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3<html>
4<head>
5 <title>Building LLVM with CMake</title>
6 <link rel="stylesheet" href="llvm.css" type="text/css">
7</head>
8
9<div class="doc_title">
10 Building LLVM with CMake
11</div>
12
13<ul>
14 <li><a href="#intro">Introduction</a></li>
15 <li><a href="#quickstart">Quick start</a></li>
16 <li><a href="#usage">Basic CMake usage</a>
17 <li><a href="#options">Options and variables</a>
Oscar Fuentes0c913732008-12-31 14:36:41 +0000[diff] [blame^]18 <ul>
Oscar Fuentes25f1d032008-11-20 22:05:48 +0000[diff] [blame]19 <li><a href="#freccmake">Frequently-used CMake variables</a></li>
20 <li><a href="#llvmvars">LLVM-specific variables</a></li>
21 </ul></li>
22 <li><a href="#testing">Executing the test suite</a>
23 <li><a href="#cross">Cross compiling</a>
24 <li><a href="#embedding">Embedding LLVM in your project</a>
Oscar Fuentes0c913732008-12-31 14:36:41 +0000[diff] [blame^]25 <li><a href="#specifics">Compiler/Platform specific topics</a>
26 <ul>
27 <li><a href="#msvc">Microsoft Visual C++</a></li>
28 </ul></li>
Oscar Fuentes25f1d032008-11-20 22:05:48 +0000[diff] [blame]29</ul>
30
31<div class="doc_author">
Oscar Fuentes370387c2008-11-20 23:35:09 +0000[diff] [blame]32<p>Written by <a href="mailto:ofv@wanadoo.es">Oscar Fuentes</a></p>
Oscar Fuentes25f1d032008-11-20 22:05:48 +0000[diff] [blame]33</div>
34
35<!-- *********************************************************************** -->
36<div class="doc_section">
37<a name="intro">Introduction</a>
38</div>
39<!-- *********************************************************************** -->
40
41<div class="doc_text">
42
43 <p><a href="http://www.cmake.org/">CMake</a> is a cross-platform
44 build-generator tool. CMake does not build the project, it generates
45 the files needed by your build tool (GNU make, Visual Studio, etc) for
46 building LLVM.</p>
47
Oscar Fuentes370387c2008-11-20 23:35:09 +0000[diff] [blame]48 <p>If you are really anxious about getting a functional LLVM build,
49 go to the <a href="#quickstart">Quick start</a> section. If you
50 are a CMake novice, start on <a href="#usage">Basic CMake
51 usage</a> and then go back to the <a href="#quickstart">Quick
52 start</a> once you know what you are
53 doing. The <a href="#options">Options and variables</a> section
54 is a reference for customizing your build. If you already have
55 experience with CMake, this is the recommended starting point.
Oscar Fuentes25f1d032008-11-20 22:05:48 +0000[diff] [blame]56</div>
57
58<!-- *********************************************************************** -->
59<div class="doc_section">
60<a name="quickstart">Quick start</a>
61</div>
62<!-- *********************************************************************** -->
63
64<div class="doc_text">
65
66<p> We use here the command-line, non-interactive CMake interface </p>
67
68<ol>
69
70 <li><p><a href=http://www.cmake.org/cmake/resources/software.html>Download</a>
71 and install CMake. Version 2.6.2 is the minimum required.</p>
72
73 <li><p>Open a shell. Your development tools must be reachable from this
74 shell through the PATH environment variable.</p>
75
76 <li><p>Create a directory for containing the build. It is not
77 supported to build LLVM on the source directory. cd to this
78 directory:</p>
79 <div class="doc_code">
80 <p><tt>mkdir mybuilddir</tt></p>
81 <p><tt>cd mybuilddir</tt></p>
82 </div>
83
84 <li><p>Execute this command on the shell
85 replacing <i>path/to/llvm/source/root</i> with the path to the
86 root of your LLVM source tree:</p>
87 <div class="doc_code">
88 <p><tt>cmake path/to/llvm/source/root</tt></p>
89 </div>
90
91 <p>CMake will detect your development environment, perform a
92 series of test and generate the files required for building
93 LLVM. CMake will use default values for all build
94 parameters. See the <a href="#options">Options and variables</a>
95 section for fine-tuning your build</p>
96
97 <p>This can fail if CMake can't detect your toolset, or if it
98 thinks that the environment is not sane enough. On this case
99 make sure that the toolset that you intend to use is the only
100 one reachable from the shell and that the shell itself is the
101 correct one for you development environment. CMake will refuse
102 to build MinGW makefiles if you have a POSIX shell reachable
103 through the PATH environment variable, for instance. You can
104 force CMake to use a given build tool, see
105 the <a href="#usage">Usage</a> section.</p>
106
107</ol>
108
109</div>
110
111<!-- *********************************************************************** -->
112<div class="doc_section">
113 <a name="usage">Basic CMake usage</a>
114</div>
