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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<link rel="stylesheet" href="llvm.css" type="text/css" media="screen">
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<title>Bootstrapping the LLVM C/C++ Front-End</title>
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</head>
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<body>
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<div class="doc_title">
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Bootstrapping the LLVM C/C++ Front-End
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</div>
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<ol>
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<li><a href="#cautionarynote">A Cautionary Note</a>
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<ul>
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<li><a href="#cygwin">Building under Cygwin</a></li>
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</ul>
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</li>
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<li><a href="#instructions">Instructions</a></li>
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<li><a href="#license">License Information</a></li>
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</ol>
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<div class="doc_author">
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<p>Written by Brian R. Gaeke and
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<a href="http://nondot.org/sabre">Chris Lattner</a></p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="cautionarynote">A Cautionary Note</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>This document is intended to explain the process of building the
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LLVM C/C++ front-end, based on GCC 3.4, from its source code. You
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would have to do this, for example, if you are porting LLVM to a new
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architecture or operating system.</p>
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<p><b>NOTE:</b> This is currently a somewhat fragile, error-prone
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process, and you should <b>only</b> try to do it if:</p>
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<ol>
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<li>you really, really, really can't use the binaries we distribute</li>
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<li>you need GCC to fix some of the header files on your system</li>
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<li>you are an elite GCC hacker.</li>
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</ol>
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<p>We welcome patches to help make this process simpler.</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="cygwin">Building under Cygwin</a>
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</div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>If you are building LLVM and the C front-end under Cygwin, please note that
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the LLVM and GCC makefiles do not correctly handle spaces in paths. To deal
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with this issue, make sure that your LLVM and GCC source and build trees are
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located in a top-level directory (like <tt>/cygdrive/c/llvm</tt> and
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<tt>/cygdrive/c/llvm-cfrontend</tt>), not in a directory that contains a space
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(which includes your "home directory", because it lives under the "Documents
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and Settings" directory). We welcome patches to fix this issue.
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</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="instructions">Instructions</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>
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<ol>
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<li><p>Configure and build the LLVM libraries and tools using:</p>
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<pre>
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% cd llvm
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% ./configure [options...]
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% gmake
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</pre>
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<p>This will build all of the LLVM tools and libraries, but you will see
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warnings about missing the C front-end (certain runtime libraries can't
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be built without it). Ignore these warnings for now.</p></li>
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<li><p>Add the directory containing the tools to your PATH.</p>
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<pre>
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% set path = ( `cd llvm/tools/Debug && pwd` $path )
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</pre></li>
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<li><p>Unpack the C/C++ front-end source into cfrontend/src.</p></li>
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<li><p>Make "build" and "install" directories as siblings of the "src"
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tree.</p>
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<pre>
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% pwd
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/usr/local/example/cfrontend/src
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% cd ..
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% mkdir build install
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% set CFEINSTALL = `pwd`/install
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</pre></li>
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<li><p>Configure, build, and install the C front-end:</p>
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<p>
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<b>Linux/x86:</b><br>
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<b>MacOS X/PowerPC</b> (requires dlcompat library):
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</p>
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<pre>
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% cd build
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% ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls --disable-shared \
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--enable-languages=c,c++
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% gmake
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% setenv LLVM_LIB_SEARCH_PATH `pwd`/gcc
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% gmake all; gmake install
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</pre>
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<p><b>Cygwin/x86:</b></p>
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<pre>
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% cd build
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% ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls --disable-shared \
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--enable-languages=c,c++ --disable-c-mbchar
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% gmake
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% setenv LLVM_LIB_SEARCH_PATH `pwd`/gcc
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% gmake all; gmake install
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</pre>
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<p><b>Solaris/SPARC:</b></p>
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<p>
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For Solaris/SPARC, LLVM only supports the SPARC V9. Therefore, the
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configure command line should specify sparcv9, as shown below. Also,
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note that Solaris has trouble with various wide (multibyte) character
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functions from C as referenced from C++, so we typically configure with
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--disable-c-mbchar (cf. <a href="http://llvm.cs.uiuc.edu/PR206">Bug 206</a>).
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</p>
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<pre>
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% cd build
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% ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls \
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--disable-shared --enable-languages=c,c++ --host=sparcv9-sun-solaris2.8 \
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--disable-c-mbchar
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% gmake
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% setenv LLVM_LIB_SEARCH_PATH `pwd`/gcc
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% gmake all; gmake install
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</pre>
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<p><b>Common Problem:</b> You may get error messages regarding the fact
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that LLVM does not support inline assembly. Here are two common
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fixes:</p>
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<ul>
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<li><p><b>Fix 1:</b> If you have system header files that include
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inline assembly, you may have to modify them to remove the inline
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assembly, and install the modified versions in
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<code>$CFEINSTALL/<i>target-triplet</i>/sys-include</code>.</li>
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<li><b>Fix 2:</b> If you are building the C++ front-end on a CPU we
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haven't tried yet, you will probably have to edit the appropriate
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version of atomicity.h under
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<code>src/libstdc++-v3/config/cpu/<i>name-of-cpu</i>/atomicity.h</code>
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and apply a patch so that it does not use inline assembly.</li>
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</ul>
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<p><b>Porting to a new architecture:</b> If you are porting the new front-end
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to a new architecture, or compiling in a different configuration that we have
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previously, there are probably several changes you will have to make to the GCC
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target to get it to work correctly. These include:<p>
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<ul>
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<li>Often targets include special or assembler linker flags which
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<tt>gccas</tt>/<tt>gccld</tt> does not understand. In general, these can
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just be removed.</li>
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<li>LLVM currently does not support any floating point values other than
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32-bit and 64-bit IEEE floating point. The primary effect of this is
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that you may have to map "long double" onto "double".</li>
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<li>The profiling hooks in GCC do not apply at all to the LLVM front-end.
