvm/projects/Stacker</tt> for a fully
				1284	functional example of a compiler front end.</p>
				1285	</div>
				1286
				1287	<!-- ======================================================================= -->
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1288	<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]	1289	<div class="doc_text">
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1290
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1291	<p>This directory contains libraries which are compiled into LLVM bitcode and
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1292	used when linking programs with the GCC front end. Most of these libraries are
				1293	skeleton versions of real libraries; for example, libc is a stripped down
				1294	version of glibc.</p>
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	<p>Unlike the rest of the LLVM suite, this directory needs the LLVM GCC front
				1297	end to compile.</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1298
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1299	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1300
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1301	<!-- ======================================================================= -->
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1302	<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]	1303	<div class="doc_text">
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1304	<p>This directory contains feature and regression tests and other basic sanity
				1305	checks on the LLVM infrastructure. These are intended to run quickly and cover
				1306	a lot of territory without being exhaustive.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1307	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1308
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1309	<!-- ======================================================================= -->
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	1310	<div class="doc_subsection"><a name="llvmtest"><tt>test-suite</tt></a></div>
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1311	<div class="doc_text">
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	1312	<p>This is not a directory in the normal llvm module; it is a separate
				1313	Subversion
				1314	module that must be checked out (usually to <tt>projects/test-suite</tt>).
				1315	This
John Criswell	3d8ba51	2004-12-08 17:53:54 +0000	[diff] [blame]	1316	module contains a comprehensive correctness, performance, and benchmarking
				1317	test
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	1318	suite for LLVM. It is a separate Subversion module because not every LLVM
				1319	user is
John Criswell	838bce5	2005-05-09 16:39:27 +0000	[diff] [blame]	1320	interested in downloading or building such a comprehensive test suite. For
				1321	further details on this test suite, please see the
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1322	<a href="TestingGuide.html">Testing Guide</a> document.</p>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1323	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1324
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1325	<!-- ======================================================================= -->
				1326	<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]	1327	<div class="doc_text">
John Criswell	20d2d3e	2003-10-10 14:26:14 +0000	[diff] [blame]	1328
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1329	<p>The <b>tools</b> directory contains the executables built out of the
				1330	libraries above, which form the main part of the user interface. You can
				1331	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]	1332	following is a brief introduction to the most important tools. More detailed
				1333	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]	1334
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1335	<dl>
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>bugpoint</b></tt></dt>
				1338	<dd><tt>bugpoint</tt> is used to debug
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1339	optimization passes or code generation backends by narrowing down the
				1340	given test case to the minimum number of passes and/or instructions that
				1341	still cause a problem, whether it is a crash or miscompilation. See <a
				1342	href="HowToSubmitABug.html">HowToSubmitABug.html</a> for more information
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1343	on using <tt>bugpoint</tt>.</dd>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1344
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1345	<dt><tt><b>llvmc</b></tt></dt>
				1346	<dd>The LLVM Compiler Driver. This program can
				1347	be configured to utilize both LLVM and non-LLVM compilation tools to enable
				1348	pre-processing, translation, optimization, assembly, and linking of programs
				1349	all from one command line. <tt>llvmc</tt> also takes care of processing the
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1350	dependent libraries found in bitcode. This reduces the need to get the
Reid Spencer	079e945	2004-12-08 18:00:30 +0000	[diff] [blame]	1351	traditional <tt>-l<name></tt> options right on the command line. Please
John Criswell	8bfe6a7	2005-05-18 19:43:33 +0000	[diff] [blame]	1352	note that this tool, while functional, is still experimental and not feature
				1353	complete.</dd>
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1354
				1355	<dt><tt><b>llvm-ar</b></tt></dt>
				1356	<dd>The archiver produces an archive containing
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1357	the given LLVM bitcode files, optionally with an index for faster
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1358	lookup.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1359
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1360	<dt><tt><b>llvm-as</b></tt></dt>
				1361	<dd>The assembler transforms the human readable LLVM assembly to LLVM
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1362	bitcode.</dd>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1363
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1364	<dt><tt><b>llvm-dis</b></tt></dt>
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1365	<dd>The disassembler transforms the LLVM bitcode to human readable
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1366	LLVM assembly.</dd>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1367
Reid Spencer	079e945	2004-12-08 18:00:30 +0000	[diff] [blame]	1368	<dt><tt><b>llvm-ld</b></tt></dt>
Reid Spencer	434262a	2007-02-09 15:59:08 +0000	[diff] [blame]	1369	<dd><tt>llvm-ld</tt> is a general purpose and extensible linker for LLVM.
