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gerrit-public.fairphone.software / toolchain / llvm-project / d745adedd7d06981e8fec333da008c6bf8ec8678 / . / llvm / docs / GettingStarted.html
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Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukman560e9892003-11-07 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 Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]10
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]11<div class="doc_title">
12 Getting Started with the LLVM System
13</div>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]14
Misha Brukman560e9892003-11-07 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 Lattnerc0bda0d2003-02-14 04:22:13 +0000[diff] [blame]19 <ol>
Chris Lattner059a8df2007-11-01 04:20:16 +0000[diff] [blame]20 <li><a href="#hardware">Hardware</a></li>
21 <li><a href="#software">Software</a></li>
22 <li><a href="#brokengcc">Broken versions of GCC and other tools</a></li>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]23 </ol></li>
John Criswell3ef61af2003-06-30 21:59:07 +0000[diff] [blame]24
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]25 <li><a href="#starting">Getting Started with LLVM</a>
John Criswell71139f22003-07-08 20:35:59 +0000[diff] [blame]26 <ol>
Chris Lattner059a8df2007-11-01 04:20:16 +0000[diff] [blame]27 <li><a href="#terminology">Terminology and Notation</a></li>
28 <li><a href="#environment">Setting Up Your Environment</a></li>
29 <li><a href="#unpack">Unpacking the LLVM Archives</a></li>
30 <li><a href="#checkout">Checkout LLVM from Subversion</a></li>
31 <li><a href="#installcf">Install the GCC Front End</a></li>
32 <li><a href="#config">Local LLVM Configuration</a></li>
33 <li><a href="#compile">Compiling the LLVM Suite Source Code</a></li>
34 <li><a href="#cross-compile">Cross-Compiling LLVM</a></li>
35 <li><a href="#objfiles">The Location of LLVM Object Files</a></li>
36 <li><a href="#optionalconfig">Optional Configuration Items</a></li>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]37 </ol></li>
John Criswell71139f22003-07-08 20:35:59 +0000[diff] [blame]38
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]39 <li><a href="#layout">Program layout</a>
40 <ol>
Chris Lattner059a8df2007-11-01 04:20:16 +0000[diff] [blame]41 <li><a href="#examples"><tt>llvm/examples</tt></a></li>
42 <li><a href="#include"><tt>llvm/include</tt></a></li>
43 <li><a href="#lib"><tt>llvm/lib</tt></a></li>
44 <li><a href="#projects"><tt>llvm/projects</tt></a></li>
45 <li><a href="#runtime"><tt>llvm/runtime</tt></a></li>
46 <li><a href="#test"><tt>llvm/test</tt></a></li>
47 <li><a href="#llvmtest"><tt>llvm-test</tt></a></li>
48 <li><a href="#tools"><tt>llvm/tools</tt></a></li>
49 <li><a href="#utils"><tt>llvm/utils</tt></a></li>
50 <li><a href="#win32"><tt>llvm/win32</tt></a></li>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]51 </ol></li>
John Criswellf531f312003-10-27 18:18:16 +0000[diff] [blame]52
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]53 <li><a href="#tutorial">An Example Using the LLVM Tool Chain</a>
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]54 <ol>
55 <li><a href="#tutorial4">Example with llvm-gcc4</a></li>
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]56 </ol>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]57 <li><a href="#problems">Common Problems</a>
58 <li><a href="#links">Links</a>
59</ul>
60
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]61<div class="doc_author">
62 <p>Written by:
63 <a href="mailto:criswell@uiuc.edu">John Criswell</a>,
64 <a href="mailto:sabre@nondot.org">Chris Lattner</a>,
65 <a href="http://misha.brukman.net">Misha Brukman</a>,
66 <a href="http://www.cs.uiuc.edu/~vadve">Vikram Adve</a>, and
67 <a href="mailto:gshi1@uiuc.edu">Guochun Shi</a>.
68 </p>
69</div>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]70
71
72<!-- *********************************************************************** -->
73<div class="doc_section">
74 <a name="overview"><b>Overview</b></a>
75</div>
76<!-- *********************************************************************** -->
77
78<div class="doc_text">
79
80<p>Welcome to LLVM! In order to get started, you first need to know some
81basic information.</p>
82
83<p>First, LLVM comes in two pieces. The first piece is the LLVM suite. This
84contains all of the tools, libraries, and header files needed to use the low
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]85level virtual machine. It contains an assembler, disassembler, bitcode
86analyzer and bitcode optimizer. It also contains a test suite that can be
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]87used to test the LLVM tools and the GCC front end.</p>
88
89<p>The second piece is the GCC front end. This component provides a version of
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]90GCC that compiles C and C++ code into LLVM bitcode. Currently, the GCC front
Chris Lattner40872ad2007-03-06 06:27:34 +0000[diff] [blame]91end uses the GCC parser to convert code to LLVM. Once
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]92compiled into LLVM bitcode, a program can be manipulated with the LLVM tools
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]93from the LLVM suite.</p>
94
John Criswell6ab273c2004-12-08 17:53:54 +0000[diff] [blame]95<p>
96There is a third, optional piece called llvm-test. It is a suite of programs
97with a testing harness that can be used to further test LLVM's functionality
98and performance.
99</p>
100
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]101</div>
102
103<!-- *********************************************************************** -->
104<div class="doc_section">
105 <a name="quickstart"><b>Getting Started Quickly (A Summary)</b></a>
106</div>
107<!-- *********************************************************************** -->
108
109<div class="doc_text">
110
111<p>Here's the short story for getting up and running quickly with LLVM:</p>
112
113<ol>
Reid Spencer3fbf26a2004-11-08 00:29:22 +0000[diff] [blame]114 <li>Read the documentation.</li>
115 <li>Read the documentation.</li>
116 <li>Remember that you were warned twice about reading the documentation.</li>
Tanya Lattnerc7972312008-04-07 18:32:25 +0000[diff] [blame]117 <li>Install the llvm-gcc4.2 front end if you intend to compile C or C++:
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]118 <ol>
Reid Spencer788b0fd2004-12-22 06:29:07 +0000[diff] [blame]119 <li><tt>cd <i>where-you-want-the-C-front-end-to-live</i></tt></li>
Tanya Lattnerda2d1e22006-11-20 06:04:46 +0000[diff] [blame]120 <li><tt>gunzip --stdout llvm-gcc.<i>platform</i>.tar.gz | tar -xvf -</tt>
Reid Spencer788b0fd2004-12-22 06:29:07 +0000[diff] [blame]121 </li>
Chris Lattner26c74442008-11-09 17:19:14 +0000[diff] [blame]122 <li>Note: If the binary extension is ".bz" use bunzip2 instead of gunzip.</li>
Tanya Lattnerda2d1e22006-11-20 06:04:46 +0000[diff] [blame]123 <li>Add llvm-gcc's "bin" directory to your PATH variable.</li>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]124 </ol></li>
125
Misha Brukman20b8a6562005-02-03 22:25:23 +0000[diff] [blame]126 <li>Get the LLVM Source Code
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]127 <ul>
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]128 <li>With the distributed files (or use <a href="#checkout">SVN</a>):
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]129 <ol>
130 <li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
John Criswell64f13ab2004-03-12 20:31:37 +0000[diff] [blame]131 <li><tt>gunzip --stdout llvm-<i>version</i>.tar.gz | tar -xvf -</tt>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]132 </ol></li>
133
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]134 </ul></li>
135
Misha Brukman20b8a6562005-02-03 22:25:23 +0000[diff] [blame]136 <li><b>[Optional]</b> Get the Test Suite Source Code
John Criswelldfe6a862004-12-10 15:51:16 +0000[diff] [blame]137 <ul>
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]138 <li>With the distributed files (or use <a href="#checkout">SVN</a>):
John Criswelldfe6a862004-12-10 15:51:16 +0000[diff] [blame]139 <ol>
140 <li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
141 <li><tt>cd llvm/projects</tt>
142 <li><tt>gunzip --stdout llvm-test-<i>version</i>.tar.gz | tar -xvf -</tt>
John Criswelldfe6a862004-12-10 15:51:16 +0000[diff] [blame]143 </ol></li>
144
John Criswelldfe6a862004-12-10 15:51:16 +0000[diff] [blame]145 </ul></li>
146
147
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]148 <li>Configure the LLVM Build Environment
149 <ol>
Misha Brukman20b8a6562005-02-03 22:25:23 +0000[diff] [blame]150 <li><tt>cd <i>where-you-want-to-build-llvm</i></tt></li>
151 <li><tt><i>/path/to/llvm/</i>configure [options]</tt><br>
152 Some common options:
153
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]154 <ul>
Reid Spencer788b0fd2004-12-22 06:29:07 +0000[diff] [blame]155 <li><tt>--prefix=<i>directory</i></tt>
156 <p>Specify for <i>directory</i> the full pathname of where you
Misha Brukman20b8a6562005-02-03 22:25:23 +0000[diff] [blame]157 want the LLVM tools and libraries to be installed (default
158 <tt>/usr/local</tt>).</p></li>
Reid Spencer6bfa7a42004-12-26 05:47:26 +0000[diff] [blame]159 <li><tt>--with-llvmgccdir=<i>directory</i></tt>
160 <p>Optionally, specify for <i>directory</i> the full pathname of the
John Criswellcfdeb5c2005-05-09 16:39:27 +0000[diff] [blame]161 C/C++ front end installation to use with this LLVM configuration. If
Reid Spencer6bfa7a42004-12-26 05:47:26 +0000[diff] [blame]162 not specified, the PATH will be searched.</p></li>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]163 <li><tt>--enable-spec2000=<i>directory</i></tt>
164 <p>Enable the SPEC2000 benchmarks for testing. The SPEC2000
165 benchmarks should be available in
166 <tt><i>directory</i></tt>.</p></li>
167 </ul>
168 </ol></li>
169
170 <li>Build the LLVM Suite:
171 <ol>
Chris Lattnere0050f02004-07-18 22:32:22 +0000[diff] [blame]172 <li><tt>gmake -k |&amp; tee gnumake.out
173 &nbsp;&nbsp;&nbsp;# this is csh or tcsh syntax</tt></li>
Chris Lattner13ce9182007-01-04 07:06:05 +0000[diff] [blame]174 <li>If you get an "internal compiler error (ICE)" or test failures, see
175 <a href="#brokengcc">below</a>.</li>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]176 </ol>
177
178</ol>
179
Chris Lattner53e5e2a2004-06-21 22:52:48 +0000[diff] [blame]180<p>Consult the <a href="#starting">Getting Started with LLVM</a> section for
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]181detailed information on configuring and compiling LLVM. See <a
182href="#environment">Setting Up Your Environment</a> for tips that simplify
183working with the GCC front end and LLVM tools. Go to <a href="#layout">Program
184Layout</a> to learn about the layout of the source code tree.</p>
185
186</div>
187
188<!-- *********************************************************************** -->
189<div class="doc_section">
190 <a name="requirements"><b>Requirements</b></a>
191</div>
192<!-- *********************************************************************** -->
193
194<div class="doc_text">
195
196<p>Before you begin to use the LLVM system, review the requirements given below.
