Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 2 | <html> |
| 3 | <head> |
| 4 | <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> |
| 5 | <link rel="stylesheet" href="llvm.css" type="text/css" media="screen" /> |
Misha Brukman | b9e5789 | 2003-10-28 21:09:29 +0000 | [diff] [blame] | 6 | <title>Bootstrapping the LLVM C/C++ Front-End</title> |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 7 | </head> |
| 8 | <body> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 9 | |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 10 | <div class="doc_title"> |
Misha Brukman | b9e5789 | 2003-10-28 21:09:29 +0000 | [diff] [blame] | 11 | Bootstrapping the LLVM C/C++ Front-End |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 12 | </div> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 13 | |
Brian Gaeke | 7af03e9 | 2003-11-12 20:47:30 +0000 | [diff] [blame] | 14 | <ol> |
| 15 | <li><a href="#cautionarynote">A Cautionary Note</a> |
| 16 | <li><a href="#instructions">Instructions</a> |
| 17 | </ol> |
| 18 | |
| 19 | <div class="doc_text"> |
| 20 | <p><b>Written by Brian R. Gaeke</b></p> |
| 21 | </div> |
| 22 | |
| 23 | <!-- *********************************************************************** --> |
| 24 | <div class="doc_section"> |
| 25 | <a name="cautionarynote">A Cautionary Note</a> |
| 26 | </div> |
| 27 | <!-- *********************************************************************** --> |
| 28 | |
| 29 | <div class="doc_text"> |
| 30 | <p>This document is intended to explain the process of building the |
| 31 | LLVM C/C++ front-end, based on GCC 3.4, from its source code. You |
| 32 | would have to do this, for example, if you are porting LLVM to a new |
| 33 | architecture or operating system.</p> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 34 | |
| 35 | <p><b>NOTE:</b> This is currently a somewhat fragile, error-prone |
Misha Brukman | b9e5789 | 2003-10-28 21:09:29 +0000 | [diff] [blame] | 36 | process, and you should <b>only</b> try to do it if:</p> |
| 37 | |
| 38 | <ol> |
| 39 | <li>you really, really, really can't use the binaries we distribute</li> |
| 40 | <li>you need GCC to fix some of the header files on your system</li> |
| 41 | <li>you are an elite GCC hacker.</li> |
| 42 | </ol> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 43 | |
| 44 | <p>We welcome patches to help make this process simpler.</p> |
Brian Gaeke | 7af03e9 | 2003-11-12 20:47:30 +0000 | [diff] [blame] | 45 | </div> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 46 | |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 47 | <!-- *********************************************************************** --> |
| 48 | <div class="doc_section"> |
| 49 | <a name="instructions">Instructions</a> |
| 50 | </div> |
| 51 | <!-- *********************************************************************** --> |
| 52 | |
| 53 | <div class="doc_text"> |
| 54 | <p> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 55 | <ol> |
| 56 | <li><p>Configure and build the LLVM libraries and tools using:</p> |
| 57 | <pre> |
| 58 | % cd llvm |
| 59 | % ./configure [options...] |
| 60 | % gmake tools-only |
| 61 | </pre> |
| 62 | <p>The use of the non-default target "tools-only" means that the |
| 63 | LLVM tools and libraries will build, and the binaries will be |
| 64 | deposited in llvm/tools/Debug, but the runtime (bytecode) |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 65 | libraries will not build.</p></li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 66 | |
| 67 | <li><p>Add the directory containing the tools to your PATH.</p> |
| 68 | <pre> |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 69 | % set path = ( `cd llvm/tools/Debug && pwd` $path ) |
| 70 | </pre></li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 71 | |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 72 | <li><p>Unpack the C/C++ front-end source into cfrontend/src.</p></li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 73 | |
| 74 | <li><p>Edit src/configure. Change the first line (starting w/ #!) to |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 75 | contain the correct full pathname of sh.</p></li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 76 | |
