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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 09b51c348c9966bb6472f509bcf790ca98f8150c / . / docs / GCCFEBuildInstrs.html
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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
32<p>This section describes how to acquire and build llvm-gcc 4.0 and 4.2, which are
33based on the GCC 4.0.1/4.2.1 front-ends respectively. Both front-ends support C,
34C++, Objective-C and Objective-C++. The 4.2 front-end also supports Ada and
35Fortran to some extent. Note that the instructions for building these front-ends
36are completely different (and much easier!) than those for building llvm-gcc3 in
37the past.</p>
38
39<ol>
40 <li><p>Retrieve the appropriate llvm-gcc4.x-y.z.source.tar.gz archive from the
41 <a href="http://llvm.org/releases/">llvm web site</a>.</p>
42
43 <p>It is also possible to download the sources of the llvm-gcc front end
44 from a read-only mirror using subversion. To check out the 4.0 code
45 for first time use:</p>
46
47<div class="doc_code">
48<pre>
49svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.0/trunk <i>dst-directory</i>
50</pre>
51</div>
52
53<p>To check out the 4.2 code use:</p>
54
55<div class="doc_code">
56<pre>
57svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk <i>dst-directory</i>
58</pre>
59</div>
60
61 <p>After that, the code can be be updated in the destination directory
62 using:</p>
63
64<div class="doc_code">
65<pre>svn update</pre>
66</div>
67
68 <p>The mirror is brought up to date every evening.</p></li>
69
70 <li>Follow the directions in the top-level <tt>README.LLVM</tt> file for
71 up-to-date instructions on how to build llvm-gcc. See below for building
72 with support for Ada or Fortran.
73</ol>
74
75</div>
76
77<!-- *********************************************************************** -->
78<div class="doc_section">
79 <a name="license">Building the Ada front-end</a>
80</div>
81
82<div class="doc_text">
83<p>Building with support for Ada amounts to following the directions in the
84top-level <tt>README.LLVM</tt> file, adding ",ada" to EXTRALANGS, for example:
85<tt>EXTRALANGS=,ada</tt></p>
86
87<p>There are some complications however:</p>
88
89<ol>
90 <li><p>The only platform for which the Ada front-end is known to build is
91 32 bit intel x86 running linux. It is unlikely to build for other
92 systems without some work.</p></li>
93 <li><p>The build requires having a compiler that supports Ada, C and C++.
94 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]95 build it. Compilers known to work with the
96 <a href="http://llvm.org/releases/download.html">LLVM 2.2 release</a>
97 are <a href="http://gcc.gnu.org/releases.html">gcc-4.2</a> and the
98 <a href="http://libre.adacore.com/">2005 GNAT GPL Edition</a>.
99 <a href="GettingStarted.html#checkout">LLVM from subversion</a>
100 also works with the
101 <a href="http://libre.adacore.com/">2006 and 2007 GNAT GPL Editions</a>.
Duncan Sands17bcde92008-02-16 09:47:41 +0000[diff] [blame]102 The LLVM parts of llvm-gcc are written in C++ so a C++ compiler is
103 needed to build them. The rest of gcc is written in C.
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]104 Some linux distributions provide a version of gcc that supports all
105 three languages (the Ada part often comes as an add-on package to
106 the rest of gcc). Otherwise it is possible to combine two versions
107 of gcc, one that supports Ada and C (such as the
Duncan Sandsd918b7e2008-04-11 13:24:43 +0000[diff] [blame]108 <a href="http://libre.adacore.com/">2005 GNAT GPL Edition</a>)
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]109 and another which supports C++, see below.</p></li>
110 <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]111 compiler with checking enabled. This causes it to run much slower, but
Duncan Sands8655b152008-02-14 17:53:22 +0000[diff] [blame]112 helps catch mistakes in the compiler (please report any problems using
113 <a href="http://llvm.org/bugs">LLVM bugzilla</a>).</p></li>
114</ol>
115
116<p>Supposing appropriate compilers are available, llvm-gcc with Ada support can
117 be built on an x86-32 linux box using the following recipe:</p>
118
119<ol>
120 <li><p>Download the <a href="http://llvm.org/releases/download.html">LLVM source</a>
121 and unpack it:</p>
122
123<div class="doc_code">
124<pre>wget http://llvm.org/releases/2.2/llvm-2.2.tar.gz
