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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 43eb96c3ef62c69ccec13e7326a5660a74483f04 / . / docs / GettingStarted.html
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Guochun Shif4688a82002-07-17 23:05:56 +0000[diff] [blame]3<html>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]4<head>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman00c73d22003-11-07 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 Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]10
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]11<div class="doc_title">
12 Getting Started with the LLVM System
13</div>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]14
Misha Brukman00c73d22003-11-07 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 Lattner96768ea2003-02-14 04:22:13 +0000[diff] [blame]19 <ol>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]20 <li><a href="#hardware">Hardware</a>
21 <li><a href="#software">Software</a>
Chris Lattner95e92582004-07-18 22:32:22 +0000[diff] [blame]22 <li><a href="#brokengcc">Broken versions of GCC</a>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]23 </ol></li>
John Criswell7a73b802003-06-30 21:59:07 +0000[diff] [blame]24
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]25 <li><a href="#starting">Getting Started with LLVM</a>
John Criswell0b459202003-07-08 20:35:59 +0000[diff] [blame]26 <ol>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]27 <li><a href="#terminology">Terminology and Notation</a>
28 <li><a href="#environment">Setting Up Your Environment</a>
29 <li><a href="#unpack">Unpacking the LLVM Archives</a>
30 <li><a href="#checkout">Checkout LLVM from CVS</a>
31 <li><a href="#installcf">Install the GCC Front End</a>
32 <li><a href="#config">Local LLVM Configuration</a>
33 <li><a href="#compile">Compiling the LLVM Suite Source Code</a>
Reid Spencerd30a9712006-07-27 06:41:31 +0000[diff] [blame]34 <li><a href="#cross-compile">Cross-Compiling LLVM</a>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]35 <li><a href="#objfiles">The Location of LLVM Object Files</a>
Chris Lattnera553f622004-03-25 20:38:40 +0000[diff] [blame]36 <li><a href="#optionalconfig">Optional Configuration Items</a>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]37 </ol></li>
John Criswell0b459202003-07-08 20:35:59 +0000[diff] [blame]38
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]39 <li><a href="#layout">Program layout</a>
40 <ol>
41 <li><a href="#cvsdir"><tt>CVS</tt> directories</a>
Reid Spencerc4b09ba2004-12-08 16:18:26 +0000[diff] [blame]42 <li><a href="#examples"><tt>llvm/examples</tt></a>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]43 <li><a href="#include"><tt>llvm/include</tt></a>
44 <li><a href="#lib"><tt>llvm/lib</tt></a>
Reid Spencerc4b09ba2004-12-08 16:18:26 +0000[diff] [blame]45 <li><a href="#projects"><tt>llvm/projects</tt></a>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]46 <li><a href="#runtime"><tt>llvm/runtime</tt></a>
47 <li><a href="#test"><tt>llvm/test</tt></a>
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]48 <li><a href="#llvmtest"><tt>llvm-test</tt></a>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]49 <li><a href="#tools"><tt>llvm/tools</tt></a>
50 <li><a href="#utils"><tt>llvm/utils</tt></a>
Reid Spencerc4b09ba2004-12-08 16:18:26 +0000[diff] [blame]51 <li><a href="#win32"><tt>llvm/win32</tt></a>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]52 </ol></li>
John Criswell0f6d7c02003-10-27 18:18:16 +0000[diff] [blame]53
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]54 <li><a href="#tutorial">An Example Using the LLVM Tool Chain</a>
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]55 <ol>
56 <li><a href="#tutorial4">Example with llvm-gcc4</a></li>
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]57 </ol>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]58 <li><a href="#problems">Common Problems</a>
59 <li><a href="#links">Links</a>
60</ul>
61
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]62<div class="doc_author">
63 <p>Written by:
64 <a href="mailto:criswell@uiuc.edu">John Criswell</a>,
65 <a href="mailto:sabre@nondot.org">Chris Lattner</a>,
66 <a href="http://misha.brukman.net">Misha Brukman</a>,
67 <a href="http://www.cs.uiuc.edu/~vadve">Vikram Adve</a>, and
68 <a href="mailto:gshi1@uiuc.edu">Guochun Shi</a>.
69 </p>
70</div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]71
72
73<!-- *********************************************************************** -->
74<div class="doc_section">
75 <a name="overview"><b>Overview</b></a>
76</div>
77<!-- *********************************************************************** -->
78
79<div class="doc_text">
80
81<p>Welcome to LLVM! In order to get started, you first need to know some
82basic information.</p>
83
84<p>First, LLVM comes in two pieces. The first piece is the LLVM suite. This
85contains all of the tools, libraries, and header files needed to use the low
86level virtual machine. It contains an assembler, disassembler, bytecode
Reid Spencer84f82f72006-08-28 00:34:19 +0000[diff] [blame]87analyzer and bytecode optimizer. It also contains a test suite that can be
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]88used to test the LLVM tools and the GCC front end.</p>
89
90<p>The second piece is the GCC front end. This component provides a version of
91GCC that compiles C and C++ code into LLVM bytecode. Currently, the GCC front
92end is a modified version of GCC 3.4 (we track the GCC 3.4 development). Once
93compiled into LLVM bytecode, a program can be manipulated with the LLVM tools
94from the LLVM suite.</p>
95
John Criswell3d8ba512004-12-08 17:53:54 +0000[diff] [blame]96<p>
97There is a third, optional piece called llvm-test. It is a suite of programs
98with a testing harness that can be used to further test LLVM's functionality
99and performance.
100</p>
101
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]102</div>
103
104<!-- *********************************************************************** -->
105<div class="doc_section">
106 <a name="quickstart"><b>Getting Started Quickly (A Summary)</b></a>
107</div>
108<!-- *********************************************************************** -->
109
110<div class="doc_text">
111
112<p>Here's the short story for getting up and running quickly with LLVM:</p>
113
114<ol>
Reid Spencer9f547912004-11-08 00:29:22 +0000[diff] [blame]115 <li>Read the documentation.</li>
116 <li>Read the documentation.</li>
117 <li>Remember that you were warned twice about reading the documentation.</li>
Misha Brukman9106eca2005-02-03 22:25:23 +0000[diff] [blame]118 <li>Install the GCC front end if you intend to compile C or C++:
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]119 <ol>
Reid Spencerd4694f92004-12-22 06:29:07 +0000[diff] [blame]120 <li><tt>cd <i>where-you-want-the-C-front-end-to-live</i></tt></li>
Tanya Lattnerf7b6be02006-11-20 06:04:46 +0000[diff] [blame]121 <li><tt>gunzip --stdout llvm-gcc.<i>platform</i>.tar.gz | tar -xvf -</tt>
Reid Spencerd4694f92004-12-22 06:29:07 +0000[diff] [blame]122 </li>
Tanya Lattnerf7b6be02006-11-20 06:04:46 +0000[diff] [blame]123 <li><tt>cd llvm-gcc3.4/<i>platform</i> (llvm-gcc3.4 only)<br>
Reid Spencerd4694f92004-12-22 06:29:07 +0000[diff] [blame]124 ./fixheaders</tt></li>
Tanya Lattnerf7b6be02006-11-20 06:04:46 +0000[diff] [blame]125 <li>Add llvm-gcc's "bin" directory to your PATH variable.</li>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]126 </ol></li>
127
Misha Brukman9106eca2005-02-03 22:25:23 +0000[diff] [blame]128 <li>Get the LLVM Source Code
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]129 <ul>
Misha Brukman9106eca2005-02-03 22:25:23 +0000[diff] [blame]130 <li>With the distributed files (or use <a href="#checkout">CVS</a>):
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]131 <ol>
132 <li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
John Criswell364cec42004-03-12 20:31:37 +0000[diff] [blame]133 <li><tt>gunzip --stdout llvm-<i>version</i>.tar.gz | tar -xvf -</tt>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]134 </ol></li>
135
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]136 </ul></li>
137
Misha Brukman9106eca2005-02-03 22:25:23 +0000[diff] [blame]138 <li><b>[Optional]</b> Get the Test Suite Source Code
John Criswell9e2485c2004-12-10 15:51:16 +0000[diff] [blame]139 <ul>
Misha Brukman9106eca2005-02-03 22:25:23 +0000[diff] [blame]140 <li>With the distributed files (or use <a href="#checkout">CVS</a>):
John Criswell9e2485c2004-12-10 15:51:16 +0000[diff] [blame]141 <ol>
142 <li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
143 <li><tt>cd llvm/projects</tt>
144 <li><tt>gunzip --stdout llvm-test-<i>version</i>.tar.gz | tar -xvf -</tt>
John Criswell9e2485c2004-12-10 15:51:16 +0000[diff] [blame]145 </ol></li>
146
John Criswell9e2485c2004-12-10 15:51:16 +0000[diff] [blame]147 </ul></li>
148
149
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]150 <li>Configure the LLVM Build Environment
151 <ol>
Misha Brukman9106eca2005-02-03 22:25:23 +0000[diff] [blame]152 <li><tt>cd <i>where-you-want-to-build-llvm</i></tt></li>
153 <li><tt><i>/path/to/llvm/</i>configure [options]</tt><br>
154 Some common options:
155
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]156 <ul>
Reid Spencerd4694f92004-12-22 06:29:07 +0000[diff] [blame]157 <li><tt>--prefix=<i>directory</i></tt>
158 <p>Specify for <i>directory</i> the full pathname of where you
Misha Brukman9106eca2005-02-03 22:25:23 +0000[diff] [blame]159 want the LLVM tools and libraries to be installed (default
160 <tt>/usr/local</tt>).</p></li>
Reid Spencerfef93b72004-12-26 05:47:26 +0000[diff] [blame]161 <li><tt>--with-llvmgccdir=<i>directory</i></tt>
162 <p>Optionally, specify for <i>directory</i> the full pathname of the
John Criswell838bce52005-05-09 16:39:27 +0000[diff] [blame]163 C/C++ front end installation to use with this LLVM configuration. If
Reid Spencerfef93b72004-12-26 05:47:26 +0000[diff] [blame]164 not specified, the PATH will be searched.</p></li>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]165 <li><tt>--enable-spec2000=<i>directory</i></tt>
166 <p>Enable the SPEC2000 benchmarks for testing. The SPEC2000
167 benchmarks should be available in
168 <tt><i>directory</i></tt>.</p></li>
169 </ul>
170 </ol></li>
171
172 <li>Build the LLVM Suite:
173 <ol>
Chris Lattner95e92582004-07-18 22:32:22 +0000[diff] [blame]174 <li><tt>gmake -k |&amp; tee gnumake.out
175 &nbsp;&nbsp;&nbsp;# this is csh or tcsh syntax</tt></li>
Chris Lattner78ce3b82007-01-04 07:06:05 +0000[diff] [blame]176 <li>If you get an "internal compiler error (ICE)" or test failures, see
177 <a href="#brokengcc">below</a>.</li>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]178 </ol>
179
180</ol>
181
Chris Lattnerfcd37252004-06-21 22:52:48 +0000[diff] [blame]182<p>Consult the <a href="#starting">Getting Started with LLVM</a> section for
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]183detailed information on configuring and compiling LLVM. See <a
184href="#environment">Setting Up Your Environment</a> for tips that simplify
185working with the GCC front end and LLVM tools. Go to <a href="#layout">Program
186Layout</a> to learn about the layout of the source code tree.</p>
187
188</div>
189
190<!-- *********************************************************************** -->
191<div class="doc_section">
192 <a name="requirements"><b>Requirements</b></a>
193</div>
194<!-- *********************************************************************** -->
195
196<div class="doc_text">
197
198<p>Before you begin to use the LLVM system, review the requirements given below.
