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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>Building LLVM with CMake</title>
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<link rel="stylesheet" href="llvm.css" type="text/css">
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</head>
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<div class="doc_title">
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Building LLVM with CMake
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</div>
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<ul>
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<li><a href="#intro">Introduction</a></li>
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<li><a href="#quickstart">Quick start</a></li>
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<li><a href="#usage">Basic CMake usage</a>
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<li><a href="#options">Options and variables</a>
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<ul>
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<li><a href="#freccmake">Frequently-used CMake variables</a></li>
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<li><a href="#llvmvars">LLVM-specific variables</a></li>
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</ul></li>
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<li><a href="#testing">Executing the test suite</a>
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<li><a href="#cross">Cross compiling</a>
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<li><a href="#embedding">Embedding LLVM in your project</a>
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<li><a href="#specifics">Compiler/Platform specific topics</a>
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<ul>
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<li><a href="#msvc">Microsoft Visual C++</a></li>
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</ul></li>
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</ul>
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<div class="doc_author">
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<p>Written by <a href="mailto:ofv@wanadoo.es">Oscar Fuentes</a></p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="intro">Introduction</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p><a href="http://www.cmake.org/">CMake</a> is a cross-platform
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build-generator tool. CMake does not build the project, it generates
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the files needed by your build tool (GNU make, Visual Studio, etc) for
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building LLVM.</p>
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<p>If you are really anxious about getting a functional LLVM build,
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go to the <a href="#quickstart">Quick start</a> section. If you
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are a CMake novice, start on <a href="#usage">Basic CMake
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usage</a> and then go back to the <a href="#quickstart">Quick
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start</a> once you know what you are
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doing. The <a href="#options">Options and variables</a> section
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is a reference for customizing your build. If you already have
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experience with CMake, this is the recommended starting point.
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="quickstart">Quick start</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p> We use here the command-line, non-interactive CMake interface </p>
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<ol>
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<li><p><a href="http://www.cmake.org/cmake/resources/software.html">Download</a>
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and install CMake. Version 2.6.2 is the minimum required.</p>
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<li><p>Open a shell. Your development tools must be reachable from this
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shell through the PATH environment variable.</p>
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<li><p>Create a directory for containing the build. It is not
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supported to build LLVM on the source directory. cd to this
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directory:</p>
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<div class="doc_code">
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<p><tt>mkdir mybuilddir</tt></p>
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<p><tt>cd mybuilddir</tt></p>
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</div>
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<li><p>Execute this command on the shell
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replacing <i>path/to/llvm/source/root</i> with the path to the
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root of your LLVM source tree:</p>
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<div class="doc_code">
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<p><tt>cmake path/to/llvm/source/root</tt></p>
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</div>
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<p>CMake will detect your development environment, perform a
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series of test and generate the files required for building
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LLVM. CMake will use default values for all build
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parameters. See the <a href="#options">Options and variables</a>
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section for fine-tuning your build</p>
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<p>This can fail if CMake can't detect your toolset, or if it
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thinks that the environment is not sane enough. On this case
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make sure that the toolset that you intend to use is the only
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one reachable from the shell and that the shell itself is the
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correct one for you development environment. CMake will refuse
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to build MinGW makefiles if you have a POSIX shell reachable
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through the PATH environment variable, for instance. You can
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force CMake to use a given build tool, see
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the <a href="#usage">Usage</a> section.</p>
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</ol>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="usage">Basic CMake usage</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>This section explains basic aspects of CMake, mostly for
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explaining those options which you may need on your day-to-day
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usage.</p>
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<p>CMake comes with extensive documentation in the form of html
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files and on the cmake executable itself. Execute <i>cmake
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--help</i> for further help options.</p>
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<p>CMake requires to know for which build tool it shall generate
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files (GNU make, Visual Studio, Xcode, etc). If not specified on
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the command line, it tries to guess it based on you
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environment. Once identified the build tool, CMake uses the
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corresponding <i>Generator</i> for creating files for your build
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tool. You can explicitly specify the generator with the command
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line option <i>-G "Name of the generator"</i>. For knowing the
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available generators on your platform, execute</p>
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<div class="doc_code">
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<p><tt>cmake --help</tt></p>
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</div>
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<p>This will list the generator's names at the end of the help