				1370	This is the linker invoked by <tt>llvmc</tt>. It performsn standard link time
				1371	optimizations and allows optimization modules to be loaded and run so that
				1372	language specific optimizations can be applied at link time.</dd>
Reid Spencer	079e945	2004-12-08 18:00:30 +0000	[diff] [blame]	1373
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1374	<dt><tt><b>llvm-link</b></tt></dt>
				1375	<dd><tt>llvm-link</tt>, not surprisingly, links multiple LLVM modules into
				1376	a single program.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1377
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1378	<dt><tt><b>lli</b></tt></dt>
				1379	<dd><tt>lli</tt> is the LLVM interpreter, which
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1380	can directly execute LLVM bitcode (although very slowly...). In addition
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1381	to a simple interpreter, <tt>lli</tt> also has a tracing mode (entered by
				1382	specifying <tt>-trace</tt> on the command line). Finally, for
John Criswell	d9eceee	2004-12-08 18:04:14 +0000	[diff] [blame]	1383	architectures that support it (currently x86, Sparc, and PowerPC), by default,
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1384	<tt>lli</tt> will function as a Just-In-Time compiler (if the
				1385	functionality was compiled in), and will execute the code <i>much</i>
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1386	faster than the interpreter.</dd>
Misha Brukman	ef0ad41	2003-10-06 19:23:34 +0000	[diff] [blame]	1387
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1388	<dt><tt><b>llc</b></tt></dt>
				1389	<dd> <tt>llc</tt> is the LLVM backend compiler, which
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1390	translates LLVM bitcode to a native code assembly file or to C code (with
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1391	the -march=c option).</dd>
Misha Brukman	ef0ad41	2003-10-06 19:23:34 +0000	[diff] [blame]	1392
Reid Spencer	d4694f9	2004-12-22 06:29:07 +0000	[diff] [blame]	1393	<dt><tt><b>llvm-gcc</b></tt></dt>
Reid Spencer	434262a	2007-02-09 15:59:08 +0000	[diff] [blame]	1394	<dd><tt>llvm-gcc</tt> is a GCC-based C frontend that has been retargeted to
				1395	use LLVM as its backend instead of GCC's RTL backend. It can also emit LLVM
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1396	bitcode or assembly (with the <tt>-emit-llvm</tt> option) instead of the
Reid Spencer	434262a	2007-02-09 15:59:08 +0000	[diff] [blame]	1397	usual machine code output. It works just like any other GCC compiler,
				1398	taking the typical <tt>-c, -S, -E, -o</tt> options that are typically used.