197This may save you some trouble by knowing ahead of time what hardware and
198software you will need.</p>
199
200</div>
201
202<!-- ======================================================================= -->
203<div class="doc_subsection">
204 <a name="hardware"><b>Hardware</b></a>
205</div>
206
207<div class="doc_text">
208
209<p>LLVM is known to work on the following platforms:</p>
210
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]211<table cellpadding="3" summary="Known LLVM platforms">
Misha Brukmanb0681672004-11-15 05:19:53 +0000[diff] [blame]212<tr>
213 <th>OS</th>
214 <th>Arch</th>
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]215 <th>Compilers</th>
Misha Brukmanb0681672004-11-15 05:19:53 +0000[diff] [blame]216</tr>
217<tr>
218 <td>Linux</td>
Chris Lattnerac648f52005-02-09 21:15:51 +0000[diff] [blame]219 <td>x86<sup><a href="#pf_1">1</a></sup></td>
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]220 <td>GCC</td>
Misha Brukmanb0681672004-11-15 05:19:53 +0000[diff] [blame]221</tr>
222<tr>
223 <td>Solaris</td>
224 <td>V9 (Ultrasparc)</td>
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]225 <td>GCC</td>
Misha Brukmanb0681672004-11-15 05:19:53 +0000[diff] [blame]226</tr>
227<tr>
228 <td>FreeBSD</td>
Chris Lattnerac648f52005-02-09 21:15:51 +0000[diff] [blame]229 <td>x86<sup><a href="#pf_1">1</a></sup></td>
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]230 <td>GCC</td>
Misha Brukmanb0681672004-11-15 05:19:53 +0000[diff] [blame]231</tr>
232<tr>
Chris Lattnerac648f52005-02-09 21:15:51 +0000[diff] [blame]233 <td>MacOS X<sup><a href="#pf_2">2</a></sup></td>
Misha Brukmanb0681672004-11-15 05:19:53 +0000[diff] [blame]234 <td>PowerPC</td>
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]235 <td>GCC</td>
Misha Brukmanb0681672004-11-15 05:19:53 +0000[diff] [blame]236</tr>
237<tr>
Scott Michel4799ea72008-03-18 23:13:26 +0000[diff] [blame]238 <td>MacOS X<sup><a href="#pf_2">2</a>,<a href="#pf_9">9</a></sup></td>
Tanya Lattnerfb762912006-04-20 04:35:34 +0000[diff] [blame]239 <td>x86</td>
240 <td>GCC</td>
241
242</tr>
243<tr>
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]244 <td>Cygwin/Win32</td>
Chris Lattner9a964262006-07-21 00:06:27 +0000[diff] [blame]245 <td>x86<sup><a href="#pf_1">1</a>,<a href="#pf_8">8</a></sup></td>
Reid Spencera8acd822004-12-23 19:39:54 +0000[diff] [blame]246 <td>GCC 3.4.X, binutils 2.15</td>
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]247</tr>
Misha Brukman5ac308f2004-12-23 07:14:56 +0000[diff] [blame]248<tr>
Chris Lattner093ffb02005-02-09 20:43:48 +0000[diff] [blame]249 <td>MinGW/Win32</td>
Chris Lattner9a964262006-07-21 00:06:27 +0000[diff] [blame]250 <td>x86<sup><a href="#pf_1">1</a>,<a href="#pf_6">6</a>,<a href="#pf_8">8</a></sup></td>
Chris Lattner093ffb02005-02-09 20:43:48 +0000[diff] [blame]251 <td>GCC 3.4.X, binutils 2.15</td>
252</tr>
253<tr>
Misha Brukman5ac308f2004-12-23 07:14:56 +0000[diff] [blame]254 <td>Linux</td>
Dan Gohmand92243a2008-11-13 19:07:07 +0000[diff] [blame]255 <td>amd64</td>
Misha Brukman5ac308f2004-12-23 07:14:56 +0000[diff] [blame]256 <td>GCC</td>
257</tr>
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]258</table>
259
260<p>LLVM has partial support for the following platforms:</p>
261
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]262<table summary="LLVM partial platform support">
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]263<tr>
264 <th>OS</th>
265 <th>Arch</th>
266 <th>Compilers</th>
Misha Brukmanb0681672004-11-15 05:19:53 +0000[diff] [blame]267</tr>
Misha Brukmandca72382004-11-15 21:05:08 +0000[diff] [blame]268<tr>
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]269 <td>Windows</td>
Chris Lattnerac648f52005-02-09 21:15:51 +0000[diff] [blame]270 <td>x86<sup><a href="#pf_1">1</a></sup></td>
Nick Lewyckyd745ade2008-12-08 00:45:02 +0000[diff] [blame^]271 <td>Visual Studio 2005 SP1 or higher<sup><a href="#pf_4">4</a>,<a href="#pf_5">5</a></sup></td>
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]272<tr>
Chris Lattnerac648f52005-02-09 21:15:51 +0000[diff] [blame]273 <td>AIX<sup><a href="#pf_3">3</a>,<a href="#pf_4">4</a></sup></td>
Misha Brukmandca72382004-11-15 21:05:08 +0000[diff] [blame]274 <td>PowerPC</td>
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]275 <td>GCC</td>
276</tr>
277<tr>
Chris Lattnerac648f52005-02-09 21:15:51 +0000[diff] [blame]278 <td>Linux<sup><a href="#pf_3">3</a>,<a href="#pf_5">5</a></sup></td>
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]279 <td>PowerPC</td>
280 <td>GCC</td>
Misha Brukmandca72382004-11-15 21:05:08 +0000[diff] [blame]281</tr>
John Criswell05990f32005-05-09 16:49:59 +0000[diff] [blame]282
283<tr>
284 <td>Linux<sup><a href="#pf_7">7</a></sup></td>
285 <td>Alpha</td>
286 <td>GCC</td>
287</tr>
288<tr>
289 <td>Linux<sup><a href="#pf_7">7</a></sup></td>
290 <td>Itanium (IA-64)</td>
291 <td>GCC</td>
292</tr>
Duraid Madina332b16a2005-05-10 06:57:53 +0000[diff] [blame]293<tr>
294 <td>HP-UX<sup><a href="#pf_7">7</a></sup></td>
295 <td>Itanium (IA-64)</td>
296 <td>HP aCC</td>
297</tr>
Misha Brukmanb0681672004-11-15 05:19:53 +0000[diff] [blame]298</table>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]299
Misha Brukman77723092005-02-09 21:01:26 +0000[diff] [blame]300<p><b>Notes:</b></p>
301
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]302<div class="doc_notes">
303<ol>
304<li><a name="pf_1">Code generation supported for Pentium processors and
305up</a></li>
306<li><a name="pf_2">Code generation supported for 32-bit ABI only</a></li>
307<li><a name="pf_3">No native code generation</a></li>
Nick Lewyckyd745ade2008-12-08 00:45:02 +0000[diff] [blame^]308<li><a name="pf_4">Build is not complete: one or more tools do not link or function</a></li>
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]309<li><a name="pf_5">The GCC-based C/C++ frontend does not build</a></li>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]310<li><a name="pf_6">The port is done using the MSYS shell.</a>
Misha Brukman77723092005-02-09 21:01:26 +0000[diff] [blame]311<a href="http://www.mingw.org/MinGWiki/">Download</a> and install
Chris Lattner9a964262006-07-21 00:06:27 +0000[diff] [blame]312bison (excl. M4.exe) and flex in that order. Build binutils-2.15 from source,
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]313if necessary. Bison &amp; flex can be also grabbed from GNUWin32 sf.net
314project.</li>
John Criswell05990f32005-05-09 16:49:59 +0000[diff] [blame]315<li><a name="pf_7">Native code generation exists but is not complete.</a></li>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]316<li><a name="pf_8">Binutils</a> up to post-2.17 has bug in bfd/cofflink.c
Chris Lattner9a964262006-07-21 00:06:27 +0000[diff] [blame]317 preventing LLVM from building correctly. Several workarounds have been
318 introduced into LLVM build system, but the bug can occur anytime in the
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]319 future. We highly recommend that you rebuild your current binutils with the
Chris Lattner9a964262006-07-21 00:06:27 +0000[diff] [blame]320 patch from <a href="http://sourceware.org/bugzilla/show_bug.cgi?id=2659">
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]321 Binutils bugzilla</a>, if it wasn't already applied.</li>
Chris Lattner26c74442008-11-09 17:19:14 +0000[diff] [blame]322<li><a name="pf_9">XCode 2.5 and gcc 4.0.1</a> (Apple Build 5370) will trip
Scott Michel4799ea72008-03-18 23:13:26 +0000[diff] [blame]323 internal LLVM assert messages when compiled for Release at optimization
Chris Lattner26c74442008-11-09 17:19:14 +0000[diff] [blame]324 levels greater than 0 (i.e., <i>"-O1"</i> and higher).
325 Add <i>OPTIMIZE_OPTION="-O0"</i> to the build command line
Scott Michel4799ea72008-03-18 23:13:26 +0000[diff] [blame]326 if compiling for LLVM Release or bootstrapping the LLVM toolchain.</li>
Misha Brukman77723092005-02-09 21:01:26 +0000[diff] [blame]327</ol>
Misha Brukman77723092005-02-09 21:01:26 +0000[diff] [blame]328</div>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]329
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]330<p>Note that you will need about 1-3 GB of space for a full LLVM build in Debug
John Criswelle1a81202005-05-18 19:43:33 +0000[diff] [blame]331mode, depending on the system (it is so large because of all the debugging
332information and the fact that the libraries are statically linked into multiple
333tools). If you do not need many of the tools and you are space-conscious,
Misha Brukman1ed0fa52004-11-19 21:53:22 +0000[diff] [blame]334you can disable them individually in <tt>llvm/tools/Makefile</tt>. The Release
335build requires considerably less space.</p>
336
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]337<p>The LLVM suite <i>may</i> compile on other platforms, but it is not
338guaranteed to do so. If compilation is successful, the LLVM utilities should be
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]339able to assemble, disassemble, analyze, and optimize LLVM bitcode. Code
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]340generation should work as well, although the generated native code may not work
341on your platform.</p>
342
343<p>The GCC front end is not very portable at the moment. If you want to get it
Misha Brukman876d5f12004-08-09 19:57:01 +0000[diff] [blame]344to work on another platform, you can download a copy of the source and <a
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]345href="GCCFEBuildInstrs.html">try to compile it</a> on your platform.</p>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]346
347</div>
348
349<!-- ======================================================================= -->
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]350<div class="doc_subsection"><a name="software"><b>Software</b></a></div>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]351<div class="doc_text">
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]352 <p>Compiling LLVM requires that you have several software packages
353 installed. The table below lists those required packages. The Package column
354 is the usual name for the software package that LLVM depends on. The Version
355 column provides "known to work" versions of the package. The Notes column
356 describes how LLVM uses the package and provides other details.</p>
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]357 <table summary="Packages required to compile LLVM">
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]358 <tr><th>Package</th><th>Version</th><th>Notes</th></tr>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]359
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]360 <tr>
361 <td><a href="http://savannah.gnu.org/projects/make">GNU Make</a></td>
362 <td>3.79, 3.79.1</td>
363 <td>Makefile/build processor</td>
364 </tr>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]365
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]366 <tr>
367 <td><a href="http://gcc.gnu.org">GCC</a></td>
368 <td>3.4.2</td>
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]369 <td>C/C++ compiler<sup><a href="#sf1">1</a></sup></td>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]370 </tr>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]371
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]372 <tr>
Chris Lattnerf1705fd2005-09-06 04:07:15 +0000[diff] [blame]373 <td><a href="http://www.gnu.org/software/texinfo">TeXinfo</a></td>
374 <td>4.5</td>
375 <td>For building the CFE</td>
376 </tr>
377
378 <tr>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]379 <td><a href="http://www.gnu.org/software/flex">Flex</a></td>
380 <td>2.5.4</td>
381 <td>LEX compiler</td>
382 </tr>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]383
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]384 <tr>
385 <td><a href="http://www.gnu.org/software/bison/bison.html">Bison</a></td>
Jeff Cohen71201072006-01-04 06:51:22 +0000[diff] [blame]386 <td>1.28, 1.35, 1.75, 1.875d, 2.0, or 2.1<br>(not 1.85 or 1.875)</td>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]387 <td>YACC compiler</td>
388 </tr>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]389
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]390 <tr>
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]391 <td><a href="http://subversion.tigris.org/project_packages.html">SVN</a></td>
392 <td>&ge;1.3</td>
393 <td>Subversion access to LLVM<sup><a href="#sf2">2</a></sup></td>
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]394 </tr>
395
396 <tr>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]397 <td><a href="http://savannah.gnu.org/projects/dejagnu">DejaGnu</a></td>
398 <td>1.4.2</td>
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]399 <td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]400 </tr>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]401
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]402 <tr>
403 <td><a href="http://www.tcl.tk/software/tcltk/">tcl</a></td>
404 <td>8.3, 8.4</td>
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]405 <td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]406 </tr>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]407