199This may save you some trouble by knowing ahead of time what hardware and
200software you will need.</p>
201
202</div>
203
204<!-- ======================================================================= -->
205<div class="doc_subsection">
206 <a name="hardware"><b>Hardware</b></a>
207</div>
208
209<div class="doc_text">
210
211<p>LLVM is known to work on the following platforms:</p>
212
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]213<table cellpadding="3" summary="Known LLVM platforms">
Misha Brukman14ab5372004-11-15 05:19:53 +0000[diff] [blame]214<tr>
215 <th>OS</th>
216 <th>Arch</th>
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]217 <th>Compilers</th>
Misha Brukman14ab5372004-11-15 05:19:53 +0000[diff] [blame]218</tr>
219<tr>
220 <td>Linux</td>
Chris Lattner7db3f522005-02-09 21:15:51 +0000[diff] [blame]221 <td>x86<sup><a href="#pf_1">1</a></sup></td>
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]222 <td>GCC</td>
Misha Brukman14ab5372004-11-15 05:19:53 +0000[diff] [blame]223</tr>
224<tr>
225 <td>Solaris</td>
226 <td>V9 (Ultrasparc)</td>
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]227 <td>GCC</td>
Misha Brukman14ab5372004-11-15 05:19:53 +0000[diff] [blame]228</tr>
229<tr>
230 <td>FreeBSD</td>
Chris Lattner7db3f522005-02-09 21:15:51 +0000[diff] [blame]231 <td>x86<sup><a href="#pf_1">1</a></sup></td>
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]232 <td>GCC</td>
Misha Brukman14ab5372004-11-15 05:19:53 +0000[diff] [blame]233</tr>
234<tr>
Chris Lattner7db3f522005-02-09 21:15:51 +0000[diff] [blame]235 <td>MacOS X<sup><a href="#pf_2">2</a></sup></td>
Misha Brukman14ab5372004-11-15 05:19:53 +0000[diff] [blame]236 <td>PowerPC</td>
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]237 <td>GCC</td>
Misha Brukman14ab5372004-11-15 05:19:53 +0000[diff] [blame]238</tr>
239<tr>
Tanya Lattner993b9802006-04-20 04:35:34 +0000[diff] [blame]240 <td>MacOS X<sup><a href="#pf_2">2</a></sup></td>
241 <td>x86</td>
242 <td>GCC</td>
243
244</tr>
245<tr>
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]246 <td>Cygwin/Win32</td>
Chris Lattner6947e552006-07-21 00:06:27 +0000[diff] [blame]247 <td>x86<sup><a href="#pf_1">1</a>,<a href="#pf_8">8</a></sup></td>
Reid Spencer65e8f5b2004-12-23 19:39:54 +0000[diff] [blame]248 <td>GCC 3.4.X, binutils 2.15</td>
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]249</tr>
Misha Brukmanc155a0a2004-12-23 07:14:56 +0000[diff] [blame]250<tr>
Chris Lattner8ccb87f2005-02-09 20:43:48 +0000[diff] [blame]251 <td>MinGW/Win32</td>
Chris Lattner6947e552006-07-21 00:06:27 +0000[diff] [blame]252 <td>x86<sup><a href="#pf_1">1</a>,<a href="#pf_6">6</a>,<a href="#pf_8">8</a></sup></td>
Chris Lattner8ccb87f2005-02-09 20:43:48 +0000[diff] [blame]253 <td>GCC 3.4.X, binutils 2.15</td>
254</tr>
255<tr>
Misha Brukmanc155a0a2004-12-23 07:14:56 +0000[diff] [blame]256 <td>Linux</td>
Chris Lattner7db3f522005-02-09 21:15:51 +0000[diff] [blame]257 <td>amd64<sup><a href="#pf_3">3</a></sup></td>
Misha Brukmanc155a0a2004-12-23 07:14:56 +0000[diff] [blame]258 <td>GCC</td>
259</tr>
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]260</table>
261
262<p>LLVM has partial support for the following platforms:</p>
263
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]264<table summary="LLVM partial platform support">
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]265<tr>
266 <th>OS</th>
267 <th>Arch</th>
268 <th>Compilers</th>
Misha Brukman14ab5372004-11-15 05:19:53 +0000[diff] [blame]269</tr>
Misha Brukman00117692004-11-15 21:05:08 +0000[diff] [blame]270<tr>
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]271 <td>Windows</td>
Chris Lattner7db3f522005-02-09 21:15:51 +0000[diff] [blame]272 <td>x86<sup><a href="#pf_1">1</a></sup></td>
273 <td>Visual Studio .NET<sup><a href="#pf_4">4</a>,<a href="#pf_5">5</a></sup></td>
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]274<tr>
Chris Lattner7db3f522005-02-09 21:15:51 +0000[diff] [blame]275 <td>AIX<sup><a href="#pf_3">3</a>,<a href="#pf_4">4</a></sup></td>
Misha Brukman00117692004-11-15 21:05:08 +0000[diff] [blame]276 <td>PowerPC</td>
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]277 <td>GCC</td>
278</tr>
279<tr>
Chris Lattner7db3f522005-02-09 21:15:51 +0000[diff] [blame]280 <td>Linux<sup><a href="#pf_3">3</a>,<a href="#pf_5">5</a></sup></td>
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]281 <td>PowerPC</td>
282 <td>GCC</td>
Misha Brukman00117692004-11-15 21:05:08 +0000[diff] [blame]283</tr>
John Criswell75162552005-05-09 16:49:59 +0000[diff] [blame]284
285<tr>
286 <td>Linux<sup><a href="#pf_7">7</a></sup></td>
287 <td>Alpha</td>
288 <td>GCC</td>
289</tr>
290<tr>
291 <td>Linux<sup><a href="#pf_7">7</a></sup></td>
292 <td>Itanium (IA-64)</td>
293 <td>GCC</td>
294</tr>
Duraid Madinae8714af2005-05-10 06:57:53 +0000[diff] [blame]295<tr>
296 <td>HP-UX<sup><a href="#pf_7">7</a></sup></td>
297 <td>Itanium (IA-64)</td>
298 <td>HP aCC</td>
299</tr>
Misha Brukman14ab5372004-11-15 05:19:53 +0000[diff] [blame]300</table>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]301
Misha Brukmana892ead2005-02-09 21:01:26 +0000[diff] [blame]302<p><b>Notes:</b></p>
303
Misha Brukman6d8e1532005-02-09 22:38:47 +0000[diff] [blame]304<div class="doc_notes">
305<ol>
306<li><a name="pf_1">Code generation supported for Pentium processors and
307up</a></li>
308<li><a name="pf_2">Code generation supported for 32-bit ABI only</a></li>
309<li><a name="pf_3">No native code generation</a></li>
310<li><a name="pf_4">Build is not complete: one or more tools don't link</a></li>
311<li><a name="pf_5">The GCC-based C/C++ frontend does not build</a></li>
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]312<li><a name="pf_6">The port is done using the MSYS shell.</a>
Misha Brukmana892ead2005-02-09 21:01:26 +0000[diff] [blame]313<a href="http://www.mingw.org/MinGWiki/">Download</a> and install
Chris Lattner6947e552006-07-21 00:06:27 +0000[diff] [blame]314bison (excl. M4.exe) and flex in that order. Build binutils-2.15 from source,
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]315if necessary. Bison &amp; flex can be also grabbed from GNUWin32 sf.net
316project.</li>
John Criswell75162552005-05-09 16:49:59 +0000[diff] [blame]317<li><a name="pf_7">Native code generation exists but is not complete.</a></li>
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]318<li><a name="pf_8">Binutils</a> up to post-2.17 has bug in bfd/cofflink.c
Chris Lattner6947e552006-07-21 00:06:27 +0000[diff] [blame]319 preventing LLVM from building correctly. Several workarounds have been
320 introduced into LLVM build system, but the bug can occur anytime in the
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]321 future. We highly recommend that you rebuild your current binutils with the
Chris Lattner6947e552006-07-21 00:06:27 +0000[diff] [blame]322 patch from <a href="http://sourceware.org/bugzilla/show_bug.cgi?id=2659">
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]323 Binutils bugzilla</a>, if it wasn't already applied.</li>
Misha Brukmana892ead2005-02-09 21:01:26 +0000[diff] [blame]324</ol>
Misha Brukmana892ead2005-02-09 21:01:26 +0000[diff] [blame]325</div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]326
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]327<p>Note that you will need about 1-3 GB of space for a full LLVM build in Debug
John Criswell8bfe6a72005-05-18 19:43:33 +0000[diff] [blame]328mode, depending on the system (it is so large because of all the debugging
329information and the fact that the libraries are statically linked into multiple
330tools). If you do not need many of the tools and you are space-conscious,
Misha Brukman69def742004-11-19 21:53:22 +0000[diff] [blame]331you can disable them individually in <tt>llvm/tools/Makefile</tt>. The Release
332build requires considerably less space.</p>
333
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]334<p>The LLVM suite <i>may</i> compile on other platforms, but it is not
335guaranteed to do so. If compilation is successful, the LLVM utilities should be
336able to assemble, disassemble, analyze, and optimize LLVM bytecode. Code
337generation should work as well, although the generated native code may not work
338on your platform.</p>
339
340<p>The GCC front end is not very portable at the moment. If you want to get it
Misha Brukman22e9e332004-08-09 19:57:01 +0000[diff] [blame]341to work on another platform, you can download a copy of the source and <a
342href="CFEBuildInstrs.html">try to compile it</a> on your platform.</p>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]343
344</div>
345
346<!-- ======================================================================= -->
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]347<div class="doc_subsection"><a name="software"><b>Software</b></a></div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]348<div class="doc_text">
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]349 <p>Compiling LLVM requires that you have several software packages
350 installed. The table below lists those required packages. The Package column
351 is the usual name for the software package that LLVM depends on. The Version
352 column provides "known to work" versions of the package. The Notes column
353 describes how LLVM uses the package and provides other details.</p>
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]354 <table summary="Packages required to compile LLVM">
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]355 <tr><th>Package</th><th>Version</th><th>Notes</th></tr>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]356
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]357 <tr>
358 <td><a href="http://savannah.gnu.org/projects/make">GNU Make</a></td>
359 <td>3.79, 3.79.1</td>
360 <td>Makefile/build processor</td>
361 </tr>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]362
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]363 <tr>
364 <td><a href="http://gcc.gnu.org">GCC</a></td>
365 <td>3.4.2</td>
Misha Brukman6d8e1532005-02-09 22:38:47 +0000[diff] [blame]366 <td>C/C++ compiler<sup><a href="#sf1">1</a></sup></td>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]367 </tr>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]368
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]369 <tr>
Chris Lattner2286cab2005-09-06 04:07:15 +0000[diff] [blame]370 <td><a href="http://www.gnu.org/software/texinfo">TeXinfo</a></td>
371 <td>4.5</td>
372 <td>For building the CFE</td>
373 </tr>
374
375 <tr>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]376 <td><a href="http://www.gnu.org/software/flex">Flex</a></td>
377 <td>2.5.4</td>
378 <td>LEX compiler</td>
379 </tr>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]380
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]381 <tr>
382 <td><a href="http://www.gnu.org/software/bison/bison.html">Bison</a></td>
Jeff Cohen4896c5d2006-01-04 06:51:22 +0000[diff] [blame]383 <td>1.28, 1.35, 1.75, 1.875d, 2.0, or 2.1<br>(not 1.85 or 1.875)</td>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]384 <td>YACC compiler</td>
385 </tr>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]386
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]387 <tr>
Misha Brukman6d8e1532005-02-09 22:38:47 +0000[diff] [blame]388 <td><a href="https://www.cvshome.org/downloads.html">CVS</a></td>
389 <td>&ge;1.11</td>
390 <td>CVS access to LLVM<sup><a href="#sf2">2</a></sup></td>
391 </tr>
392
393 <tr>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]394 <td><a href="http://savannah.gnu.org/projects/dejagnu">DejaGnu</a></td>
395 <td>1.4.2</td>
