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gerrit-public.fairphone.software / toolchain / llvm-project / fc8d930f6ef1aa4fbd402c5b36f734214863d5d4 / . / llvm / docs / CMake.html
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2 "http://www.w3.org/TR/html4/strict.dtd">
3<html>
4<head>
5 <title>Building LLVM with CMake</title>
6 <link rel="stylesheet" href="llvm.css" type="text/css">
7</head>
8
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]9<h1>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]10 Building LLVM with CMake
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]11</h1>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]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 Fuentes2cc3ce02008-12-31 14:36:41 +0000[diff] [blame]18 <ul>
Oscar Fuentes8395ac92008-11-20 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 Fuentes23fe31c2011-04-12 19:40:35 +0000[diff] [blame]25 <ul>
26 <li><a href="#passdev">Developing LLVM pass out of source</a></li>
27 </ul></li>
Oscar Fuentes2cc3ce02008-12-31 14:36:41 +0000[diff] [blame]28 <li><a href="#specifics">Compiler/Platform specific topics</a>
29 <ul>
30 <li><a href="#msvc">Microsoft Visual C++</a></li>
31 </ul></li>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]32</ul>
33
34<div class="doc_author">
Oscar Fuentes50ff1542008-11-20 23:35:09 +0000[diff] [blame]35<p>Written by <a href="mailto:ofv@wanadoo.es">Oscar Fuentes</a></p>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]36</div>
37
38<!-- *********************************************************************** -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]39<h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]40<a name="intro">Introduction</a>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]41</h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]42<!-- *********************************************************************** -->
43
44<div class="doc_text">
45
46 <p><a href="http://www.cmake.org/">CMake</a> is a cross-platform
47 build-generator tool. CMake does not build the project, it generates
48 the files needed by your build tool (GNU make, Visual Studio, etc) for
49 building LLVM.</p>
50
Oscar Fuentes50ff1542008-11-20 23:35:09 +0000[diff] [blame]51 <p>If you are really anxious about getting a functional LLVM build,
52 go to the <a href="#quickstart">Quick start</a> section. If you
53 are a CMake novice, start on <a href="#usage">Basic CMake
54 usage</a> and then go back to the <a href="#quickstart">Quick
55 start</a> once you know what you are
56 doing. The <a href="#options">Options and variables</a> section
57 is a reference for customizing your build. If you already have
58 experience with CMake, this is the recommended starting point.
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]59</div>
60
61<!-- *********************************************************************** -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]62<h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]63<a name="quickstart">Quick start</a>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]64</h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]65<!-- *********************************************************************** -->
66
67<div class="doc_text">
68
69<p> We use here the command-line, non-interactive CMake interface </p>
70
71<ol>
72
Benjamin Kramereaccdd32009-08-05 15:42:44 +0000[diff] [blame]73 <li><p><a href="http://www.cmake.org/cmake/resources/software.html">Download</a>
Oscar Fuentese1c6a672010-11-25 21:41:48 +0000[diff] [blame]74 and install CMake. Version 2.8 is the minimum required.</p>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]75
76 <li><p>Open a shell. Your development tools must be reachable from this
77 shell through the PATH environment variable.</p>
78
79 <li><p>Create a directory for containing the build. It is not
80 supported to build LLVM on the source directory. cd to this
81 directory:</p>
82 <div class="doc_code">
83 <p><tt>mkdir mybuilddir</tt></p>
84 <p><tt>cd mybuilddir</tt></p>
85 </div>
86
87 <li><p>Execute this command on the shell
88 replacing <i>path/to/llvm/source/root</i> with the path to the
89 root of your LLVM source tree:</p>
90 <div class="doc_code">
91 <p><tt>cmake path/to/llvm/source/root</tt></p>
92 </div>
93