| 77 | <li><p>Make "build" and "install" directories as siblings of the "src" |
| 78 | tree.</p> |
| 79 | <pre> |
| 80 | % pwd |
| 81 | /usr/local/example/cfrontend/src |
| 82 | % cd .. |
| 83 | % mkdir build install |
| 84 | % set CFEINSTALL = `pwd`/install |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 85 | </pre></li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 86 | |
John Criswell | 2998d3f | 2003-12-10 20:04:13 +0000 | [diff] [blame] | 87 | <li><p>Configure, build, and install the C front-end:</p> |
John Criswell | 5507284 | 2003-12-08 19:59:14 +0000 | [diff] [blame] | 88 | |
| 89 | <p> |
| 90 | <b>Linux/x86:</b> |
| 91 | </p> |
| 92 | |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 93 | <pre> |
| 94 | % cd build |
John Criswell | 2998d3f | 2003-12-10 20:04:13 +0000 | [diff] [blame] | 95 | % ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls --disable-shared \ |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 96 | --enable-languages=c,c++ |
| 97 | % gmake all-gcc |
| 98 | % setenv LLVM_LIB_SEARCH_PATH `pwd`/gcc |
| 99 | % gmake all; gmake install |
| 100 | </pre> |
| 101 | |
John Criswell | 5507284 | 2003-12-08 19:59:14 +0000 | [diff] [blame] | 102 | <p> |
| 103 | <b>Solaris/Sparc:</b> |
| 104 | </p> |
| 105 | |
| 106 | <p> |
| 107 | For Solaris/Sparc, LLVM only supports SparcV9. Therefore, the configure |
| 108 | command line should like something like this: |
| 109 | </p> |
| 110 | |
| 111 | <pre> |
| 112 | % cd build |
John Criswell | 2998d3f | 2003-12-10 20:04:13 +0000 | [diff] [blame] | 113 | % ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls --disable-shared \ |
John Criswell | a84962c | 2003-12-10 15:27:29 +0000 | [diff] [blame] | 114 | --enable-languages=c,c++ --host=sparcv9-sun-solaris2.8 |
John Criswell | 5507284 | 2003-12-08 19:59:14 +0000 | [diff] [blame] | 115 | % gmake all-gcc |
| 116 | % setenv LLVM_LIB_SEARCH_PATH `pwd`/gcc |
| 117 | % gmake all; gmake install |
| 118 | </pre> |
| 119 | |
Chris Lattner | e38c628 | 2003-10-23 03:55:23 +0000 | [diff] [blame] | 120 | <p><b>Common Problem:</b> You may get error messages regarding the fact |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 121 | that LLVM does not support inline assembly. Here are two common |
| 122 | fixes:</p> |
| 123 | |
| 124 | <ul> |
| 125 | <li><p><b>Fix 1:</b> If you have system header files that include |
| 126 | inline assembly, you may have to modify them to remove the inline |
| 127 | assembly, and install the modified versions in |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 128 | <code>$CFEINSTALL/<i>target-triplet</i>/sys-include</code>.</p></li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 129 | |
| 130 | <li><b>Fix 2:</b> If you are building the C++ front-end on a CPU we |
| 131 | haven't tried yet, you will probably have to edit the appropriate |
| 132 | version of atomicity.h under |
| 133 | <code>src/libstdc++-v3/config/cpu/<i>name-of-cpu</i>/atomicity.h</code> |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 134 | and apply a patch so that it does not use inline assembly.</p></li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 135 | </ul> |
| 136 | |
Chris Lattner | e38c628 | 2003-10-23 03:55:23 +0000 | [diff] [blame] | 137 | <p><b>Porting to a new architecture:</b> If you are porting the new front-end |
| 138 | to a new architecture, or compiling in a different configuration that we have |
| 139 | previously, there are probably several changes you will have to make to the GCC |
| 140 | target to get it to work correctly. These include:<p> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 141 | |
| 142 | <ul> |
Chris Lattner | e38c628 | 2003-10-23 03:55:23 +0000 | [diff] [blame] | 143 | <li>Often targets include special or assembler linker flags which |
| 144 | <tt>gccas</tt>/<tt>gccld</tt> does not understand. In general, these can |
| 145 | just be removed.</li> |
| 146 | <li>LLVM currently does not support any floating point values other than |
| 147 | 32-bit and 64-bit IEEE floating point. The primary effect of this is |
| 148 | that you may have to map "long double" onto "double".</li> |
| 149 | <li>The profiling hooks in GCC do not apply at all to the LLVM front-end. |
