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Misha Brukmanb7c3b6d2003-10-28 21:09:29 +0000[diff] [blame]7 <title>Bootstrapping the LLVM C/C++ Front-End</title>
Misha Brukman0ccf5192003-10-23 01:48:33 +0000[diff] [blame]8</head>
9<body>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]10
Misha Brukman0ccf5192003-10-23 01:48:33 +0000[diff] [blame]11<div class="doc_title">
Misha Brukmanb7c3b6d2003-10-28 21:09:29 +0000[diff] [blame]12 Bootstrapping the LLVM C/C++ Front-End
Misha Brukman0ccf5192003-10-23 01:48:33 +0000[diff] [blame]13</div>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]14
Brian Gaekee6406a82003-11-12 20:47:30 +0000[diff] [blame]15<ol>
16 <li><a href="#cautionarynote">A Cautionary Note</a>
Chris Lattnerbbdec032004-06-01 18:13:05 +0000[diff] [blame]17 <ul>
Misha Brukman35d842e2004-06-18 15:54:54 +0000[diff] [blame]18 <li><a href="#cygwin">Building under Cygwin</a></li>
Misha Brukman39efd012004-08-23 17:54:45 +0000[diff] [blame]19 <li><a href="#aix">Building under AIX</a></li>
Chris Lattnerbbdec032004-06-01 18:13:05 +0000[diff] [blame]20 </ul>
21 </li>
22 <li><a href="#instructions">Instructions</a></li>
23 <li><a href="#license">License Information</a></li>
Brian Gaekee6406a82003-11-12 20:47:30 +0000[diff] [blame]24</ol>
25
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]26<div class="doc_author">
Chris Lattnerbbdec032004-06-01 18:13:05 +0000[diff] [blame]27 <p>Written by Brian R. Gaeke and
28 <a href="http://nondot.org/sabre">Chris Lattner</a></p>
Brian Gaekee6406a82003-11-12 20:47:30 +0000[diff] [blame]29</div>
30
31<!-- *********************************************************************** -->
32<div class="doc_section">
33 <a name="cautionarynote">A Cautionary Note</a>
34</div>
35<!-- *********************************************************************** -->
36
37<div class="doc_text">
38<p>This document is intended to explain the process of building the
39LLVM C/C++ front-end, based on GCC 3.4, from its source code. You
40would have to do this, for example, if you are porting LLVM to a new
41architecture or operating system.</p>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]42
43<p><b>NOTE:</b> This is currently a somewhat fragile, error-prone
Misha Brukmanb7c3b6d2003-10-28 21:09:29 +0000[diff] [blame]44process, and you should <b>only</b> try to do it if:</p>
45
46<ol>
47 <li>you really, really, really can't use the binaries we distribute</li>
48 <li>you need GCC to fix some of the header files on your system</li>
49 <li>you are an elite GCC hacker.</li>
50</ol>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]51
52<p>We welcome patches to help make this process simpler.</p>
Brian Gaekee6406a82003-11-12 20:47:30 +0000[diff] [blame]53</div>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]54
Chris Lattnerbbdec032004-06-01 18:13:05 +0000[diff] [blame]55<!--=========================================================================-->
56<div class="doc_subsection">
Misha Brukman35d842e2004-06-18 15:54:54 +0000[diff] [blame]57 <a name="cygwin">Building under Cygwin</a>
Chris Lattnerbbdec032004-06-01 18:13:05 +0000[diff] [blame]58</div>
59<!--=========================================================================-->
60
61<div class="doc_text">
Misha Brukman35d842e2004-06-18 15:54:54 +0000[diff] [blame]62<p>If you are building LLVM and the C front-end under Cygwin, please note that
Chris Lattnerbbdec032004-06-01 18:13:05 +0000[diff] [blame]63the LLVM and GCC makefiles do not correctly handle spaces in paths. To deal
64with this issue, make sure that your LLVM and GCC source and build trees are
65located in a top-level directory (like <tt>/cygdrive/c/llvm</tt> and
66<tt>/cygdrive/c/llvm-cfrontend</tt>), not in a directory that contains a space
67(which includes your "home directory", because it lives under the "Documents
68and Settings" directory). We welcome patches to fix this issue.