94 <p>CMake will detect your development environment, perform a
95 series of test and generate the files required for building
96 LLVM. CMake will use default values for all build
97 parameters. See the <a href="#options">Options and variables</a>
98 section for fine-tuning your build</p>
99
100 <p>This can fail if CMake can't detect your toolset, or if it
101 thinks that the environment is not sane enough. On this case
102 make sure that the toolset that you intend to use is the only
103 one reachable from the shell and that the shell itself is the
104 correct one for you development environment. CMake will refuse
105 to build MinGW makefiles if you have a POSIX shell reachable
106 through the PATH environment variable, for instance. You can
107 force CMake to use a given build tool, see
108 the <a href="#usage">Usage</a> section.</p>
109
110</ol>
111
112</div>
113
114<!-- *********************************************************************** -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]115<h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]116 <a name="usage">Basic CMake usage</a>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]117</h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]118<!-- *********************************************************************** -->
119
120<div class="doc_text">
121
Oscar Fuentes50ff1542008-11-20 23:35:09 +0000[diff] [blame]122 <p>This section explains basic aspects of CMake, mostly for
123 explaining those options which you may need on your day-to-day
124 usage.</p>
125
126 <p>CMake comes with extensive documentation in the form of html
127 files and on the cmake executable itself. Execute <i>cmake
128 --help</i> for further help options.</p>
129
130 <p>CMake requires to know for which build tool it shall generate
131 files (GNU make, Visual Studio, Xcode, etc). If not specified on
132 the command line, it tries to guess it based on you
133 environment. Once identified the build tool, CMake uses the
134 corresponding <i>Generator</i> for creating files for your build
135 tool. You can explicitly specify the generator with the command
136 line option <i>-G "Name of the generator"</i>. For knowing the
137 available generators on your platform, execute</p>
138
139 <div class="doc_code">
140 <p><tt>cmake --help</tt></p>
141 </div>
142
143 <p>This will list the generator's names at the end of the help
144 text. Generator's names are case-sensitive. Example:</p>
145
146 <div class="doc_code">
147 <p><tt>cmake -G "Visual Studio 8 2005" path/to/llvm/source/root</tt></p>
148 </div>
149
150 <p>For a given development platform there can be more than one
151 adequate generator. If you use Visual Studio "NMake Makefiles"
152 is a generator you can use for building with NMake. By default,
153 CMake chooses the more specific generator supported by your
154 development environment. If you want an alternative generator,
155 you must tell this to CMake with the <i>-G</i> option.</p>
156
157 <p>TODO: explain variables and cache. Move explanation here from
158 #options section.</p>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]159
160</div>
161
162<!-- *********************************************************************** -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]163<h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]164 <a name="options">Options and variables</a>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]165</h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]166<!-- *********************************************************************** -->
167
168<div class="doc_text">
169
170 <p>Variables customize how the build will be generated. Options are
171 boolean variables, with possible values ON/OFF. Options and
172 variables are defined on the CMake command line like this:</p>
173
174 <div class="doc_code">
175 <p><tt>cmake -DVARIABLE=value path/to/llvm/source</tt></p>
176 </div>
177
178 <p>You can set a variable after the initial CMake invocation for
179 changing its value. You can also undefine a variable:</p>
180
181 <div class="doc_code">
182 <p><tt>cmake -UVARIABLE path/to/llvm/source</tt></p>
183 </div>
184
185 <p>Variables are stored on the CMake cache. This is a file
Benjamin Kramereaccdd32009-08-05 15:42:44 +0000[diff] [blame]186 named <tt>CMakeCache.txt</tt> on the root of the build
