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gerrit-public.fairphone.software / toolchain / llvm-project / ae91d9b140079f32bb4aaea675fdd74a062ec55d / . / llvm / docs / GCCFEBuildInstrs.html
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5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
6 <link rel="stylesheet" href="llvm.css" type="text/css" media="screen">
7 <title>Building the LLVM GCC Front-End</title>
8</head>
9<body>
10
11<div class="doc_title">
12 Building the LLVM GCC Front-End
13</div>
14
15<ol>
16 <li><a href="#instructions">Building llvm-gcc from Source</a></li>
Misha Brukmanfd609662008-12-29 21:33:30 +0000[diff] [blame]17 <li><a href="#ada">Building the Ada front-end</a></li>
18 <li><a href="#fortran">Building the Fortran front-end</a></li>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]19 <li><a href="#license">License Information</a></li>
20</ol>
21
22<div class="doc_author">
23 <p>Written by the LLVM Team</p>
24</div>
25
26<!-- *********************************************************************** -->
Misha Brukmanfd609662008-12-29 21:33:30 +0000[diff] [blame]27<h1><a name="instructions">Building llvm-gcc from Source</a></h1>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]28<!-- *********************************************************************** -->
29
30<div class="doc_text">
31
Duncan Sands7192a542008-06-09 20:24:05 +0000[diff] [blame]32<p>This section describes how to acquire and build llvm-gcc 4.2, which is based
33on the GCC 4.2.1 front-end. Supported languages are Ada, C, C++, Fortran,
34Objective-C and Objective-C++. Note that the instructions for building these
35front-ends are completely different (and much easier!) than those for building
36llvm-gcc3 in the past.</p>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]37
38<ol>
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]39 <li><p>Retrieve the appropriate llvm-gcc-4.2-<i>version</i>.source.tar.gz
40 archive from the <a href="http://llvm.org/releases/">LLVM web
41 site</a>.</p>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]42
43 <p>It is also possible to download the sources of the llvm-gcc front end
Duncan Sands7192a542008-06-09 20:24:05 +0000[diff] [blame]44 from a read-only mirror using subversion. To check out the 4.2 code
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]45 for first time use:</p>
46
47<div class="doc_code">
48<pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]49svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk <i>dst-directory</i>
50</pre>
51</div>
52
53 <p>After that, the code can be be updated in the destination directory
54 using:</p>
55
56<div class="doc_code">
57<pre>svn update</pre>
58</div>
59
60 <p>The mirror is brought up to date every evening.</p></li>
61
62 <li>Follow the directions in the top-level <tt>README.LLVM</tt> file for
63 up-to-date instructions on how to build llvm-gcc. See below for building
64 with support for Ada or Fortran.
65</ol>
66
67</div>
68
69<!-- *********************************************************************** -->
Misha Brukmanfd609662008-12-29 21:33:30 +0000[diff] [blame]70<h1><a name="ada">Building the Ada front-end</a></h1>
71<!-- *********************************************************************** -->
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]72
73<div class="doc_text">
74<p>Building with support for Ada amounts to following the directions in the
75top-level <tt>README.LLVM</tt> file, adding ",ada" to EXTRALANGS, for example:
76<tt>EXTRALANGS=,ada</tt></p>
77
78<p>There are some complications however:</p>
79
80<ol>
81 <li><p>The only platform for which the Ada front-end is known to build is
82 32 bit intel x86 running linux. It is unlikely to build for other
83 systems without some work.</p></li>
84 <li><p>The build requires having a compiler that supports Ada, C and C++.
85 The Ada front-end is written in Ada so an Ada compiler is needed to
Duncan Sands21285fc2008-04-11 13:24:43 +0000[diff] [blame]86 build it. Compilers known to work with the
Duncan Sandsec1b9b62008-12-10 14:24:58 +0000[diff] [blame]87 <a href="http://llvm.org/releases/download.html">LLVM 2.4 release</a>
Duncan Sands21285fc2008-04-11 13:24:43 +0000[diff] [blame]88 are <a href="http://gcc.gnu.org/releases.html">gcc-4.2</a> and the
Duncan Sands7192a542008-06-09 20:24:05 +0000[diff] [blame]89 2005, 2006 and 2007 versions of the
90 <a href="http://libre.adacore.com/">GNAT GPL Edition</a>.