69</p>
70</div>
71
Misha Brukman39efd012004-08-23 17:54:45 +0000[diff] [blame]72<!--=========================================================================-->
73<div class="doc_subsection">
74 <a name="aix">Building under AIX</a>
75</div>
76<!--=========================================================================-->
77
78<div class="doc_text">
79<p>If you are building LLVM and the C front-end under AIX, do NOT use GNU
80Binutils. They are not stable under AIX and may produce incorrect and/or
81invalid code. Instead, use the system assembler and linker.
82</p>
83</div>
84
Misha Brukman0ccf5192003-10-23 01:48:33 +0000[diff] [blame]85<!-- *********************************************************************** -->
86<div class="doc_section">
87 <a name="instructions">Instructions</a>
88</div>
89<!-- *********************************************************************** -->
90
91<div class="doc_text">
92<p>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]93<ol>
94<li><p>Configure and build the LLVM libraries and tools using:</p>
95<pre>
96 % cd llvm
Reid Spencerf6a10fa2004-12-01 05:15:44 +0000[diff] [blame^]97 % ./configure --prefix=/some/path/you/can/install/to [options...]
Misha Brukman9b5bdf92004-08-14 22:13:33 +0000[diff] [blame]98 % gmake tools-only
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]99</pre>
Reid Spencerf6a10fa2004-12-01 05:15:44 +0000[diff] [blame^]100 <p>This will build all of the LLVM tools and libraries. The <tt>--prefix</tt>
101 option defaults to /usr/local (per configure standards) but unless you are a
102 system administrator, you probably won't be able to install LLVM there because
103 of permissions. Specify a path into which LLVM can be installed (e.g.
104 <tt>--prefix=/home/user/llvm</tt>).</p>
105</li>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]106
107<li><p>Add the directory containing the tools to your PATH.</p>
108<pre>
Misha Brukman0ccf5192003-10-23 01:48:33 +0000[diff] [blame]109 % set path = ( `cd llvm/tools/Debug &amp;&amp; pwd` $path )
110</pre></li>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]111
Misha Brukman0ccf5192003-10-23 01:48:33 +0000[diff] [blame]112<li><p>Unpack the C/C++ front-end source into cfrontend/src.</p></li>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]113
Misha Brukman9b5bdf92004-08-14 22:13:33 +0000[diff] [blame]114<li><p>Make "build" and "install" directories as siblings of the "src" tree.</p>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]115<pre>
116 % pwd
117 /usr/local/example/cfrontend/src
118 % cd ..