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]187 directory. Do not hand-edit it.</p>
188
189 <p>Variables are listed here appending its type after a colon. It is
190 correct to write the variable and the type on the CMake command
191 line:</p>
192
193 <div class="doc_code">
194 <p><tt>cmake -DVARIABLE:TYPE=value path/to/llvm/source</tt></p>
195 </div>
196
197</div>
198
199<!-- ======================================================================= -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]200<h3>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]201 <a name="freccmake">Frequently-used CMake variables</a>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]202</h3>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]203
204<div class="doc_text">
205
206<p>Here are listed some of the CMake variables that are used often,
207 along with a brief explanation and LLVM-specific notes. For full
208 documentation, check the CMake docs or execute <i>cmake
Oscar Fuentes2cc3ce02008-12-31 14:36:41 +0000[diff] [blame]209 --help-variable VARIABLE_NAME</i>.</p>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]210
211<dl>
212 <dt><b>CMAKE_BUILD_TYPE</b>:STRING</dt>
213
214 <dd>Sets the build type for <i>make</i> based generators. Possible
Oscar Fuentes45f99d62009-10-21 13:22:20 +0000[diff] [blame]215 values are Release, Debug, RelWithDebInfo and MinSizeRel. On
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]216 systems like Visual Studio the user sets the build type with the IDE
217 settings.</dd>
218
219 <dt><b>CMAKE_INSTALL_PREFIX</b>:PATH</dt>
220 <dd>Path where LLVM will be installed if "make install" is invoked
221 or the "INSTALL" target is built.</dd>
222
Oscar Fuentes46fed3b2009-06-12 02:49:53 +0000[diff] [blame]223 <dt><b>LLVM_LIBDIR_SUFFIX</b>:STRING</dt>
224 <dd>Extra suffix to append to the directory where libraries are to
225 be installed. On a 64-bit architecture, one could use
226 -DLLVM_LIBDIR_SUFFIX=64 to install libraries to /usr/lib64.</dd>
227
Oscar Fuentes669db412008-11-25 04:23:36 +0000[diff] [blame]228 <dt><b>CMAKE_C_FLAGS</b>:STRING</dt>
229 <dd>Extra flags to use when compiling C source files.</dd>
230
231 <dt><b>CMAKE_CXX_FLAGS</b>:STRING</dt>
232 <dd>Extra flags to use when compiling C++ source files.</dd>
233
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]234 <dt><b>BUILD_SHARED_LIBS</b>:BOOL</dt>
235 <dd>Flag indicating is shared libraries will be built. Its default
236 value is OFF. Shared libraries are not supported on Windows and
237 not recommended in the other OSes.</dd>
238</dl>
239
240</div>
241
242<!-- ======================================================================= -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]243<h3>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]244 <a name="llvmvars">LLVM-specific variables</a>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]245</h3>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]246
247<div class="doc_text">
248
249<dl>
250 <dt><b>LLVM_TARGETS_TO_BUILD</b>:STRING</dt>
251 <dd>Semicolon-separated list of targets to build, or <i>all</i> for
252 building all targets. Case-sensitive. For Visual C++ defaults
253 to <i>X86</i>. On the other cases defaults to <i>all</i>. Example:
254 <i>-DLLVM_TARGETS_TO_BUILD="X86;PowerPC;Alpha"</i>.</dd>
255
Oscar Fuentesacfd9ad2009-08-16 20:56:30 +0000[diff] [blame]256 <dt><b>LLVM_BUILD_TOOLS</b>:BOOL</dt>
Oscar Fuentes0c2443a2009-11-23 00:21:43 +0000[diff] [blame]257 <dd>Build LLVM tools. Defaults to ON. Targets for building each tool
258 are generated in any case. You can build an tool separately by
259 invoking its target. For example, you can build <i>llvm-as</i>
260 with a makefile-based system executing <i>make llvm-as</i> on the
261 root of your build directory.</dd>
Oscar Fuentesacfd9ad2009-08-16 20:56:30 +0000[diff] [blame]262
Oscar Fuentesbf030842010-09-25 20:43:06 +0000[diff] [blame]263 <dt><b>LLVM_INCLUDE_TOOLS</b>:BOOL</dt>
264 <dd>Generate build targets for the LLVM tools. Defaults to
265 ON. You can use that option for disabling the generation of build
266 targets for the LLVM tools.</dd>
267
Oscar Fuentesacfd9ad2009-08-16 20:56:30 +0000[diff] [blame]268 <dt><b>LLVM_BUILD_EXAMPLES</b>:BOOL</dt>