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]408 <tr>
409 <td><a href="http://expect.nist.gov/">expect</a></td>
410 <td>5.38.0</td>
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]411 <td>Automated test suite<sup><a href="#sf3">3</a></sup></td>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]412 </tr>
413
414 <tr>
415 <td><a href="http://www.perl.com/download.csp">perl</a></td>
Reid Spencer098fce42004-12-09 17:55:37 +0000[diff] [blame]416 <td>&ge;5.6.0</td>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]417 <td>Nightly tester, utilities</td>
418 </tr>
419
420 <tr>
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]421 <td><a href="http://savannah.gnu.org/projects/m4">GNU M4</a>
422 <td>1.4</td>
423 <td>Macro processor for configuration<sup><a href="#sf4">4</a></sup></td>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]424 </tr>
425
426 <tr>
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]427 <td><a href="http://www.gnu.org/software/autoconf">GNU Autoconf</a></td>
428 <td>2.59</td>
429 <td>Configuration script builder<sup><a href="#sf4">4</a></sup></td>
430 </tr>
431
432 <tr>
433 <td><a href="http://www.gnu.org/software/automake">GNU Automake</a></td>
434 <td>1.9.2</td>
435 <td>aclocal macro generator<sup><a href="#sf4">4</a></sup></td>
436 </tr>
437
438 <tr>
439 <td><a href="http://savannah.gnu.org/projects/libtool">libtool</a></td>
440 <td>1.5.10</td>
441 <td>Shared library manager<sup><a href="#sf4">4</a></sup></td>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]442 </tr>
443
444 </table>
445
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]446 <p><b>Notes:</b></p>
447 <div class="doc_notes">
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]448 <ol>
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]449 <li><a name="sf1">Only the C and C++ languages are needed so there's no
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]450 need to build the other languages for LLVM's purposes.</a> See
451 <a href="#brokengcc">below</a> for specific version info.</li>
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]452 <li><a name="sf2">You only need Subversion if you intend to build from the
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]453 latest LLVM sources. If you're working from a release distribution, you
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]454 don't need Subversion.</a></li>
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]455 <li><a name="sf3">Only needed if you want to run the automated test
456 suite in the <tt>llvm/test</tt> directory.</a></li>
457 <li><a name="sf4">If you want to make changes to the configure scripts,
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]458 you will need GNU autoconf (2.59), and consequently, GNU M4 (version 1.4
Reid Spencer098fce42004-12-09 17:55:37 +0000[diff] [blame]459 or higher). You will also need automake (1.9.2). We only use aclocal
460 from that package.</a></li>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]461 </ol>
Misha Brukman0c4b8b62005-02-09 22:38:47 +0000[diff] [blame]462 </div>
463
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]464 <p>Additionally, your compilation host is expected to have the usual
465 plethora of Unix utilities. Specifically:</p>
466 <ul>
467 <li><b>ar</b> - archive library builder</li>
468 <li><b>bzip2*</b> - bzip2 command for distribution generation</li>
469 <li><b>bunzip2*</b> - bunzip2 command for distribution checking</li>
470 <li><b>chmod</b> - change permissions on a file</li>
John Criswell33e0f062004-12-08 16:55:27 +0000[diff] [blame]471 <li><b>cat</b> - output concatenation utility</li>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]472 <li><b>cp</b> - copy files</li>
473 <li><b>date</b> - print the current date/time </li>
474 <li><b>echo</b> - print to standard output</li>
475 <li><b>egrep</b> - extended regular expression search utility</li>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]476 <li><b>find</b> - find files/dirs in a file system</li>
477 <li><b>grep</b> - regular expression search utility</li>
478 <li><b>gzip*</b> - gzip command for distribution generation</li>
479 <li><b>gunzip*</b> - gunzip command for distribution checking</li>
480 <li><b>install</b> - install directories/files </li>
481 <li><b>mkdir</b> - create a directory</li>
482 <li><b>mv</b> - move (rename) files</li>
483 <li><b>ranlib</b> - symbol table builder for archive libraries</li>
Misha Brukman29d3d462004-11-20 01:27:40 +0000[diff] [blame]484 <li><b>rm</b> - remove (delete) files and directories</li>
Reid Spencer38fcf302004-11-15 21:15:12 +0000[diff] [blame]485 <li><b>sed</b> - stream editor for transforming output</li>
486 <li><b>sh</b> - Bourne shell for make build scripts</li>
487 <li><b>tar</b> - tape archive for distribution generation</li>
488 <li><b>test</b> - test things in file system</li>
489 <li><b>unzip*</b> - unzip command for distribution checking</li>
490 <li><b>zip*</b> - zip command for distribution generation</li>
491 </ul>
Chris Lattnere0050f02004-07-18 22:32:22 +0000[diff] [blame]492</div>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]493
Chris Lattnere0050f02004-07-18 22:32:22 +0000[diff] [blame]494<!-- ======================================================================= -->
495<div class="doc_subsection">
Chris Lattner55514822007-06-19 05:52:36 +0000[diff] [blame]496 <a name="brokengcc">Broken versions of GCC and other tools</a>
Chris Lattnere0050f02004-07-18 22:32:22 +0000[diff] [blame]497</div>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]498
Chris Lattnere0050f02004-07-18 22:32:22 +0000[diff] [blame]499<div class="doc_text">
500
501<p>LLVM is very demanding of the host C++ compiler, and as such tends to expose
502bugs in the compiler. In particular, several versions of GCC crash when trying
Chris Lattner29052c82006-06-16 17:20:33 +0000[diff] [blame]503to compile LLVM. We routinely use GCC 3.3.3, 3.4.0, and Apple 4.0.1
Chris Lattner3d82dcf2007-05-10 06:42:21 +0000[diff] [blame]504successfully with them (however, see important notes below). Other versions
505of GCC will probably work as well. GCC versions listed
Chris Lattnere0050f02004-07-18 22:32:22 +0000[diff] [blame]506here are known to not work. If you are using one of these versions, please try
507to upgrade your GCC to something more recent. If you run into a problem with a
508version of GCC not listed here, please <a href="mailto:llvmdev@cs.uiuc.edu">let
509us know</a>. Please use the "<tt>gcc -v</tt>" command to find out which version
510of GCC you are using.
511</p>
512
513<p><b>GCC versions prior to 3.0</b>: GCC 2.96.x and before had several
514problems in the STL that effectively prevent it from compiling LLVM.
515</p>
516
Chris Lattner419df4e2008-02-13 17:50:24 +0000[diff] [blame]517<p><b>GCC 3.2.2 and 3.2.3</b>: These versions of GCC fails to compile LLVM with
518a bogus template error. This was fixed in later GCCs.</p>
John Criswellfd769452004-11-23 22:06:24 +0000[diff] [blame]519
Chris Lattnere0050f02004-07-18 22:32:22 +0000[diff] [blame]520<p><b>GCC 3.3.2</b>: This version of GCC suffered from a <a
521href="http://gcc.gnu.org/PR13392">serious bug</a> which causes it to crash in
522the "<tt>convert_from_eh_region_ranges_1</tt>" GCC function.</p>
Chris Lattnere254e2f2005-02-12 20:11:13 +0000[diff] [blame]523
Chris Lattner58247622005-02-13 22:20:49 +0000[diff] [blame]524<p><b>Cygwin GCC 3.3.3</b>: The version of GCC 3.3.3 commonly shipped with
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]525 Cygwin does not work. Please <a href="GCCFEBuildInstrs.html#cygwin">upgrade
Chris Lattner58247622005-02-13 22:20:49 +0000[diff] [blame]526 to a newer version</a> if possible.</p>
527<p><b>SuSE GCC 3.3.3</b>: The version of GCC 3.3.3 shipped with SuSE 9.1 (and
528 possibly others) does not compile LLVM correctly (it appears that exception
529 handling is broken in some cases). Please download the FSF 3.3.3 or upgrade
530 to a newer version of GCC.</p>
Bill Wendlinga5d30d52007-07-16 08:52:56 +0000[diff] [blame]531<p><b>GCC 3.4.0 on linux/x86 (32-bit)</b>: GCC miscompiles portions of the
Chris Lattner3d82dcf2007-05-10 06:42:21 +0000[diff] [blame]532 code generator, causing an infinite loop in the llvm-gcc build when built
533 with optimizations enabled (i.e. a release build).</p>
Bill Wendlinga5d30d52007-07-16 08:52:56 +0000[diff] [blame]534<p><b>GCC 3.4.2 on linux/x86 (32-bit)</b>: GCC miscompiles portions of the
Chris Lattner3d82dcf2007-05-10 06:42:21 +0000[diff] [blame]535 code generator at -O3, as with 3.4.0. However gcc 3.4.2 (unlike 3.4.0)
536 correctly compiles LLVM at -O2. A work around is to build release LLVM
537 builds with "make ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O2 ..."</p>
Bill Wendlinga5d30d52007-07-16 08:52:56 +0000[diff] [blame]538<p><b>GCC 3.4.x on X86-64/amd64</b>: GCC <a href="http://llvm.org/PR1056">
Chris Lattner489ad332007-04-01 20:14:46 +0000[diff] [blame]539 miscompiles portions of LLVM</a>.</p>
Chris Lattner059a8df2007-11-01 04:20:16 +0000[diff] [blame]540<p><b>GCC 3.4.4 (CodeSourcery ARM 2005q3-2)</b>: this compiler miscompiles LLVM
541 when building with optimizations enabled. It appears to work with
542 "<tt>make ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O1</tt>" or build a debug
543 build.</p>
Chris Lattner7caf6f62005-05-15 22:26:45 +0000[diff] [blame]544<p><b>IA-64 GCC 4.0.0</b>: The IA-64 version of GCC 4.0.0 is known to
545 miscompile LLVM.</p>
Chris Lattnerc9ede192006-06-16 19:53:39 +0000[diff] [blame]546<p><b>Apple Xcode 2.3</b>: GCC crashes when compiling LLVM at -O3 (which is the
547 default with ENABLE_OPTIMIZED=1. To work around this, build with
548 "ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O2".</p>
Chris Lattneraa64b942006-09-07 17:34:27 +0000[diff] [blame]549<p><b>GCC 4.1.1</b>: GCC fails to build LLVM with template concept check errors
550 compiling some files. At the time of this writing, GCC mainline (4.2)
551 did not share the problem.</p>
Chris Lattner13ce9182007-01-04 07:06:05 +0000[diff] [blame]552<p><b>GCC 4.1.1 on X86-64/amd64</b>: GCC <a href="http://llvm.org/PR1063">
553 miscompiles portions of LLVM</a> when compiling llvm itself into 64-bit
554 code. LLVM will appear to mostly work but will be buggy, e.g. failing
555 portions of its testsuite.</p>
Reid Spencera28d6622007-04-11 21:28:31 +0000[diff] [blame]556<p><b>GCC 4.1.2 on OpenSUSE</b>: Seg faults during libstdc++ build and on x86_64
557platforms compiling md5.c gets a mangled constant.</p>
Daniel Dunbar2a575452008-10-11 18:40:33 +0000[diff] [blame]558<p><b>GCC 4.1.2 (20061115 (prerelease) (Debian 4.1.1-21)) on Debian</b>: Appears
559to miscompile parts of LLVM 2.4. One symptom is ValueSymbolTable complaining
560about symbols remaining in the table on destruction.</p>
561
Reid Spencer6291ddc2006-11-04 00:33:42 +0000[diff] [blame]562<p><b>GNU ld 2.16.X</b>. Some 2.16.X versions of the ld linker will produce very
563long warning messages complaining that some ".gnu.linkonce.t.*" symbol was
564defined in a discarded section. You can safely ignore these messages as they are
565erroneous and the linkage is correct. These messages disappear using ld
5662.17.</p>
Chris Lattner55514822007-06-19 05:52:36 +0000[diff] [blame]567
568<p><b>GNU binutils 2.17</b>: Binutils 2.17 contains <a
569href="http://sourceware.org/bugzilla/show_bug.cgi?id=3111">a bug</a> which
570causes huge link times (minutes instead of seconds) when building LLVM. We
571recommend upgrading to a newer version (2.17.50.0.4 or later).</p>
572
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]573</div>
574
Chris Lattnere0050f02004-07-18 22:32:22 +0000[diff] [blame]575
576
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]577<!-- *********************************************************************** -->
578<div class="doc_section">
579 <a name="starting"><b>Getting Started with LLVM</b></a>
580</div>
581<!-- *********************************************************************** -->
582
Chris Lattnere0050f02004-07-18 22:32:22 +0000[diff] [blame]583<div class="doc_text">
584
585<p>The remainder of this guide is meant to get you up and running with
586LLVM and to give you some basic information about the LLVM environment.</p>
587
588<p>The later sections of this guide describe the <a
589href="#layout">general layout</a> of the the LLVM source tree, a <a
590href="#tutorial">simple example</a> using the LLVM tool chain, and <a
591href="#links">links</a> to find more information about LLVM or to get
592help via e-mail.</p>
593</div>
594
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]595<!-- ======================================================================= -->
596<div class="doc_subsection">
597 <a name="terminology">Terminology and Notation</a>
598</div>
599
600<div class="doc_text">
601
602<p>Throughout this manual, the following names are used to denote paths
603specific to the local system and working environment. <i>These are not
604environment variables you need to set but just strings used in the rest
605of this document below</i>. In any of the examples below, simply replace
606each of these names with the appropriate pathname on your local system.