115<!-- *********************************************************************** -->
116
117<div class="doc_text">
118
Oscar Fuentes370387c2008-11-20 23:35:09 +0000[diff] [blame]119 <p>This section explains basic aspects of CMake, mostly for
120 explaining those options which you may need on your day-to-day
121 usage.</p>
122
123 <p>CMake comes with extensive documentation in the form of html
124 files and on the cmake executable itself. Execute <i>cmake
125 --help</i> for further help options.</p>
126
127 <p>CMake requires to know for which build tool it shall generate
128 files (GNU make, Visual Studio, Xcode, etc). If not specified on
129 the command line, it tries to guess it based on you
130 environment. Once identified the build tool, CMake uses the
131 corresponding <i>Generator</i> for creating files for your build
132 tool. You can explicitly specify the generator with the command
133 line option <i>-G "Name of the generator"</i>. For knowing the
134 available generators on your platform, execute</p>
135
136 <div class="doc_code">
137 <p><tt>cmake --help</tt></p>
138 </div>
139
140 <p>This will list the generator's names at the end of the help
141 text. Generator's names are case-sensitive. Example:</p>
142
143 <div class="doc_code">
144 <p><tt>cmake -G "Visual Studio 8 2005" path/to/llvm/source/root</tt></p>
145 </div>
146
147 <p>For a given development platform there can be more than one
148 adequate generator. If you use Visual Studio "NMake Makefiles"
149 is a generator you can use for building with NMake. By default,
150 CMake chooses the more specific generator supported by your
151 development environment. If you want an alternative generator,
152 you must tell this to CMake with the <i>-G</i> option.</p>
153
154 <p>TODO: explain variables and cache. Move explanation here from
155 #options section.</p>
Oscar Fuentes25f1d032008-11-20 22:05:48 +0000[diff] [blame]156
157</div>
158
159<!-- *********************************************************************** -->
160<div class="doc_section">
161 <a name="options">Options and variables</a>
162</div>
163<!-- *********************************************************************** -->
164
165<div class="doc_text">
166
167 <p>Variables customize how the build will be generated. Options are
168 boolean variables, with possible values ON/OFF. Options and
169 variables are defined on the CMake command line like this:</p>
170
171 <div class="doc_code">
172 <p><tt>cmake -DVARIABLE=value path/to/llvm/source</tt></p>
173 </div>
174
175 <p>You can set a variable after the initial CMake invocation for
176 changing its value. You can also undefine a variable:</p>
177
178 <div class="doc_code">
179 <p><tt>cmake -UVARIABLE path/to/llvm/source</tt></p>
180 </div>
181
182 <p>Variables are stored on the CMake cache. This is a file
183 named <it>CMakeCache.txt</it> on the root of the build
184 directory. Do not hand-edit it.</p>
185
186 <p>Variables are listed here appending its type after a colon. It is
187 correct to write the variable and the type on the CMake command
188 line:</p>
189
190 <div class="doc_code">
191 <p><tt>cmake -DVARIABLE:TYPE=value path/to/llvm/source</tt></p>
192 </div>
193
194</div>
195
196<!-- ======================================================================= -->
197<div class="doc_subsection">
198 <a name="freccmake">Frequently-used CMake variables</a>
199</div>
200
201<div class="doc_text">
202
203<p>Here are listed some of the CMake variables that are used often,
204 along with a brief explanation and LLVM-specific notes. For full
205 documentation, check the CMake docs or execute <i>cmake
Oscar Fuentes0c913732008-12-31 14:36:41 +0000[diff] [blame^]206 --help-variable VARIABLE_NAME</i>.</p>
Oscar Fuentes25f1d032008-11-20 22:05:48 +0000[diff] [blame]207
208<dl>
209 <dt><b>CMAKE_BUILD_TYPE</b>:STRING</dt>
210
211 <dd>Sets the build type for <i>make</i> based generators. Possible
212 values are Release, Debug, RelWithDebInfo and MiniSizeRel. On
213 systems like Visual Studio the user sets the build type with the IDE
214 settings.</dd>
215
216 <dt><b>CMAKE_INSTALL_PREFIX</b>:PATH</dt>
217 <dd>Path where LLVM will be installed if "make install" is invoked
218 or the "INSTALL" target is built.</dd>
219
Oscar Fuentesb6c22022008-11-25 04:23:36 +0000[diff] [blame]220 <dt><b>CMAKE_C_FLAGS</b>:STRING</dt>
221 <dd>Extra flags to use when compiling C source files.</dd>
222
223 <dt><b>CMAKE_CXX_FLAGS</b>:STRING</dt>
224 <dd>Extra flags to use when compiling C++ source files.</dd>
225
Oscar Fuentes25f1d032008-11-20 22:05:48 +0000[diff] [blame]226 <dt><b>BUILD_SHARED_LIBS</b>:BOOL</dt>
227 <dd>Flag indicating is shared libraries will be built. Its default