125tar xzf llvm-2.2.tar.gz
126mv llvm-2.2 llvm</pre>
127</div>
128
129 <p>or <a href="GettingStarted.html#checkout">check out the
130 latest version from subversion</a>:</p>
131
132<div class="doc_code">
133<pre>svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm</pre>
134</div>
135 </li>
136
137 <li><p>Download the
138 <a href="http://llvm.org/releases/download.html">llvm-gcc-4.2 source</a>
139 and unpack it:</p>
140
141<div class="doc_code">
142<pre>wget http://llvm.org/releases/2.2/llvm-gcc4.2-2.2.source.tar.gz
143tar xzf llvm-gcc4.2-2.2.source.tar.gz
144mv llvm-gcc4.2-2.2.source llvm-gcc-4.2</pre>
145</div>
146
147 <p>or <a href="GettingStarted.html#checkout">check out the
148 latest version from subversion</a>:</p>
149
150<div class="doc_code">
151<pre>svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk llvm-gcc-4.2</pre>
152</div>
153 </li>
154
155 <li><p>Make a build directory <tt>llvm-objects</tt> for llvm and make it the
156 current directory:</p>
157
158<div class="doc_code">
159<pre>mkdir llvm-objects
160cd llvm-objects</pre>
161</div>
162 </li>
163
164 <li><p>Configure LLVM (here it is configured to install into <tt>/usr/local</tt>):</p>
165
166<div class="doc_code">
167<pre>../llvm/configure --prefix=<b>/usr/local</b></pre>
168</div>
169
170 <p>If you have a multi-compiler setup and the C++ compiler is not the
171 default, then you can configure like this:</p>
172
173<div class="doc_code">
174<pre>CXX=<b>PATH_TO_C++_COMPILER</b> ../llvm/configure --prefix=<b>/usr/local</b></pre>
175</div>
176 </li>
177
178 <li><p>Build LLVM with checking enabled (use <tt>ENABLE_OPTIMIZED=1</tt> to
179 build without checking):</p>
180
181<div class="doc_code">
182<pre>make ENABLE_OPTIMIZED=0</pre>
183</div>
184 </li>
185
186 <li><p>Install LLVM (optional):</p>
187
188<div class="doc_code">
189<pre>make install</pre>
190</div>
191 </li>
192
193 <li><p>Make a build directory <tt>llvm-gcc-4.2-objects</tt> for llvm-gcc and make it the
194 current directory:</p>
195
196<div class="doc_code">
197<pre>
198cd ..
199mkdir llvm-gcc-4.2-objects
200cd llvm-gcc-4.2-objects</pre>
201</div>
202 </li>
203
204 <li><p>Configure llvm-gcc (here it is configured to install into <tt>/usr/local</tt>).
205 The <tt>--enable-checking</tt> flag turns on sanity checks inside the compiler.
206 If you omit it then LLVM must be built with <tt>make ENABLE_OPTIMIZED=1</tt>.
207 Additional languages can be appended to the --enable-languages switch,
208 for example <tt>--enable-languages=ada,c,c++</tt>.</p>
209
210<div class="doc_code">
211<pre>../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c --enable-checking --enable-llvm=$PWD/../llvm-objects --disable-shared --disable-bootstrap --disable-multilib</pre>
212</div>
213
214 <p>If you have a multi-compiler setup, then you can configure like this:</p>
215<div class="doc_code">
216
217<pre>
218export CC=<b>PATH_TO_C_AND_ADA_COMPILER</b>
219export CXX=<b>PATH_TO_C++_COMPILER</b>
220../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c --enable-checking --enable-llvm=$PWD/../llvm-objects --disable-shared --disable-bootstrap --disable-multilib</pre>
221</div>
222 </li>
223
224 <li><p>Build and install the compiler:</p>
225
226<div class="doc_code">
227<pre>make
228make install</pre>
229</div>
230 </li>
231</ol>
232
233</div>
234
235<!-- *********************************************************************** -->
236<div class="doc_section">
237 <a name="license">Building the Fortran front-end</a>
238</div>
239
240<div class="doc_text">
241<p>
242To build with support for Fortran, follow the directions in the top-level
243<tt>README.LLVM</tt> file, adding ",fortran" to EXTRALANGS, for example:</p>
244
245<div class="doc_code">
246<pre>
247EXTRALANGS=,fortran
248</pre>
249</div>
250
251</div>
252
253<!-- *********************************************************************** -->
254<div class="doc_section">
255 <a name="license">License Information</a>
256</div>
257
258<div class="doc_text">
259<p>
260The LLVM GCC frontend is licensed to you under the GNU General Public License
261and the GNU Lesser General Public License. Please see the files COPYING and
262COPYING.LIB for more details.
263</p>
264
265<p>
266More information is <a href="FAQ.html#license">available in the FAQ</a>.
267</p>
268</div>
269
270<!-- *********************************************************************** -->
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