607All these paths are absolute:</p>
608
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]609<dl>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]610 <dt>SRC_ROOT
611 <dd>
612 This is the top level directory of the LLVM source tree.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]613 <br><br>
John Criswellf531f312003-10-27 18:18:16 +0000[diff] [blame]614
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]615 <dt>OBJ_ROOT
616 <dd>
617 This is the top level directory of the LLVM object tree (i.e. the
618 tree where object files and compiled programs will be placed. It
619 can be the same as SRC_ROOT).
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]620 <br><br>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]621
622 <dt>LLVMGCCDIR
623 <dd>
Reid Spencer6bfa7a42004-12-26 05:47:26 +0000[diff] [blame]624 This is where the LLVM GCC Front End is installed.
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]625 <p>
626 For the pre-built GCC front end binaries, the LLVMGCCDIR is
Tanya Lattnerda2d1e22006-11-20 06:04:46 +0000[diff] [blame]627 <tt>llvm-gcc/<i>platform</i>/llvm-gcc</tt>.
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]628</dl>
629
630</div>
631
632<!-- ======================================================================= -->
633<div class="doc_subsection">
634 <a name="environment">Setting Up Your Environment</a>
635</div>
636
637<div class="doc_text">
638
639<p>
Misha Brukmancd673252005-02-03 18:28:08 +0000[diff] [blame]640In order to compile and use LLVM, you may need to set some environment
641variables.
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]642
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]643<dl>
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]644 <dt><tt>LLVM_LIB_SEARCH_PATH</tt>=<tt>/path/to/your/bitcode/libs</tt></dt>
Misha Brukmancd673252005-02-03 18:28:08 +0000[diff] [blame]645 <dd>[Optional] This environment variable helps LLVM linking tools find the
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]646 locations of your bitcode libraries. It is provided only as a
Misha Brukmancd673252005-02-03 18:28:08 +0000[diff] [blame]647 convenience since you can specify the paths using the -L options of the
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]648 tools and the C/C++ front-end will automatically use the bitcode files
John Criswelle1a81202005-05-18 19:43:33 +0000[diff] [blame]649 installed in its
Misha Brukmancd673252005-02-03 18:28:08 +0000[diff] [blame]650 <tt>lib</tt> directory.</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]651</dl>
652
653</div>
654
655<!-- ======================================================================= -->
656<div class="doc_subsection">
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]657 <a name="unpack">Unpacking the LLVM Archives</a>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]658</div>
659
660<div class="doc_text">
661
662<p>
663If you have the LLVM distribution, you will need to unpack it before you
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]664can begin to compile it. LLVM is distributed as a set of two files: the LLVM
John Criswelldfe6a862004-12-10 15:51:16 +0000[diff] [blame]665suite and the LLVM GCC front end compiled for your platform. There is an
666additional test suite that is optional. Each file is a TAR archive that is
667compressed with the gzip program.
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]668</p>
669
Misha Brukmand4528ea2005-02-02 18:01:57 +0000[diff] [blame]670<p>The files are as follows, with <em>x.y</em> marking the version number:
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]671<dl>
Misha Brukmand4528ea2005-02-02 18:01:57 +0000[diff] [blame]672 <dt><tt>llvm-x.y.tar.gz</tt></dt>
673 <dd>Source release for the LLVM libraries and tools.<br/></dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]674
Misha Brukmand4528ea2005-02-02 18:01:57 +0000[diff] [blame]675 <dt><tt>llvm-test-x.y.tar.gz</tt></dt>
Chris Lattnerac648f52005-02-09 21:15:51 +0000[diff] [blame]676 <dd>Source release for the LLVM test suite.</dd>
Misha Brukmanc3184442004-11-23 19:26:24 +0000[diff] [blame]677
Chris Lattner499abb52006-04-20 05:08:23 +0000[diff] [blame]678 <dt><tt>llvm-gcc4-x.y.source.tar.gz</tt></dt>
679 <dd>Source release of the llvm-gcc4 front end. See README.LLVM in the root
680 directory for build instructions.<br/></dd>
681
Tanya Lattnerda2d1e22006-11-20 06:04:46 +0000[diff] [blame]682 <dt><tt>llvm-gcc4-x.y-platform.tar.gz</tt></dt>
683 <dd>Binary release of the llvm-gcc4 front end for a specific platform.<br/></dd>
Chris Lattner499abb52006-04-20 05:08:23 +0000[diff] [blame]684
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]685</dl>
686
687</div>
688
689<!-- ======================================================================= -->
690<div class="doc_subsection">
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]691 <a name="checkout">Checkout LLVM from Subversion</a>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]692</div>
693
694<div class="doc_text">
695
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]696<p>If you have access to our Subversion repository, you can get a fresh copy of
697the entire source code. All you need to do is check it out from Subvresion as
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]698follows:</p>
699
700<ul>
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]701 <li><tt>cd <i>where-you-want-llvm-to-live</i></tt></li>
Anton Korobeynikov4c04a93332007-06-29 20:56:49 +0000[diff] [blame]702 <li>Read-Only: <tt>svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm</tt></li>
703 <li>Read-Write:<tt>svn co https://user@llvm.org/svn/llvm-project/llvm/trunk
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]704 llvm</tt></li>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]705</ul>
706
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]707
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]708<p>This will create an '<tt>llvm</tt>' directory in the current
709directory and fully populate it with the LLVM source code, Makefiles,
710test directories, and local copies of documentation files.</p>
711
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]712<p>If you want to get a specific release (as opposed to the most recent
Anton Korobeynikoveaa836b2007-06-29 23:13:42 +0000[diff] [blame]713revision), you can checkout it from the '<tt>tags</tt>' directory (instead of
Anton Korobeynikov09ca62d2007-06-30 00:00:57 +0000[diff] [blame]714'<tt>trunk</tt>'). The following releases are located in the following
715 subdirectories of the '<tt>tags</tt>' directory:</p>
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]716
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]717<ul>
Tanya Lattner610e89d2008-06-09 06:02:09 +0000[diff] [blame]718<li>Release 2.3: <b>RELEASE_23</b></li>
Tanya Lattner779593c2008-02-12 02:42:55 +0000[diff] [blame]719<li>Release 2.2: <b>RELEASE_22</b></li>
Tanya Lattner586eb8e2007-09-28 22:50:54 +0000[diff] [blame]720<li>Release 2.1: <b>RELEASE_21</b></li>
Tanya Lattnere94a09e2007-05-22 06:06:22 +0000[diff] [blame]721<li>Release 2.0: <b>RELEASE_20</b></li>
Tanya Lattner84252ca2006-11-20 06:07:10 +0000[diff] [blame]722<li>Release 1.9: <b>RELEASE_19</b></li>
Tanya Lattnerda2d1e22006-11-20 06:04:46 +0000[diff] [blame]723<li>Release 1.8: <b>RELEASE_18</b></li>
Tanya Lattnerfb762912006-04-20 04:35:34 +0000[diff] [blame]724<li>Release 1.7: <b>RELEASE_17</b></li>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]725<li>Release 1.6: <b>RELEASE_16</b></li>
John Criswell05990f32005-05-09 16:49:59 +0000[diff] [blame]726<li>Release 1.5: <b>RELEASE_15</b></li>
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]727<li>Release 1.4: <b>RELEASE_14</b></li>
John Criswell1e87b972004-08-16 14:51:33 +0000[diff] [blame]728<li>Release 1.3: <b>RELEASE_13</b></li>
Misha Brukmanc1aac032004-05-12 19:25:59 +0000[diff] [blame]729<li>Release 1.2: <b>RELEASE_12</b></li>
730<li>Release 1.1: <b>RELEASE_11</b></li>
731<li>Release 1.0: <b>RELEASE_1</b></li>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]732</ul>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]733
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]734<p>If you would like to get the LLVM test suite (a separate package as of 1.4),
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]735you get it from the Subversion repository:</p>
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]736
737<div class="doc_code">
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]738<pre>
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]739% cd llvm/projects
740% svn co http://llvm.org/svn/llvm-project/test-suite/trunk llvm-test
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]741</pre>
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]742</div>
743
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]744<p>By placing it in the <tt>llvm/projects</tt>, it will be automatically
John Criswell33e0f062004-12-08 16:55:27 +0000[diff] [blame]745configured by the LLVM configure script as well as automatically updated when
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]746you run <tt>svn update</tt>.</p>
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]747
Chris Lattner40872ad2007-03-06 06:27:34 +0000[diff] [blame]748<p>If you would like to get the GCC front end source code, you can also get it
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]749and build it yourself. Please follow <a href="GCCFEBuildInstrs.html">these
Chris Lattner40872ad2007-03-06 06:27:34 +0000[diff] [blame]750instructions</a> to successfully get and build the LLVM GCC front-end.</p>
Chris Lattner3337c822004-06-28 17:14:01 +0000[diff] [blame]751
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]752</div>
753
754<!-- ======================================================================= -->
755<div class="doc_subsection">
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]756 <a name="installcf">Install the GCC Front End</a>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]757</div>
758
759<div class="doc_text">
760
Chris Lattner24b71352007-02-14 07:33:00 +0000[diff] [blame]761<p>Before configuring and compiling the LLVM suite, you can optionally extract the
762LLVM GCC front end from the binary distribution. It is used for running the
763llvm-test testsuite and for compiling C/C++ programs. Note that you can optionally
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]764<a href="GCCFEBuildInstrs.html">build llvm-gcc yourself</a> after building the
Chris Lattner24b71352007-02-14 07:33:00 +0000[diff] [blame]765main LLVM repository.</p>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]766
767<p>To install the GCC front end, do the following:</p>
768
769<ol>
770 <li><tt>cd <i>where-you-want-the-front-end-to-live</i></tt></li>
Tanya Lattnerda2d1e22006-11-20 06:04:46 +0000[diff] [blame]771 <li><tt>gunzip --stdout llvmgcc-<i>version</i>.<i>platform</i>.tar.gz | tar -xvf
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]772 -</tt></li>
773</ol>
774
Chris Lattner24b71352007-02-14 07:33:00 +0000[diff] [blame]775<p>Once the binary is uncompressed, you should add a symlink for llvm-gcc and
776llvm-g++ to some directory in your path. When you configure LLVM, it will
777automatically detect llvm-gcc's presence (if it is in your path) enabling its
778use in llvm-test. Note that you can always build or install llvm-gcc at any
779pointer after building the main LLVM repository: just reconfigure llvm and
780llvm-test will pick it up.