228 value is OFF. Shared libraries are not supported on Windows and
229 not recommended in the other OSes.</dd>
230</dl>
231
232</div>
233
234<!-- ======================================================================= -->
235<div class="doc_subsection">
236 <a name="llvmvars">LLVM-specific variables</a>
237</div>
238
239<div class="doc_text">
240
241<dl>
242 <dt><b>LLVM_TARGETS_TO_BUILD</b>:STRING</dt>
243 <dd>Semicolon-separated list of targets to build, or <i>all</i> for
244 building all targets. Case-sensitive. For Visual C++ defaults
245 to <i>X86</i>. On the other cases defaults to <i>all</i>. Example:
246 <i>-DLLVM_TARGETS_TO_BUILD="X86;PowerPC;Alpha"</i>.</dd>
247
248 <dt><b>LLVM_ENABLE_THREADS</b>:BOOL</dt>
249 <dd>Build with threads support, if available. Defaults to ON.</dd>
250
251 <dt><b>LLVM_ENABLE_PIC</b>:BOOL</dt>
252 <dd>Add the <i>-fPIC</i> flag to the compiler command-line, if the
253 compiler supports this flag. Some systems, like Windows, does not
254 need this flag. Defaults to OFF.</dd>
255
256 <dt><b>LLVM_BUILD_32_BITS</b>:BOOL</dt>
257 <dd>Build 32-bits executables and libraries on 64-bits systems. This
258 option is available only on some 64-bits unix systems. Defaults to
259 OFF.</dd>
260
261 <dt><b>LLVM_PLO_FLAGS</b>:STRING</dt>
262 <dd>Extra flags for creating partially linked objects. Visual C++
263 does not use this.</dd>
264
265 <dt><b>LLVM_TABLEGEN</b>:STRING</dt>
266 <dd>Full path to a native TableGen executable (usually
267 named <i>tblgen</i>). This is intented for cross-compiling: if the
268 user sets this variable, no native TableGen will be created.</dd>
269</dl>
270
271</div>
272
273<!-- *********************************************************************** -->
274<div class="doc_section">
275 <a name="testing">Executing the test suite</a>
276</div>
277<!-- *********************************************************************** -->
278
279<div class="doc_text">
280
Oscar Fuentes370387c2008-11-20 23:35:09 +0000[diff] [blame]281<p>LLVM testing is not supported on Visual Studio.</p>
282
Oscar Fuentes25f1d032008-11-20 22:05:48 +0000[diff] [blame]283<p>TODO</p>
284
285</div>
286
287<!-- *********************************************************************** -->
288<div class="doc_section">
289 <a name="cross">Cross compiling</a>
290</div>
291<!-- *********************************************************************** -->
292
293<div class="doc_text">
294
295<p>TODO</p>
296
297</div>
298
299<!-- *********************************************************************** -->
300<div class="doc_section">
301 <a name="embedding">Embedding LLVM in your project</a>
302</div>
303<!-- *********************************************************************** -->
304
305<div class="doc_text">
306
307<p>TODO</p>
308
309</div>
310
311<!-- *********************************************************************** -->
312
Oscar Fuentes0c913732008-12-31 14:36:41 +0000[diff] [blame^]313<!-- *********************************************************************** -->
314<div class="doc_section">
315 <a name="specifics">Compiler/Platform specific topics</a>
316</div>
317<!-- *********************************************************************** -->
318
319<div class="doc_text">
320
321<p>Notes for specific compilers and/or platforms.</p>
322
323</div>
324
325<!-- ======================================================================= -->
326<div class="doc_subsection">
327 <a name="msvc">Microsoft Visual C++</a>
328</div>
329
330<div class="doc_text">
331
332 <p>For linking the JIT into your executable, add</p>
333
334 <div class="doc_code">
335 <p><tt>/INCLUDE:_X86TargetMachineModule</tt></p>
336 </div>
337
338 <p>to your linker options. This is required for adding the relevant
339 LLVM object code to the executable. Not doing this will result on
340 some methods returning NULL (<i>ExecutionEngine::create</i>, for
341 instance).</p>
342
343</div>
344
345<!-- *********************************************************************** -->
346
Oscar Fuentes25f1d032008-11-20 22:05:48 +0000[diff] [blame]347<hr>
348<address>
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Oscar Fuentes25f1d032008-11-20 22:05:48 +0000[diff] [blame]353
Oscar Fuentes370387c2008-11-20 23:35:09 +0000[diff] [blame]354 <a href="mailto:ofv@wanadoo.es">Oscar Fuentes</a><br>
Oscar Fuentes25f1d032008-11-20 22:05:48 +0000[diff] [blame]355 <a href="http://llvm.org">LLVM Compiler Infrastructure</a><br>
Oscar Fuentes0c913732008-12-31 14:36:41 +0000[diff] [blame^]356 Last modified: $Date: 2008-12-31 03:59:36 +0100 (Wed, 31 Dec 2008) $
Oscar Fuentes25f1d032008-11-20 22:05:48 +0000[diff] [blame]357</address>
358
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360</html>