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text. Generator's names are case-sensitive. Example:</p>
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<div class="doc_code">
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<p><tt>cmake -G "Visual Studio 8 2005" path/to/llvm/source/root</tt></p>
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</div>
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<p>For a given development platform there can be more than one
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adequate generator. If you use Visual Studio "NMake Makefiles"
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is a generator you can use for building with NMake. By default,
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CMake chooses the more specific generator supported by your
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development environment. If you want an alternative generator,
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you must tell this to CMake with the <i>-G</i> option.</p>
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<p>TODO: explain variables and cache. Move explanation here from
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#options section.</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="options">Options and variables</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>Variables customize how the build will be generated. Options are
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boolean variables, with possible values ON/OFF. Options and
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variables are defined on the CMake command line like this:</p>
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<div class="doc_code">
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<p><tt>cmake -DVARIABLE=value path/to/llvm/source</tt></p>
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</div>
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<p>You can set a variable after the initial CMake invocation for
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changing its value. You can also undefine a variable:</p>
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<div class="doc_code">
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<p><tt>cmake -UVARIABLE path/to/llvm/source</tt></p>
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</div>
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<p>Variables are stored on the CMake cache. This is a file
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named <tt>CMakeCache.txt</tt> on the root of the build
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directory. Do not hand-edit it.</p>
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<p>Variables are listed here appending its type after a colon. It is
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correct to write the variable and the type on the CMake command
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line:</p>
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<div class="doc_code">
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<p><tt>cmake -DVARIABLE:TYPE=value path/to/llvm/source</tt></p>
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</div>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection">
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<a name="freccmake">Frequently-used CMake variables</a>
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</div>
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<div class="doc_text">
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<p>Here are listed some of the CMake variables that are used often,
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along with a brief explanation and LLVM-specific notes. For full
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documentation, check the CMake docs or execute <i>cmake
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--help-variable VARIABLE_NAME</i>.</p>
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<dl>
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<dt><b>CMAKE_BUILD_TYPE</b>:STRING</dt>
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<dd>Sets the build type for <i>make</i> based generators. Possible
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values are Release, Debug, RelWithDebInfo and MinSizeRel. On
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systems like Visual Studio the user sets the build type with the IDE
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settings.</dd>
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<dt><b>CMAKE_INSTALL_PREFIX</b>:PATH</dt>
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<dd>Path where LLVM will be installed if "make install" is invoked
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or the "INSTALL" target is built.</dd>
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<dt><b>LLVM_LIBDIR_SUFFIX</b>:STRING</dt>
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<dd>Extra suffix to append to the directory where libraries are to
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be installed. On a 64-bit architecture, one could use
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-DLLVM_LIBDIR_SUFFIX=64 to install libraries to /usr/lib64.</dd>
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<dt><b>CMAKE_C_FLAGS</b>:STRING</dt>
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<dd>Extra flags to use when compiling C source files.</dd>
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<dt><b>CMAKE_CXX_FLAGS</b>:STRING</dt>
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<dd>Extra flags to use when compiling C++ source files.</dd>
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<dt><b>BUILD_SHARED_LIBS</b>:BOOL</dt>
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<dd>Flag indicating is shared libraries will be built. Its default
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value is OFF. Shared libraries are not supported on Windows and
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not recommended in the other OSes.</dd>
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</dl>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection">
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<a name="llvmvars">LLVM-specific variables</a>
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</div>
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<div class="doc_text">
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<dl>
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<dt><b>LLVM_TARGETS_TO_BUILD</b>:STRING</dt>
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<dd>Semicolon-separated list of targets to build, or <i>all</i> for
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building all targets. Case-sensitive. For Visual C++ defaults
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to <i>X86</i>. On the other cases defaults to <i>all</i>. Example:
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<i>-DLLVM_TARGETS_TO_BUILD="X86;PowerPC;Alpha"</i>.</dd>
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<dt><b>LLVM_BUILD_TOOLS</b>:BOOL</dt>
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<dd>Build LLVM tools. Defaults to ON. Targets for building each tool
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are generated in any case. You can build an tool separately by
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invoking its target. For example, you can build <i>llvm-as</i>
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with a makefile-based system executing <i>make llvm-as</i> on the
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root of your build directory.</dd>
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<dt><b>LLVM_BUILD_EXAMPLES</b>:BOOL</dt>
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<dd>Build LLVM examples. Defaults to OFF. Targets for building each
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example are generated in any case. See documentation
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for <i>LLVM_BUILD_TOOLS</i> above for more details.</dd>
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<dt><b>LLVM_ENABLE_THREADS</b>:BOOL</dt>
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<dd>Build with threads support, if available. Defaults to ON.</dd>
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<dt><b>LLVM_ENABLE_ASSERTIONS</b>:BOOL</dt>
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<dd>Enables code assertions. Defaults to OFF if and only if
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CMAKE_BUILD_TYPE is <i>Release</i>.</dd>
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<dt><b>LLVM_ENABLE_PIC</b>:BOOL</dt>
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<dd>Add the <i>-fPIC</i> flag for the compiler command-line, if the
