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| The <strong>LLDB</strong> Debugger | |
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| <h1 class ="postheader">Building LLDB on Mac OS X</h1> | |
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| <p>Building on Mac OS X is as easy as downloading the code and building the Xcode project or workspace:</p> | |
| <ul> | |
| <li><a href="download.html">Download</a> the lldb sources.</li> | |
| <li>Follow the code signing instructions in <b>lldb/docs/code-signing.txt</b></li> | |
| <li>In Xcode 3.x: <b>lldb/lldb.xcodeproj</b>, select the <b>lldb-tool</b> target, and build.</li> | |
| <li>In Xcode 4.x: <b>lldb/lldb.xcworkspace</b>, select the <b>lldb-tool</b> scheme, and build.</li> | |
| </ul> | |
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| <h1 class ="postheader">Building LLDB on Linux</h1> | |
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| <p>This document describes the steps needed to compile LLDB on most Linux systems.</a></p> | |
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| <h2>Preliminaries</h2> | |
| <p>LLDB relies on many of the technologies developed by the larger LLVM project. | |
| In particular, it requires both Clang and LLVM itself in order to build. Due to | |
| this tight integration the <em>Getting Started</em> guides for both of these projects | |
| come as prerequisite reading:</p> | |
| <ul> | |
| <li><a href="http://llvm.org/docs/GettingStarted.html">LLVM</a></li> | |
| <li><a href="http://clang.llvm.org/get_started.html">Clang</a></li> | |
| </ul> | |
| <p>In addition to any dependencies required by LLVM and Clang, LLDB needs a few | |
| development packages that may also need to be installed depending on your | |
| system. The current list of dependencies are:</p> | |
| <ul> | |
| <li><a href="http://swig.org">Swig</a></li> | |
| <li><a href="http://www.thrysoee.dk/editline">libedit</a></li> | |
| <li><a href="http://www.python.org">Python</a></li> | |
| </ul> | |
| <p>So for example, on a Fedora system one might say:</p> | |
| <code>> yum install swig python-devel libedit-devel</code> | |
| <h2 >Building LLDB</h2> | |
| <p>We first need to checkout the source trees into the appropriate locations. Both | |
| Clang and LLDB build as subprojects of LLVM. This means we will be checking out | |
| the source for both Clang and LLDB into the <tt>tools</tt> subdirectory of LLVM. We | |
| will be setting up a directory hierarchy looking something like this:</p> | |
| <p> | |
| <pre><tt> | |
| llvm | |
| | | |
| `-- tools | |
| | | |
| +-- clang | |
| | | |
| `-- lldb | |
| </tt></pre> | |
| </p> | |
| <p>For reference, we will call the root of the LLVM project tree <tt>$llvm</tt>, and the | |
| roots of the Clang and LLDB source trees <tt>$clang</tt> and <tt>$lldb</tt> respectively.</p> | |
| <p>Change to the directory where you want to do development work and checkout LLVM:</p> | |
| <code>> svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm</code> | |
| <p>Now switch to LLVM’s tools subdirectory and checkout both Clang and LLDB:</p> | |
| <code>> cd $llvm/tools | |
| <br>> svn co http://llvm.org/svn/llvm-project/cfe/trunk clang | |
| <br>> svn co http://llvm.org/svn/llvm-project/lldb/trunk lldb | |
| </code> | |
| <p>In general, LLDB requires specific revisions of both LLVM and Clang in order to | |
| build. This requirement insulates LLDB a bit from the constant development | |
| happening in both of these projects. The required revision can be discovered by | |
| consulting the Perl script <tt>$lldb/scripts/build-llvm.pl</tt> and locating the | |
| <tt>$llvm_revision</tt> variable. At the time of this writing, the required revision | |
| is <tt>r127682</tt>, so we might check and revert our LLVM and Clang trees to the | |
| required state as follows:</p> | |
| <code>> grep -m 1 llvm_revision $lldb/scripts/build-llvm.pl | |
| <br>our $llvm_revision = "127682"; | |
| <br>> cd $clang | |
| <br>> svn update -r 127682 | |
| <br>> cd $llvm | |
| <br>> svn update -r 127682</code> | |
| <p>It is highly recommended that you build the system out of tree. Create a second | |
| build directory and configure the LLVM project tree to your specifications as | |
| outlined in LLVM’s <em>Getting Started Guide</em>. For Linux development the x86 | |
| backend and JIT compiler should be enabled. A typical build procedure might be:</p> | |
| <code>> cd $llvm/.. | |
| <br>> mkdir build | |
| <br>> cd build | |
| <br>> $llvm/configure --enable-targets=x86 --enable-jit | |
| <br>> make</code> | |
| <p>Note that once both LLVM and Clang have been configured and built it is not | |
| necessary to perform a top-level <tt>make</tt> to rebuild changes made only to LLDB. | |
| You can build from the <tt>build/tools/lldb</tt> subdirectory as well.</p> | |
| <h2>Additional Notes</h2> | |
| <p>LLDB has a Python scripting capability and supplies it’s own Python module, | |
| <tt>lldb.py</tt>, built alongside the <tt>lldb</tt> binary. Python needs to know where to | |
| look for this module when LLDB starts up. There are two options available:</p> | |
| <ol class="arabic"> | |
| <li> | |
| <p>Keep a copy of <tt>lldb.py</tt> in the current working directory when starting lldb.</p> | |
| </li> | |
| <li> | |
| <p>Set <tt>PYTHONPATH</tt> to point to the directory holding <tt>lldb.py</tt>.</p> | |
| </li> | |
| </ol> | |
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