781</p>
782
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]783<p>The binary versions of the GCC front end may not suit all of your needs. For
784example, the binary distribution may include an old version of a system header
785file, not "fix" a header file that needs to be fixed for GCC, or it may be
786linked with libraries not available on your system.</p>
787
788<p>In cases like these, you may want to try <a
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]789href="GCCFEBuildInstrs.html">building the GCC front end from source.</a> This is
Chris Lattnercba64662007-02-14 07:34:22 +0000[diff] [blame]790much easier now than it was in the past.</p>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]791
792</div>
793
794<!-- ======================================================================= -->
795<div class="doc_subsection">
796 <a name="config">Local LLVM Configuration</a>
797</div>
798
799<div class="doc_text">
800
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]801 <p>Once checked out from the Subversion repository, the LLVM suite source
802 code must be
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]803configured via the <tt>configure</tt> script. This script sets variables in the
804various <tt>*.in</tt> files, most notably <tt>llvm/Makefile.config</tt> and
805<tt>llvm/include/Config/config.h</tt>. It also populates <i>OBJ_ROOT</i> with
806the Makefiles needed to begin building LLVM.</p>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]807
808<p>The following environment variables are used by the <tt>configure</tt>
809script to configure the build system:</p>
810
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]811<table summary="LLVM configure script environment variables">
Reid Spencerc3c4c4f2004-11-01 08:19:36 +0000[diff] [blame]812 <tr><th>Variable</th><th>Purpose</th></tr>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]813 <tr>
814 <td>CC</td>
815 <td>Tells <tt>configure</tt> which C compiler to use. By default,
816 <tt>configure</tt> will look for the first GCC C compiler in
817 <tt>PATH</tt>. Use this variable to override
818 <tt>configure</tt>'s default behavior.</td>
819 </tr>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]820 <tr>
821 <td>CXX</td>
822 <td>Tells <tt>configure</tt> which C++ compiler to use. By default,
823 <tt>configure</tt> will look for the first GCC C++ compiler in
824 <tt>PATH</tt>. Use this variable to override
825 <tt>configure</tt>'s default behavior.</td>
826 </tr>
827</table>
828
829<p>The following options can be used to set or enable LLVM specific options:</p>
830
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]831<dl>
Reid Spencer6bfa7a42004-12-26 05:47:26 +0000[diff] [blame]832 <dt><i>--with-llvmgccdir</i></dt>
833 <dd>Path to the LLVM C/C++ FrontEnd to be used with this LLVM configuration.
834 The value of this option should specify the full pathname of the C/C++ Front
835 End to be used. If this option is not provided, the PATH will be searched for
836 a program named <i>llvm-gcc</i> and the C/C++ FrontEnd install directory will
837 be inferred from the path found. If the option is not given, and no llvm-gcc
838 can be found in the path then a warning will be produced by
839 <tt>configure</tt> indicating this situation. LLVM may still be built with
840 the <tt>tools-only</tt> target but attempting to build the runtime libraries
841 will fail as these libraries require llvm-gcc and llvm-g++. See
842 <a href="#installcf">Install the GCC Front End</a> for details on installing
843 the C/C++ Front End. See
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]844 <a href="GCCFEBuildInstrs.html">Bootstrapping the LLVM C/C++ Front-End</a>
Reid Spencer6bfa7a42004-12-26 05:47:26 +0000[diff] [blame]845 for details on building the C/C++ Front End.</dd>
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]846 <dt><i>--with-tclinclude</i></dt>
John Criswelle1a81202005-05-18 19:43:33 +0000[diff] [blame]847 <dd>Path to the tcl include directory under which <tt>tclsh</tt> can be
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]848 found. Use this if you have multiple tcl installations on your machine and you
849 want to use a specific one (8.x) for LLVM. LLVM only uses tcl for running the
850 dejagnu based test suite in <tt>llvm/test</tt>. If you don't specify this
John Criswelle1a81202005-05-18 19:43:33 +0000[diff] [blame]851 option, the LLVM configure script will search for the tcl 8.4 and 8.3
852 releases.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]853 <br><br>
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]854 </dd>
855 <dt><i>--enable-optimized</i></dt>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]856 <dd>
857 Enables optimized compilation by default (debugging symbols are removed
858 and GCC optimization flags are enabled). The default is to use an
859 unoptimized build (also known as a debug build).
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]860 <br><br>
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]861 </dd>
Reid Spencer294adbb2005-12-21 03:46:45 +0000[diff] [blame]862 <dt><i>--enable-debug-runtime</i></dt>
863 <dd>
864 Enables debug symbols in the runtime libraries. The default is to strip
865 debug symbols from the runtime libraries.
866 </dd>
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]867 <dt><i>--enable-jit</i></dt>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]868 <dd>
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]869 Compile the Just In Time (JIT) compiler functionality. This is not
870 available
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]871 on all platforms. The default is dependent on platform, so it is best
872 to explicitly enable it if you want it.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]873 <br><br>
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]874 </dd>
Reid Spencer1e195bd2005-04-22 17:58:03 +0000[diff] [blame]875 <dt><i>--enable-targets=</i><tt>target-option</tt></dt>
876 <dd>Controls which targets will be built and linked into llc. The default
877 value for <tt>target_options</tt> is "all" which builds and links all
878 available targets. The value "host-only" can be specified to build only a
879 native compiler (no cross-compiler targets available). The "native" target is
880 selected as the target of the build host. You can also specify a comma
881 separated list of target names that you want available in llc. The target
John Criswelle1a81202005-05-18 19:43:33 +0000[diff] [blame]882 names use all lower case. The current set of targets is: <br/>
Reid Spencer1e195bd2005-04-22 17:58:03 +0000[diff] [blame]883 <tt>alpha, ia64, powerpc, skeleton, sparc, x86</tt>.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]884 <br><br></dd>
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]885 <dt><i>--enable-doxygen</i></dt>
886 <dd>Look for the doxygen program and enable construction of doxygen based
887 documentation from the source code. This is disabled by default because
888 generating the documentation can take a long time and producess 100s of
889 megabytes of output.</dd>
Anton Korobeynikovc7f9f3d2007-01-23 12:35:46 +0000[diff] [blame]890 <dt><i>--with-udis86</i></dt>
891 <dd>LLVM can use external disassembler library for various purposes (now it's
892 used only for examining code produced by JIT). This option will enable usage
893 of <a href="http://udis86.sourceforge.net/">udis86</a> x86 (both 32 and 64
894 bits) disassembler library.</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]895</dl>
896
897<p>To configure LLVM, follow these steps:</p>
898
899<ol>
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]900 <li><p>Change directory into the object root directory:</p>
John Criswellf531f312003-10-27 18:18:16 +0000[diff] [blame]901
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]902 <div class="doc_code"><pre>% cd <i>OBJ_ROOT</i></pre></div></li>
903
904 <li><p>Run the <tt>configure</tt> script located in the LLVM source
905 tree:</p>
906
907 <div class="doc_code">
908 <pre>% <i>SRC_ROOT</i>/configure --prefix=/install/path [other options]</pre>
909 </div></li>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]910</ol>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]911
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]912</div>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]913
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]914<!-- ======================================================================= -->
915<div class="doc_subsection">
916 <a name="compile">Compiling the LLVM Suite Source Code</a>
917</div>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]918
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]919<div class="doc_text">
John Criswell71139f22003-07-08 20:35:59 +0000[diff] [blame]920
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]921<p>Once you have configured LLVM, you can build it. There are three types of
922builds:</p>
John Criswell71139f22003-07-08 20:35:59 +0000[diff] [blame]923
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]924<dl>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]925 <dt>Debug Builds
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]926 <dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]927 These builds are the default when one types <tt>gmake</tt> (unless the
928 <tt>--enable-optimized</tt> option was used during configuration). The
929 build system will compile the tools and libraries with debugging
930 information.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]931 <br><br>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]932
933 <dt>Release (Optimized) Builds
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]934 <dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]935 These builds are enabled with the <tt>--enable-optimized</tt> option to
936 <tt>configure</tt> or by specifying <tt>ENABLE_OPTIMIZED=1</tt> on the
937 <tt>gmake</tt> command line. For these builds, the build system will
938 compile the tools and libraries with GCC optimizations enabled and strip
939 debugging information from the libraries and executables it generates.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]940 <br><br>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]941
942 <dt>Profile Builds
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]943 <dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]944 These builds are for use with profiling. They compile profiling
945 information into the code for use with programs like <tt>gprof</tt>.
946 Profile builds must be started by specifying <tt>ENABLE_PROFILING=1</tt>
947 on the <tt>gmake</tt> command line.
948</dl>
John Criswell3ef61af2003-06-30 21:59:07 +0000[diff] [blame]949
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]950<p>Once you have LLVM configured, you can build it by entering the
951<i>OBJ_ROOT</i> directory and issuing the following command:</p>
John Criswell38cc2b52003-10-10 14:26:14 +0000[diff] [blame]952
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]953<div class="doc_code"><pre>% gmake</pre></div>
John Criswell38cc2b52003-10-10 14:26:14 +0000[diff] [blame]954
Chris Lattnere0050f02004-07-18 22:32:22 +0000[diff] [blame]955<p>If the build fails, please <a href="#brokengcc">check here</a> to see if you
John Criswell6ab273c2004-12-08 17:53:54 +0000[diff] [blame]956are using a version of GCC that is known not to compile LLVM.</p>
Chris Lattnere0050f02004-07-18 22:32:22 +0000[diff] [blame]957
958<p>
959If you have multiple processors in your machine, you may wish to use some of
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]960the parallel build options provided by GNU Make. For example, you could use the
961command:</p>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]962
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]963<div class="doc_code"><pre>% gmake -j2</pre></div>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]964
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]965<p>There are several special targets which are useful when working with the LLVM
966source code:</p>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]967
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]968<dl>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]969 <dt><tt>gmake clean</tt>
970 <dd>
971 Removes all files generated by the build. This includes object files,
972 generated C/C++ files, libraries, and executables.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]973 <br><br>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]974
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]975 <dt><tt>gmake dist-clean</tt>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]976 <dd>
Misha Brukman5d413912004-08-21 23:40:49 +0000[diff] [blame]977 Removes everything that <tt>gmake clean</tt> does, but also removes files
978 generated by <tt>configure</tt>. It attempts to return the source tree to the
979 original state in which it was shipped.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]980 <br><br>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]981
Misha Brukman62a2c1f2004-08-23 20:25:33 +0000[diff] [blame]982 <dt><tt>gmake install</tt>
983 <dd>
John Criswell6ab273c2004-12-08 17:53:54 +0000[diff] [blame]984 Installs LLVM header files, libraries, tools, and documentation in a
985 hierarchy
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]986 under $PREFIX, specified with <tt>./configure --prefix=[dir]</tt>, which
987 defaults to <tt>/usr/local</tt>.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]988 <br><br>
989
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]990 <dt><tt>gmake -C runtime install-bytecode</tt>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]991 <dd>
Reid Spencer45dc1392004-11-11 07:30:27 +0000[diff] [blame]992 Assuming you built LLVM into $OBJDIR, when this command is run, it will
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]993 install bitcode libraries into the GCC front end's bitcode library
994 directory. If you need to update your bitcode libraries,
Misha Brukman5d413912004-08-21 23:40:49 +0000[diff] [blame]995 this is the target to use once you've built them.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]996 <br><br>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]997</dl>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]998
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]999<p>Please see the <a href="MakefileGuide.html">Makefile Guide</a> for further
1000details on these <tt>make</tt> targets and descriptions of other targets
1001available.</p>
1002
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1003<p>It is also possible to override default values from <tt>configure</tt> by
1004declaring variables on the command line. The following are some examples:</p>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1005
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1006<dl>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1007 <dt><tt>gmake ENABLE_OPTIMIZED=1</tt>
1008 <dd>
1009 Perform a Release (Optimized) build.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1010 <br><br>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1011
Reid Spencer3dc3ea72006-04-09 23:45:38 +0000[diff] [blame]1012 <dt><tt>gmake ENABLE_OPTIMIZED=1 DISABLE_ASSERTIONS=1</tt>
Chris Lattner0f546dd2006-03-21 01:10:57 +0000[diff] [blame]1013 <dd>
Reid Spencer3dc3ea72006-04-09 23:45:38 +0000[diff] [blame]1014 Perform a Release (Optimized) build without assertions enabled.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1015 <br><br>
Chris Lattner0f546dd2006-03-21 01:10:57 +0000[diff] [blame]1016
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1017 <dt><tt>gmake ENABLE_PROFILING=1</tt>
1018 <dd>
1019 Perform a Profiling build.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1020 <br><br>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1021
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1022 <dt><tt>gmake VERBOSE=1</tt>
1023 <dd>
1024 Print what <tt>gmake</tt> is doing on standard output.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1025 <br><br>
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]1026
1027 <dt><tt>gmake TOOL_VERBOSE=1</tt></dt>
1028 <dd>Ask each tool invoked by the makefiles to print out what it is doing on
John Criswell6ab273c2004-12-08 17:53:54 +0000[diff] [blame]1029 the standard output. This also implies <tt>VERBOSE=1</tt>.