Oscar Fuentes0c2443a2009-11-23 00:21:43 +0000[diff] [blame]269 <dd>Build LLVM examples. Defaults to OFF. Targets for building each
270 example are generated in any case. See documentation
271 for <i>LLVM_BUILD_TOOLS</i> above for more details.</dd>
Oscar Fuentesacfd9ad2009-08-16 20:56:30 +0000[diff] [blame]272
Oscar Fuentesbf030842010-09-25 20:43:06 +0000[diff] [blame]273 <dt><b>LLVM_INCLUDE_EXAMPLES</b>:BOOL</dt>
274 <dd>Generate build targets for the LLVM examples. Defaults to
275 ON. You can use that option for disabling the generation of build
276 targets for the LLVM examples.</dd>
277
Oscar Fuentesb1f93802010-10-28 14:38:35 +0000[diff] [blame]278 <dt><b>LLVM_BUILD_TESTS</b>:BOOL</dt>
279 <dd>Build LLVM unit tests. Defaults to OFF. Targets for building
280 each unit test are generated in any case. You can build a specific
281 unit test with the target <i>UnitTestNameTests</i> (where at this
282 time <i>UnitTestName</i> can be ADT, Analysis, ExecutionEngine,
283 JIT, Support, Transform, VMCore; see the subdirectories
284 of <i>unittests</i> for an updated list.) It is possible to build
285 all unit tests with the target <i>UnitTests</i>.</dd>
286
287 <dt><b>LLVM_INCLUDE_TESTS</b>:BOOL</dt>
288 <dd>Generate build targets for the LLVM unit tests. Defaults to
289 ON. You can use that option for disabling the generation of build
290 targets for the LLVM unit tests.</dd>
291
Oscar Fuentes70640352010-12-20 09:47:13 +0000[diff] [blame]292 <dt><b>LLVM_APPEND_VC_REV</b>:BOOL</dt>
293 <dd>Append version control revision info (svn revision number or git
294 revision id) to LLVM version string (stored in the PACKAGE_VERSION
295 macro). For this to work cmake must be invoked before the
296 build. Defaults to OFF.</dd>
297
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]298 <dt><b>LLVM_ENABLE_THREADS</b>:BOOL</dt>
299 <dd>Build with threads support, if available. Defaults to ON.</dd>
300
Oscar Fuentes208a8732009-06-04 09:26:16 +0000[diff] [blame]301 <dt><b>LLVM_ENABLE_ASSERTIONS</b>:BOOL</dt>
Oscar Fuentes45f99d62009-10-21 13:22:20 +0000[diff] [blame]302 <dd>Enables code assertions. Defaults to OFF if and only if
Oscar Fuentes61338132009-06-03 15:11:25 +0000[diff] [blame]303 CMAKE_BUILD_TYPE is <i>Release</i>.</dd>
304
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]305 <dt><b>LLVM_ENABLE_PIC</b>:BOOL</dt>
Oscar Fuentes6d61f552009-08-18 15:29:35 +0000[diff] [blame]306 <dd>Add the <i>-fPIC</i> flag for the compiler command-line, if the
307 compiler supports this flag. Some systems, like Windows, do not
308 need this flag. Defaults to ON.</dd>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]309
Oscar Fuentes5c600b52009-12-01 02:21:51 +0000[diff] [blame]310 <dt><b>LLVM_ENABLE_WARNINGS</b>:BOOL</dt>
311 <dd>Enable all compiler warnings. Defaults to ON.</dd>
312
313 <dt><b>LLVM_ENABLE_PEDANTIC</b>:BOOL</dt>
314 <dd>Enable pedantic mode. This disable compiler specific extensions, is
315 possible. Defaults to ON.</dd>
316
317 <dt><b>LLVM_ENABLE_WERROR</b>:BOOL</dt>
318 <dd>Stop and fail build, if a compiler warning is
319 triggered. Defaults to OFF.</dd>
320
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]321 <dt><b>LLVM_BUILD_32_BITS</b>:BOOL</dt>
322 <dd>Build 32-bits executables and libraries on 64-bits systems. This
Oscar Fuentes5c600b52009-12-01 02:21:51 +0000[diff] [blame]323 option is available only on some 64-bits unix systems. Defaults to
324 OFF.</dd>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]325
Oscar Fuentesb9a78132009-09-13 22:18:38 +0000[diff] [blame]326 <dt><b>LLVM_TARGET_ARCH</b>:STRING</dt>
327 <dd>LLVM target to use for native code generation. This is required
328 for JIT generation. It defaults to "host", meaning that it shall
329 pick the architecture of the machine where LLVM is being built. If
330 you are cross-compiling, set it to the target architecture
331 name.</dd>
332
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]333 <dt><b>LLVM_TABLEGEN</b>:STRING</dt>
334 <dd>Full path to a native TableGen executable (usually
335 named <i>tblgen</i>). This is intented for cross-compiling: if the
336 user sets this variable, no native TableGen will be created.</dd>
NAKAMURA Takumif7910072010-11-11 04:09:35 +0000[diff] [blame]337
338 <dt><b>LLVM_LIT_ARGS</b>:STRING</dt>
339 <dd>Arguments given to lit.