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compiler supports this flag. Some systems, like Windows, do not
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need this flag. Defaults to ON.</dd>
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<dt><b>LLVM_ENABLE_WARNINGS</b>:BOOL</dt>
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<dd>Enable all compiler warnings. Defaults to ON.</dd>
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<dt><b>LLVM_ENABLE_PEDANTIC</b>:BOOL</dt>
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<dd>Enable pedantic mode. This disable compiler specific extensions, is
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possible. Defaults to ON.</dd>
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<dt><b>LLVM_ENABLE_WERROR</b>:BOOL</dt>
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<dd>Stop and fail build, if a compiler warning is
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triggered. Defaults to OFF.</dd>
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<dt><b>LLVM_BUILD_32_BITS</b>:BOOL</dt>
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<dd>Build 32-bits executables and libraries on 64-bits systems. This
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option is available only on some 64-bits unix systems. Defaults to
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OFF.</dd>
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<dt><b>LLVM_TARGET_ARCH</b>:STRING</dt>
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<dd>LLVM target to use for native code generation. This is required
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for JIT generation. It defaults to "host", meaning that it shall
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pick the architecture of the machine where LLVM is being built. If
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you are cross-compiling, set it to the target architecture
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name.</dd>
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<dt><b>LLVM_TABLEGEN</b>:STRING</dt>
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<dd>Full path to a native TableGen executable (usually
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named <i>tblgen</i>). This is intented for cross-compiling: if the
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user sets this variable, no native TableGen will be created.</dd>
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</dl>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="testing">Executing the test suite</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>Testing is performed when the <i>check</i> target is built. For
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instance, if you are using makefiles, execute this command while on
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the top level of your build directory:</p>
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<div class="doc_code">
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<p><tt>make check</tt></p>
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</div>
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<p>Testing is not supported on Visual Studio.</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="cross">Cross compiling</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>See <a href="http://www.vtk.org/Wiki/CMake_Cross_Compiling">this
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wiki page</a> for generic instructions on how to cross-compile
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with CMake. It goes into detailed explanations and may seem
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daunting, but it is not. On the wiki page there are several
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examples including toolchain files. Go directly to
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<a href="http://www.vtk.org/Wiki/CMake_Cross_Compiling#Information_how_to_set_up_various_cross_compiling_toolchains">this
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section</a> for a quick solution.</p>
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<p>Also see the <a href="#llvmvars">LLVM-specific variables</a>
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section for variables used when cross-compiling.</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="embedding">Embedding LLVM in your project</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>The most difficult part of adding LLVM to the build of a project
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is to determine the set of LLVM libraries corresponding to the set
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of required LLVM features. What follows is an example of how to
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obtain this information:</p>
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<div class="doc_code">
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<pre>
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<b># A convenience variable:</b>
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set(LLVM_ROOT "" CACHE PATH "Root of LLVM install.")
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<b># A bit of a sanity check:</b>
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if( NOT EXISTS ${LLVM_ROOT}/include/llvm )
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message(FATAL_ERROR "LLVM_ROOT (${LLVM_ROOT}) is not a valid LLVM install")
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endif()
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<b># We incorporate the CMake features provided by LLVM:</b>
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set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${LLVM_ROOT}/share/llvm/cmake")
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include(LLVM)
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<b># Now set the header and library paths:</b>
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include_directories( ${LLVM_ROOT}/include )
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link_directories( ${LLVM_ROOT}/lib )
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<b># Let's suppose we want to build a JIT compiler with support for
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# binary code (no interpreter):</b>
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llvm_map_components_to_libraries(REQ_LLVM_LIBRARIES jit native)
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<b># Finally, we link the LLVM libraries to our executable:</b>
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target_link_libraries(mycompiler ${REQ_LLVM_LIBRARIES})
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</pre>
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</div>
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<p>This assumes that LLVM_ROOT points to an install of LLVM. The
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procedure works too for uninstalled builds although we need to take
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care to add an <i>include_directories</i> for the location of the
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headers on the LLVM source directory (if we are building
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out-of-source.)</p>
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</div>
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<!-- *********************************************************************** -->
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="specifics">Compiler/Platform specific topics</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>Notes for specific compilers and/or platforms.</p>
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</div>
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<!-- *********************************************************************** -->
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<hr>
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<address>
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<a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
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<a href="http://validator.w3.org/check/referer"><img
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src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
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<a href="mailto:ofv@wanadoo.es">Oscar Fuentes</a><br>
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<a href="http://llvm.org">LLVM Compiler Infrastructure</a><br>
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Last modified: $Date: 2010-08-09 03:59:36 +0100 (Mon, 9 Aug 2010) $
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</address>
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</body>
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</html>
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