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1030 <br><br></dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1031</dl>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1032
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1033<p>Every directory in the LLVM object tree includes a <tt>Makefile</tt> to build
1034it and any subdirectories that it contains. Entering any directory inside the
1035LLVM object tree and typing <tt>gmake</tt> should rebuild anything in or below
1036that directory that is out of date.</p>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1037
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1038</div>
John Criswell38cc2b52003-10-10 14:26:14 +0000[diff] [blame]1039
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1040<!-- ======================================================================= -->
1041<div class="doc_subsection">
Reid Spencer734b74f2006-07-27 06:41:31 +0000[diff] [blame]1042 <a name="cross-compile">Cross-Compiling LLVM</a>
Reid Spencerd966b242006-07-27 05:43:30 +0000[diff] [blame]1043</div>
1044
1045<div class="doc_text">
Reid Spencer734b74f2006-07-27 06:41:31 +0000[diff] [blame]1046 <p>It is possible to cross-compile LLVM. That is, you can create LLVM
1047 executables and libraries for a platform different than the one one which you
1048 are compiling. To do this, a few additional steps are
1049 required. <sup><a href="#ccn_1">1</a></sup> To cross-compile LLVM, use
Reid Spencerd966b242006-07-27 05:43:30 +0000[diff] [blame]1050 these instructions:</p>
1051 <ol>
Reid Spencer734b74f2006-07-27 06:41:31 +0000[diff] [blame]1052 <li>Configure and build LLVM as a native compiler. You will need
Reid Spencerd966b242006-07-27 05:43:30 +0000[diff] [blame]1053 just <tt>TableGen</tt> from that build.
1054 <ul>
1055 <li>If you have <tt>$LLVM_OBJ_ROOT=$LLVM_SRC_ROOT</tt> just execute
1056 <tt>make -C utils/TableGen</tt> after configuring.</li>
1057 <li>Otherwise you will need to monitor building process and terminate
1058 it just after <tt>TableGen</tt> was built.</li>
1059 </ul>
1060 </li>
1061 <li>Copy the TableGen binary to somewhere safe (out of your build tree).
1062 </li>
Reid Spencer734b74f2006-07-27 06:41:31 +0000[diff] [blame]1063 <li>Configure LLVM to build with a cross-compiler. To do this, supply the
Reid Spencerd966b242006-07-27 05:43:30 +0000[diff] [blame]1064 configure script with <tt>--build</tt> and <tt>--host</tt> options that
Reid Spencer734b74f2006-07-27 06:41:31 +0000[diff] [blame]1065 are different. The values of these options must be legal target triples
1066 that your GCC compiler supports.</li>
Reid Spencerd966b242006-07-27 05:43:30 +0000[diff] [blame]1067 <li>Put the saved <tt>TableGen</tt> executable into the
1068 into <tt>$LLVM_OBJ_ROOT/{BUILD_TYPE}/bin</tt> directory (e.g. into
1069 <tt>.../Release/bin</tt> for a Release build).</li>
1070 <li>Build LLVM as usual.</li>
1071 </ol>
Reid Spencer734b74f2006-07-27 06:41:31 +0000[diff] [blame]1072 <p>The result of such a build will produce executables that are not executable
1073 on your build host (--build option) but can be executed on your compile host
1074 (--host option).</p>
Reid Spencerd966b242006-07-27 05:43:30 +0000[diff] [blame]1075 <p><b>Notes:</b></p>
1076 <div class="doc_notes">
1077 <ol>
1078 <li><a name="ccn_1">Cross-compiling</a> was tested only with Linux as
1079 build platform and Windows as host using mingw32 cross-compiler. Other
1080 combinations have not been tested.</li>
1081 </ol>
1082 </div>
1083</div>
1084
1085<!-- ======================================================================= -->
1086<div class="doc_subsection">
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1087 <a name="objfiles">The Location of LLVM Object Files</a>
1088</div>
John Criswell38cc2b52003-10-10 14:26:14 +0000[diff] [blame]1089
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1090<div class="doc_text">
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1091
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1092<p>The LLVM build system is capable of sharing a single LLVM source tree among
1093several LLVM builds. Hence, it is possible to build LLVM for several different
1094platforms or configurations using the same source tree.</p>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1095
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1096<p>This is accomplished in the typical autoconf manner:</p>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1097
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1098<ul>
1099 <li><p>Change directory to where the LLVM object files should live:</p>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1100
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1101 <div class="doc_code"><pre>% cd <i>OBJ_ROOT</i></pre></div></li>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1102
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1103 <li><p>Run the <tt>configure</tt> script found in the LLVM source
1104 directory:</p>
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1105
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1106 <div class="doc_code"><pre>% <i>SRC_ROOT</i>/configure</pre></div></li>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1107</ul>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1108
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1109<p>The LLVM build will place files underneath <i>OBJ_ROOT</i> in directories
1110named after the build type:</p>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1111
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1112<dl>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1113 <dt>Debug Builds
1114 <dd>
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1115 <dl>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1116 <dt>Tools
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]1117 <dd><tt><i>OBJ_ROOT</i>/Debug/bin</tt>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1118 <dt>Libraries
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]1119 <dd><tt><i>OBJ_ROOT</i>/Debug/lib</tt>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1120 </dl>
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1121 <br><br>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1122
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1123 <dt>Release Builds
1124 <dd>
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1125 <dl>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1126 <dt>Tools
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]1127 <dd><tt><i>OBJ_ROOT</i>/Release/bin</tt>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1128 <dt>Libraries
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]1129 <dd><tt><i>OBJ_ROOT</i>/Release/lib</tt>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1130 </dl>
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1131 <br><br>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1132
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1133 <dt>Profile Builds
1134 <dd>
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1135 <dl>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1136 <dt>Tools
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]1137 <dd><tt><i>OBJ_ROOT</i>/Profile/bin</tt>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1138 <dt>Libraries
Reid Spencerdfcf7902004-12-08 16:51:31 +0000[diff] [blame]1139 <dd><tt><i>OBJ_ROOT</i>/Profile/lib</tt>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1140 </dl>
1141</dl>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1142
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1143</div>
Chris Lattner1c1ef112002-07-24 19:51:14 +0000[diff] [blame]1144
Chris Lattner998c0672004-03-25 20:38:40 +0000[diff] [blame]1145<!-- ======================================================================= -->
1146<div class="doc_subsection">
1147 <a name="optionalconfig">Optional Configuration Items</a>
1148</div>
1149
1150<div class="doc_text">
1151
1152<p>
Misha Brukman20b8a6562005-02-03 22:25:23 +0000[diff] [blame]1153If you're running on a Linux system that supports the "<a
Bill Wendlingaf5b63f2007-07-16 08:46:40 +0000[diff] [blame]1154href="http://www.tat.physik.uni-tuebingen.de/~rguenth/linux/binfmt_misc.html">binfmt_misc</a>"
Chris Lattner998c0672004-03-25 20:38:40 +0000[diff] [blame]1155module, and you have root access on the system, you can set your system up to
Bill Wendlingaf5b63f2007-07-16 08:46:40 +0000[diff] [blame]1156execute LLVM bitcode files directly. To do this, use commands like this (the
Chris Lattner998c0672004-03-25 20:38:40 +0000[diff] [blame]1157first command may not be required if you are already using the module):</p>
1158
Misha Brukman20b8a6562005-02-03 22:25:23 +0000[diff] [blame]1159<div class="doc_code">
Chris Lattner998c0672004-03-25 20:38:40 +0000[diff] [blame]1160<pre>
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1161$ mount -t binfmt_misc none /proc/sys/fs/binfmt_misc
1162$ echo ':llvm:M::llvm::/path/to/lli:' &gt; /proc/sys/fs/binfmt_misc/register
1163$ chmod u+x hello.bc (if needed)
1164$ ./hello.bc
Chris Lattner998c0672004-03-25 20:38:40 +0000[diff] [blame]1165</pre>
Misha Brukman20b8a6562005-02-03 22:25:23 +0000[diff] [blame]1166</div>
Chris Lattner998c0672004-03-25 20:38:40 +0000[diff] [blame]1167
1168<p>
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1169This allows you to execute LLVM bitcode files directly. Thanks to Jack
Chris Lattner998c0672004-03-25 20:38:40 +0000[diff] [blame]1170Cummings for pointing this out!
1171</p>
1172
1173</div>
1174
1175
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1176<!-- *********************************************************************** -->
1177<div class="doc_section">
1178 <a name="layout"><b>Program Layout</b></a>
1179</div>
1180<!-- *********************************************************************** -->
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1181
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1182<div class="doc_text">
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1183
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1184<p>One useful source of information about the LLVM source base is the LLVM <a
John Criswell64f13ab2004-03-12 20:31:37 +0000[diff] [blame]1185href="http://www.doxygen.org">doxygen</a> documentation available at <tt><a
Reid Spencerca058542006-03-14 05:39:39 +0000[diff] [blame]1186href="http://llvm.org/doxygen/">http://llvm.org/doxygen/</a></tt>.
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1187The following is a brief introduction to code layout:</p>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1188
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1189</div>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1190
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1191<!-- ======================================================================= -->
Reid Spencer5be4f042004-12-08 16:18:26 +0000[diff] [blame]1192<div class="doc_subsection"><a name="examples"><tt>llvm/examples</tt></a></div>
1193<div class="doc_text">
1194 <p>This directory contains some simple examples of how to use the LLVM IR and
1195 JIT.</p>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1196</div>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1197
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1198<!-- ======================================================================= -->
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1199<div class="doc_subsection"><a name="include"><tt>llvm/include</tt></a></div>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1200<div class="doc_text">
1201
1202<p>This directory contains public header files exported from the LLVM
1203library. The three main subdirectories of this directory are:</p>
1204
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1205<dl>
1206 <dt><tt><b>llvm/include/llvm</b></tt></dt>
1207 <dd>This directory contains all of the LLVM specific header files. This
1208 directory also has subdirectories for different portions of LLVM:
1209 <tt>Analysis</tt>, <tt>CodeGen</tt>, <tt>Target</tt>, <tt>Transforms</tt>,
1210 etc...</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1211
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1212 <dt><tt><b>llvm/include/llvm/Support</b></tt></dt>
1213 <dd>This directory contains generic support libraries that are provided with
1214 LLVM but not necessarily specific to LLVM. For example, some C++ STL utilities
1215 and a Command Line option processing library store their header files here.