119 % mkdir build install
120 % set CFEINSTALL = `pwd`/install
Misha Brukman0ccf5192003-10-23 01:48:33 +0000[diff] [blame]121</pre></li>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]122
Chris Lattnerbbdec032004-06-01 18:13:05 +0000[diff] [blame]123
John Criswell3c721a82003-12-10 20:04:13 +0000[diff] [blame]124<li><p>Configure, build, and install the C front-end:</p>
John Criswellffc722a72003-12-08 19:59:14 +0000[diff] [blame]125
126<p>
Misha Brukmane54cbdd2004-06-21 14:00:44 +0000[diff] [blame]127<b>Linux/x86:</b><br>
Misha Brukman65c79252004-08-09 18:37:04 +0000[diff] [blame]128<b>MacOS X/PowerPC</b> (requires dlcompat library):<br>
129<b>AIX/PowerPC:</b>
John Criswellffc722a72003-12-08 19:59:14 +0000[diff] [blame]130</p>
131
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]132<pre>
133 % cd build
Misha Brukman65c79252004-08-09 18:37:04 +0000[diff] [blame]134 % ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls \
135 --disable-shared --enable-languages=c,c++
Chris Lattnerc88858f2004-07-19 18:47:59 +0000[diff] [blame]136 % gmake
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]137 % setenv LLVM_LIB_SEARCH_PATH `pwd`/gcc
138 % gmake all; gmake install
139</pre>
140
Misha Brukman35d842e2004-06-18 15:54:54 +0000[diff] [blame]141<p><b>Cygwin/x86:</b></p>
Chris Lattner8c85ec92004-06-02 19:27:50 +0000[diff] [blame]142
143<pre>
144 % cd build
Misha Brukman65c79252004-08-09 18:37:04 +0000[diff] [blame]145 % ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls \
146 --disable-shared --enable-languages=c,c++ --disable-c-mbchar
Chris Lattnerc88858f2004-07-19 18:47:59 +0000[diff] [blame]147 % gmake
Chris Lattner8c85ec92004-06-02 19:27:50 +0000[diff] [blame]148 % setenv LLVM_LIB_SEARCH_PATH `pwd`/gcc
149 % gmake all; gmake install
150</pre>
151
152<p><b>Solaris/SPARC:</b></p>
John Criswellffc722a72003-12-08 19:59:14 +0000[diff] [blame]153
154<p>
John Criswellfc1a1dd2004-11-29 21:46:29 +0000[diff] [blame]155For Solaris/SPARC, LLVM only supports the SPARC V9 architecture. Therefore,
156the configure command line should specify sparcv9, as shown below. Also,
Brian Gaeke0119fba2004-01-28 20:54:41 +0000[diff] [blame]157note that Solaris has trouble with various wide (multibyte) character
158functions from C as referenced from C++, so we typically configure with
159--disable-c-mbchar (cf. <a href="http://llvm.cs.uiuc.edu/PR206">Bug 206</a>).
John Criswellffc722a72003-12-08 19:59:14 +0000[diff] [blame]160</p>
161
162<pre>
163 % cd build
Brian Gaeke0119fba2004-01-28 20:54:41 +0000[diff] [blame]164 % ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls \
165 --disable-shared --enable-languages=c,c++ --host=sparcv9-sun-solaris2.8 \
166 --disable-c-mbchar
Chris Lattnerc88858f2004-07-19 18:47:59 +0000[diff] [blame]167 % gmake
John Criswellffc722a72003-12-08 19:59:14 +0000[diff] [blame]168 % setenv LLVM_LIB_SEARCH_PATH `pwd`/gcc
Brian Gaeke0119fba2004-01-28 20:54:41 +0000[diff] [blame]169 % gmake all; gmake install
John Criswellffc722a72003-12-08 19:59:14 +0000[diff] [blame]170</pre>
171
Chris Lattnerf9b71182003-10-23 03:55:23 +0000[diff] [blame]172 <p><b>Common Problem:</b> You may get error messages regarding the fact
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]173 that LLVM does not support inline assembly. Here are two common
174 fixes:</p>
175
176 <ul>
177 <li><p><b>Fix 1:</b> If you have system header files that include
178 inline assembly, you may have to modify them to remove the inline
179 assembly, and install the modified versions in
Chris Lattner18b88f72004-10-06 03:13:47 +0000[diff] [blame]180 <code>$CFEINSTALL/lib/gcc/<i>target-triplet</i>/3.4-llvm/include</code>.</li>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]181
182 <li><b>Fix 2:</b> If you are building the C++ front-end on a CPU we
183 haven't tried yet, you will probably have to edit the appropriate
184 version of atomicity.h under
185 <code>src/libstdc++-v3/config/cpu/<i>name-of-cpu</i>/atomicity.h</code>
Misha Brukman4478f2b2004-05-12 18:49:47 +0000[diff] [blame]186 and apply a patch so that it does not use inline assembly.</li>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]187 </ul>
188
Chris Lattnerf9b71182003-10-23 03:55:23 +0000[diff] [blame]189 <p><b>Porting to a new architecture:</b> If you are porting the new front-end
190 to a new architecture, or compiling in a different configuration that we have
191 previously, there are probably several changes you will have to make to the GCC
192 target to get it to work correctly. These include:<p>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]193
194 <ul>
John Criswellfc1a1dd2004-11-29 21:46:29 +0000[diff] [blame]195 <li>Often targets include special assembler or linker flags which
Chris Lattnerf9b71182003-10-23 03:55:23 +0000[diff] [blame]196 <tt>gccas</tt>/<tt>gccld</tt> does not understand. In general, these can
197 just be removed.</li>
198 <li>LLVM currently does not support any floating point values other than
199 32-bit and 64-bit IEEE floating point. The primary effect of this is
200 that you may have to map "long double" onto "double".</li>
201 <li>The profiling hooks in GCC do not apply at all to the LLVM front-end.