Misha Brukman6d8e1532005-02-09 22:38:47 +0000[diff] [blame]396 <td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]397 </tr>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]398
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]399 <tr>
400 <td><a href="http://www.tcl.tk/software/tcltk/">tcl</a></td>
401 <td>8.3, 8.4</td>
Misha Brukman6d8e1532005-02-09 22:38:47 +0000[diff] [blame]402 <td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]403 </tr>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]404
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]405 <tr>
406 <td><a href="http://expect.nist.gov/">expect</a></td>
407 <td>5.38.0</td>
Misha Brukman6d8e1532005-02-09 22:38:47 +0000[diff] [blame]408 <td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]409 </tr>
410
411 <tr>
412 <td><a href="http://www.perl.com/download.csp">perl</a></td>
Reid Spencer200d93b2004-12-09 17:55:37 +0000[diff] [blame]413 <td>&ge;5.6.0</td>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]414 <td>Nightly tester, utilities</td>
415 </tr>
416
417 <tr>
Misha Brukman6d8e1532005-02-09 22:38:47 +0000[diff] [blame]418 <td><a href="http://savannah.gnu.org/projects/m4">GNU M4</a>
419 <td>1.4</td>
420 <td>Macro processor for configuration<sup><a href="#sf4">4</a></sup></td>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]421 </tr>
422
423 <tr>
Misha Brukman6d8e1532005-02-09 22:38:47 +0000[diff] [blame]424 <td><a href="http://www.gnu.org/software/autoconf">GNU Autoconf</a></td>
425 <td>2.59</td>
426 <td>Configuration script builder<sup><a href="#sf4">4</a></sup></td>
427 </tr>
428
429 <tr>
430 <td><a href="http://www.gnu.org/software/automake">GNU Automake</a></td>
431 <td>1.9.2</td>
432 <td>aclocal macro generator<sup><a href="#sf4">4</a></sup></td>
433 </tr>
434
435 <tr>
436 <td><a href="http://savannah.gnu.org/projects/libtool">libtool</a></td>
437 <td>1.5.10</td>
438 <td>Shared library manager<sup><a href="#sf4">4</a></sup></td>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]439 </tr>
440
441 </table>
442
Misha Brukman6d8e1532005-02-09 22:38:47 +0000[diff] [blame]443 <p><b>Notes:</b></p>
444 <div class="doc_notes">
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]445 <ol>
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]446 <li><a name="sf1">Only the C and C++ languages are needed so there's no
Misha Brukman6d8e1532005-02-09 22:38:47 +0000[diff] [blame]447 need to build the other languages for LLVM's purposes.</a> See
448 <a href="#brokengcc">below</a> for specific version info.</li>
449 <li><a name="sf2">You only need CVS if you intend to build from the
450 latest LLVM sources. If you're working from a release distribution, you
451 don't need CVS.</a></li>
452 <li><a name="sf3">Only needed if you want to run the automated test
453 suite in the <tt>llvm/test</tt> directory.</a></li>
454 <li><a name="sf4">If you want to make changes to the configure scripts,
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]455 you will need GNU autoconf (2.59), and consequently, GNU M4 (version 1.4
Reid Spencer200d93b2004-12-09 17:55:37 +0000[diff] [blame]456 or higher). You will also need automake (1.9.2). We only use aclocal
457 from that package.</a></li>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]458 </ol>
Misha Brukman6d8e1532005-02-09 22:38:47 +0000[diff] [blame]459 </div>
460
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]461 <p>Additionally, your compilation host is expected to have the usual
462 plethora of Unix utilities. Specifically:</p>
463 <ul>
464 <li><b>ar</b> - archive library builder</li>
465 <li><b>bzip2*</b> - bzip2 command for distribution generation</li>
466 <li><b>bunzip2*</b> - bunzip2 command for distribution checking</li>
467 <li><b>chmod</b> - change permissions on a file</li>
John Criswellc4ef3f22004-12-08 16:55:27 +0000[diff] [blame]468 <li><b>cat</b> - output concatenation utility</li>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]469 <li><b>cp</b> - copy files</li>
470 <li><b>date</b> - print the current date/time </li>
471 <li><b>echo</b> - print to standard output</li>
472 <li><b>egrep</b> - extended regular expression search utility</li>
473 <li><b>etags</b> - C/C++ tag file creator for vim/emacs</li>
474 <li><b>find</b> - find files/dirs in a file system</li>
475 <li><b>grep</b> - regular expression search utility</li>
476 <li><b>gzip*</b> - gzip command for distribution generation</li>
477 <li><b>gunzip*</b> - gunzip command for distribution checking</li>
478 <li><b>install</b> - install directories/files </li>
479 <li><b>mkdir</b> - create a directory</li>
480 <li><b>mv</b> - move (rename) files</li>
481 <li><b>ranlib</b> - symbol table builder for archive libraries</li>
Misha Brukman616bd052004-11-20 01:27:40 +0000[diff] [blame]482 <li><b>rm</b> - remove (delete) files and directories</li>
Reid Spencer748d82e2004-11-15 21:15:12 +0000[diff] [blame]483 <li><b>sed</b> - stream editor for transforming output</li>
484 <li><b>sh</b> - Bourne shell for make build scripts</li>
485 <li><b>tar</b> - tape archive for distribution generation</li>
486 <li><b>test</b> - test things in file system</li>
487 <li><b>unzip*</b> - unzip command for distribution checking</li>
488 <li><b>zip*</b> - zip command for distribution generation</li>
489 </ul>
Chris Lattner95e92582004-07-18 22:32:22 +0000[diff] [blame]490</div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]491
Chris Lattner95e92582004-07-18 22:32:22 +0000[diff] [blame]492<!-- ======================================================================= -->
493<div class="doc_subsection">
494 <a name="brokengcc">Broken versions of GCC</a>
495</div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]496
Chris Lattner95e92582004-07-18 22:32:22 +0000[diff] [blame]497<div class="doc_text">
498
499<p>LLVM is very demanding of the host C++ compiler, and as such tends to expose
500bugs in the compiler. In particular, several versions of GCC crash when trying
Chris Lattner6557f182006-06-16 17:20:33 +0000[diff] [blame]501to compile LLVM. We routinely use GCC 3.3.3, 3.4.0, and Apple 4.0.1
502successfully with them (however, see below). Other versions of GCC will
503probably work as well. GCC versions listed
Chris Lattner95e92582004-07-18 22:32:22 +0000[diff] [blame]504here are known to not work. If you are using one of these versions, please try
505to upgrade your GCC to something more recent. If you run into a problem with a
506version of GCC not listed here, please <a href="mailto:llvmdev@cs.uiuc.edu">let
507us know</a>. Please use the "<tt>gcc -v</tt>" command to find out which version
508of GCC you are using.
509</p>
510
511<p><b>GCC versions prior to 3.0</b>: GCC 2.96.x and before had several
512problems in the STL that effectively prevent it from compiling LLVM.
513</p>
514
John Criswell294ba022004-11-23 22:06:24 +0000[diff] [blame]515<p><b>GCC 3.2.2</b>: This version of GCC fails to compile LLVM.</p>
516
Chris Lattner95e92582004-07-18 22:32:22 +0000[diff] [blame]517<p><b>GCC 3.3.2</b>: This version of GCC suffered from a <a
518href="http://gcc.gnu.org/PR13392">serious bug</a> which causes it to crash in
519the "<tt>convert_from_eh_region_ranges_1</tt>" GCC function.</p>
Chris Lattner25e7b162005-02-12 20:11:13 +0000[diff] [blame]520
Chris Lattner8e64f152005-02-13 22:20:49 +0000[diff] [blame]521<p><b>Cygwin GCC 3.3.3</b>: The version of GCC 3.3.3 commonly shipped with
522 Cygwin does not work. Please <a href="CFEBuildInstrs.html#cygwin">upgrade
523 to a newer version</a> if possible.</p>
524<p><b>SuSE GCC 3.3.3</b>: The version of GCC 3.3.3 shipped with SuSE 9.1 (and
525 possibly others) does not compile LLVM correctly (it appears that exception
526 handling is broken in some cases). Please download the FSF 3.3.3 or upgrade
527 to a newer version of GCC.</p>
Chris Lattnerf2b5e6e2005-05-15 22:26:45 +0000[diff] [blame]528<p><b>IA-64 GCC 4.0.0</b>: The IA-64 version of GCC 4.0.0 is known to
529 miscompile LLVM.</p>
Chris Lattnerdd197912006-06-16 19:53:39 +0000[diff] [blame]530<p><b>Apple Xcode 2.3</b>: GCC crashes when compiling LLVM at -O3 (which is the
531 default with ENABLE_OPTIMIZED=1. To work around this, build with
532 "ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O2".</p>
Chris Lattnerc40eb5e2006-09-07 17:34:27 +0000[diff] [blame]533<p><b>GCC 4.1.1</b>: GCC fails to build LLVM with template concept check errors
534 compiling some files. At the time of this writing, GCC mainline (4.2)
535 did not share the problem.</p>
Chris Lattner78ce3b82007-01-04 07:06:05 +0000[diff] [blame]536<p><b>GCC 4.1.1 on X86-64/amd64</b>: GCC <a href="http://llvm.org/PR1063">
537 miscompiles portions of LLVM</a> when compiling llvm itself into 64-bit
538 code. LLVM will appear to mostly work but will be buggy, e.g. failing
539 portions of its testsuite.</p>
Reid Spencer7a119082006-11-04 00:33:42 +0000[diff] [blame]540<p><b>GNU ld 2.16.X</b>. Some 2.16.X versions of the ld linker will produce very
541long warning messages complaining that some ".gnu.linkonce.t.*" symbol was
542defined in a discarded section. You can safely ignore these messages as they are
543erroneous and the linkage is correct. These messages disappear using ld
5442.17.</p>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]545</div>
546
Chris Lattner95e92582004-07-18 22:32:22 +0000[diff] [blame]547
548
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]549<!-- *********************************************************************** -->
550<div class="doc_section">
551 <a name="starting"><b>Getting Started with LLVM</b></a>
552</div>
553<!-- *********************************************************************** -->
554
Chris Lattner95e92582004-07-18 22:32:22 +0000[diff] [blame]555<div class="doc_text">
556
557<p>The remainder of this guide is meant to get you up and running with
558LLVM and to give you some basic information about the LLVM environment.</p>
559
560<p>The later sections of this guide describe the <a
561href="#layout">general layout</a> of the the LLVM source tree, a <a
562href="#tutorial">simple example</a> using the LLVM tool chain, and <a
563href="#links">links</a> to find more information about LLVM or to get
564help via e-mail.</p>
565</div>
566
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]567<!-- ======================================================================= -->
568<div class="doc_subsection">
569 <a name="terminology">Terminology and Notation</a>
570</div>
571
572<div class="doc_text">
573
574<p>Throughout this manual, the following names are used to denote paths
575specific to the local system and working environment. <i>These are not
576environment variables you need to set but just strings used in the rest
577of this document below</i>. In any of the examples below, simply replace
578each of these names with the appropriate pathname on your local system.
579All these paths are absolute:</p>
580
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]581<dl>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]582 <dt>SRC_ROOT
583 <dd>
584 This is the top level directory of the LLVM source tree.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]585 <br><br>
John Criswell0f6d7c02003-10-27 18:18:16 +0000[diff] [blame]586
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]587 <dt>OBJ_ROOT
588 <dd>
589 This is the top level directory of the LLVM object tree (i.e. the
590 tree where object files and compiled programs will be placed. It
591 can be the same as SRC_ROOT).
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]592 <br><br>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]593
594 <dt>LLVMGCCDIR
595 <dd>
Reid Spencerfef93b72004-12-26 05:47:26 +0000[diff] [blame]596 This is where the LLVM GCC Front End is installed.