1216 </dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1217
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1218 <dt><tt><b>llvm/include/llvm/Config</b></tt></dt>
1219 <dd>This directory contains header files configured by the <tt>configure</tt>
1220 script. They wrap "standard" UNIX and C header files. Source code can
1221 include these header files which automatically take care of the conditional
1222 #includes that the <tt>configure</tt> script generates.</dd>
1223</dl>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1224</div>
1225
1226<!-- ======================================================================= -->
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1227<div class="doc_subsection"><a name="lib"><tt>llvm/lib</tt></a></div>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1228<div class="doc_text">
1229
1230<p>This directory contains most of the source files of the LLVM system. In LLVM,
1231almost all code exists in libraries, making it very easy to share code among the
1232different <a href="#tools">tools</a>.</p>
1233
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1234<dl>
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1235 <dt><tt><b>llvm/lib/VMCore/</b></tt></dt>
1236 <dd> This directory holds the core LLVM source files that implement core
1237 classes like Instruction and BasicBlock.</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1238
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1239 <dt><tt><b>llvm/lib/AsmParser/</b></tt></dt>
1240 <dd>This directory holds the source code for the LLVM assembly language parser
1241 library.</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1242
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1243 <dt><tt><b>llvm/lib/BitCode/</b></tt></dt>
1244 <dd>This directory holds code for reading and write LLVM bitcode.</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1245
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1246 <dt><tt><b>llvm/lib/Analysis/</b></tt><dd>This directory contains a variety of
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1247 different program analyses, such as Dominator Information, Call Graphs,
1248 Induction Variables, Interval Identification, Natural Loop Identification,
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1249 etc.</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1250
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1251 <dt><tt><b>llvm/lib/Transforms/</b></tt></dt>
1252 <dd> This directory contains the source code for the LLVM to LLVM program
1253 transformations, such as Aggressive Dead Code Elimination, Sparse Conditional
1254 Constant Propagation, Inlining, Loop Invariant Code Motion, Dead Global
1255 Elimination, and many others.</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1256
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1257 <dt><tt><b>llvm/lib/Target/</b></tt></dt>
1258 <dd> This directory contains files that describe various target architectures
Chris Lattner7991e852006-04-20 17:42:23 +0000[diff] [blame]1259 for code generation. For example, the <tt>llvm/lib/Target/X86</tt>
1260 directory holds the X86 machine description while
John Criswelle1a81202005-05-18 19:43:33 +0000[diff] [blame]1261 <tt>llvm/lib/Target/CBackend</tt> implements the LLVM-to-C converter.</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1262
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1263 <dt><tt><b>llvm/lib/CodeGen/</b></tt></dt>
1264 <dd> This directory contains the major parts of the code generator: Instruction
1265 Selector, Instruction Scheduling, and Register Allocation.</dd>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1266
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1267 <dt><tt><b>llvm/lib/Debugger/</b></tt></dt>
1268 <dd> This directory contains the source level debugger library that makes
1269 it possible to instrument LLVM programs so that a debugger could identify
1270 source code locations at which the program is executing.</dd>
1271
1272 <dt><tt><b>llvm/lib/ExecutionEngine/</b></tt></dt>
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1273 <dd> This directory contains libraries for executing LLVM bitcode directly
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1274 at runtime in both interpreted and JIT compiled fashions.</dd>
1275
1276 <dt><tt><b>llvm/lib/Support/</b></tt></dt>
1277 <dd> This directory contains the source code that corresponds to the header
1278 files located in <tt>llvm/include/Support/</tt>.</dd>
1279
1280 <dt><tt><b>llvm/lib/System/</b></tt></dt>
1281 <dd>This directory contains the operating system abstraction layer that
1282 shields LLVM from platform-specific coding.</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1283</dl>
John Criswell3ef61af2003-06-30 21:59:07 +0000[diff] [blame]1284
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1285</div>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1286
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1287<!-- ======================================================================= -->
Reid Spencer5be4f042004-12-08 16:18:26 +0000[diff] [blame]1288<div class="doc_subsection"><a name="projects"><tt>llvm/projects</tt></a></div>
1289<div class="doc_text">
1290 <p>This directory contains projects that are not strictly part of LLVM but are
1291 shipped with LLVM. This is also the directory where you should create your own
1292 LLVM-based projects. See <tt>llvm/projects/sample</tt> for an example of how
Chris Lattner7b7b6782008-08-11 06:13:31 +0000[diff] [blame]1293 to set up your own project.</p>
Reid Spencer5be4f042004-12-08 16:18:26 +0000[diff] [blame]1294</div>
1295
1296<!-- ======================================================================= -->
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1297<div class="doc_subsection"><a name="runtime"><tt>llvm/runtime</tt></a></div>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1298<div class="doc_text">
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1299
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1300<p>This directory contains libraries which are compiled into LLVM bitcode and
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1301used when linking programs with the GCC front end. Most of these libraries are
1302skeleton versions of real libraries; for example, libc is a stripped down
1303version of glibc.</p>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1304
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1305<p>Unlike the rest of the LLVM suite, this directory needs the LLVM GCC front
1306end to compile.</p>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1307
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1308</div>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1309
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1310<!-- ======================================================================= -->
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1311<div class="doc_subsection"><a name="test"><tt>llvm/test</tt></a></div>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1312<div class="doc_text">
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1313 <p>This directory contains feature and regression tests and other basic sanity
1314 checks on the LLVM infrastructure. These are intended to run quickly and cover
1315 a lot of territory without being exhaustive.</p>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1316</div>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1317
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1318<!-- ======================================================================= -->
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]1319<div class="doc_subsection"><a name="llvmtest"><tt>test-suite</tt></a></div>
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1320<div class="doc_text">
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]1321 <p>This is not a directory in the normal llvm module; it is a separate
1322 Subversion
1323 module that must be checked out (usually to <tt>projects/test-suite</tt>).
1324 This
John Criswell6ab273c2004-12-08 17:53:54 +0000[diff] [blame]1325 module contains a comprehensive correctness, performance, and benchmarking
1326 test
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]1327 suite for LLVM. It is a separate Subversion module because not every LLVM
1328 user is
John Criswellcfdeb5c2005-05-09 16:39:27 +0000[diff] [blame]1329 interested in downloading or building such a comprehensive test suite. For
1330 further details on this test suite, please see the
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1331 <a href="TestingGuide.html">Testing Guide</a> document.</p>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1332</div>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1333
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1334<!-- ======================================================================= -->
1335<div class="doc_subsection"><a name="tools"><tt>llvm/tools</tt></a></div>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1336<div class="doc_text">
John Criswell38cc2b52003-10-10 14:26:14 +0000[diff] [blame]1337
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1338<p>The <b>tools</b> directory contains the executables built out of the
1339libraries above, which form the main part of the user interface. You can
1340always get help for a tool by typing <tt>tool_name --help</tt>. The
Misha Brukmanb4bd8de2004-11-15 23:20:51 +0000[diff] [blame]1341following is a brief introduction to the most important tools. More detailed
1342information is in the <a href="CommandGuide/index.html">Command Guide</a>.</p>
John Criswell38cc2b52003-10-10 14:26:14 +0000[diff] [blame]1343
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1344<dl>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1345
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1346 <dt><tt><b>bugpoint</b></tt></dt>
1347 <dd><tt>bugpoint</tt> is used to debug
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1348 optimization passes or code generation backends by narrowing down the
1349 given test case to the minimum number of passes and/or instructions that
1350 still cause a problem, whether it is a crash or miscompilation. See <a
1351 href="HowToSubmitABug.html">HowToSubmitABug.html</a> for more information
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1352 on using <tt>bugpoint</tt>.</dd>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1353
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1354 <dt><tt><b>llvmc</b></tt></dt>
1355 <dd>The LLVM Compiler Driver. This program can
1356 be configured to utilize both LLVM and non-LLVM compilation tools to enable
1357 pre-processing, translation, optimization, assembly, and linking of programs
1358 all from one command line. <tt>llvmc</tt> also takes care of processing the
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1359 dependent libraries found in bitcode. This reduces the need to get the
Reid Spencer92815e52004-12-08 18:00:30 +0000[diff] [blame]1360 traditional <tt>-l&lt;name&gt;</tt> options right on the command line. Please
John Criswelle1a81202005-05-18 19:43:33 +0000[diff] [blame]1361 note that this tool, while functional, is still experimental and not feature
1362 complete.</dd>
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1363
1364 <dt><tt><b>llvm-ar</b></tt></dt>
1365 <dd>The archiver produces an archive containing
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1366 the given LLVM bitcode files, optionally with an index for faster
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1367 lookup.</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1368
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1369 <dt><tt><b>llvm-as</b></tt></dt>
1370 <dd>The assembler transforms the human readable LLVM assembly to LLVM
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1371 bitcode.</dd>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1372
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1373 <dt><tt><b>llvm-dis</b></tt></dt>
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1374 <dd>The disassembler transforms the LLVM bitcode to human readable
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1375 LLVM assembly.</dd>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1376
Reid Spencer92815e52004-12-08 18:00:30 +0000[diff] [blame]1377 <dt><tt><b>llvm-ld</b></tt></dt>
Reid Spencera7974cc2007-02-09 15:59:08 +0000[diff] [blame]1378 <dd><tt>llvm-ld</tt> is a general purpose and extensible linker for LLVM.
1379 This is the linker invoked by <tt>llvmc</tt>. It performsn standard link time
1380 optimizations and allows optimization modules to be loaded and run so that
1381 language specific optimizations can be applied at link time.</dd>
Reid Spencer92815e52004-12-08 18:00:30 +0000[diff] [blame]1382
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1383 <dt><tt><b>llvm-link</b></tt></dt>
1384 <dd><tt>llvm-link</tt>, not surprisingly, links multiple LLVM modules into
1385 a single program.</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1386
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1387 <dt><tt><b>lli</b></tt></dt>
1388 <dd><tt>lli</tt> is the LLVM interpreter, which
Nick Lewycky97467822007-12-03 01:58:01 +0000[diff] [blame]1389 can directly execute LLVM bitcode (although very slowly...). For architectures
1390 that support it (currently x86, Sparc, and PowerPC), by default, <tt>lli</tt>
1391 will function as a Just-In-Time compiler (if the functionality was compiled
1392 in), and will execute the code <i>much</i> faster than the interpreter.</dd>
Misha Brukman994d7e82003-10-06 19:23:34 +0000[diff] [blame]1393
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1394 <dt><tt><b>llc</b></tt></dt>
1395 <dd> <tt>llc</tt> is the LLVM backend compiler, which
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1396 translates LLVM bitcode to a native code assembly file or to C code (with
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1397 the -march=c option).</dd>
Misha Brukman994d7e82003-10-06 19:23:34 +0000[diff] [blame]1398
Reid Spencer788b0fd2004-12-22 06:29:07 +0000[diff] [blame]1399 <dt><tt><b>llvm-gcc</b></tt></dt>
Reid Spencera7974cc2007-02-09 15:59:08 +0000[diff] [blame]1400 <dd><tt>llvm-gcc</tt> is a GCC-based C frontend that has been retargeted to
1401 use LLVM as its backend instead of GCC's RTL backend. It can also emit LLVM
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1402 bitcode or assembly (with the <tt>-emit-llvm</tt> option) instead of the
Reid Spencera7974cc2007-02-09 15:59:08 +0000[diff] [blame]1403 usual machine code output. It works just like any other GCC compiler,
1404 taking the typical <tt>-c, -S, -E, -o</tt> options that are typically used.