340 <tt>make check</tt> and <tt>make clang-test</tt> are affected.
341 By default, <tt>&quot;-sv --no-progress-bar&quot;</tt>
342 on Visual C++ and Xcode,
343 <tt>&quot;-sv&quot;</tt> on others.</dd>
Oscar Fuentes64955952011-01-21 15:42:54 +0000[diff] [blame]344
NAKAMURA Takumif214f502011-02-09 04:19:28 +0000[diff] [blame]345 <dt><b>LLVM_LIT_TOOLS_DIR</b>:STRING</dt>
346 <dd>The path to GnuWin32 tools for tests. Valid on Windows host.
347 Defaults to "", then Lit seeks tools according to %PATH%.
NAKAMURA Takumi6bd36d52011-04-09 09:51:57 +0000[diff] [blame]348 Lit can find tools(eg. grep, sort, &amp;c) on LLVM_LIT_TOOLS_DIR at first,
NAKAMURA Takumif214f502011-02-09 04:19:28 +0000[diff] [blame]349 without specifying GnuWin32 to %PATH%.</dd>
350
Oscar Fuentes64955952011-01-21 15:42:54 +0000[diff] [blame]351 <dt><b>LLVM_ENABLE_FFI</b>:BOOL</dt>
352 <dd>Indicates whether LLVM Interpreter will be linked with Foreign
353 Function Interface library. If the library or its headers are
354 installed on a custom location, you can set the variables
355 FFI_INCLUDE_DIR and FFI_LIBRARY_DIR. Defaults to OFF.</dd>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]356</dl>
357
358</div>
359
360<!-- *********************************************************************** -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]361<h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]362 <a name="testing">Executing the test suite</a>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]363</h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]364<!-- *********************************************************************** -->
365
366<div class="doc_text">
367
Oscar Fuentesc9793792010-08-09 02:49:39 +0000[diff] [blame]368<p>Testing is performed when the <i>check</i> target is built. For
369 instance, if you are using makefiles, execute this command while on
370 the top level of your build directory:</p>
Oscar Fuentes50ff1542008-11-20 23:35:09 +0000[diff] [blame]371
Oscar Fuentesc9793792010-08-09 02:49:39 +0000[diff] [blame]372<div class="doc_code">
373 <p><tt>make check</tt></p>
374</div>
375
NAKAMURA Takumif214f502011-02-09 04:19:28 +0000[diff] [blame]376<p>On Visual Studio, you may run tests to build the project "check".</p>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]377
378</div>
379
380<!-- *********************************************************************** -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]381<h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]382 <a name="cross">Cross compiling</a>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]383</h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]384<!-- *********************************************************************** -->
385
386<div class="doc_text">
387
Oscar Fuentes4a899c72009-06-11 04:45:08 +0000[diff] [blame]388<p>See <a href="http://www.vtk.org/Wiki/CMake_Cross_Compiling">this
389 wiki page</a> for generic instructions on how to cross-compile
390 with CMake. It goes into detailed explanations and may seem
391 daunting, but it is not. On the wiki page there are several
392 examples including toolchain files. Go directly to
393 <a href="http://www.vtk.org/Wiki/CMake_Cross_Compiling#Information_how_to_set_up_various_cross_compiling_toolchains">this
394 section</a> for a quick solution.</p>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]395
Oscar Fuentesb9a78132009-09-13 22:18:38 +0000[diff] [blame]396<p>Also see the <a href="#llvmvars">LLVM-specific variables</a>
