mirror of
https://github.com/RPCSX/llvm.git
synced 2024-11-24 20:29:53 +00:00
784a176bc3
revision id is appended to the LLVM version string. Defaults to OFF. Until now the VC revision id was always appended to the revision string whenever cmake was invoked (either explicitly or implicitly because a cmake source file changed). This was causing massive recompilations because config.h are reconfigured with the new contents of PACKAGE_VERSION. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122240 91177308-0d34-0410-b5e6-96231b3b80d8
459 lines
17 KiB
HTML
459 lines
17 KiB
HTML
<!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 2.8 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_INCLUDE_TOOLS</b>:BOOL</dt>
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<dd>Generate build targets for the LLVM tools. Defaults to
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ON. You can use that option for disabling the generation of build
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targets for the LLVM tools.</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_INCLUDE_EXAMPLES</b>:BOOL</dt>
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<dd>Generate build targets for the LLVM examples. Defaults to
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ON. You can use that option for disabling the generation of build
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targets for the LLVM examples.</dd>
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<dt><b>LLVM_BUILD_TESTS</b>:BOOL</dt>
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<dd>Build LLVM unit tests. Defaults to OFF. Targets for building
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each unit test are generated in any case. You can build a specific
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unit test with the target <i>UnitTestNameTests</i> (where at this
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time <i>UnitTestName</i> can be ADT, Analysis, ExecutionEngine,
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JIT, Support, Transform, VMCore; see the subdirectories
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of <i>unittests</i> for an updated list.) It is possible to build
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all unit tests with the target <i>UnitTests</i>.</dd>
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<dt><b>LLVM_INCLUDE_TESTS</b>:BOOL</dt>
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<dd>Generate build targets for the LLVM unit tests. Defaults to
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ON. You can use that option for disabling the generation of build
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targets for the LLVM unit tests.</dd>
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<dt><b>LLVM_APPEND_VC_REV</b>:BOOL</dt>
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<dd>Append version control revision info (svn revision number or git
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revision id) to LLVM version string (stored in the PACKAGE_VERSION
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macro). For this to work cmake must be invoked before the
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build. Defaults to OFF.</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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<dt><b>LLVM_LIT_ARGS</b>:STRING</dt>
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<dd>Arguments given to lit.
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<tt>make check</tt> and <tt>make clang-test</tt> are affected.
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By default, <tt>"-sv --no-progress-bar"</tt>
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on Visual C++ and Xcode,
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<tt>"-sv"</tt> on others.</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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