1405 Additionally, the the source code for <tt>llvm-gcc</tt> is available as a
John Criswell58594852007-06-29 19:12:31 +0000[diff] [blame]1406 separate Subversion module.</dd>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1407
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1408 <dt><tt><b>opt</b></tt></dt>
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1409 <dd><tt>opt</tt> reads LLVM bitcode, applies a series of LLVM to LLVM
Reid Spencer80f843d2006-08-28 00:34:19 +0000[diff] [blame]1410 transformations (which are specified on the command line), and then outputs
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1411 the resultant bitcode. The '<tt>opt --help</tt>' command is a good way to
Reid Spencer80f843d2006-08-28 00:34:19 +0000[diff] [blame]1412 get a list of the program transformations available in LLVM.<br/>
1413 <dd><tt>opt</tt> can also be used to run a specific analysis on an input
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1414 LLVM bitcode file and print out the results. It is primarily useful for
Reid Spencer80f843d2006-08-28 00:34:19 +0000[diff] [blame]1415 debugging analyses, or familiarizing yourself with what an analysis does.</dd>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1416</dl>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1417</div>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1418
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1419<!-- ======================================================================= -->
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1420<div class="doc_subsection"><a name="utils"><tt>llvm/utils</tt></a></div>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1421<div class="doc_text">
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1422
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1423<p>This directory contains utilities for working with LLVM source code, and some
1424of the utilities are actually required as part of the build process because they
1425are code generators for parts of LLVM infrastructure.</p>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1426
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1427<dl>
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1428 <dt><tt><b>codegen-diff</b></tt> <dd><tt>codegen-diff</tt> is a script
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1429 that finds differences between code that LLC generates and code that LLI
1430 generates. This is a useful tool if you are debugging one of them,
1431 assuming that the other generates correct output. For the full user
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1432 manual, run <tt>`perldoc codegen-diff'</tt>.<br><br>
Misha Brukmanefe54be2003-08-11 18:45:46 +0000[diff] [blame]1433
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1434 <dt><tt><b>emacs/</b></tt> <dd>The <tt>emacs</tt> directory contains
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1435 syntax-highlighting files which will work with Emacs and XEmacs editors,
1436 providing syntax highlighting support for LLVM assembly files and TableGen
1437 description files. For information on how to use the syntax files, consult
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1438 the <tt>README</tt> file in that directory.<br><br>
Misha Brukmanefe54be2003-08-11 18:45:46 +0000[diff] [blame]1439
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1440 <dt><tt><b>getsrcs.sh</b></tt> <dd>The <tt>getsrcs.sh</tt> script finds
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1441 and outputs all non-generated source files, which is useful if one wishes
1442 to do a lot of development across directories and does not want to
1443 individually find each file. One way to use it is to run, for example:
1444 <tt>xemacs `utils/getsources.sh`</tt> from the top of your LLVM source
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1445 tree.<br><br>
1446
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1447 <dt><tt><b>llvmgrep</b></tt></dt>
1448 <dd>This little tool performs an "egrep -H -n" on each source file in LLVM and
1449 passes to it a regular expression provided on <tt>llvmgrep</tt>'s command
1450 line. This is a very efficient way of searching the source base for a
1451 particular regular expression.</dd>
1452
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1453 <dt><tt><b>makellvm</b></tt> <dd>The <tt>makellvm</tt> script compiles all
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1454 files in the current directory and then compiles and links the tool that
1455 is the first argument. For example, assuming you are in the directory
1456 <tt>llvm/lib/Target/Sparc</tt>, if <tt>makellvm</tt> is in your path,
1457 simply running <tt>makellvm llc</tt> will make a build of the current
1458 directory, switch to directory <tt>llvm/tools/llc</tt> and build it,
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1459 causing a re-linking of LLC.<br><br>
Misha Brukmanefe54be2003-08-11 18:45:46 +0000[diff] [blame]1460
Tanya Lattner3e852072007-05-22 06:12:51 +0000[diff] [blame]1461 <dt><tt><b>NewNightlyTest.pl</b></tt> and
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1462 <tt><b>NightlyTestTemplate.html</b></tt> <dd>These files are used in a
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1463 cron script to generate nightly status reports of the functionality of
1464 tools, and the results can be seen by following the appropriate link on
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1465 the <a href="http://llvm.org/">LLVM homepage</a>.<br><br>
Misha Brukmanefe54be2003-08-11 18:45:46 +0000[diff] [blame]1466
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1467 <dt><tt><b>TableGen/</b></tt> <dd>The <tt>TableGen</tt> directory contains
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1468 the tool used to generate register descriptions, instruction set
1469 descriptions, and even assemblers from common TableGen description
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1470 files.<br><br>
Misha Brukmanefe54be2003-08-11 18:45:46 +0000[diff] [blame]1471
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1472 <dt><tt><b>vim/</b></tt> <dd>The <tt>vim</tt> directory contains
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1473 syntax-highlighting files which will work with the VIM editor, providing
1474 syntax highlighting support for LLVM assembly files and TableGen
1475 description files. For information on how to use the syntax files, consult
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1476 the <tt>README</tt> file in that directory.<br><br>
Misha Brukmanefe54be2003-08-11 18:45:46 +0000[diff] [blame]1477
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1478</dl>
Misha Brukmanefe54be2003-08-11 18:45:46 +0000[diff] [blame]1479
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1480</div>
Misha Brukmanefe54be2003-08-11 18:45:46 +0000[diff] [blame]1481
Reid Spencer5be4f042004-12-08 16:18:26 +0000[diff] [blame]1482<!-- ======================================================================= -->
1483<div class="doc_subsection"><a name="win32"><tt>llvm/win32</tt></a></div>
1484<div class="doc_text">
1485 <p>This directory contains build scripts and project files for use with
1486 Visual C++. This allows developers on Windows to build LLVM without the need
John Criswell6ab273c2004-12-08 17:53:54 +0000[diff] [blame]1487 for Cygwin. The contents of this directory should be considered experimental
Reid Spencer5be4f042004-12-08 16:18:26 +0000[diff] [blame]1488 at this time.
1489 </p>
1490</div>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1491<!-- *********************************************************************** -->
1492<div class="doc_section">
1493 <a name="tutorial">An Example Using the LLVM Tool Chain</a>
1494</div>
1495<!-- *********************************************************************** -->
Misha Brukmanefe54be2003-08-11 18:45:46 +0000[diff] [blame]1496
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1497<div class="doc_text">
Chris Lattner424d4dc2007-01-04 07:08:27 +0000[diff] [blame]1498<p>This section gives an example of using LLVM. llvm-gcc3 is now obsolete,
1499so we only include instructiosn for llvm-gcc4.
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1500</p>
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1501
1502<p><b>Note:</b> The <i>gcc4</i> frontend's invocation is <b><i>considerably different</i></b>
1503from the previous <i>gcc3</i> frontend. In particular, the <i>gcc4</i> frontend <b><i>does not</i></b>
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1504create bitcode by default: <i>gcc4</i> produces native code. As the example below illustrates,
1505the '--emit-llvm' flag is needed to produce LLVM bitcode output. For <i>makefiles</i> and
1506<i>configure</i> scripts, the CFLAGS variable needs '--emit-llvm' to produce bitcode
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1507output.</p>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1508</div>
1509
1510<!-- ======================================================================= -->
Chris Lattner4d7ce8a2006-09-07 04:19:09 +0000[diff] [blame]1511<div class="doc_subsection"><a name="tutorial4">Example with llvm-gcc4</a></div>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1512
1513<div class="doc_text">
1514
1515<ol>
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1516 <li><p>First, create a simple C file, name it 'hello.c':</p>
1517
1518<div class="doc_code">
1519<pre>
1520#include &lt;stdio.h&gt;
1521
1522int main() {
1523 printf("hello world\n");
1524 return 0;
1525}
1526</pre></div></li>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1527
1528 <li><p>Next, compile the C file into a native executable:</p>
1529
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1530 <div class="doc_code"><pre>% llvm-gcc hello.c -o hello</pre></div>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1531
1532 <p>Note that llvm-gcc works just like GCC by default. The standard -S and
1533 -c arguments work as usual (producing a native .s or .o file,
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1534 respectively).</p></li>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1535
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1536 <li><p>Next, compile the C file into a LLVM bitcode file:</p>
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1537
1538 <div class="doc_code">
1539 <pre>% llvm-gcc -O3 -emit-llvm hello.c -c -o hello.bc</pre></div>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1540
1541 <p>The -emit-llvm option can be used with the -S or -c options to emit an
1542 LLVM ".ll" or ".bc" file (respectively) for the code. This allows you
1543 to use the <a href="CommandGuide/index.html">standard LLVM tools</a> on
Gabor Greifa54634a2007-07-06 22:07:22 +0000[diff] [blame]1544 the bitcode file.</p>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1545
1546 <p>Unlike llvm-gcc3, llvm-gcc4 correctly responds to -O[0123] arguments.
1547 </p></li>
1548
1549 <li><p>Run the program in both forms. To run the program, use:</p>
1550
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1551 <div class="doc_code"><pre>% ./hello</pre></div>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1552
1553 <p>and</p>
1554
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1555 <div class="doc_code"><pre>% lli hello.bc</pre></div>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1556
1557 <p>The second examples shows how to invoke the LLVM JIT, <a
Chris Lattnerc7443af2006-08-14 20:51:35 +0000[diff] [blame]1558 href="CommandGuide/html/lli.html">lli</a>.</p></li>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1559
1560 <li><p>Use the <tt>llvm-dis</tt> utility to take a look at the LLVM assembly
1561 code:</p>
1562
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1563<div class="doc_code">
1564<pre>llvm-dis &lt; hello.bc | less</pre>
1565</div></li>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1566
1567 <li><p>Compile the program to native assembly using the LLC code
1568 generator:</p>
1569
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1570 <div class="doc_code"><pre>% llc hello.bc -o hello.s</pre></div></li>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1571
1572 <li><p>Assemble the native assembly language file into a program:</p>
1573
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1574<div class="doc_code">
1575<pre>
1576<b>Solaris:</b> % /opt/SUNWspro/bin/cc -xarch=v9 hello.s -o hello.native
1577
1578<b>Others:</b> % gcc hello.s -o hello.native
1579</pre>
1580</div></li>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1581
1582 <li><p>Execute the native code program:</p>
1583
Bill Wendlingbcb3b412007-07-16 08:44:39 +0000[diff] [blame]1584 <div class="doc_code"><pre>% ./hello.native</pre></div>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1585
1586 <p>Note that using llvm-gcc to compile directly to native code (i.e. when
1587 the -emit-llvm option is not present) does steps 6/7/8 for you.</p>
Chris Lattnerc7443af2006-08-14 20:51:35 +0000[diff] [blame]1588 </li>
Chris Lattner5b560d92006-08-14 20:45:25 +0000[diff] [blame]1589
1590</ol>
1591
1592</div>
1593
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1594
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1595<!-- *********************************************************************** -->
1596<div class="doc_section">
1597 <a name="problems">Common Problems</a>
1598</div>
1599<!-- *********************************************************************** -->
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1600
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1601<div class="doc_text">
John Criswellc5eb4602003-07-03 16:01:38 +0000[diff] [blame]1602
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1603<p>If you are having problems building or using LLVM, or if you have any other
1604general questions about LLVM, please consult the <a href="FAQ.html">Frequently
1605Asked Questions</a> page.</p>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1606
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1607</div>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1608
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1609<!-- *********************************************************************** -->
1610<div class="doc_section">
1611 <a name="links">Links</a>
1612</div>
1613<!-- *********************************************************************** -->
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1614
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1615<div class="doc_text">
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1616
Bill Wendlingcb13d702008-07-22 01:10:25 +0000[diff] [blame]1617<p>This document is just an <b>introduction</b> on how to use LLVM to do
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1618some simple things... there are many more interesting and complicated things
1619that you can do that aren't documented here (but we'll gladly accept a patch
1620if you want to write something up!). For more information about LLVM, check
1621out:</p>
John Criswell72989a52003-06-12 19:34:44 +0000[diff] [blame]1622
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1623<ul>
Reid Spencerca058542006-03-14 05:39:39 +0000[diff] [blame]1624 <li><a href="http://llvm.org/">LLVM homepage</a></li>
1625 <li><a href="http://llvm.org/doxygen/">LLVM doxygen tree</a></li>
1626 <li><a href="http://llvm.org/docs/Projects.html">Starting a Project
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1627 that Uses LLVM</a></li>
1628</ul>
1629
1630</div>
1631
1632<!-- *********************************************************************** -->
1633
1634<hr>
Misha Brukman74d4df82003-11-22 01:30:01 +0000[diff] [blame]1635<address>
Misha Brukmand3de5c62004-01-20 00:20:17 +0000[diff] [blame]1636 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
1637 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
1638 <a href="http://validator.w3.org/check/referer"><img
1639 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
1640
Misha Brukman74d4df82003-11-22 01:30:01 +0000[diff] [blame]1641 <a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
Reid Spencer075de232004-09-05 20:50:22 +0000[diff] [blame]1642 <a href="http://llvm.x10sys.com/rspencer/">Reid Spencer</a><br>
Reid Spencerca058542006-03-14 05:39:39 +0000[diff] [blame]1643 <a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1644 Last modified: $Date$
Misha Brukman74d4df82003-11-22 01:30:01 +0000[diff] [blame]1645</address>
Misha Brukman560e9892003-11-07 19:43:14 +0000[diff] [blame]1646</body>
Guochun Shib65a78e2002-07-17 23:05:56 +0000[diff] [blame]1647</html>