<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>
<!-- *********************************************************************** -->
-<div class="doc_section">
- <a name="instructions">Building llvm-gcc from Source</a>
-</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 4.0 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>
+<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-gcc4.x-y.z.source.tar.gz archive from the
- <a href="http://llvm.org/releases/">llvm web site</a>.</p>
+ <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 4.0 code
+ 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-4.0/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>
</div>
<!-- *********************************************************************** -->
-<div class="doc_section">
- <a name="license">Building the Ada front-end</a>
-</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
<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 2.2 release</a>
+ <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
- <a href="http://libre.adacore.com/">2005 GNAT GPL Edition</a>.
- <a href="GettingStarted.html#checkout">LLVM from subversion</a>
- also works with the
- <a href="http://libre.adacore.com/">2006 and 2007 GNAT GPL Editions</a>.
+ 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/">2005 GNAT GPL Edition</a>)
+ <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
<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>
+<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>
-<div class="doc_code">
-<pre>svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm</pre>
-</div>
+<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>
-<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>
+<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>
-<div class="doc_code">
-<pre>svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk llvm-gcc-4.2</pre>
-</div>
+<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>
-<div class="doc_code">
-<pre>mkdir llvm-objects
-cd llvm-objects</pre>
-</div>
+<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>
-<div class="doc_code">
-<pre>../llvm/configure --prefix=<b>/usr/local</b></pre>
-</div>
+<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>
-<div class="doc_code">
-<pre>CXX=<b>PATH_TO_C++_COMPILER</b> ../llvm/configure --prefix=<b>/usr/local</b></pre>
-</div>
+<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 with checking enabled (use <tt>ENABLE_OPTIMIZED=1</tt> to
- build without checking):</p>
+ <li><p>Build LLVM:</p>
-<div class="doc_code">
-<pre>make ENABLE_OPTIMIZED=0</pre>
-</div>
+<pre class="doc_code">
+make
+</pre>
</li>
<li><p>Install LLVM (optional):</p>
-<div class="doc_code">
-<pre>make install</pre>
-</div>
+<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>
-<div class="doc_code">
-<pre>
+<pre class="doc_code">
cd ..
mkdir llvm-gcc-4.2-objects
-cd llvm-gcc-4.2-objects</pre>
-</div>
+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.
- If you omit it then LLVM must be built with <tt>make ENABLE_OPTIMIZED=1</tt>.
- Additional languages can be appended to the --enable-languages switch,
+ 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>
-<div class="doc_code">
-<pre>../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c --enable-checking --enable-llvm=$PWD/../llvm-objects --disable-shared --disable-bootstrap --disable-multilib</pre>
-</div>
+<pre class="doc_code">
+../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c \
+ --enable-checking --enable-llvm=$PWD/../llvm-objects \
+ --disable-bootstrap --disable-multilib
+</pre>
<p>If you have a multi-compiler setup, then you can configure like this:</p>
-<div class="doc_code">
-<pre>
+<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=$PWD/../llvm-objects --disable-shared --disable-bootstrap --disable-multilib</pre>
-</div>
+../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c \
+ --enable-checking --enable-llvm=$PWD/../llvm-objects \
+ --disable-bootstrap --disable-multilib
+</pre>
</li>
<li><p>Build and install the compiler:</p>
-<div class="doc_code">
-<pre>make
-make install</pre>
-</div>
+<pre class="doc_code">
+make
+make install
+</pre>
</li>
</ol>
</div>
<!-- *********************************************************************** -->
-<div class="doc_section">
- <a name="license">Building the Fortran front-end</a>
-</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
+<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>
+<pre class="doc_code">
EXTRALANGS=,fortran
</pre>
-</div>
</div>
<!-- *********************************************************************** -->
-<div class="doc_section">
- <a name="license">License Information</a>
-</div>
+<h1><a name="license">License Information</a></h1>
+<!-- *********************************************************************** -->
<div class="doc_text">
<p>
<hr>
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