Duncan Sands648e5d62008-02-16 09:47:41 +0000[diff] [blame]91 The LLVM parts of llvm-gcc are written in C++ so a C++ compiler is
92 needed to build them. The rest of gcc is written in C.
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]93 Some linux distributions provide a version of gcc that supports all
94 three languages (the Ada part often comes as an add-on package to
95 the rest of gcc). Otherwise it is possible to combine two versions
96 of gcc, one that supports Ada and C (such as the
Duncan Sands7192a542008-06-09 20:24:05 +0000[diff] [blame]97 <a href="http://libre.adacore.com/">2007 GNAT GPL Edition</a>)
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]98 and another which supports C++, see below.</p></li>
99 <li><p>Because the Ada front-end is experimental, it is wise to build the
Duncan Sands21285fc2008-04-11 13:24:43 +0000[diff] [blame]100 compiler with checking enabled. This causes it to run much slower, but
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]101 helps catch mistakes in the compiler (please report any problems using
102 <a href="http://llvm.org/bugs">LLVM bugzilla</a>).</p></li>
103</ol>
104
105<p>Supposing appropriate compilers are available, llvm-gcc with Ada support can
106 be built on an x86-32 linux box using the following recipe:</p>
107
108<ol>
109 <li><p>Download the <a href="http://llvm.org/releases/download.html">LLVM source</a>
110 and unpack it:</p>
111
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]112<pre class="doc_code">
113wget http://llvm.org/releases/2.4/llvm-2.4.tar.gz
Duncan Sandsec1b9b62008-12-10 14:24:58 +0000[diff] [blame]114tar xzf llvm-2.4.tar.gz
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]115mv llvm-2.4 llvm
116</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]117
118 <p>or <a href="GettingStarted.html#checkout">check out the
119 latest version from subversion</a>:</p>
120
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]121<pre class="doc_code">svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm</pre>
122
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]123 </li>
124
125 <li><p>Download the
126 <a href="http://llvm.org/releases/download.html">llvm-gcc-4.2 source</a>
127 and unpack it:</p>
128
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]129<pre class="doc_code">
130wget http://llvm.org/releases/2.4/llvm-gcc-4.2-2.4.source.tar.gz
Duncan Sandsec1b9b62008-12-10 14:24:58 +0000[diff] [blame]131tar xzf llvm-gcc-4.2-2.4.source.tar.gz
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]132mv llvm-gcc4.2-2.4.source llvm-gcc-4.2
133</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]134
135 <p>or <a href="GettingStarted.html#checkout">check out the
136 latest version from subversion</a>:</p>
137
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]138<pre class="doc_code">
139svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk llvm-gcc-4.2
140</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]141 </li>
142
143 <li><p>Make a build directory <tt>llvm-objects</tt> for llvm and make it the
144 current directory:</p>
145
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]146<pre class="doc_code">
147mkdir llvm-objects
148cd llvm-objects
149</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]150 </li>
151
152 <li><p>Configure LLVM (here it is configured to install into <tt>/usr/local</tt>):</p>
153
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]154<pre class="doc_code">
155../llvm/configure --prefix=<b>/usr/local</b>
156</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]157
158 <p>If you have a multi-compiler setup and the C++ compiler is not the
159 default, then you can configure like this:</p>
160
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]161<pre class="doc_code">
162CXX=<b>PATH_TO_C++_COMPILER</b> ../llvm/configure --prefix=<b>/usr/local</b>
163</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]164 </li>
165
166 <li><p>Build LLVM with checking enabled (use <tt>ENABLE_OPTIMIZED=1</tt> to
167 build without checking):</p>
168
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]169<pre class="doc_code">
170make ENABLE_OPTIMIZED=0
171</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]172 </li>
173
174 <li><p>Install LLVM (optional):</p>
175
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]176<pre class="doc_code">
177make ENABLE_OPTIMIZED=0 install
178</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]179 </li>
180
181 <li><p>Make a build directory <tt>llvm-gcc-4.2-objects</tt> for llvm-gcc and make it the
182 current directory:</p>
183
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]184<pre class="doc_code">
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]185cd ..