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]597 <p>
598 For the pre-built GCC front end binaries, the LLVMGCCDIR is
Tanya Lattnerf7b6be02006-11-20 06:04:46 +0000[diff] [blame]599 <tt>llvm-gcc/<i>platform</i>/llvm-gcc</tt>.
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]600</dl>
601
602</div>
603
604<!-- ======================================================================= -->
605<div class="doc_subsection">
606 <a name="environment">Setting Up Your Environment</a>
607</div>
608
609<div class="doc_text">
610
611<p>
Misha Brukman8f0cad12005-02-03 18:28:08 +0000[diff] [blame]612In order to compile and use LLVM, you may need to set some environment
613variables.
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]614
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]615<dl>
Reid Spencerf96eb572004-12-15 00:14:01 +0000[diff] [blame]616 <dt><tt>LLVM_LIB_SEARCH_PATH</tt>=<tt>/path/to/your/bytecode/libs</tt></dt>
Misha Brukman8f0cad12005-02-03 18:28:08 +0000[diff] [blame]617 <dd>[Optional] This environment variable helps LLVM linking tools find the
John Criswell8bfe6a72005-05-18 19:43:33 +0000[diff] [blame]618 locations of your bytecode libraries. It is provided only as a
Misha Brukman8f0cad12005-02-03 18:28:08 +0000[diff] [blame]619 convenience since you can specify the paths using the -L options of the
John Criswell8bfe6a72005-05-18 19:43:33 +0000[diff] [blame]620 tools and the C/C++ front-end will automatically use the bytecode files
621 installed in its
Misha Brukman8f0cad12005-02-03 18:28:08 +0000[diff] [blame]622 <tt>lib</tt> directory.</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]623</dl>
624
625</div>
626
627<!-- ======================================================================= -->
628<div class="doc_subsection">
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]629 <a name="unpack">Unpacking the LLVM Archives</a>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]630</div>
631
632<div class="doc_text">
633
634<p>
635If you have the LLVM distribution, you will need to unpack it before you
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]636can begin to compile it. LLVM is distributed as a set of two files: the LLVM
John Criswell9e2485c2004-12-10 15:51:16 +0000[diff] [blame]637suite and the LLVM GCC front end compiled for your platform. There is an
638additional test suite that is optional. Each file is a TAR archive that is
639compressed with the gzip program.
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]640</p>
641
Misha Brukman3ce11032005-02-02 18:01:57 +0000[diff] [blame]642<p>The files are as follows, with <em>x.y</em> marking the version number:
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]643<dl>
Misha Brukman3ce11032005-02-02 18:01:57 +0000[diff] [blame]644 <dt><tt>llvm-x.y.tar.gz</tt></dt>
645 <dd>Source release for the LLVM libraries and tools.<br/></dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]646
Misha Brukman3ce11032005-02-02 18:01:57 +0000[diff] [blame]647 <dt><tt>llvm-test-x.y.tar.gz</tt></dt>
Chris Lattner7db3f522005-02-09 21:15:51 +0000[diff] [blame]648 <dd>Source release for the LLVM test suite.</dd>
Misha Brukman8f9e6d62004-11-23 19:26:24 +0000[diff] [blame]649
Chris Lattner1ef81af2006-04-20 05:08:23 +0000[diff] [blame]650 <dt><tt>llvm-gcc4-x.y.source.tar.gz</tt></dt>
651 <dd>Source release of the llvm-gcc4 front end. See README.LLVM in the root
652 directory for build instructions.<br/></dd>
653
Tanya Lattnerf7b6be02006-11-20 06:04:46 +0000[diff] [blame]654 <dt><tt>llvm-gcc4-x.y-platform.tar.gz</tt></dt>
655 <dd>Binary release of the llvm-gcc4 front end for a specific platform.<br/></dd>
Chris Lattner1ef81af2006-04-20 05:08:23 +0000[diff] [blame]656
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]657</dl>
658
Jim Laskey6c3acb72006-07-31 21:37:55 +0000[diff] [blame]659<p>It is also possible to download the sources of the llvm-gcc4 front end from a
660read-only subversion mirror at
661svn://anonsvn.opensource.apple.com/svn/llvm/trunk. </p>
Jim Laskey3261f0b2006-06-16 23:20:21 +0000[diff] [blame]662
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]663</div>
664
665<!-- ======================================================================= -->
666<div class="doc_subsection">
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]667 <a name="checkout">Checkout LLVM from CVS</a>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]668</div>
669
670<div class="doc_text">
671
672<p>If you have access to our CVS repository, you can get a fresh copy of
673the entire source code. All you need to do is check it out from CVS as
674follows:</p>
675
676<ul>
677<li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
Chris Lattnerc75a04b2006-08-03 22:14:43 +0000[diff] [blame]678 <li><tt>cvs -d :pserver:anon@llvm.org:/var/cvs/llvm login</tt>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]679 <li>Hit the return key when prompted for the password.
Chris Lattnerc75a04b2006-08-03 22:14:43 +0000[diff] [blame]680 <li><tt>cvs -z3 -d :pserver:anon@llvm.org:/var/cvs/llvm co
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]681 llvm</tt>
682</ul>
683
684<p>This will create an '<tt>llvm</tt>' directory in the current
685directory and fully populate it with the LLVM source code, Makefiles,
686test directories, and local copies of documentation files.</p>
687
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]688<p>If you want to get a specific release (as opposed to the most recent
689revision), you can specify a label. The following releases have the following
Misha Brukman3ce11032005-02-02 18:01:57 +0000[diff] [blame]690labels:</p>
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]691
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]692<ul>
Tanya Lattner134693a2006-11-20 06:07:10 +0000[diff] [blame]693<li>Release 1.9: <b>RELEASE_19</b></li>
Tanya Lattnerf7b6be02006-11-20 06:04:46 +0000[diff] [blame]694<li>Release 1.8: <b>RELEASE_18</b></li>
Tanya Lattner993b9802006-04-20 04:35:34 +0000[diff] [blame]695<li>Release 1.7: <b>RELEASE_17</b></li>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]696<li>Release 1.6: <b>RELEASE_16</b></li>
John Criswell75162552005-05-09 16:49:59 +0000[diff] [blame]697<li>Release 1.5: <b>RELEASE_15</b></li>
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]698<li>Release 1.4: <b>RELEASE_14</b></li>
John Criswell18b74642004-08-16 14:51:33 +0000[diff] [blame]699<li>Release 1.3: <b>RELEASE_13</b></li>
Misha Brukmanb9be2bf2004-05-12 19:25:59 +0000[diff] [blame]700<li>Release 1.2: <b>RELEASE_12</b></li>
701<li>Release 1.1: <b>RELEASE_11</b></li>
702<li>Release 1.0: <b>RELEASE_1</b></li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]703</ul>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]704
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]705<p>If you would like to get the LLVM test suite (a separate package as of 1.4),
706you get it from the CVS repository:</p>
707<pre>
708 cd llvm/projects
Chris Lattnerc75a04b2006-08-03 22:14:43 +0000[diff] [blame]709 cvs -z3 -d :pserver:anon@llvm.org:/var/cvs/llvm co llvm-test
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]710</pre>
711<p>By placing it in the <tt>llvm/projects</tt>, it will be automatically
John Criswellc4ef3f22004-12-08 16:55:27 +0000[diff] [blame]712configured by the LLVM configure script as well as automatically updated when
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]713you run <tt>cvs update</tt>.</p>
714
Tanya Lattner993b9802006-04-20 04:35:34 +0000[diff] [blame]715<p>If you would like to get the GCC 3.4 front end source code, you can also get it from the CVS repository:</p>
Misha Brukmanb9be2bf2004-05-12 19:25:59 +0000[diff] [blame]716
Chris Lattner604fdc12004-06-28 17:14:01 +0000[diff] [blame]717<pre>
Chris Lattnerc75a04b2006-08-03 22:14:43 +0000[diff] [blame]718 cvs -z3 -d :pserver:anon@llvm.org:/var/cvs/llvm co llvm-gcc
Misha Brukmanb9be2bf2004-05-12 19:25:59 +0000[diff] [blame]719</pre>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]720
Chris Lattner604fdc12004-06-28 17:14:01 +0000[diff] [blame]721<p>Please note that you must follow <a href="CFEBuildInstrs.html">these
John Criswell3d8ba512004-12-08 17:53:54 +0000[diff] [blame]722instructions</a> to successfully build the LLVM GCC front-end.</p>
Chris Lattner604fdc12004-06-28 17:14:01 +0000[diff] [blame]723
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]724</div>
725
726<!-- ======================================================================= -->
727<div class="doc_subsection">
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]728 <a name="installcf">Install the GCC Front End</a>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]729</div>
730
731<div class="doc_text">
732
733<p>Before configuring and compiling the LLVM suite, you need to extract the LLVM
734GCC front end from the binary distribution. It is used for building the
735bytecode libraries later used by the GCC front end for linking programs, and its
736location must be specified when the LLVM suite is configured.</p>
737
738<p>To install the GCC front end, do the following:</p>
739
740<ol>
741 <li><tt>cd <i>where-you-want-the-front-end-to-live</i></tt></li>
Tanya Lattnerf7b6be02006-11-20 06:04:46 +0000[diff] [blame]742 <li><tt>gunzip --stdout llvmgcc-<i>version</i>.<i>platform</i>.tar.gz | tar -xvf
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]743 -</tt></li>
744</ol>
745
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]746<p>The binary versions of the GCC front end may not suit all of your needs. For
747example, the binary distribution may include an old version of a system header
748file, not "fix" a header file that needs to be fixed for GCC, or it may be
749linked with libraries not available on your system.</p>
750
751<p>In cases like these, you may want to try <a
752href="CFEBuildInstrs.html">building the GCC front end from source.</a> This is
753not for the faint of heart, so be forewarned.</p>
754
755</div>
756
757<!-- ======================================================================= -->
758<div class="doc_subsection">
759 <a name="config">Local LLVM Configuration</a>
760</div>
761
762<div class="doc_text">
763
764<p>Once checked out from the CVS repository, the LLVM suite source code must be
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]765configured via the <tt>configure</tt> script. This script sets variables in the
766various <tt>*.in</tt> files, most notably <tt>llvm/Makefile.config</tt> and
767<tt>llvm/include/Config/config.h</tt>. It also populates <i>OBJ_ROOT</i> with
768the Makefiles needed to begin building LLVM.</p>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]769
770<p>The following environment variables are used by the <tt>configure</tt>
771script to configure the build system:</p>
772
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]773<table summary="LLVM configure script environment variables">
Reid Spencerd3f876c2004-11-01 08:19:36 +0000[diff] [blame]774 <tr><th>Variable</th><th>Purpose</th></tr>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]775 <tr>
776 <td>CC</td>
777 <td>Tells <tt>configure</tt> which C compiler to use. By default,
778 <tt>configure</tt> will look for the first GCC C compiler in
779 <tt>PATH</tt>. Use this variable to override
780 <tt>configure</tt>'s default behavior.</td>
781 </tr>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]782 <tr>
783 <td>CXX</td>
784 <td>Tells <tt>configure</tt> which C++ compiler to use. By default,
785 <tt>configure</tt> will look for the first GCC C++ compiler in
786 <tt>PATH</tt>. Use this variable to override
787 <tt>configure</tt>'s default behavior.</td>
788 </tr>
789</table>
790
791<p>The following options can be used to set or enable LLVM specific options:</p>
792
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]793<dl>
Reid Spencerfef93b72004-12-26 05:47:26 +0000[diff] [blame]794 <dt><i>--with-llvmgccdir</i></dt>
795 <dd>Path to the LLVM C/C++ FrontEnd to be used with this LLVM configuration.
