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<h2>Section Example</h2> <div> <!-- h2+div is applied --> <p>Section preamble.</p> <h3>Subsection Example</h3> <p> <!-- h3+p is applied --> Subsection body </p> <!-- End of section body --> </div> FIXME: Care H5 better. llvm-svn: 130040
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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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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<link rel="stylesheet" href="llvm.css" type="text/css" media="screen">
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<title>Building the LLVM GCC Front-End</title>
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</head>
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<body>
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<h1>
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Building the LLVM GCC Front-End
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</h1>
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<ol>
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<li><a href="#instructions">Building llvm-gcc from Source</a></li>
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<li><a href="#ada">Building the Ada front-end</a></li>
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<li><a href="#fortran">Building the Fortran front-end</a></li>
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<li><a href="#license">License Information</a></li>
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</ol>
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<div class="doc_author">
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<p>Written by the LLVM Team</p>
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</div>
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<!-- *********************************************************************** -->
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<h2><a name="instructions">Building llvm-gcc from Source</a></h2>
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<!-- *********************************************************************** -->
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<div>
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<p>This section describes how to acquire and build llvm-gcc 4.2, which is based
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on the GCC 4.2.1 front-end. Supported languages are Ada, C, C++, Fortran,
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Objective-C and Objective-C++. Note that the instructions for building these
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front-ends are completely different (and much easier!) than those for building
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llvm-gcc3 in the past.</p>
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<ol>
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<li><p>Retrieve the appropriate llvm-gcc-4.2-<i>version</i>.source.tar.gz
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archive from the <a href="http://llvm.org/releases/">LLVM web
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site</a>.</p>
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<p>It is also possible to download the sources of the llvm-gcc front end
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from a read-only mirror using subversion. To check out the 4.2 code
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for first time use:</p>
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<div class="doc_code">
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<pre>
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svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk <i>dst-directory</i>
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</pre>
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</div>
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<p>After that, the code can be be updated in the destination directory
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using:</p>
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<div class="doc_code">
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<pre>svn update</pre>
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</div>
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<p>The mirror is brought up to date every evening.</p></li>
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<li>Follow the directions in the top-level <tt>README.LLVM</tt> file for
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up-to-date instructions on how to build llvm-gcc. See below for building
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with support for Ada or Fortran.
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</ol>
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</div>
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<!-- *********************************************************************** -->
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<h2><a name="ada">Building the Ada front-end</a></h2>
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<!-- *********************************************************************** -->
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<div>
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<p>Building with support for Ada amounts to following the directions in the
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top-level <tt>README.LLVM</tt> file, adding ",ada" to EXTRALANGS, for example:
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<tt>EXTRALANGS=,ada</tt></p>
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<p>There are some complications however:</p>
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<ol>
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<li><p>The only platform for which the Ada front-end is known to build is
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32 bit intel x86 running linux. It is unlikely to build for other
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systems without some work.</p></li>
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<li><p>The build requires having a compiler that supports Ada, C and C++.
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The Ada front-end is written in Ada so an Ada compiler is needed to
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build it. Compilers known to work with the
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<a href="http://llvm.org/releases/download.html">LLVM 2.7 release</a>
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are <a href="http://gcc.gnu.org/releases.html">gcc-4.2</a> and the
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2005, 2006 and 2007 versions of the
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<a href="http://libre.adacore.com/">GNAT GPL Edition</a>.
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<b>GNAT GPL 2008, gcc-4.3 and later will not work</b>.
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The LLVM parts of llvm-gcc are written in C++ so a C++ compiler is
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needed to build them. The rest of gcc is written in C.