				1399	Additionally, the the source code for <tt>llvm-gcc</tt> is available as a
John Criswell	9c29bfb	2007-06-29 19:12:31 +0000	[diff] [blame]	1400	separate Subversion module.</dd>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1401
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1402	<dt><tt><b>opt</b></tt></dt>
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1403	<dd><tt>opt</tt> reads LLVM bitcode, applies a series of LLVM to LLVM
Reid Spencer	84f82f7	2006-08-28 00:34:19 +0000	[diff] [blame]	1404	transformations (which are specified on the command line), and then outputs
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1405	the resultant bitcode. The '<tt>opt --help</tt>' command is a good way to
Reid Spencer	84f82f7	2006-08-28 00:34:19 +0000	[diff] [blame]	1406	get a list of the program transformations available in LLVM.<br/>
				1407	<dd><tt>opt</tt> can also be used to run a specific analysis on an input
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1408	LLVM bitcode file and print out the results. It is primarily useful for
Reid Spencer	84f82f7	2006-08-28 00:34:19 +0000	[diff] [blame]	1409	debugging analyses, or familiarizing yourself with what an analysis does.</dd>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1410	</dl>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1411	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1412
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1413	<!-- ======================================================================= -->
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1414	<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]	1415	<div class="doc_text">
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1416
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1417	<p>This directory contains utilities for working with LLVM source code, and some
				1418	of the utilities are actually required as part of the build process because they
				1419	are code generators for parts of LLVM infrastructure.</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1420
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1421	<dl>
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1422	<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]	1423	that finds differences between code that LLC generates and code that LLI
				1424	generates. This is a useful tool if you are debugging one of them,
				1425	assuming that the other generates correct output. For the full user
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	1426	manual, run <tt>`perldoc codegen-diff'</tt>.<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>
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1498	create bitcode by default: <i>gcc4</i> produces native code. As the example below illustrates,
				1499	the '--emit-llvm' flag is needed to produce LLVM bitcode output. For <i>makefiles</i> and
				1500	<i>configure</i> scripts, the CFLAGS variable needs '--emit-llvm' to produce bitcode
Chris Lattner	9abd8af	2006-09-07 04:19:09 +0000	[diff] [blame]	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>
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1510	<li><p>First, create a simple C file, name it 'hello.c':</p>
				1511
				1512	<div class="doc_code">
				1513	<pre>
				1514	#include <stdio.h>
				1515
				1516	int main() {
				1517	printf("hello world\n");
				1518	return 0;
				1519	}
				1520	</pre></div></li>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1521
				1522	<li><p>Next, compile the C file into a native executable:</p>
				1523
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1524	<div class="doc_code"><pre>% llvm-gcc hello.c -o hello</pre></div>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1525
				1526	<p>Note that llvm-gcc works just like GCC by default. The standard -S and
				1527	-c arguments work as usual (producing a native .s or .o file,
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1528	respectively).</p></li>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1529
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1530	<li><p>Next, compile the C file into a LLVM bitcode file:</p>
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1531
				1532	<div class="doc_code">
				1533	<pre>% llvm-gcc -O3 -emit-llvm hello.c -c -o hello.bc</pre></div>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1534
				1535	<p>The -emit-llvm option can be used with the -S or -c options to emit an
				1536	LLVM ".ll" or ".bc" file (respectively) for the code. This allows you
				1537	to use the <a href="CommandGuide/index.html">standard LLVM tools</a> on
Gabor Greif	04367bf	2007-07-06 22:07:22 +0000	[diff] [blame]	1538	the bitcode file.</p>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1539
				1540	<p>Unlike llvm-gcc3, llvm-gcc4 correctly responds to -O[0123] arguments.
