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diff --git a/docs/main/GCCFEBuildInstrs.html b/docs/main/GCCFEBuildInstrs.html new file mode 100644 index 0000000000..b675ee76a7 --- /dev/null +++ b/docs/main/GCCFEBuildInstrs.html @@ -0,0 +1,279 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" + "http://www.w3.org/TR/html4/strict.dtd"> +<html> +<head> + <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> + <link rel="stylesheet" href="llvm.css" type="text/css" media="screen"> + <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> + +<!-- *********************************************************************** --> + +<hr> +<address> + <a href="http://jigsaw.w3.org/css-validator/check/referer"><img + src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a> + <a href="http://validator.w3.org/check/referer"><img + src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a> + + <a href="http://llvm.org">LLVM Compiler Infrastructure</a><br> + Last modified: $Date$ +</address> + +</body> +</html> |