796 The value of this option should specify the full pathname of the C/C++ Front
797 End to be used. If this option is not provided, the PATH will be searched for
798 a program named <i>llvm-gcc</i> and the C/C++ FrontEnd install directory will
799 be inferred from the path found. If the option is not given, and no llvm-gcc
800 can be found in the path then a warning will be produced by
801 <tt>configure</tt> indicating this situation. LLVM may still be built with
802 the <tt>tools-only</tt> target but attempting to build the runtime libraries
803 will fail as these libraries require llvm-gcc and llvm-g++. See
804 <a href="#installcf">Install the GCC Front End</a> for details on installing
805 the C/C++ Front End. See
806 <a href="CFEBuildInstrs.html">Bootstrapping the LLVM C/C++ Front-End</a>
807 for details on building the C/C++ Front End.</dd>
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]808 <dt><i>--with-tclinclude</i></dt>
John Criswell8bfe6a72005-05-18 19:43:33 +0000[diff] [blame]809 <dd>Path to the tcl include directory under which <tt>tclsh</tt> can be
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]810 found. Use this if you have multiple tcl installations on your machine and you
811 want to use a specific one (8.x) for LLVM. LLVM only uses tcl for running the
812 dejagnu based test suite in <tt>llvm/test</tt>. If you don't specify this
John Criswell8bfe6a72005-05-18 19:43:33 +0000[diff] [blame]813 option, the LLVM configure script will search for the tcl 8.4 and 8.3
814 releases.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]815 <br><br>
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]816 </dd>
817 <dt><i>--enable-optimized</i></dt>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]818 <dd>
819 Enables optimized compilation by default (debugging symbols are removed
820 and GCC optimization flags are enabled). The default is to use an
821 unoptimized build (also known as a debug build).
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]822 <br><br>
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]823 </dd>
Reid Spencer9d57b4d2005-12-21 03:46:45 +0000[diff] [blame]824 <dt><i>--enable-debug-runtime</i></dt>
825 <dd>
826 Enables debug symbols in the runtime libraries. The default is to strip
827 debug symbols from the runtime libraries.
828 </dd>
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]829 <dt><i>--enable-jit</i></dt>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]830 <dd>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]831 Compile the Just In Time (JIT) compiler functionality. This is not
832 available
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]833 on all platforms. The default is dependent on platform, so it is best
834 to explicitly enable it if you want it.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]835 <br><br>
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]836 </dd>
Reid Spencer2dedcf52005-04-22 17:58:03 +0000[diff] [blame]837 <dt><i>--enable-targets=</i><tt>target-option</tt></dt>
838 <dd>Controls which targets will be built and linked into llc. The default
839 value for <tt>target_options</tt> is "all" which builds and links all
840 available targets. The value "host-only" can be specified to build only a
841 native compiler (no cross-compiler targets available). The "native" target is
842 selected as the target of the build host. You can also specify a comma
843 separated list of target names that you want available in llc. The target
John Criswell8bfe6a72005-05-18 19:43:33 +0000[diff] [blame]844 names use all lower case. The current set of targets is: <br/>
Reid Spencer2dedcf52005-04-22 17:58:03 +0000[diff] [blame]845 <tt>alpha, ia64, powerpc, skeleton, sparc, x86</tt>.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]846 <br><br></dd>
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]847 <dt><i>--enable-doxygen</i></dt>
848 <dd>Look for the doxygen program and enable construction of doxygen based
849 documentation from the source code. This is disabled by default because
850 generating the documentation can take a long time and producess 100s of
851 megabytes of output.</dd>
Anton Korobeynikov8cea37b2007-01-23 12:35:46 +0000[diff] [blame]852 <dt><i>--with-udis86</i></dt>
853 <dd>LLVM can use external disassembler library for various purposes (now it's
854 used only for examining code produced by JIT). This option will enable usage
855 of <a href="http://udis86.sourceforge.net/">udis86</a> x86 (both 32 and 64
856 bits) disassembler library.</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]857</dl>
858
859<p>To configure LLVM, follow these steps:</p>
860
861<ol>
862 <li>Change directory into the object root directory:
John Criswell0f6d7c02003-10-27 18:18:16 +0000[diff] [blame]863 <br>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]864 <tt>cd <i>OBJ_ROOT</i></tt>
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]865 <br><br>
John Criswell0f6d7c02003-10-27 18:18:16 +0000[diff] [blame]866
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]867 <li>Run the <tt>configure</tt> script located in the LLVM source tree:
868 <br>
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]869 <tt><i>SRC_ROOT</i>/configure --prefix=/install/path [other options]</tt>
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]870 <br><br>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]871</ol>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]872
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]873</div>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]874
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]875<!-- ======================================================================= -->
876<div class="doc_subsection">
877 <a name="compile">Compiling the LLVM Suite Source Code</a>
878</div>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]879
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]880<div class="doc_text">
John Criswell0b459202003-07-08 20:35:59 +0000[diff] [blame]881
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]882<p>Once you have configured LLVM, you can build it. There are three types of
883builds:</p>
John Criswell0b459202003-07-08 20:35:59 +0000[diff] [blame]884
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]885<dl>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]886 <dt>Debug Builds
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]887 <dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]888 These builds are the default when one types <tt>gmake</tt> (unless the
889 <tt>--enable-optimized</tt> option was used during configuration). The
890 build system will compile the tools and libraries with debugging
891 information.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]892 <br><br>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]893
894 <dt>Release (Optimized) Builds
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]895 <dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]896 These builds are enabled with the <tt>--enable-optimized</tt> option to
897 <tt>configure</tt> or by specifying <tt>ENABLE_OPTIMIZED=1</tt> on the
898 <tt>gmake</tt> command line. For these builds, the build system will
899 compile the tools and libraries with GCC optimizations enabled and strip
900 debugging information from the libraries and executables it generates.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]901 <br><br>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]902
903 <dt>Profile Builds
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]904 <dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]905 These builds are for use with profiling. They compile profiling
906 information into the code for use with programs like <tt>gprof</tt>.
907 Profile builds must be started by specifying <tt>ENABLE_PROFILING=1</tt>
908 on the <tt>gmake</tt> command line.
909</dl>
John Criswell7a73b802003-06-30 21:59:07 +0000[diff] [blame]910
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]911<p>Once you have LLVM configured, you can build it by entering the
912<i>OBJ_ROOT</i> directory and issuing the following command:</p>
John Criswell20d2d3e2003-10-10 14:26:14 +0000[diff] [blame]913
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]914<p><tt>gmake</tt></p>
John Criswell20d2d3e2003-10-10 14:26:14 +0000[diff] [blame]915
Chris Lattner95e92582004-07-18 22:32:22 +0000[diff] [blame]916<p>If the build fails, please <a href="#brokengcc">check here</a> to see if you
John Criswell3d8ba512004-12-08 17:53:54 +0000[diff] [blame]917are using a version of GCC that is known not to compile LLVM.</p>
Chris Lattner95e92582004-07-18 22:32:22 +0000[diff] [blame]918
919<p>
920If you have multiple processors in your machine, you may wish to use some of
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]921the parallel build options provided by GNU Make. For example, you could use the
922command:</p>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]923
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]924<p><tt>gmake -j2</tt></p>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]925
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]926<p>There are several special targets which are useful when working with the LLVM
927source code:</p>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]928
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]929<dl>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]930 <dt><tt>gmake clean</tt>
931 <dd>
932 Removes all files generated by the build. This includes object files,
933 generated C/C++ files, libraries, and executables.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]934 <br><br>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]935
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]936 <dt><tt>gmake dist-clean</tt>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]937 <dd>
Misha Brukmanad38e962004-08-21 23:40:49 +0000[diff] [blame]938 Removes everything that <tt>gmake clean</tt> does, but also removes files
939 generated by <tt>configure</tt>. It attempts to return the source tree to the
940 original state in which it was shipped.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]941 <br><br>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]942
Misha Brukmane51c3562004-08-23 20:25:33 +0000[diff] [blame]943 <dt><tt>gmake install</tt>
944 <dd>
John Criswell3d8ba512004-12-08 17:53:54 +0000[diff] [blame]945 Installs LLVM header files, libraries, tools, and documentation in a
946 hierarchy
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]947 under $PREFIX, specified with <tt>./configure --prefix=[dir]</tt>, which
948 defaults to <tt>/usr/local</tt>.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]949 <br><br>
950
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]951 <dt><tt>gmake -C runtime install-bytecode</tt>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]952 <dd>
Reid Spencer7863c402004-11-11 07:30:27 +0000[diff] [blame]953 Assuming you built LLVM into $OBJDIR, when this command is run, it will
954 install bytecode libraries into the GCC front end's bytecode library
955 directory. If you need to update your bytecode libraries,
Misha Brukmanad38e962004-08-21 23:40:49 +0000[diff] [blame]956 this is the target to use once you've built them.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]957 <br><br>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]958</dl>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]959
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]960<p>Please see the <a href="MakefileGuide.html">Makefile Guide</a> for further
961details on these <tt>make</tt> targets and descriptions of other targets
962available.</p>
963
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]964<p>It is also possible to override default values from <tt>configure</tt> by
965declaring variables on the command line. The following are some examples:</p>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]966
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]967<dl>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]968 <dt><tt>gmake ENABLE_OPTIMIZED=1</tt>
969 <dd>
970 Perform a Release (Optimized) build.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]971 <br><br>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]972
Reid Spencer004ba032006-04-09 23:45:38 +0000[diff] [blame]973 <dt><tt>gmake ENABLE_OPTIMIZED=1 DISABLE_ASSERTIONS=1</tt>
Chris Lattnerd4651262006-03-21 01:10:57 +0000[diff] [blame]974 <dd>
Reid Spencer004ba032006-04-09 23:45:38 +0000[diff] [blame]975 Perform a Release (Optimized) build without assertions enabled.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]976 <br><br>
Chris Lattnerd4651262006-03-21 01:10:57 +0000[diff] [blame]977
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]978 <dt><tt>gmake ENABLE_PROFILING=1</tt>
979 <dd>
980 Perform a Profiling build.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]981 <br><br>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]982
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]983 <dt><tt>gmake VERBOSE=1</tt>
984 <dd>
985 Print what <tt>gmake</tt> is doing on standard output.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]986 <br><br>
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]987
988 <dt><tt>gmake TOOL_VERBOSE=1</tt></dt>
989 <dd>Ask each tool invoked by the makefiles to print out what it is doing on
John Criswell3d8ba512004-12-08 17:53:54 +0000[diff] [blame]990 the standard output. This also implies <tt>VERBOSE=1</tt>.
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]991 <br><br></dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]992</dl>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]993
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]994<p>Every directory in the LLVM object tree includes a <tt>Makefile</tt> to build
995it and any subdirectories that it contains. Entering any directory inside the
996LLVM object tree and typing <tt>gmake</tt> should rebuild anything in or below
997that directory that is out of date.</p>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]998
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]999</div>
John Criswell20d2d3e2003-10-10 14:26:14 +0000[diff] [blame]1000
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1001<!-- ======================================================================= -->
1002<div class="doc_subsection">
Reid Spencerd30a9712006-07-27 06:41:31 +0000[diff] [blame]1003 <a name="cross-compile">Cross-Compiling LLVM</a>
Reid Spencer17850ef2006-07-27 05:43:30 +0000[diff] [blame]1004</div>
1005
1006<div class="doc_text">
Reid Spencerd30a9712006-07-27 06:41:31 +0000[diff] [blame]1007 <p>It is possible to cross-compile LLVM. That is, you can create LLVM
1008 executables and libraries for a platform different than the one one which you
1009 are compiling. To do this, a few additional steps are
1010 required. <sup><a href="#ccn_1">1</a></sup> To cross-compile LLVM, use
Reid Spencer17850ef2006-07-27 05:43:30 +0000[diff] [blame]1011 these instructions:</p>
1012 <ol>
Reid Spencerd30a9712006-07-27 06:41:31 +0000[diff] [blame]1013 <li>Configure and build LLVM as a native compiler. You will need
Reid Spencer17850ef2006-07-27 05:43:30 +0000[diff] [blame]1014 just <tt>TableGen</tt> from that build.