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Some linux distributions provide a version of gcc that supports all
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three languages (the Ada part often comes as an add-on package to
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the rest of gcc). Otherwise it is possible to combine two versions
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of gcc, one that supports Ada and C (such as the
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<a href="http://libre.adacore.com/">2007 GNAT GPL Edition</a>)
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and another which supports C++, see below.</p></li>
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<li><p>Because the Ada front-end is experimental, it is wise to build the
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compiler with checking enabled. This causes it to run much slower, but
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helps catch mistakes in the compiler (please report any problems using
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<a href="http://llvm.org/bugs/">LLVM bugzilla</a>).</p></li>
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<li><p>The Ada front-end <a href="http://llvm.org/PR2007">fails to
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bootstrap</a>, due to lack of LLVM support for
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<tt>setjmp</tt>/<tt>longjmp</tt> style exception handling (used
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internally by the compiler), so you must specify
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<tt>--disable-bootstrap</tt>.</p></li>
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</ol>
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<p>Supposing appropriate compilers are available, llvm-gcc with Ada support can
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be built on an x86-32 linux box using the following recipe:</p>
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<ol>
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<li><p>Download the <a href="http://llvm.org/releases/download.html">LLVM source</a>
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and unpack it:</p>
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<pre class="doc_code">
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wget http://llvm.org/releases/2.7/llvm-2.7.tgz
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tar xzf llvm-2.7.tgz
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mv llvm-2.7 llvm
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</pre>
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<p>or <a href="GettingStarted.html#checkout">check out the
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latest version from subversion</a>:</p>
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<pre class="doc_code">svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm</pre>
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</li>
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<li><p>Download the
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<a href="http://llvm.org/releases/download.html">llvm-gcc-4.2 source</a>
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and unpack it:</p>
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<pre class="doc_code">
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wget http://llvm.org/releases/2.7/llvm-gcc-4.2-2.7.source.tgz
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tar xzf llvm-gcc-4.2-2.7.source.tgz
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mv llvm-gcc-4.2-2.7.source llvm-gcc-4.2
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</pre>
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<p>or <a href="GettingStarted.html#checkout">check out the
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latest version from subversion</a>:</p>
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<pre class="doc_code">
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svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk llvm-gcc-4.2
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</pre>
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</li>
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<li><p>Make a build directory <tt>llvm-objects</tt> for llvm and make it the
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current directory:</p>
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<pre class="doc_code">
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mkdir llvm-objects
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cd llvm-objects
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</pre>
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</li>
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<li><p>Configure LLVM (here it is configured to install into <tt>/usr/local</tt>):</p>
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<pre class="doc_code">
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../llvm/configure --prefix=<b>/usr/local</b> --enable-optimized --enable-assertions
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</pre>
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<p>If you have a multi-compiler setup and the C++ compiler is not the
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default, then you can configure like this:</p>
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<pre class="doc_code">
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CXX=<b>PATH_TO_C++_COMPILER</b> ../llvm/configure --prefix=<b>/usr/local</b> --enable-optimized --enable-assertions
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</pre>
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<p>To compile without checking (not recommended), replace
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<tt>--enable-assertions</tt> with <tt>--disable-assertions</tt>.</p>
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</li>
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<li><p>Build LLVM:</p>
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<pre class="doc_code">
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make
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</pre>
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</li>
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<li><p>Install LLVM (optional):</p>
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<pre class="doc_code">
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make install
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</pre>
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</li>
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<li><p>Make a build directory <tt>llvm-gcc-4.2-objects</tt> for llvm-gcc and make it the
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current directory:</p>
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<pre class="doc_code">
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cd ..
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mkdir llvm-gcc-4.2-objects
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cd llvm-gcc-4.2-objects
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</pre>
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</li>
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<li><p>Configure llvm-gcc (here it is configured to install into <tt>/usr/local</tt>).
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The <tt>--enable-checking</tt> flag turns on sanity checks inside the compiler.
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To turn off these checks (not recommended), replace <tt>--enable-checking</tt>
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with <tt>--disable-checking</tt>.
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Additional languages can be appended to the <tt>--enable-languages</tt> switch,
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for example <tt>--enable-languages=ada,c,c++</tt>.</p>
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<pre class="doc_code">
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../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c \
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--enable-checking --enable-llvm=$PWD/../llvm-objects \
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--disable-bootstrap --disable-multilib
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</pre>
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<p>If you have a multi-compiler setup, then you can configure like this:</p>
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<pre class="doc_code">
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export CC=<b>PATH_TO_C_AND_ADA_COMPILER</b>
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export CXX=<b>PATH_TO_C++_COMPILER</b>
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../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c \
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--enable-checking --enable-llvm=$PWD/../llvm-objects \
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--disable-bootstrap --disable-multilib
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</pre>
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</li>
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<li><p>Build and install the compiler:</p>
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<pre class="doc_code">
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make
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make install
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</pre>
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</li>
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</ol>
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</div>
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<!-- *********************************************************************** -->
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<h2><a name="fortran">Building the Fortran front-end</a></h2>
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<!-- *********************************************************************** -->
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<div>
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<p>To build with support for Fortran, follow the directions in the top-level
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<tt>README.LLVM</tt> file, adding ",fortran" to EXTRALANGS, for example:</p>
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<pre class="doc_code">
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EXTRALANGS=,fortran
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</pre>
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</div>
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<!-- *********************************************************************** -->
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<h2><a name="license">License Information</a></h2>
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<!-- *********************************************************************** -->
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<div>
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<p>
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The LLVM GCC frontend is licensed to you under the GNU General Public License
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and the GNU Lesser General Public License. Please see the files COPYING and
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COPYING.LIB for more details.
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</p>
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<p>
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More information is <a href="FAQ.html#license">available in the FAQ</a>.
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</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://llvm.org/">LLVM Compiler Infrastructure</a><br>
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Last modified: $Date$
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</address>
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