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-
<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="#license">License Information</a></li>
-</ol>
-
-<div class="doc_author">
- <p>Written by the LLVM Team</p>
-</div>
-
-<!-- *********************************************************************** -->
-<div class="doc_section">
- <a name="instructions">Building llvm-gcc from Source</a>
-</div>
-<!-- *********************************************************************** -->
-
-<div class="doc_text">
-
-<p>This section describes how to acquire and build llvm-gcc 4.0 and 4.2, which are
-based on the GCC 4.0.1/4.2.1 front-ends respectively. Both front-ends support C,
-C++, Objective-C and Objective-C++. The 4.2 front-end also supports Ada and
-Fortran to some extent. 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-gcc4.x-y.z.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 4.0 code
- for first time use:</p>
-
-<div class="doc_code">
-<pre>
-svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.0/trunk <i>dst-directory</i>
-</pre>
-</div>
-
-<p>To check out the 4.2 code 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>
-
-<!-- *********************************************************************** -->
-<div class="doc_section">
- <a name="license">Building the Ada front-end</a>
-</div>
-
-<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. 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
- <a href="http://libre.adacore.com/">GNAT GPL Edition</a>) and another
- which supports C++, see below.</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>
-
-<div class="doc_code">
-<pre>wget http://llvm.org/releases/2.2/llvm-2.2.tar.gz
-tar xzf llvm-2.2.tar.gz
-mv llvm-2.2 llvm</pre>
-</div>
-
- <p>or <a href="http://llvm.org/docs/GettingStarted.html#checkout">check out the
- latest version from subversion</a>:</p>
-
-<div class="doc_code">
-<pre>svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm</pre>
-</div>
- </li>
-
- <li><p>Download the
- <a href="http://llvm.org/releases/download.html">llvm-gcc-4.2 source</a>
- and unpack it:</p>
-
-<div class="doc_code">
-<pre>wget http://llvm.org/releases/2.2/llvm-gcc4.2-2.2.source.tar.gz
-tar xzf llvm-gcc4.2-2.2.source.tar.gz
-mv llvm-gcc4.2-2.2.source llvm-gcc-4.2</pre>
-</div>
-
- <p>or <a href="http://llvm.org/docs/GettingStarted.html#checkout">check out the
- latest version from subversion</a>:</p>
-
-<div class="doc_code">
-<pre>svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk llvm-gcc-4.2</pre>
-</div>
- </li>
-
- <li><p>Make a build directory <tt>llvm-objects</tt> for llvm and make it the
- current directory:</p>
-
-<div class="doc_code">
-<pre>mkdir llvm-objects
-cd llvm-objects</pre>
-</div>
- </li>
-
- <li><p>Configure LLVM (here it is configured to install into <tt>/usr/local</tt>):</p>
-
-<div class="doc_code">
-<pre>../llvm/configure --prefix=/usr/local</pre>
-</div>
-
- <p>If you have a multi-compiler setup and the C++ compiler is not the
- default, then you can configure like this:</p>
-
-<div class="doc_code">
-<pre>CXX=<b>PATH_TO_C++_COMPILER</b> ../llvm/configure --prefix=/usr/local</pre>
-</div>
- </li>
-
- <li><p>Build LLVM:</p>
-
-<div class="doc_code">
-<pre>make</pre>
-</div>
- </li>
-
- <li><p>Install LLVM (optional):</p>
-
-<div class="doc_code">
-<pre>make install</pre>
-</div>
- </li>
-
- <li><p>Make a build directory <tt>llvm-gcc-4.2-objects</tt> for llvm-gcc and make it the
- current directory:</p>
-
-<div class="doc_code">
-<pre>
-cd ..
-mkdir llvm-gcc-4.2-objects
-cd llvm-gcc-4.2-objects</pre>
-</div>
- </li>
-
- <li><p>Configure llvm-gcc (here it is configured to install into <tt>/usr/local</tt>).
- Additional languages can be appended to the --enable-languages switch,
- for example <tt>--enable-languages=ada,c,c++</tt>.</p>
-
-<div class="doc_code">
-<pre>../llvm-gcc-4.2/configure --prefix=/usr/local --enable-languages=ada,c --enable-checking --enable-llvm=$PWD/../llvm-objects --disable-shared --disable-bootstrap --disable-multilib</pre>
-</div>
-
- <p>If you have a multi-compiler setup, then you can configure like this:</p>
-<div class="doc_code">
-
-<pre>
-export CC=<b>PATH_TO_C_AND_ADA_COMPILER</b>
-export CXX=<b>PATH_TO_C++_COMPILER</b>
-../llvm-gcc-4.2/configure --prefix=/usr/local --enable-languages=ada,c --enable-checking --enable-llvm=$PWD/../llvm-objects --disable-shared --disable-bootstrap --disable-multilib</pre>
-</div>
- </li>
-
- <li><p>Build and install the compiler:</p>
-
-<div class="doc_code">
-<pre>make
-make install</pre>
-</div>
- </li>
-</ol>
-
-</div>
-
-<!-- *********************************************************************** -->
-<div class="doc_section">
- <a name="license">Building the Fortran front-end</a>
-</div>
-
-<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>
-
-<div class="doc_code">
-<pre>
-EXTRALANGS=,fortran
-</pre>
-</div>
-
-</div>
-
-<!-- *********************************************************************** -->
-<div class="doc_section">
- <a name="license">License Information</a>
-</div>
-
-<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>
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