1015 <ul>
1016 <li>If you have <tt>$LLVM_OBJ_ROOT=$LLVM_SRC_ROOT</tt> just execute
1017 <tt>make -C utils/TableGen</tt> after configuring.</li>
1018 <li>Otherwise you will need to monitor building process and terminate
1019 it just after <tt>TableGen</tt> was built.</li>
1020 </ul>
1021 </li>
1022 <li>Copy the TableGen binary to somewhere safe (out of your build tree).
1023 </li>
Reid Spencerd30a9712006-07-27 06:41:31 +0000[diff] [blame]1024 <li>Configure LLVM to build with a cross-compiler. To do this, supply the
Reid Spencer17850ef2006-07-27 05:43:30 +0000[diff] [blame]1025 configure script with <tt>--build</tt> and <tt>--host</tt> options that
Reid Spencerd30a9712006-07-27 06:41:31 +0000[diff] [blame]1026 are different. The values of these options must be legal target triples
1027 that your GCC compiler supports.</li>
Reid Spencer17850ef2006-07-27 05:43:30 +0000[diff] [blame]1028 <li>Put the saved <tt>TableGen</tt> executable into the
1029 into <tt>$LLVM_OBJ_ROOT/{BUILD_TYPE}/bin</tt> directory (e.g. into
1030 <tt>.../Release/bin</tt> for a Release build).</li>
1031 <li>Build LLVM as usual.</li>
1032 </ol>
Reid Spencerd30a9712006-07-27 06:41:31 +0000[diff] [blame]1033 <p>The result of such a build will produce executables that are not executable
1034 on your build host (--build option) but can be executed on your compile host
1035 (--host option).</p>
Reid Spencer17850ef2006-07-27 05:43:30 +0000[diff] [blame]1036 <p><b>Notes:</b></p>
1037 <div class="doc_notes">
1038 <ol>
1039 <li><a name="ccn_1">Cross-compiling</a> was tested only with Linux as
1040 build platform and Windows as host using mingw32 cross-compiler. Other
1041 combinations have not been tested.</li>
1042 </ol>
1043 </div>
1044</div>
1045
1046<!-- ======================================================================= -->
1047<div class="doc_subsection">
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1048 <a name="objfiles">The Location of LLVM Object Files</a>
1049</div>
John Criswell20d2d3e2003-10-10 14:26:14 +0000[diff] [blame]1050
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1051<div class="doc_text">
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]1052
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1053<p>The LLVM build system is capable of sharing a single LLVM source tree among
1054several LLVM builds. Hence, it is possible to build LLVM for several different
1055platforms or configurations using the same source tree.</p>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]1056
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1057<p>This is accomplished in the typical autoconf manner:</p>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]1058
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1059<ul>
1060 <li><p>Change directory to where the LLVM object files should live:</p>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]1061
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1062 <p><tt>cd <i>OBJ_ROOT</i></tt></p></li>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]1063
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1064 <li><p>Run the <tt>configure</tt> script found in the LLVM source
1065 directory:</p>
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]1066
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1067 <p><tt><i>SRC_ROOT</i>/configure</tt></p></li>
1068</ul>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1069
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1070<p>The LLVM build will place files underneath <i>OBJ_ROOT</i> in directories
1071named after the build type:</p>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1072
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1073<dl>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1074 <dt>Debug Builds
1075 <dd>
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1076 <dl>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1077 <dt>Tools
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]1078 <dd><tt><i>OBJ_ROOT</i>/Debug/bin</tt>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1079 <dt>Libraries
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]1080 <dd><tt><i>OBJ_ROOT</i>/Debug/lib</tt>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1081 </dl>
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1082 <br><br>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1083
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1084 <dt>Release Builds
1085 <dd>
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1086 <dl>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1087 <dt>Tools
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]1088 <dd><tt><i>OBJ_ROOT</i>/Release/bin</tt>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1089 <dt>Libraries
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]1090 <dd><tt><i>OBJ_ROOT</i>/Release/lib</tt>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1091 </dl>
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1092 <br><br>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1093
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1094 <dt>Profile Builds
1095 <dd>
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1096 <dl>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1097 <dt>Tools
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]1098 <dd><tt><i>OBJ_ROOT</i>/Profile/bin</tt>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1099 <dt>Libraries
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]1100 <dd><tt><i>OBJ_ROOT</i>/Profile/lib</tt>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1101 </dl>
1102</dl>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1103
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1104</div>
Chris Lattner7fe7f812002-07-24 19:51:14 +0000[diff] [blame]1105
Chris Lattnera553f622004-03-25 20:38:40 +0000[diff] [blame]1106<!-- ======================================================================= -->
1107<div class="doc_subsection">
1108 <a name="optionalconfig">Optional Configuration Items</a>
1109</div>
1110
1111<div class="doc_text">
1112
1113<p>
Misha Brukman9106eca2005-02-03 22:25:23 +0000[diff] [blame]1114If you're running on a Linux system that supports the "<a
Reid Spencer66db92e2004-12-08 16:51:31 +0000[diff] [blame]1115 href="http://www.tat.physik.uni-tuebingen.de/~rguenth/linux/binfmt_misc.html">
1116 binfmt_misc</a>"
Chris Lattnera553f622004-03-25 20:38:40 +0000[diff] [blame]1117module, and you have root access on the system, you can set your system up to
1118execute LLVM bytecode files directly. To do this, use commands like this (the
1119first command may not be required if you are already using the module):</p>
1120
Misha Brukman9106eca2005-02-03 22:25:23 +0000[diff] [blame]1121<div class="doc_code">
Chris Lattnera553f622004-03-25 20:38:40 +0000[diff] [blame]1122<pre>
1123 $ mount -t binfmt_misc none /proc/sys/fs/binfmt_misc
Misha Brukman9106eca2005-02-03 22:25:23 +0000[diff] [blame]1124 $ echo ':llvm:M::llvm::/path/to/lli:' &gt; /proc/sys/fs/binfmt_misc/register
Chris Lattnera553f622004-03-25 20:38:40 +0000[diff] [blame]1125 $ chmod u+x hello.bc (if needed)
1126 $ ./hello.bc
1127</pre>
Misha Brukman9106eca2005-02-03 22:25:23 +0000[diff] [blame]1128</div>
Chris Lattnera553f622004-03-25 20:38:40 +0000[diff] [blame]1129
1130<p>
1131This allows you to execute LLVM bytecode files directly. Thanks to Jack
1132Cummings for pointing this out!
1133</p>
1134
1135</div>
1136
1137
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1138<!-- *********************************************************************** -->
1139<div class="doc_section">
1140 <a name="layout"><b>Program Layout</b></a>
1141</div>
1142<!-- *********************************************************************** -->
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1143
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1144<div class="doc_text">
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1145
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1146<p>One useful source of information about the LLVM source base is the LLVM <a
John Criswell364cec42004-03-12 20:31:37 +0000[diff] [blame]1147href="http://www.doxygen.org">doxygen</a> documentation available at <tt><a
Reid Spencer05fe4b02006-03-14 05:39:39 +0000[diff] [blame]1148href="http://llvm.org/doxygen/">http://llvm.org/doxygen/</a></tt>.
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1149The following is a brief introduction to code layout:</p>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1150
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1151</div>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1152
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1153<!-- ======================================================================= -->
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1154<div class="doc_subsection"><a name="cvsdir"><tt>CVS</tt> directories</a></div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1155<div class="doc_text">
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1156<p>Every directory checked out of CVS will contain a <tt>CVS</tt> directory; for
1157the most part these can just be ignored.</p>
Reid Spencerc4b09ba2004-12-08 16:18:26 +0000[diff] [blame]1158</div>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1159
Reid Spencerc4b09ba2004-12-08 16:18:26 +0000[diff] [blame]1160<!-- ======================================================================= -->
1161<div class="doc_subsection"><a name="examples"><tt>llvm/examples</tt></a></div>
1162<div class="doc_text">
1163 <p>This directory contains some simple examples of how to use the LLVM IR and
1164 JIT.</p>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1165</div>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1166
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1167<!-- ======================================================================= -->
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1168<div class="doc_subsection"><a name="include"><tt>llvm/include</tt></a></div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1169<div class="doc_text">
1170
1171<p>This directory contains public header files exported from the LLVM
1172library. The three main subdirectories of this directory are:</p>
1173
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1174<dl>
1175 <dt><tt><b>llvm/include/llvm</b></tt></dt>
1176 <dd>This directory contains all of the LLVM specific header files. This
1177 directory also has subdirectories for different portions of LLVM:
1178 <tt>Analysis</tt>, <tt>CodeGen</tt>, <tt>Target</tt>, <tt>Transforms</tt>,
1179 etc...</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1180
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1181 <dt><tt><b>llvm/include/llvm/Support</b></tt></dt>
1182 <dd>This directory contains generic support libraries that are provided with
1183 LLVM but not necessarily specific to LLVM. For example, some C++ STL utilities
1184 and a Command Line option processing library store their header files here.