397 section for variables used when cross-compiling.</p>
398
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]399</div>
400
401<!-- *********************************************************************** -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]402<h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]403 <a name="embedding">Embedding LLVM in your project</a>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]404</h2>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]405<!-- *********************************************************************** -->
406
407<div class="doc_text">
408
Oscar Fuentes43c63212010-08-09 03:26:48 +0000[diff] [blame]409 <p>The most difficult part of adding LLVM to the build of a project
410 is to determine the set of LLVM libraries corresponding to the set
411 of required LLVM features. What follows is an example of how to
412 obtain this information:</p>
413
414 <div class="doc_code">
415 <pre>
416 <b># A convenience variable:</b>
417 set(LLVM_ROOT "" CACHE PATH "Root of LLVM install.")
418 <b># A bit of a sanity check:</b>
419 if( NOT EXISTS ${LLVM_ROOT}/include/llvm )
420 message(FATAL_ERROR "LLVM_ROOT (${LLVM_ROOT}) is not a valid LLVM install")
421 endif()
422 <b># We incorporate the CMake features provided by LLVM:</b>
423 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${LLVM_ROOT}/share/llvm/cmake")
424 include(LLVM)
425 <b># Now set the header and library paths:</b>
426 include_directories( ${LLVM_ROOT}/include )
427 link_directories( ${LLVM_ROOT}/lib )
428 <b># Let's suppose we want to build a JIT compiler with support for
429 # binary code (no interpreter):</b>
430 llvm_map_components_to_libraries(REQ_LLVM_LIBRARIES jit native)
431 <b># Finally, we link the LLVM libraries to our executable:</b>
432 target_link_libraries(mycompiler ${REQ_LLVM_LIBRARIES})
433 </pre>
434 </div>
435
436 <p>This assumes that LLVM_ROOT points to an install of LLVM. The
437 procedure works too for uninstalled builds although we need to take
438 care to add an <i>include_directories</i> for the location of the
439 headers on the LLVM source directory (if we are building
440 out-of-source.)</p>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]441
Oscar Fuentesdbe99ba2011-04-10 16:17:49 +0000[diff] [blame]442 <p>Alternativaly, you can utilize CMake's <i>find_package</i>
443 functionality. Here is an equivalent variant of snippet shown above:</p>
444
445 <div class="doc_code">
446 <pre>
447 find_package(LLVM)
448
449 if( NOT LLVM_FOUND )
450 message(FATAL_ERROR "LLVM package can't be found. Set CMAKE_PREFIX_PATH variable to LLVM's installation prefix.")
451 endif()
452
453 include_directories( ${LLVM_INCLUDE_DIRS} )
454 link_directories( ${LLVM_LIBRARY_DIRS} )
455
456 llvm_map_components_to_libraries(REQ_LLVM_LIBRARIES jit native)
457
458 target_link_libraries(mycompiler ${REQ_LLVM_LIBRARIES})
459 </pre>
460 </div>
461
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]462</div>
463
Oscar Fuentes23fe31c2011-04-12 19:40:35 +0000[diff] [blame]464<!-- ======================================================================= -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]465<h3>
Oscar Fuentes23fe31c2011-04-12 19:40:35 +0000[diff] [blame]466 <a name="passdev">Developing LLVM pass out of source</a>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]467</h3>
Oscar Fuentes23fe31c2011-04-12 19:40:35 +0000[diff] [blame]468
469<div class="doc_text">
470
471 <p>It is possible to develop LLVM passes against installed LLVM.