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These may need to be disabled.</li>
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<li>No inline assembly for position independent code. At the LLVM level,
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everything is position independent.</li>
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<li>We handle <tt>.init</tt> and <tt>.fini</tt> differently.</li>
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<li>You may have to disable multilib support in your target. Using multilib
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support causes the GCC compiler driver to add a lot of "<tt>-L</tt>"
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options to the link line, which do not relate to LLVM and confuse
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<tt>gccld</tt>. To disable multilibs, delete any
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<tt>MULTILIB_OPTIONS</tt> lines from your target files.</li>
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<li>Did we mention that we don't support inline assembly? You'll probably
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have to add some fixinclude hacks to disable it in the system
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headers.</li>
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</ul>
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</li>
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<li><p>Go back into the LLVM source tree proper. Rerun configure, using
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the <code>--with-llvmgccdir=$CFEINSTALL</code> option to specify the path
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to the newly built C front-end.</p></li>
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<li><p>If you edited header files during the C/C++ front-end build as
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described in "Fix 1" above, you must now copy those header files from
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<code>$CFEINSTALL/<i>target-triplet</i>/sys-include</code> to
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<code>$CFEINSTALL/lib/gcc/<i>target-triplet</i>/3.4-llvm/include</code>.
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(This should be the "include" directory in the same directory as the
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libgcc.a library, which you can find by running
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<code>$CFEINSTALL/bin/gcc --print-libgcc-file-name</code>.)</p></li>
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<li><p>Rebuild your CVS tree. This shouldn't cause the whole thing to be
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rebuilt, but it should build the runtime libraries. After the tree is
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built, install the runtime libraries into your C front-end build tree.
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These are the commands you need.</p>
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<pre>
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% gmake
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% mkdir $CFEINSTALL/bytecode-libs
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% gmake -C runtime install-bytecode
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% setenv LLVM_LIB_SEARCH_PATH $CFEINSTALL/bytecode-libs
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</pre></li>
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<li><p>Test the newly-installed C frontend by one or more of the
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following means:</p>
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<ul>
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<li> compiling and running a "hello, LLVM" program in C and C++.</li>
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<li> running the tests under <tt>test/Programs</tt> using <code>gmake -C
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test/Programs</code></li>
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</ul></li>
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</ol>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="license">License Information</a>
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</div>
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<div class="doc_text">
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<p>
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The LLVM GCC frontend is licensed to you under the GNU General Public License
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and the GNU Lesser General Public License. Please see the files COPYING and
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COPYING.LIB for more details.
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</p>
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<p>
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The software also has the following additional copyrights:
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</p>
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<pre>
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Copyright (c) 2003, 2004 University of Illinois at Urbana-Champaign.
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All rights reserved.
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Developed by:
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LLVM Team
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University of Illinois at Urbana-Champaign
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http://llvm.cs.uiuc.edu
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
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SOFTWARE.
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Copyright (c) 1994
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Hewlett-Packard Company
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Permission to use, copy, modify, distribute and sell this software
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and its documentation for any purpose is hereby granted without fee,
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provided that the above copyright notice appear in all copies and
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that both that copyright notice and this permission notice appear
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in supporting documentation. Hewlett-Packard Company makes no
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representations about the suitability of this software for any
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purpose. It is provided "as is" without express or implied warranty.
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Copyright (c) 1996, 1997, 1998, 1999
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Silicon Graphics Computer Systems, Inc.
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Permission to use, copy, modify, distribute and sell this software
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and its documentation for any purpose is hereby granted without fee,
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provided that the above copyright notice appear in all copies and
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that both that copyright notice and this permission notice appear
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in supporting documentation. Silicon Graphics makes no
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representations about the suitability of this software for any
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purpose. It is provided "as is" without express or implied warranty.
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</pre>
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</div>
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<!-- *********************************************************************** -->
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<hr>
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<address>
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<a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
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<a href="http://validator.w3.org/check/referer"><img
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src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!"></a>
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Brian Gaeke<br>
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<a href="http://llvm.cs.uiuc.edu">LLVM Compiler Infrastructure</a><br>
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Last modified: $Date$
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</address>
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</body>
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</html>
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