Gitiles
Code Review Sign In
gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 444087057ad0592f3e0bb2e434e0b610aa7914f6 / . / docs / GCCFEBuildInstrs.html
blob: f9a9a0be92161d956d3488b9959883e567dee6bd [file] [log] [blame]
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
2 "http://www.w3.org/TR/html4/strict.dtd">
3<html>
4<head>
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>
17 <li><a href="#license">License Information</a></li>
18</ol>
19
20<div class="doc_author">
21 <p>Written by the LLVM Team</p>
22</div>
23
24<!-- *********************************************************************** -->
25<div class="doc_section">
26 <a name="instructions">Building llvm-gcc from Source</a>
27</div>
28<!-- *********************************************************************** -->
29
30<div class="doc_text">
31
Duncan Sands98301c02008-06-09 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 Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]37
38<ol>
Duncan Sands98301c02008-06-09 20:24:05 +0000[diff] [blame]39 <li><p>Retrieve the appropriate llvm-gcc-4.2-x.y.source.tar.gz archive from the
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]40 <a href="http://llvm.org/releases/">llvm web site</a>.</p>
41
42 <p>It is also possible to download the sources of the llvm-gcc front end
Duncan Sands98301c02008-06-09 20:24:05 +0000[diff] [blame]43 from a read-only mirror using subversion. To check out the 4.2 code
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]44 for first time use:</p>
45
46<div class="doc_code">
47<pre>
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]48svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk <i>dst-directory</i>
49</pre>
50</div>
51
52 <p>After that, the code can be be updated in the destination directory
53 using:</p>
54
55<div class="doc_code">
56<pre>svn update</pre>
57</div>
58
59 <p>The mirror is brought up to date every evening.</p></li>
60
61 <li>Follow the directions in the top-level <tt>README.LLVM</tt> file for
62 up-to-date instructions on how to build llvm-gcc. See below for building
63 with support for Ada or Fortran.
64</ol>
65
66</div>
67
68<!-- *********************************************************************** -->
69<div class="doc_section">
70 <a name="license">Building the Ada front-end</a>
71</div>
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 Sandsd918b7e2008-04-11 13:24:43 +0000[diff] [blame]86 build it. Compilers known to work with the
Duncan Sandsb8ee8012008-12-10 14:24:58 +0000[diff] [blame]87 <a href="http://llvm.org/releases/download.html">LLVM 2.4 release</a>
Duncan Sandsd918b7e2008-04-11 13:24:43 +0000[diff] [blame]88 are <a href="http://gcc.gnu.org/releases.html">gcc-4.2</a> and the
Duncan Sands98301c02008-06-09 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 Sands17bcde92008-02-16 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 Sands8655b152008-02-14 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 Sands98301c02008-06-09 20:24:05 +0000[diff] [blame]97 <a href="http://libre.adacore.com/">2007 GNAT GPL Edition</a>)
Duncan Sands8655b152008-02-14 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 Sandsd918b7e2008-04-11 13:24:43 +0000[diff] [blame]100 compiler with checking enabled. This causes it to run much slower, but
Duncan Sands8655b152008-02-14 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
112<div class="doc_code">
Duncan Sandsb8ee8012008-12-10 14:24:58 +0000[diff] [blame]113<pre>wget http://llvm.org/releases/2.4/llvm-2.4.tar.gz
114tar xzf llvm-2.4.tar.gz
115mv llvm-2.4 llvm</pre>
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]116</div>
117
118 <p>or <a href="GettingStarted.html#checkout">check out the
119 latest version from subversion</a>:</p>
120
121<div class="doc_code">
122<pre>svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm</pre>
123</div>
124 </li>
125
126 <li><p>Download the
127 <a href="http://llvm.org/releases/download.html">llvm-gcc-4.2 source</a>
128 and unpack it:</p>
129
130<div class="doc_code">
Duncan Sandsb8ee8012008-12-10 14:24:58 +0000[diff] [blame]131<pre>wget http://llvm.org/releases/2.4/llvm-gcc-4.2-2.4.source.tar.gz
132tar xzf llvm-gcc-4.2-2.4.source.tar.gz
133mv llvm-gcc4.2-2.4.source llvm-gcc-4.2</pre>
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]134</div>
135
136 <p>or <a href="GettingStarted.html#checkout">check out the
137 latest version from subversion</a>:</p>
138
139<div class="doc_code">