				1541	</p></li>
				1542
				1543	<li><p>Run the program in both forms. To run the program, use:</p>
				1544
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1545	<div class="doc_code"><pre>% ./hello</pre></div>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1546
				1547	<p>and</p>
				1548
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1549	<div class="doc_code"><pre>% lli hello.bc</pre></div>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1550
				1551	<p>The second examples shows how to invoke the LLVM JIT, <a
Chris Lattner	6e3b7c2	2006-08-14 20:51:35 +0000	[diff] [blame]	1552	href="CommandGuide/html/lli.html">lli</a>.</p></li>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1553
				1554	<li><p>Use the <tt>llvm-dis</tt> utility to take a look at the LLVM assembly
				1555	code:</p>
				1556
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1557	<div class="doc_code">
				1558	<pre>llvm-dis < hello.bc \| less</pre>
				1559	</div></li>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1560
				1561	<li><p>Compile the program to native assembly using the LLC code
				1562	generator:</p>
				1563
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1564	<div class="doc_code"><pre>% llc hello.bc -o hello.s</pre></div></li>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1565
				1566	<li><p>Assemble the native assembly language file into a program:</p>
				1567
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1568	<div class="doc_code">
				1569	<pre>
				1570	<b>Solaris:</b> % /opt/SUNWspro/bin/cc -xarch=v9 hello.s -o hello.native
				1571
				1572	<b>Others:</b> % gcc hello.s -o hello.native
				1573	</pre>
				1574	</div></li>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1575
				1576	<li><p>Execute the native code program:</p>
				1577
Bill Wendling	77f7469	2007-07-16 08:44:39 +0000	[diff] [blame]	1578	<div class="doc_code"><pre>% ./hello.native</pre></div>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1579
				1580	<p>Note that using llvm-gcc to compile directly to native code (i.e. when
				1581	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]	1582	</li>
Chris Lattner	5907d40	2006-08-14 20:45:25 +0000	[diff] [blame]	1583
				1584	</ol>
				1585
				1586	</div>
				1587
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	<!-- *********************************************************************** -->
				1590	<div class="doc_section">
				1591	<a name="problems">Common Problems</a>
				1592	</div>
				1593	<!-- *********************************************************************** -->
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1594
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1595	<div class="doc_text">
John Criswell	ce760f6	2003-07-03 16:01:38 +0000	[diff] [blame]	1596
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1597	<p>If you are having problems building or using LLVM, or if you have any other
				1598	general questions about LLVM, please consult the <a href="FAQ.html">Frequently
				1599	Asked Questions</a> page.</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1600
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1601	</div>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1602
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1603	<!-- *********************************************************************** -->
				1604	<div class="doc_section">
				1605	<a name="links">Links</a>
				1606	</div>
				1607	<!-- *********************************************************************** -->
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1608
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1609	<div class="doc_text">
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1610
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1611	<p>This document is just an <b>introduction</b> to how to use LLVM to do
				1612	some simple things... there are many more interesting and complicated things
				1613	that you can do that aren't documented here (but we'll gladly accept a patch
				1614	if you want to write something up!). For more information about LLVM, check
				1615	out:</p>
John Criswell	85ed361	2003-06-12 19:34:44 +0000	[diff] [blame]	1616
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1617	<ul>
Reid Spencer	05fe4b0	2006-03-14 05:39:39 +0000	[diff] [blame]	1618	<li><a href="http://llvm.org/">LLVM homepage</a></li>
				1619	<li><a href="http://llvm.org/doxygen/">LLVM doxygen tree</a></li>
				1620	<li><a href="http://llvm.org/docs/Projects.html">Starting a Project
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1621	that Uses LLVM</a></li>
				1622	</ul>
				1623
				1624	</div>
				1625
				1626	<!-- *********************************************************************** -->
				1627
				1628	<hr>
Misha Brukman	142207b	2003-11-22 01:30:01 +0000	[diff] [blame]	1629	<address>
Misha Brukman	54111c4	2004-01-20 00:20:17 +0000	[diff] [blame]	1630	<a href="http://jigsaw.w3.org/css-validator/check/referer"><img
				1631	src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
				1632	<a href="http://validator.w3.org/check/referer"><img
				1633	src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
				1634
Misha Brukman	142207b	2003-11-22 01:30:01 +0000	[diff] [blame]	1635	<a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
Reid Spencer	77d9019	2004-09-05 20:50:22 +0000	[diff] [blame]	1636	<a href="http://llvm.x10sys.com/rspencer/">Reid Spencer</a><br>
Reid Spencer	05fe4b0	2006-03-14 05:39:39 +0000	[diff] [blame]	1637	<a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1638	Last modified: $Date$
Misha Brukman	142207b	2003-11-22 01:30:01 +0000	[diff] [blame]	1639	</address>
Misha Brukman	00c73d2	2003-11-07 19:43:14 +0000	[diff] [blame]	1640	</body>
Guochun Shi	f4688a8	2002-07-17 23:05:56 +0000	[diff] [blame]	1641	</html>