186mkdir llvm-gcc-4.2-objects
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]187cd llvm-gcc-4.2-objects
188</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]189 </li>
190
191 <li><p>Configure llvm-gcc (here it is configured to install into <tt>/usr/local</tt>).
192 The <tt>--enable-checking</tt> flag turns on sanity checks inside the compiler.
Duncan Sands7192a542008-06-09 20:24:05 +0000[diff] [blame]193 If you omit it then LLVM should be built with <tt>make ENABLE_OPTIMIZED=1</tt>.
Misha Brukmanb5362352009-01-03 02:35:05 +0000[diff] [blame]194 Additional languages can be appended to the <tt>--enable-languages</tt> switch,
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]195 for example <tt>--enable-languages=ada,c,c++</tt>.</p>
196
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]197<pre class="doc_code">
Misha Brukmanb5362352009-01-03 02:35:05 +0000[diff] [blame]198../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c \
199 --enable-checking --enable-llvm=$PWD/../llvm-objects \
200 --disable-bootstrap --disable-multilib
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]201</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]202
203 <p>If you have a multi-compiler setup, then you can configure like this:</p>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]204
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]205<pre class="doc_code">
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]206export CC=<b>PATH_TO_C_AND_ADA_COMPILER</b>
207export CXX=<b>PATH_TO_C++_COMPILER</b>
Misha Brukmanb5362352009-01-03 02:35:05 +0000[diff] [blame]208../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c \
209 --enable-checking --enable-llvm=$PWD/../llvm-objects \
210 --disable-bootstrap --disable-multilib
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]211</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]212 </li>
213
214 <li><p>Build and install the compiler:</p>
215
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]216<pre class="doc_code">
217make
218make install
219</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]220 </li>
221</ol>
222
223</div>
224
225<!-- *********************************************************************** -->
Misha Brukmanfd609662008-12-29 21:33:30 +0000[diff] [blame]226<h1><a name="fortran">Building the Fortran front-end</a></h1>
227<!-- *********************************************************************** -->
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]228
229<div class="doc_text">
Misha Brukmanfd609662008-12-29 21:33:30 +0000[diff] [blame]230<p>To build with support for Fortran, follow the directions in the top-level
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]231<tt>README.LLVM</tt> file, adding ",fortran" to EXTRALANGS, for example:</p>
232
Misha Brukman8dab3032008-12-29 21:20:51 +0000[diff] [blame]233<pre class="doc_code">
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]234EXTRALANGS=,fortran
235</pre>
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]236
237</div>
238
239<!-- *********************************************************************** -->
Misha Brukmanfd609662008-12-29 21:33:30 +0000[diff] [blame]240<h1><a name="license">License Information</a></h1>
241<!-- *********************************************************************** -->
Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]242
243<div class="doc_text">
244<p>
245The LLVM GCC frontend is licensed to you under the GNU General Public License
246and the GNU Lesser General Public License. Please see the files COPYING and
247COPYING.LIB for more details.
248</p>
249
250<p>
251More information is <a href="FAQ.html#license">available in the FAQ</a>.
252</p>
253</div>
254
255<!-- *********************************************************************** -->
256
257<hr>
258<address>
259 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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Duncan Sands551d3e62008-02-14 17:53:22 +0000[diff] [blame]263
264 <a href="http://llvm.org">LLVM Compiler Infrastructure</a><br>
265 Last modified: $Date$
266</address>
267
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269</html>