472 An example of project layout provided below:</p>
473
474 <div class="doc_code">
475 <pre>
476 &lt;project dir&gt;/
477 |
478 CMakeLists.txt
479 &lt;pass name&gt;/
480 |
481 CMakeLists.txt
482 Pass.cpp
483 ...
484 </pre>
485 </div>
486
487 <p>Contents of &lt;project dir&gt;/CMakeLists.txt:</p>
488
489 <div class="doc_code">
490 <pre>
491 find_package(LLVM)
492
493 <b># Define add_llvm_* macro's.</b>
494 include(AddLLVM)
495
496 add_definitions(${LLVM_DEFINITIONS})
497 include_directories(${LLVM_INCLUDE_DIRS})
498 link_directories(${LLVM_LIBRARY_DIRS})
499
500 add_subdirectory(&lt;pass name&gt;)
501 </pre>
502 </div>
503
504 <p>Contents of &lt;project dir&gt;/&lt;pass name&gt;/CMakeLists.txt:</p>
505
506 <div class="doc_code">
507 <pre>
508 add_llvm_loadable_module(LLVMPassname
509 Pass.cpp
510 )
511 </pre>
512 </div>
513
514 <p>When you are done developing your pass, you may wish to integrate it
515 into LLVM source tree. You can achieve it in two easy steps:<br>
516 1. Copying &lt;pass name&gt; folder into &lt;LLVM root&gt;/lib/Transform directory.<br>
517 2. Adding "add_subdirectory(&lt;pass name&gt;)" line into &lt;LLVM root&gt;/lib/Transform/CMakeLists.txt</p>
518</div>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]519<!-- *********************************************************************** -->
520
Oscar Fuentes2cc3ce02008-12-31 14:36:41 +0000[diff] [blame]521<!-- *********************************************************************** -->
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]522<h2>
Oscar Fuentes2cc3ce02008-12-31 14:36:41 +0000[diff] [blame]523 <a name="specifics">Compiler/Platform specific topics</a>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]524</h2>
Oscar Fuentes2cc3ce02008-12-31 14:36:41 +0000[diff] [blame]525<!-- *********************************************************************** -->
526
527<div class="doc_text">
528
529<p>Notes for specific compilers and/or platforms.</p>
530
531</div>
532
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]533<h3>
Oscar Fuentes318c3f12011-03-02 17:47:37 +0000[diff] [blame]534 <a name="msvc">Microsoft Visual C++</a>
NAKAMURA Takumifc8d9302011-04-18 23:59:50 +0000[diff] [blame^]535</h3>
Oscar Fuentes318c3f12011-03-02 17:47:37 +0000[diff] [blame]536
537<div class="doc_text">
538
539<dl>
540 <dt><b>LLVM_COMPILER_JOBS</b>:STRING</dt>
541 <dd>Specifies the maximum number of parallell compiler jobs to use
542 per project when building with msbuild or Visual Studio. Only supported for
543 Visual Studio 2008 and Visual Studio 2010 CMake generators. 0 means use all
544 processors. Default is 0.</dd>
545</dl>
546
547</div>
548
Oscar Fuentes2cc3ce02008-12-31 14:36:41 +0000[diff] [blame]549<!-- *********************************************************************** -->
550
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]551<hr>
552<address>
553 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman86242e12008-12-11 17:34:48 +0000[diff] [blame]554 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]555 <a href="http://validator.w3.org/check/referer"><img
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Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]557
Oscar Fuentes50ff1542008-11-20 23:35:09 +0000[diff] [blame]558 <a href="mailto:ofv@wanadoo.es">Oscar Fuentes</a><br>
NAKAMURA Takumica46f5a2011-04-09 02:13:37 +0000[diff] [blame]559 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Oscar Fuentes43c63212010-08-09 03:26:48 +0000[diff] [blame]560 Last modified: $Date: 2010-08-09 03:59:36 +0100 (Mon, 9 Aug 2010) $
Oscar Fuentes8395ac92008-11-20 22:05:48 +0000[diff] [blame]561</address>
562
563</body>
564</html>