202 These may need to be disabled.</li>
203 <li>No inline assembly for position independent code. At the LLVM level,
204 everything is position independent.</li>
205 <li>We handle <tt>.init</tt> and <tt>.fini</tt> differently.</li>
Chris Lattnerd6f136c2003-10-24 16:02:34 +0000[diff] [blame]206 <li>You may have to disable multilib support in your target. Using multilib
207 support causes the GCC compiler driver to add a lot of "<tt>-L</tt>"
208 options to the link line, which do not relate to LLVM and confuse
209 <tt>gccld</tt>. To disable multilibs, delete any
210 <tt>MULTILIB_OPTIONS</tt> lines from your target files.</li>
Chris Lattnerf9b71182003-10-23 03:55:23 +0000[diff] [blame]211 <li>Did we mention that we don't support inline assembly? You'll probably
212 have to add some fixinclude hacks to disable it in the system
213 headers.</li>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]214 </ul>
Misha Brukman0ccf5192003-10-23 01:48:33 +0000[diff] [blame]215</li>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]216
Chris Lattnerbbdec032004-06-01 18:13:05 +0000[diff] [blame]217<li><p>Go back into the LLVM source tree proper. Rerun configure, using
218the <code>--with-llvmgccdir=$CFEINSTALL</code> option to specify the path
219to the newly built C front-end.</p></li>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]220
221<li><p>If you edited header files during the C/C++ front-end build as
222described in "Fix 1" above, you must now copy those header files from
223<code>$CFEINSTALL/<i>target-triplet</i>/sys-include</code> to
224<code>$CFEINSTALL/lib/gcc/<i>target-triplet</i>/3.4-llvm/include</code>.
225(This should be the "include" directory in the same directory as the
226libgcc.a library, which you can find by running
Misha Brukman0ccf5192003-10-23 01:48:33 +0000[diff] [blame]227<code>$CFEINSTALL/bin/gcc --print-libgcc-file-name</code>.)</p></li>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]228
Chris Lattnerbbdec032004-06-01 18:13:05 +0000[diff] [blame]229<li><p>Rebuild your CVS tree. This shouldn't cause the whole thing to be
230 rebuilt, but it should build the runtime libraries. After the tree is
231 built, install the runtime libraries into your C front-end build tree.