1185 </dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1186
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1187 <dt><tt><b>llvm/include/llvm/Config</b></tt></dt>
1188 <dd>This directory contains header files configured by the <tt>configure</tt>
1189 script. They wrap "standard" UNIX and C header files. Source code can
1190 include these header files which automatically take care of the conditional
1191 #includes that the <tt>configure</tt> script generates.</dd>
1192</dl>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1193</div>
1194
1195<!-- ======================================================================= -->
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1196<div class="doc_subsection"><a name="lib"><tt>llvm/lib</tt></a></div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1197<div class="doc_text">
1198
1199<p>This directory contains most of the source files of the LLVM system. In LLVM,
1200almost all code exists in libraries, making it very easy to share code among the
1201different <a href="#tools">tools</a>.</p>
1202
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1203<dl>
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1204 <dt><tt><b>llvm/lib/VMCore/</b></tt></dt>
1205 <dd> This directory holds the core LLVM source files that implement core
1206 classes like Instruction and BasicBlock.</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1207
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1208 <dt><tt><b>llvm/lib/AsmParser/</b></tt></dt>
1209 <dd>This directory holds the source code for the LLVM assembly language parser
1210 library.</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1211
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1212 <dt><tt><b>llvm/lib/ByteCode/</b></tt></dt>
1213 <dd>This directory holds code for reading and write LLVM bytecode.</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1214
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1215 <dt><tt><b>llvm/lib/Analysis/</b></tt><dd>This directory contains a variety of
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1216 different program analyses, such as Dominator Information, Call Graphs,
1217 Induction Variables, Interval Identification, Natural Loop Identification,
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1218 etc.</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1219
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1220 <dt><tt><b>llvm/lib/Transforms/</b></tt></dt>
1221 <dd> This directory contains the source code for the LLVM to LLVM program
1222 transformations, such as Aggressive Dead Code Elimination, Sparse Conditional
1223 Constant Propagation, Inlining, Loop Invariant Code Motion, Dead Global
1224 Elimination, and many others.</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1225
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1226 <dt><tt><b>llvm/lib/Target/</b></tt></dt>
1227 <dd> This directory contains files that describe various target architectures
Chris Lattner2a607032006-04-20 17:42:23 +0000[diff] [blame]1228 for code generation. For example, the <tt>llvm/lib/Target/X86</tt>
1229 directory holds the X86 machine description while
John Criswell8bfe6a72005-05-18 19:43:33 +0000[diff] [blame]1230 <tt>llvm/lib/Target/CBackend</tt> implements the LLVM-to-C converter.</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1231
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1232 <dt><tt><b>llvm/lib/CodeGen/</b></tt></dt>
1233 <dd> This directory contains the major parts of the code generator: Instruction
1234 Selector, Instruction Scheduling, and Register Allocation.</dd>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1235
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1236 <dt><tt><b>llvm/lib/Debugger/</b></tt></dt>
1237 <dd> This directory contains the source level debugger library that makes
1238 it possible to instrument LLVM programs so that a debugger could identify
1239 source code locations at which the program is executing.</dd>
1240
1241 <dt><tt><b>llvm/lib/ExecutionEngine/</b></tt></dt>
1242 <dd> This directory contains libraries for executing LLVM bytecode directly
1243 at runtime in both interpreted and JIT compiled fashions.</dd>
1244
1245 <dt><tt><b>llvm/lib/Support/</b></tt></dt>
1246 <dd> This directory contains the source code that corresponds to the header
1247 files located in <tt>llvm/include/Support/</tt>.</dd>
1248
1249 <dt><tt><b>llvm/lib/System/</b></tt></dt>
1250 <dd>This directory contains the operating system abstraction layer that
1251 shields LLVM from platform-specific coding.</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1252</dl>
John Criswell7a73b802003-06-30 21:59:07 +0000[diff] [blame]1253
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1254</div>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1255
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1256<!-- ======================================================================= -->
Reid Spencerc4b09ba2004-12-08 16:18:26 +0000[diff] [blame]1257<div class="doc_subsection"><a name="projects"><tt>llvm/projects</tt></a></div>
1258<div class="doc_text">
1259 <p>This directory contains projects that are not strictly part of LLVM but are
1260 shipped with LLVM. This is also the directory where you should create your own
1261 LLVM-based projects. See <tt>llvm/projects/sample</tt> for an example of how
1262 to set up your own project. See <tt>llvm/projects/Stacker</tt> for a fully
1263 functional example of a compiler front end.</p>
1264</div>
1265
1266<!-- ======================================================================= -->
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1267<div class="doc_subsection"><a name="runtime"><tt>llvm/runtime</tt></a></div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1268<div class="doc_text">
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1269
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1270<p>This directory contains libraries which are compiled into LLVM bytecode and
1271used when linking programs with the GCC front end. Most of these libraries are
1272skeleton versions of real libraries; for example, libc is a stripped down
1273version of glibc.</p>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1274
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1275<p>Unlike the rest of the LLVM suite, this directory needs the LLVM GCC front
1276end to compile.</p>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1277
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1278</div>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1279
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1280<!-- ======================================================================= -->
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1281<div class="doc_subsection"><a name="test"><tt>llvm/test</tt></a></div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1282<div class="doc_text">
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1283 <p>This directory contains feature and regression tests and other basic sanity
1284 checks on the LLVM infrastructure. These are intended to run quickly and cover
1285 a lot of territory without being exhaustive.</p>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1286</div>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1287
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1288<!-- ======================================================================= -->
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1289<div class="doc_subsection"><a name="llvmtest"><tt>llvm-test</tt></a></div>
1290<div class="doc_text">
John Criswell3d8ba512004-12-08 17:53:54 +0000[diff] [blame]1291 <p>This is not a directory in the normal llvm module; it is a separate CVS
Misha Brukmane12215f2004-11-15 23:20:51 +0000[diff] [blame]1292 module that must be checked out (usually to <tt>projects/llvm-test</tt>). This
John Criswell3d8ba512004-12-08 17:53:54 +0000[diff] [blame]1293 module contains a comprehensive correctness, performance, and benchmarking
1294 test
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1295 suite for LLVM. It is a separate CVS module because not every LLVM user is
John Criswell838bce52005-05-09 16:39:27 +0000[diff] [blame]1296 interested in downloading or building such a comprehensive test suite. For
1297 further details on this test suite, please see the
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1298 <a href="TestingGuide.html">Testing Guide</a> document.</p>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1299</div>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1300
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1301<!-- ======================================================================= -->
1302<div class="doc_subsection"><a name="tools"><tt>llvm/tools</tt></a></div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1303<div class="doc_text">
John Criswell20d2d3e2003-10-10 14:26:14 +0000[diff] [blame]1304
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1305<p>The <b>tools</b> directory contains the executables built out of the
1306libraries above, which form the main part of the user interface. You can
1307always get help for a tool by typing <tt>tool_name --help</tt>. The
Misha Brukmane12215f2004-11-15 23:20:51 +0000[diff] [blame]1308following is a brief introduction to the most important tools. More detailed
1309information is in the <a href="CommandGuide/index.html">Command Guide</a>.</p>
John Criswell20d2d3e2003-10-10 14:26:14 +0000[diff] [blame]1310
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1311<dl>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1312
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1313 <dt><tt><b>bugpoint</b></tt></dt>
1314 <dd><tt>bugpoint</tt> is used to debug
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1315 optimization passes or code generation backends by narrowing down the
1316 given test case to the minimum number of passes and/or instructions that
1317 still cause a problem, whether it is a crash or miscompilation. See <a
1318 href="HowToSubmitABug.html">HowToSubmitABug.html</a> for more information
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1319 on using <tt>bugpoint</tt>.</dd>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1320
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1321 <dt><tt><b>llvmc</b></tt></dt>
1322 <dd>The LLVM Compiler Driver. This program can
1323 be configured to utilize both LLVM and non-LLVM compilation tools to enable
1324 pre-processing, translation, optimization, assembly, and linking of programs
1325 all from one command line. <tt>llvmc</tt> also takes care of processing the
1326 dependent libraries found in bytecode. This reduces the need to get the
Reid Spencer079e9452004-12-08 18:00:30 +0000[diff] [blame]1327 traditional <tt>-l&lt;name&gt;</tt> options right on the command line. Please
John Criswell8bfe6a72005-05-18 19:43:33 +0000[diff] [blame]1328 note that this tool, while functional, is still experimental and not feature
1329 complete.</dd>
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1330
1331 <dt><tt><b>llvm-ar</b></tt></dt>
1332 <dd>The archiver produces an archive containing
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1333 the given LLVM bytecode files, optionally with an index for faster
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1334 lookup.</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1335
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1336 <dt><tt><b>llvm-as</b></tt></dt>
1337 <dd>The assembler transforms the human readable LLVM assembly to LLVM
1338 bytecode.</dd>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1339
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1340 <dt><tt><b>llvm-dis</b></tt></dt>
1341 <dd>The disassembler transforms the LLVM bytecode to human readable
1342 LLVM assembly.</dd>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1343
Reid Spencer079e9452004-12-08 18:00:30 +0000[diff] [blame]1344 <dt><tt><b>llvm-ld</b></tt></dt>
1345 <dd><tt>llvm-ld</tt> is very similar to gccld and provides a general purpose
1346 and extensible linker for LLVM. This is the linker invoked by <tt>llvmc</tt>.
1347 It allows optimization modules to be loaded so that language specific
John Criswell8bfe6a72005-05-18 19:43:33 +0000[diff] [blame]1348 optimizations can be applied at link time. This tool is considered
1349 experimental.</dd>
Reid Spencer079e9452004-12-08 18:00:30 +0000[diff] [blame]1350
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1351 <dt><tt><b>llvm-link</b></tt></dt>
1352 <dd><tt>llvm-link</tt>, not surprisingly, links multiple LLVM modules into
1353 a single program.</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1354
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1355 <dt><tt><b>lli</b></tt></dt>
1356 <dd><tt>lli</tt> is the LLVM interpreter, which
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1357 can directly execute LLVM bytecode (although very slowly...). In addition
1358 to a simple interpreter, <tt>lli</tt> also has a tracing mode (entered by
1359 specifying <tt>-trace</tt> on the command line). Finally, for
John Criswelld9eceee2004-12-08 18:04:14 +0000[diff] [blame]1360 architectures that support it (currently x86, Sparc, and PowerPC), by default,
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1361 <tt>lli</tt> will function as a Just-In-Time compiler (if the
1362 functionality was compiled in), and will execute the code <i>much</i>
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1363 faster than the interpreter.</dd>
Misha Brukmanef0ad412003-10-06 19:23:34 +0000[diff] [blame]1364
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1365 <dt><tt><b>llc</b></tt></dt>
1366 <dd> <tt>llc</tt> is the LLVM backend compiler, which
John Criswell8bfe6a72005-05-18 19:43:33 +0000[diff] [blame]1367 translates LLVM bytecode to a native code assembly file or to C code (with
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1368 the -march=c option).</dd>
Misha Brukmanef0ad412003-10-06 19:23:34 +0000[diff] [blame]1369
Reid Spencerd4694f92004-12-22 06:29:07 +0000[diff] [blame]1370 <dt><tt><b>llvm-gcc</b></tt></dt>
1371 <dd><tt>llvm-gcc</tt> is a GCC-based C frontend
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1372 that has been retargeted to emit LLVM code as the machine code output. It
1373 works just like any other GCC compiler, taking the typical <tt>-c, -S, -E,
1374 -o</tt> options that are typically used. The source code for the
John Criswell8bfe6a72005-05-18 19:43:33 +0000[diff] [blame]1375 <tt>llvm-gcc</tt> tool is available as a separate CVS module.
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1376 <blockquote>
1377 <dl>
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1378 <dt><tt><b>gccas</b></tt></dt>
Reid Spencerd4694f92004-12-22 06:29:07 +0000[diff] [blame]1379 <dd>This tool is invoked by the <tt>llvm-gcc</tt> frontend as the
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1380 "assembler" part of the compiler. This tool actually assembles LLVM
1381 assembly to LLVM bytecode, performs a variety of optimizations, and
1382 outputs LLVM bytecode. Thus when you invoke
Reid Spencerd4694f92004-12-22 06:29:07 +0000[diff] [blame]1383 <tt>llvm-gcc -c x.c -o x.o</tt>, you are causing <tt>gccas</tt> to be
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1384 run, which writes the <tt>x.o</tt> file (which is an LLVM bytecode file
1385 that can be disassembled or manipulated just like any other bytecode
1386 file). The command line interface to <tt>gccas</tt> is designed to be
1387 as close as possible to the <b>system</b> `<tt>as</tt>' utility so that
1388 the gcc frontend itself did not have to be modified to interface to
1389 a "weird" assembler.</dd>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1390
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1391 <dt><tt><b>gccld</b></tt></dt>
1392 <dd><tt>gccld</tt> links together several LLVM bytecode files into one
1393 bytecode file and does some optimization. It is the linker invoked by
1394 the GCC frontend when multiple .o files need to be linked together.
