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authorOscar Fuentes <ofv@wanadoo.es>2008-11-20 22:05:48 +0000
committerOscar Fuentes <ofv@wanadoo.es>2008-11-20 22:05:48 +0000
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CMake: Some documentation. Work in progress.
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
+ "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+ <title>Building LLVM with CMake</title>
+ <link rel="stylesheet" href="llvm.css" type="text/css">
+</head>
+
+<div class="doc_title">
+ Building LLVM with CMake
+</div>
+
+<ul>
+ <li><a href="#intro">Introduction</a></li>
+ <li><a href="#quickstart">Quick start</a></li>
+ <li><a href="#usage">Basic CMake usage</a>
+ <li><a href="#options">Options and variables</a>
+ <ul>
+ <li><a href="#freccmake">Frequently-used CMake variables</a></li>
+ <li><a href="#llvmvars">LLVM-specific variables</a></li>
+ </ul></li>
+ <li><a href="#testing">Executing the test suite</a>
+ <li><a href="#cross">Cross compiling</a>
+ <li><a href="#embedding">Embedding LLVM in your project</a>
+</ul>
+
+<div class="doc_author">
+<p>Written by <a href="mailto:ofv@wanadoo.es">Óscar Fuentes</a></p>
+</div>
+
+<!-- *********************************************************************** -->
+<div class="doc_section">
+<a name="intro">Introduction</a>
+</div>
+<!-- *********************************************************************** -->
+
+<div class="doc_text">
+
+ <p><a href="http://www.cmake.org/">CMake</a> is a cross-platform
+ build-generator tool. CMake does not build the project, it generates
+ the files needed by your build tool (GNU make, Visual Studio, etc) for
+ building LLVM.</p>
+
+ <p>If you are really anxious
+</div>
+
+<!-- *********************************************************************** -->
+<div class="doc_section">
+<a name="quickstart">Quick start</a>
+</div>
+<!-- *********************************************************************** -->
+
+<div class="doc_text">
+
+<p> We use here the command-line, non-interactive CMake interface </p>
+
+<ol>
+
+ <li><p><a href=http://www.cmake.org/cmake/resources/software.html>Download</a>
+ and install CMake. Version 2.6.2 is the minimum required.</p>
+
+ <li><p>Open a shell. Your development tools must be reachable from this
+ shell through the PATH environment variable.</p>
+
+ <li><p>Create a directory for containing the build. It is not
+ supported to build LLVM on the source directory. cd to this
+ directory:</p>
+ <div class="doc_code">
+ <p><tt>mkdir mybuilddir</tt></p>
+ <p><tt>cd mybuilddir</tt></p>
+ </div>
+
+ <li><p>Execute this command on the shell
+ replacing <i>path/to/llvm/source/root</i> with the path to the
+ root of your LLVM source tree:</p>
+ <div class="doc_code">
+ <p><tt>cmake path/to/llvm/source/root</tt></p>
+ </div>
+
+ <p>CMake will detect your development environment, perform a
+ series of test and generate the files required for building
+ LLVM. CMake will use default values for all build
+ parameters. See the <a href="#options">Options and variables</a>
+ section for fine-tuning your build</p>
+
+ <p>This can fail if CMake can't detect your toolset, or if it
+ thinks that the environment is not sane enough. On this case
+ make sure that the toolset that you intend to use is the only
+ one reachable from the shell and that the shell itself is the
+ correct one for you development environment. CMake will refuse
+ to build MinGW makefiles if you have a POSIX shell reachable
+ through the PATH environment variable, for instance. You can
+ force CMake to use a given build tool, see
+ the <a href="#usage">Usage</a> section.</p>
+
+</ol>
+
+</div>
+
+<!-- *********************************************************************** -->
+<div class="doc_section">
+ <a name="usage">Basic CMake usage</a>
+</div>
+<!-- *********************************************************************** -->
+
+<div class="doc_text">
+
+<p>TODO</p>
+
+</div>
+
+<!-- *********************************************************************** -->
+<div class="doc_section">
+ <a name="options">Options and variables</a>
+</div>
+<!-- *********************************************************************** -->
+
+<div class="doc_text">
+
+ <p>Variables customize how the build will be generated. Options are
+ boolean variables, with possible values ON/OFF. Options and
+ variables are defined on the CMake command line like this:</p>
+
+ <div class="doc_code">
+ <p><tt>cmake -DVARIABLE=value path/to/llvm/source</tt></p>
+ </div>
+
+ <p>You can set a variable after the initial CMake invocation for
+ changing its value. You can also undefine a variable:</p>
+
+ <div class="doc_code">
+ <p><tt>cmake -UVARIABLE path/to/llvm/source</tt></p>
+ </div>
+
+ <p>Variables are stored on the CMake cache. This is a file
+ named <it>CMakeCache.txt</it> on the root of the build
+ directory. Do not hand-edit it.</p>
+
+ <p>Variables are listed here appending its type after a colon. It is
+ correct to write the variable and the type on the CMake command
+ line:</p>
+
+ <div class="doc_code">
+ <p><tt>cmake -DVARIABLE:TYPE=value path/to/llvm/source</tt></p>
+ </div>
+
+</div>
+
+<!-- ======================================================================= -->
+<div class="doc_subsection">
+ <a name="freccmake">Frequently-used CMake variables</a>
+</div>
+
+<div class="doc_text">
+
+<p>Here are listed some of the CMake variables that are used often,
+ along with a brief explanation and LLVM-specific notes. For full
+ documentation, check the CMake docs or execute <i>cmake
+ --help-variable VARIABLE_NAME</i>.
