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+ <title>Building the LLVM GCC Front-End</title>
+</head>
+<body>
+
+<div class="doc_title">
+ Building the LLVM GCC Front-End
+</div>
+
+<ol>
+ <li><a href="#instructions">Building llvm-gcc from Source</a></li>
+ <li><a href="#ada">Building the Ada front-end</a></li>
+ <li><a href="#fortran">Building the Fortran front-end</a></li>
+ <li><a href="#license">License Information</a></li>
+</ol>
+
+<div class="doc_author">
+ <p>Written by the LLVM Team</p>
+</div>
+
+<!-- *********************************************************************** -->
+<h1><a name="instructions">Building llvm-gcc from Source</a></h1>
+<!-- *********************************************************************** -->
+
+<div class="doc_text">
+
+<p>This section describes how to acquire and build llvm-gcc 4.2, which is based
+on the GCC 4.2.1 front-end. Supported languages are Ada, C, C++, Fortran,
+Objective-C and Objective-C++. Note that the instructions for building these
+front-ends are completely different (and much easier!) than those for building
+llvm-gcc3 in the past.</p>
+
+<ol>
+ <li><p>Retrieve the appropriate llvm-gcc-4.2-<i>version</i>.source.tar.gz
+ archive from the <a href="http://llvm.org/releases/">LLVM web
+ site</a>.</p>
+
+ <p>It is also possible to download the sources of the llvm-gcc front end
+ from a read-only mirror using subversion. To check out the 4.2 code
+ for first time use:</p>
+
+<div class="doc_code">
+<pre>
+svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk <i>dst-directory</i>
+</pre>
+</div>
+
+ <p>After that, the code can be be updated in the destination directory
+ using:</p>
+
+<div class="doc_code">
+<pre>svn update</pre>
+</div>
+
+ <p>The mirror is brought up to date every evening.</p></li>
+
+ <li>Follow the directions in the top-level <tt>README.LLVM</tt> file for
+ up-to-date instructions on how to build llvm-gcc. See below for building
+ with support for Ada or Fortran.
+</ol>
+
+</div>
+
+<!-- *********************************************************************** -->
+<h1><a name="ada">Building the Ada front-end</a></h1>
+<!-- *********************************************************************** -->
+
+<div class="doc_text">
+<p>Building with support for Ada amounts to following the directions in the
+top-level <tt>README.LLVM</tt> file, adding ",ada" to EXTRALANGS, for example:
+<tt>EXTRALANGS=,ada</tt></p>
+
+<p>There are some complications however:</p>
+
+<ol>
+ <li><p>The only platform for which the Ada front-end is known to build is
+ 32 bit intel x86 running linux. It is unlikely to build for other
+ systems without some work.</p></li>
+ <li><p>The build requires having a compiler that supports Ada, C and C++.
+ The Ada front-end is written in Ada so an Ada compiler is needed to
+ build it. Compilers known to work with the
+ <a href="http://llvm.org/releases/download.html">LLVM 2.5 release</a>
+ are <a href="http://gcc.gnu.org/releases.html">gcc-4.2</a> and the
+ 2005, 2006 and 2007 versions of the
+ <a href="http://libre.adacore.com/">GNAT GPL Edition</a>.
+ <b>GNAT GPL 2008, gcc-4.3 and later will not work</b>.
+ The LLVM parts of llvm-gcc are written in C++ so a C++ compiler is
+ needed to build them. The rest of gcc is written in C.