232 These are the commands you need.</p>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]233<pre>
Chris Lattnerbbdec032004-06-01 18:13:05 +0000[diff] [blame]234 % gmake
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]235 % mkdir $CFEINSTALL/bytecode-libs
Reid Spencer45dc1392004-11-11 07:30:27 +0000[diff] [blame]236 % gmake -C runtime install
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]237 % setenv LLVM_LIB_SEARCH_PATH $CFEINSTALL/bytecode-libs
Misha Brukman0ccf5192003-10-23 01:48:33 +0000[diff] [blame]238</pre></li>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]239
Reid Spencer02c571b2004-11-25 17:13:17 +0000[diff] [blame]240<li><p>Optionally, build a symbol table for the newly installed runtime
241libraries. Although this step is optional, you are encouraged to do this as the
242symbol tables will make a significant difference in your link times. Use
243the <tt>llvm-ranlib</tt> tool to do this, as follows:</p>
244<pre>
245 % cd $CFEINSTALL/lib
246 % llvm-ranlib libiberty.a
247 % llvm-ranlib libstdc++.a
Chris Lattner2a2ebd12004-12-01 04:16:29 +0000[diff] [blame]248 % llvm-ranlib libsupc++.a
Reid Spencer02c571b2004-11-25 17:13:17 +0000[diff] [blame]249 % cd $CFEINSTALL/lib/<i>target-triplet</i>/3.4-llvm
250 % llvm-ranlib libgcc.a
251 % llvm-ranlib libgcov.a
252</pre>
253
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]254<li><p>Test the newly-installed C frontend by one or more of the
255following means:</p>
256 <ul>
Chris Lattnerf9b71182003-10-23 03:55:23 +0000[diff] [blame]257 <li> compiling and running a "hello, LLVM" program in C and C++.</li>
258 <li> running the tests under <tt>test/Programs</tt> using <code>gmake -C
Misha Brukman0ccf5192003-10-23 01:48:33 +0000[diff] [blame]259 test/Programs</code></li>
Misha Brukman4478f2b2004-05-12 18:49:47 +0000[diff] [blame]260 </ul></li>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]261</ol>
Misha Brukman0ccf5192003-10-23 01:48:33 +0000[diff] [blame]262</div>
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]263
264<!-- *********************************************************************** -->
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]265<div class="doc_section">
266 <a name="license">License Information</a>
267</div>
268
269<div class="doc_text">
270<p>
271The LLVM GCC frontend is licensed to you under the GNU General Public License
272and the GNU Lesser General Public License. Please see the files COPYING and
273COPYING.LIB for more details.
274</p>
275
276<p>
277The software also has the following additional copyrights:
278</p>
279
280<pre>
John Criswell50f289a2004-03-12 18:02:17 +0000[diff] [blame]281
282Copyright (c) 2003, 2004 University of Illinois at Urbana-Champaign.
283All rights reserved.
284
285Developed by:
286
287 LLVM Team
288
289 University of Illinois at Urbana-Champaign
290
291 http://llvm.cs.uiuc.edu
292
293THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
294IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
295FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
296CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
297LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
298OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
299SOFTWARE.
300
John Criswell86a3a482003-12-18 16:43:17 +0000[diff] [blame]301Copyright (c) 1994
302Hewlett-Packard Company
303
304Permission to use, copy, modify, distribute and sell this software
305and its documentation for any purpose is hereby granted without fee,
306provided that the above copyright notice appear in all copies and
307that both that copyright notice and this permission notice appear
308in supporting documentation. Hewlett-Packard Company makes no
309representations about the suitability of this software for any
310purpose. It is provided "as is" without express or implied warranty.
311
312Copyright (c) 1996, 1997, 1998, 1999
313Silicon Graphics Computer Systems, Inc.
314
315Permission to use, copy, modify, distribute and sell this software
316and its documentation for any purpose is hereby granted without fee,
317provided that the above copyright notice appear in all copies and
318that both that copyright notice and this permission notice appear
319in supporting documentation. Silicon Graphics makes no
320representations about the suitability of this software for any
321purpose. It is provided "as is" without express or implied warranty.
322</pre>
323</div>
324
325<!-- *********************************************************************** -->
Brian Gaeke0142c1e2003-10-21 21:58:38 +0000[diff] [blame]326
Misha Brukmanb7c3b6d2003-10-28 21:09:29 +0000[diff] [blame]327<hr>
Misha Brukman4478f2b2004-05-12 18:49:47 +0000[diff] [blame]328<address>
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333
334 Brian Gaeke<br>
335 <a href="http://llvm.cs.uiuc.edu">LLVM Compiler Infrastructure</a><br>
Misha Brukmanb7c3b6d2003-10-28 21:09:29 +0000[diff] [blame]336 Last modified: $Date$
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