140<pre>svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk llvm-gcc-4.2</pre>
141</div>
142 </li>
143
144 <li><p>Make a build directory <tt>llvm-objects</tt> for llvm and make it the
145 current directory:</p>
146
147<div class="doc_code">
148<pre>mkdir llvm-objects
149cd llvm-objects</pre>
150</div>
151 </li>
152
153 <li><p>Configure LLVM (here it is configured to install into <tt>/usr/local</tt>):</p>
154
155<div class="doc_code">
156<pre>../llvm/configure --prefix=<b>/usr/local</b></pre>
157</div>
158
159 <p>If you have a multi-compiler setup and the C++ compiler is not the
160 default, then you can configure like this:</p>
161
162<div class="doc_code">
163<pre>CXX=<b>PATH_TO_C++_COMPILER</b> ../llvm/configure --prefix=<b>/usr/local</b></pre>
164</div>
165 </li>
166
167 <li><p>Build LLVM with checking enabled (use <tt>ENABLE_OPTIMIZED=1</tt> to
168 build without checking):</p>
169
170<div class="doc_code">
171<pre>make ENABLE_OPTIMIZED=0</pre>
172</div>
173 </li>
174
175 <li><p>Install LLVM (optional):</p>
176
177<div class="doc_code">
Duncan Sands98301c02008-06-09 20:24:05 +0000[diff] [blame]178<pre>make ENABLE_OPTIMIZED=0 install</pre>
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]179</div>
180 </li>
181
182 <li><p>Make a build directory <tt>llvm-gcc-4.2-objects</tt> for llvm-gcc and make it the
183 current directory:</p>
184
185<div class="doc_code">
186<pre>
187cd ..
188mkdir llvm-gcc-4.2-objects
189cd llvm-gcc-4.2-objects</pre>
190</div>
191 </li>
192
193 <li><p>Configure llvm-gcc (here it is configured to install into <tt>/usr/local</tt>).
194 The <tt>--enable-checking</tt> flag turns on sanity checks inside the compiler.
Duncan Sands98301c02008-06-09 20:24:05 +0000[diff] [blame]195 If you omit it then LLVM should be built with <tt>make ENABLE_OPTIMIZED=1</tt>.
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]196 Additional languages can be appended to the --enable-languages switch,
197 for example <tt>--enable-languages=ada,c,c++</tt>.</p>
198
199<div class="doc_code">
Duncan Sands98301c02008-06-09 20:24:05 +0000[diff] [blame]200<pre>../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c --enable-checking --enable-llvm=$PWD/../llvm-objects --disable-bootstrap --disable-multilib</pre>
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]201</div>
202
203 <p>If you have a multi-compiler setup, then you can configure like this:</p>
204<div class="doc_code">
205
206<pre>
207export CC=<b>PATH_TO_C_AND_ADA_COMPILER</b>
208export CXX=<b>PATH_TO_C++_COMPILER</b>
Duncan Sands98301c02008-06-09 20:24:05 +0000[diff] [blame]209../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c --enable-checking --enable-llvm=$PWD/../llvm-objects --disable-bootstrap --disable-multilib</pre>
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]210</div>
211 </li>
212
213 <li><p>Build and install the compiler:</p>
214
215<div class="doc_code">
216<pre>make
217make install</pre>
218</div>
219 </li>
220</ol>
221
222</div>
223
224<!-- *********************************************************************** -->
225<div class="doc_section">
226 <a name="license">Building the Fortran front-end</a>
227</div>
228
229<div class="doc_text">
230<p>
231To build with support for Fortran, follow the directions in the top-level
232<tt>README.LLVM</tt> file, adding ",fortran" to EXTRALANGS, for example:</p>
233
234<div class="doc_code">
235<pre>
236EXTRALANGS=,fortran
237</pre>
238</div>
239
240</div>
241
242<!-- *********************************************************************** -->
243<div class="doc_section">
244 <a name="license">License Information</a>
245</div>
246
247<div class="doc_text">
248<p>
249The LLVM GCC frontend is licensed to you under the GNU General Public License
250and the GNU Lesser General Public License. Please see the files COPYING and
251COPYING.LIB for more details.
252</p>
253
254<p>
255More information is <a href="FAQ.html#license">available in the FAQ</a>.
256</p>
257</div>
258
259<!-- *********************************************************************** -->
260
261<hr>
262<address>
263 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame^]264 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]265 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman44408702008-12-11 17:34:48 +0000[diff] [blame^]266 src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]267
268 <a href="http://llvm.org">LLVM Compiler Infrastructure</a><br>
269 Last modified: $Date$
270</address>
271
272</body>
273</html>