+ Some linux distributions provide a version of gcc that supports all
+ three languages (the Ada part often comes as an add-on package to
+ the rest of gcc). Otherwise it is possible to combine two versions
+ of gcc, one that supports Ada and C (such as the
+ <a href="http://libre.adacore.com/">2007 GNAT GPL Edition</a>)
+ and another which supports C++, see below.</p></li>
+ <li><p>Because the Ada front-end is experimental, it is wise to build the
+ compiler with checking enabled. This causes it to run much slower, but
+ helps catch mistakes in the compiler (please report any problems using
+ <a href="http://llvm.org/bugs">LLVM bugzilla</a>).</p></li>
+ <li><p>The Ada front-end <a href="http://llvm.org/PR2007">fails to
+ bootstrap</a>, due to lack of LLVM support for
+ <tt>setjmp</tt>/<tt>longjmp</tt> style exception handling (used
+ internally by the compiler), so you must specify
+ <tt>--disable-bootstrap</tt>.</p></li>
+</ol>
+
+<p>Supposing appropriate compilers are available, llvm-gcc with Ada support can
+ be built on an x86-32 linux box using the following recipe:</p>
+
+<ol>
+ <li><p>Download the <a href="http://llvm.org/releases/download.html">LLVM source</a>
+ and unpack it:</p>
+
+<pre class="doc_code">
+wget http://llvm.org/releases/2.5/llvm-2.5.tar.gz
+tar xzf llvm-2.5.tar.gz
+mv llvm-2.5 llvm
+</pre>
+
+ <p>or <a href="GettingStarted.html#checkout">check out the
+ latest version from subversion</a>:</p>
+
+<pre class="doc_code">svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm</pre>
+
+ </li>
+
+ <li><p>Download the
+ <a href="http://llvm.org/releases/download.html">llvm-gcc-4.2 source</a>
+ and unpack it:</p>
+
+<pre class="doc_code">
+wget http://llvm.org/releases/2.5/llvm-gcc-4.2-2.5.source.tar.gz
+tar xzf llvm-gcc-4.2-2.5.source.tar.gz
+mv llvm-gcc4.2-2.5.source llvm-gcc-4.2
+</pre>
+
+ <p>or <a href="GettingStarted.html#checkout">check out the
+ latest version from subversion</a>:</p>
+
+<pre class="doc_code">
+svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk llvm-gcc-4.2
+</pre>
+ </li>
+
+ <li><p>Make a build directory <tt>llvm-objects</tt> for llvm and make it the
+ current directory:</p>
+
+<pre class="doc_code">
+mkdir llvm-objects
+cd llvm-objects
+</pre>
+ </li>
+
+ <li><p>Configure LLVM (here it is configured to install into <tt>/usr/local</tt>):</p>
+
+<pre class="doc_code">
+../llvm/configure --prefix=<b>/usr/local</b> --enable-optimized --enable-assertions
+</pre>
+
+ <p>If you have a multi-compiler setup and the C++ compiler is not the
+ default, then you can configure like this:</p>
+
+<pre class="doc_code">
+CXX=<b>PATH_TO_C++_COMPILER</b> ../llvm/configure --prefix=<b>/usr/local</b> --enable-optimized --enable-assertions
+</pre>
+
+ <p>To compile without checking (not recommended), replace
+ <tt>--enable-assertions</tt> with <tt>--disable-assertions</tt>.</p>
+
+ </li>
+
+ <li><p>Build LLVM:</p>
+
+<pre class="doc_code">
+make
+</pre>
+ </li>
+
+ <li><p>Install LLVM (optional):</p>
+
+<pre class="doc_code">
+make install
+</pre>
+ </li>
+
+ <li><p>Make a build directory <tt>llvm-gcc-4.2-objects</tt> for llvm-gcc and make it the
+ current directory:</p>
+
+<pre class="doc_code">
+cd ..
+mkdir llvm-gcc-4.2-objects
+cd llvm-gcc-4.2-objects
+</pre>
+ </li>
+
+ <li><p>Configure llvm-gcc (here it is configured to install into <tt>/usr/local</tt>).
+ The <tt>--enable-checking</tt> flag turns on sanity checks inside the compiler.
+ To turn off these checks (not recommended), replace <tt>--enable-checking</tt>
+ with <tt>--disable-checking</tt>.
+ Additional languages can be appended to the <tt>--enable-languages</tt> switch,
+ for example <tt>--enable-languages=ada,c,c++</tt>.</p>
+
+<pre class="doc_code">
+../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c \
+ --enable-checking --enable-llvm=$PWD/../llvm-objects \
+ --disable-bootstrap --disable-multilib
+</pre>
+
+ <p>If you have a multi-compiler setup, then you can configure like this:</p>
+
+<pre class="doc_code">
+export CC=<b>PATH_TO_C_AND_ADA_COMPILER</b>
+export CXX=<b>PATH_TO_C++_COMPILER</b>
+../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c \
+ --enable-checking --enable-llvm=$PWD/../llvm-objects \
+ --disable-bootstrap --disable-multilib
+</pre>
+ </li>
+
+ <li><p>Build and install the compiler:</p>
+
+<pre class="doc_code">
+make
+make install
+</pre>
+ </li>
+</ol>
+
+</div>
+
+<!-- *********************************************************************** -->
+<h1><a name="fortran">Building the Fortran front-end</a></h1>
+<!-- *********************************************************************** -->
+
+<div class="doc_text">
+<p>To build with support for Fortran, follow the directions in the top-level
+<tt>README.LLVM</tt> file, adding ",fortran" to EXTRALANGS, for example:</p>
+
+<pre class="doc_code">
+EXTRALANGS=,fortran
+</pre>
+
+</div>
+
+<!-- *********************************************************************** -->
+<h1><a name="license">License Information</a></h1>
+<!-- *********************************************************************** -->
+
+<div class="doc_text">
+<p>
+The LLVM GCC frontend is licensed to you under the GNU General Public License
+and the GNU Lesser General Public License. Please see the files COPYING and
+COPYING.LIB for more details.
+</p>
+
+<p>
+More information is <a href="FAQ.html#license">available in the FAQ</a>.
+</p>
+</div>
+
+<!-- *********************************************************************** -->
+
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