+
+<dl>
+ <dt><b>CMAKE_BUILD_TYPE</b>:STRING</dt>
+
+ <dd>Sets the build type for <i>make</i> based generators. Possible
+ values are Release, Debug, RelWithDebInfo and MiniSizeRel. On
+ systems like Visual Studio the user sets the build type with the IDE
+ settings.</dd>
+
+ <dt><b>CMAKE_INSTALL_PREFIX</b>:PATH</dt>
+ <dd>Path where LLVM will be installed if "make install" is invoked
+ or the "INSTALL" target is built.</dd>
+
+ <dt><b>BUILD_SHARED_LIBS</b>:BOOL</dt>
+ <dd>Flag indicating is shared libraries will be built. Its default
+ value is OFF. Shared libraries are not supported on Windows and
+ not recommended in the other OSes.</dd>
+</dl>
+
+</div>
+
+<!-- ======================================================================= -->
+<div class="doc_subsection">
+ <a name="llvmvars">LLVM-specific variables</a>
+</div>
+
+<div class="doc_text">
+
+<dl>
+ <dt><b>LLVM_TARGETS_TO_BUILD</b>:STRING</dt>
+ <dd>Semicolon-separated list of targets to build, or <i>all</i> for
+ building all targets. Case-sensitive. For Visual C++ defaults
+ to <i>X86</i>. On the other cases defaults to <i>all</i>. Example:
+ <i>-DLLVM_TARGETS_TO_BUILD="X86;PowerPC;Alpha"</i>.</dd>
+
+ <dt><b>LLVM_ENABLE_THREADS</b>:BOOL</dt>
+ <dd>Build with threads support, if available. Defaults to ON.</dd>
+
+ <dt><b>LLVM_ENABLE_PIC</b>:BOOL</dt>
+ <dd>Add the <i>-fPIC</i> flag to the compiler command-line, if the
+ compiler supports this flag. Some systems, like Windows, does not
+ need this flag. Defaults to OFF.</dd>
+
+ <dt><b>LLVM_BUILD_32_BITS</b>:BOOL</dt>
+ <dd>Build 32-bits executables and libraries on 64-bits systems. This
+ option is available only on some 64-bits unix systems. Defaults to
+ OFF.</dd>
+
+ <dt><b>LLVM_PLO_FLAGS</b>:STRING</dt>
+ <dd>Extra flags for creating partially linked objects. Visual C++
+ does not use this.</dd>
+
+ <dt><b>LLVM_TABLEGEN</b>:STRING</dt>
+ <dd>Full path to a native TableGen executable (usually
+ named <i>tblgen</i>). This is intented for cross-compiling: if the
+ user sets this variable, no native TableGen will be created.</dd>
+</dl>
+
+</div>
+
+<!-- *********************************************************************** -->
+<div class="doc_section">
+ <a name="testing">Executing the test suite</a>
+</div>
+<!-- *********************************************************************** -->
+
+<div class="doc_text">
+
+<p>TODO</p>
+
+</div>
+
+<!-- *********************************************************************** -->
+<div class="doc_section">
+ <a name="cross">Cross compiling</a>
+</div>
+<!-- *********************************************************************** -->
+
+<div class="doc_text">
+
+<p>TODO</p>
+
+</div>
+
+<!-- *********************************************************************** -->
+<div class="doc_section">
+ <a name="embedding">Embedding LLVM in your project</a>
+</div>
+<!-- *********************************************************************** -->
+
+<div class="doc_text">
+
+<p>TODO</p>
+
+</div>
+
+<!-- *********************************************************************** -->
+
+<hr>
+<address>
+ <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
+ src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+ <a href="http://validator.w3.org/check/referer"><img
+ src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
+
+ <a href="mailto:ofv@wanadoo.es">Óscar Fuentes</a><br>
+ <a href="http://llvm.org">LLVM Compiler Infrastructure</a><br>
+ Last modified: $Date: 2008-10-27 00:59:36 +0100 (Mon, 27 Oct 2008) $
+</address>
+
+</body>
+</html>
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