| 150 | These may need to be disabled.</li> |
| 151 | <li>No inline assembly for position independent code. At the LLVM level, |
| 152 | everything is position independent.</li> |
| 153 | <li>We handle <tt>.init</tt> and <tt>.fini</tt> differently.</li> |
Chris Lattner | 13964e0 | 2003-10-24 16:02:34 +0000 | [diff] [blame] | 154 | <li>You may have to disable multilib support in your target. Using multilib |
| 155 | support causes the GCC compiler driver to add a lot of "<tt>-L</tt>" |
| 156 | options to the link line, which do not relate to LLVM and confuse |
| 157 | <tt>gccld</tt>. To disable multilibs, delete any |
| 158 | <tt>MULTILIB_OPTIONS</tt> lines from your target files.</li> |
Chris Lattner | e38c628 | 2003-10-23 03:55:23 +0000 | [diff] [blame] | 159 | <li>Did we mention that we don't support inline assembly? You'll probably |
| 160 | have to add some fixinclude hacks to disable it in the system |
| 161 | headers.</li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 162 | </ul> |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 163 | </li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 164 | |
| 165 | <li><p>Go back into the LLVM source tree proper. Edit Makefile.config |
| 166 | to redefine <code>LLVMGCCDIR</code> to the full pathname of the |
| 167 | <code>$CFEINSTALL</code> directory, which is the directory you just |
| 168 | installed the C front-end into. (The ./configure script is likely to |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 169 | have set this to a directory which does not exist on your system.)</p></li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 170 | |
| 171 | <li><p>If you edited header files during the C/C++ front-end build as |
| 172 | described in "Fix 1" above, you must now copy those header files from |
| 173 | <code>$CFEINSTALL/<i>target-triplet</i>/sys-include</code> to |
| 174 | <code>$CFEINSTALL/lib/gcc/<i>target-triplet</i>/3.4-llvm/include</code>. |
| 175 | (This should be the "include" directory in the same directory as the |
| 176 | libgcc.a library, which you can find by running |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 177 | <code>$CFEINSTALL/bin/gcc --print-libgcc-file-name</code>.)</p></li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 178 | |
| 179 | <li><p>Build and install the runtime (bytecode) libraries by running:</p> |
| 180 | <pre> |
| 181 | % gmake -C runtime |
| 182 | % mkdir $CFEINSTALL/bytecode-libs |
| 183 | % gmake -C runtime install |
| 184 | % setenv LLVM_LIB_SEARCH_PATH $CFEINSTALL/bytecode-libs |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 185 | </pre></li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 186 | |
| 187 | <li><p>Test the newly-installed C frontend by one or more of the |
| 188 | following means:</p> |
| 189 | <ul> |
Chris Lattner | e38c628 | 2003-10-23 03:55:23 +0000 | [diff] [blame] | 190 | <li> compiling and running a "hello, LLVM" program in C and C++.</li> |
| 191 | <li> running the tests under <tt>test/Programs</tt> using <code>gmake -C |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 192 | test/Programs</code></li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 193 | </ul> |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 194 | </p> |
| 195 | </li> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 196 | </ol> |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 197 | </div> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 198 | |
| 199 | <!-- *********************************************************************** --> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 200 | |
Misha Brukman | b9e5789 | 2003-10-28 21:09:29 +0000 | [diff] [blame] | 201 | <hr> |
| 202 | <div class="doc_footer"> |
Brian Gaeke | 7af03e9 | 2003-11-12 20:47:30 +0000 | [diff] [blame] | 203 | <address>Brian Gaeke</address> |
Misha Brukman | b9e5789 | 2003-10-28 21:09:29 +0000 | [diff] [blame] | 204 | <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a> |
| 205 | <br> |
| 206 | Last modified: $Date$ |
| 207 | </div> |
Brian Gaeke | 46079d2 | 2003-10-21 21:58:38 +0000 | [diff] [blame] | 208 | |
Misha Brukman | 83bd33a | 2003-10-23 01:48:33 +0000 | [diff] [blame] | 209 | </body> |
| 210 | </html> |