1395 Like <tt>gccas</tt>, the command line interface of <tt>gccld</tt> is
1396 designed to match the system linker, to aid interfacing with the GCC
1397 frontend.</dd>
1398 </dl>
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1399 </blockquote>
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1400 </dd>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1401
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1402 <dt><tt><b>opt</b></tt></dt>
Reid Spencer84f82f72006-08-28 00:34:19 +0000[diff] [blame]1403 <dd><tt>opt</tt> reads LLVM bytecode, applies a series of LLVM to LLVM
1404 transformations (which are specified on the command line), and then outputs
1405 the resultant bytecode. The '<tt>opt --help</tt>' command is a good way to
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
1408 LLVM bytecode file and print out the results. It is primarily useful for
1409 debugging analyses, or familiarizing yourself with what an analysis does.</dd>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1410</dl>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1411</div>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1412
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1413<!-- ======================================================================= -->
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1414<div class="doc_subsection"><a name="utils"><tt>llvm/utils</tt></a></div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1415<div class="doc_text">
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1416
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1417<p>This directory contains utilities for working with LLVM source code, and some
1418of the utilities are actually required as part of the build process because they
1419are code generators for parts of LLVM infrastructure.</p>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1420
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1421<dl>
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1422 <dt><tt><b>codegen-diff</b></tt> <dd><tt>codegen-diff</tt> is a script
Misha Brukman00c73d22003-11-07 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 Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1426 manual, run <tt>`perldoc codegen-diff'</tt>.<br><br>
Misha Brukmanc103adf2003-08-11 18:45:46 +0000[diff] [blame]1427
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1428 <dt><tt><b>cvsupdate</b></tt> <dd><tt>cvsupdate</tt> is a script that will
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1429 update your CVS tree, but produce a much cleaner and more organized output
1430 than simply running <tt>`cvs -z3 up -dP'</tt> will. For example, it will group
1431 together all the new and updated files and modified files in separate
1432 sections, so you can see at a glance what has changed. If you are at the
1433 top of your LLVM CVS tree, running <tt>utils/cvsupdate</tt> is the
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1434 preferred way of updating the tree.<br><br>
Misha Brukmanc103adf2003-08-11 18:45:46 +0000[diff] [blame]1435
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1436 <dt><tt><b>emacs/</b></tt> <dd>The <tt>emacs</tt> directory contains
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1437 syntax-highlighting files which will work with Emacs and XEmacs editors,
1438 providing syntax highlighting support for LLVM assembly files and TableGen
1439 description files. For information on how to use the syntax files, consult
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1440 the <tt>README</tt> file in that directory.<br><br>
Misha Brukmanc103adf2003-08-11 18:45:46 +0000[diff] [blame]1441
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1442 <dt><tt><b>getsrcs.sh</b></tt> <dd>The <tt>getsrcs.sh</tt> script finds
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1443 and outputs all non-generated source files, which is useful if one wishes
1444 to do a lot of development across directories and does not want to
1445 individually find each file. One way to use it is to run, for example:
1446 <tt>xemacs `utils/getsources.sh`</tt> from the top of your LLVM source
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1447 tree.<br><br>
1448
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1449 <dt><tt><b>llvmgrep</b></tt></dt>
1450 <dd>This little tool performs an "egrep -H -n" on each source file in LLVM and
1451 passes to it a regular expression provided on <tt>llvmgrep</tt>'s command
1452 line. This is a very efficient way of searching the source base for a
1453 particular regular expression.</dd>
1454
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1455 <dt><tt><b>makellvm</b></tt> <dd>The <tt>makellvm</tt> script compiles all
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1456 files in the current directory and then compiles and links the tool that
1457 is the first argument. For example, assuming you are in the directory
1458 <tt>llvm/lib/Target/Sparc</tt>, if <tt>makellvm</tt> is in your path,
1459 simply running <tt>makellvm llc</tt> will make a build of the current
1460 directory, switch to directory <tt>llvm/tools/llc</tt> and build it,
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1461 causing a re-linking of LLC.<br><br>
Misha Brukmanc103adf2003-08-11 18:45:46 +0000[diff] [blame]1462
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1463 <dt><tt><b>NightlyTest.pl</b></tt> and
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1464 <tt><b>NightlyTestTemplate.html</b></tt> <dd>These files are used in a
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1465 cron script to generate nightly status reports of the functionality of
1466 tools, and the results can be seen by following the appropriate link on
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1467 the <a href="http://llvm.org/">LLVM homepage</a>.<br><br>
Misha Brukmanc103adf2003-08-11 18:45:46 +0000[diff] [blame]1468
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1469 <dt><tt><b>TableGen/</b></tt> <dd>The <tt>TableGen</tt> directory contains
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1470 the tool used to generate register descriptions, instruction set
1471 descriptions, and even assemblers from common TableGen description
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1472 files.<br><br>
Misha Brukmanc103adf2003-08-11 18:45:46 +0000[diff] [blame]1473
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1474 <dt><tt><b>vim/</b></tt> <dd>The <tt>vim</tt> directory contains
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1475 syntax-highlighting files which will work with the VIM editor, providing
1476 syntax highlighting support for LLVM assembly files and TableGen
1477 description files. For information on how to use the syntax files, consult
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1478 the <tt>README</tt> file in that directory.<br><br>
Misha Brukmanc103adf2003-08-11 18:45:46 +0000[diff] [blame]1479
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1480</dl>
Misha Brukmanc103adf2003-08-11 18:45:46 +0000[diff] [blame]1481
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1482</div>
Misha Brukmanc103adf2003-08-11 18:45:46 +0000[diff] [blame]1483
Reid Spencerc4b09ba2004-12-08 16:18:26 +0000[diff] [blame]1484<!-- ======================================================================= -->
1485<div class="doc_subsection"><a name="win32"><tt>llvm/win32</tt></a></div>
1486<div class="doc_text">
1487 <p>This directory contains build scripts and project files for use with
1488 Visual C++. This allows developers on Windows to build LLVM without the need
John Criswell3d8ba512004-12-08 17:53:54 +0000[diff] [blame]1489 for Cygwin. The contents of this directory should be considered experimental
Reid Spencerc4b09ba2004-12-08 16:18:26 +0000[diff] [blame]1490 at this time.
1491 </p>
1492</div>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1493<!-- *********************************************************************** -->
1494<div class="doc_section">
1495 <a name="tutorial">An Example Using the LLVM Tool Chain</a>
1496</div>
1497<!-- *********************************************************************** -->
Misha Brukmanc103adf2003-08-11 18:45:46 +0000[diff] [blame]1498
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1499<div class="doc_text">
Chris Lattner59075882007-01-04 07:08:27 +0000[diff] [blame]1500<p>This section gives an example of using LLVM. llvm-gcc3 is now obsolete,
1501so we only include instructiosn for llvm-gcc4.
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]1502</p>
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1503
1504<p><b>Note:</b> The <i>gcc4</i> frontend's invocation is <b><i>considerably different</i></b>
1505from the previous <i>gcc3</i> frontend. In particular, the <i>gcc4</i> frontend <b><i>does not</i></b>
1506create bytecode by default: <i>gcc4</i> produces native code. As the example below illustrates,
1507the '--emit-llvm' flag is needed to produce LLVM bytecode output. For <i>makefiles</i> and
1508<i>configure</i> scripts, the CFLAGS variable needs '--emit-llvm' to produce bytecode
1509output.</p>
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]1510</div>
1511
1512<!-- ======================================================================= -->
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1513<div class="doc_subsection"><a name="tutorial4">Example with llvm-gcc4</a></div>
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]1514
1515<div class="doc_text">
1516
1517<ol>
1518 <li>First, create a simple C file, name it 'hello.c':
1519 <pre>
1520 #include &lt;stdio.h&gt;
1521 int main() {
1522 printf("hello world\n");
1523 return 0;
1524 }
1525 </pre></li>
1526
1527 <li><p>Next, compile the C file into a native executable:</p>
1528
1529 <p><tt>% llvm-gcc hello.c -o hello</tt></p>
1530
1531 <p>Note that llvm-gcc works just like GCC by default. The standard -S and
1532 -c arguments work as usual (producing a native .s or .o file,
1533 respectively). </p>
1534
1535 <li><p>Next, compile the C file into a LLVM bytecode file:</p>
1536 <p><tt>% llvm-gcc -O3 -emit-llvm hello.c -c -o hello.bc</tt></p>
1537
1538 <p>The -emit-llvm option can be used with the -S or -c options to emit an
1539 LLVM ".ll" or ".bc" file (respectively) for the code. This allows you
1540 to use the <a href="CommandGuide/index.html">standard LLVM tools</a> on
1541 the bytecode file.</p>
1542
1543 <p>Unlike llvm-gcc3, llvm-gcc4 correctly responds to -O[0123] arguments.
1544 </p></li>
1545
1546 <li><p>Run the program in both forms. To run the program, use:</p>
1547
1548 <p><tt>% ./hello</tt></p>
1549
1550 <p>and</p>
1551
Chris Lattner6e3b7c22006-08-14 20:51:35 +0000[diff] [blame]1552 <p><tt>% lli hello.bc</tt></p>
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]1553
1554 <p>The second examples shows how to invoke the LLVM JIT, <a
Chris Lattner6e3b7c22006-08-14 20:51:35 +0000[diff] [blame]1555 href="CommandGuide/html/lli.html">lli</a>.</p></li>
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]1556
1557 <li><p>Use the <tt>llvm-dis</tt> utility to take a look at the LLVM assembly
1558 code:</p>
1559
Chris Lattner9abd8af2006-09-07 04:19:09 +0000[diff] [blame]1560 <p><tt>% llvm-dis &lt; hello.bc | less</tt><br><br></li>
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]1561
1562 <li><p>Compile the program to native assembly using the LLC code
1563 generator:</p>
1564
1565 <p><tt>% llc hello.bc -o hello.s</tt></p>
1566
1567 <li><p>Assemble the native assembly language file into a program:</p>
1568
1569 <p><b>Solaris:</b><tt>% /opt/SUNWspro/bin/cc -xarch=v9 hello.s -o hello.native</tt></p>
1570 <p><b>Others:</b><tt>% gcc hello.s -o hello.native</tt></p>
1571
1572 <li><p>Execute the native code program:</p>
1573
Chris Lattner6e3b7c22006-08-14 20:51:35 +0000[diff] [blame]1574 <p><tt>% ./hello.native</tt></p>
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]1575
1576 <p>Note that using llvm-gcc to compile directly to native code (i.e. when
1577 the -emit-llvm option is not present) does steps 6/7/8 for you.</p>
Chris Lattner6e3b7c22006-08-14 20:51:35 +0000[diff] [blame]1578 </li>
Chris Lattner5907d402006-08-14 20:45:25 +0000[diff] [blame]1579
1580</ol>
1581
1582</div>
1583
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1584
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1585<!-- *********************************************************************** -->
1586<div class="doc_section">
1587 <a name="problems">Common Problems</a>
1588</div>
1589<!-- *********************************************************************** -->
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]1590
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1591<div class="doc_text">
John Criswellce760f62003-07-03 16:01:38 +0000[diff] [blame]1592
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1593<p>If you are having problems building or using LLVM, or if you have any other
1594general questions about LLVM, please consult the <a href="FAQ.html">Frequently
1595Asked Questions</a> page.</p>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1596
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1597</div>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1598
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1599<!-- *********************************************************************** -->
1600<div class="doc_section">
1601 <a name="links">Links</a>
1602</div>
1603<!-- *********************************************************************** -->
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1604
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1605<div class="doc_text">
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1606
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1607<p>This document is just an <b>introduction</b> to how to use LLVM to do
1608some simple things... there are many more interesting and complicated things
1609that you can do that aren't documented here (but we'll gladly accept a patch
1610if you want to write something up!). For more information about LLVM, check
1611out:</p>
John Criswell85ed3612003-06-12 19:34:44 +0000[diff] [blame]1612
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1613<ul>
Reid Spencer05fe4b02006-03-14 05:39:39 +0000[diff] [blame]1614 <li><a href="http://llvm.org/">LLVM homepage</a></li>
1615 <li><a href="http://llvm.org/doxygen/">LLVM doxygen tree</a></li>
1616 <li><a href="http://llvm.org/docs/Projects.html">Starting a Project
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1617 that Uses LLVM</a></li>
1618</ul>
1619
1620</div>
1621
1622<!-- *********************************************************************** -->
1623
1624<hr>
Misha Brukman142207b2003-11-22 01:30:01 +0000[diff] [blame]1625<address>
Misha Brukman54111c42004-01-20 00:20:17 +0000[diff] [blame]1626 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
1627 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
1628 <a href="http://validator.w3.org/check/referer"><img
1629 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
1630
Misha Brukman142207b2003-11-22 01:30:01 +0000[diff] [blame]1631 <a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
Reid Spencer77d90192004-09-05 20:50:22 +0000[diff] [blame]1632 <a href="http://llvm.x10sys.com/rspencer/">Reid Spencer</a><br>
Reid Spencer05fe4b02006-03-14 05:39:39 +0000[diff] [blame]1633 <a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1634 Last modified: $Date$
Misha Brukman142207b2003-11-22 01:30:01 +0000[diff] [blame]1635</address>
Misha Brukman00c73d22003-11-07 19:43:14 +0000[diff] [blame]1636</body>
Guochun Shif4688a82002-07-17 23:05:56 +0000[diff] [blame]1637</html>