<li><a href="#quickstart">Getting Started Quickly (A Summary)</a>
<li><a href="#requirements">Requirements</a>
<ol>
- <li><a href="#hardware">Hardware</a>
- <li><a href="#software">Software</a>
- <li><a href="#brokengcc">Broken versions of GCC and other tools</a>
+ <li><a href="#hardware">Hardware</a></li>
+ <li><a href="#software">Software</a></li>
+ <li><a href="#brokengcc">Broken versions of GCC and other tools</a></li>
</ol></li>
<li><a href="#starting">Getting Started with LLVM</a>
<ol>
- <li><a href="#terminology">Terminology and Notation</a>
- <li><a href="#environment">Setting Up Your Environment</a>
- <li><a href="#unpack">Unpacking the LLVM Archives</a>
- <li><a href="#checkout">Checkout LLVM from Subversion</a>
- <li><a href="#installcf">Install the GCC Front End</a>
- <li><a href="#config">Local LLVM Configuration</a>
- <li><a href="#compile">Compiling the LLVM Suite Source Code</a>
- <li><a href="#cross-compile">Cross-Compiling LLVM</a>
- <li><a href="#objfiles">The Location of LLVM Object Files</a>
- <li><a href="#optionalconfig">Optional Configuration Items</a>
+ <li><a href="#terminology">Terminology and Notation</a></li>
+ <li><a href="#environment">Setting Up Your Environment</a></li>
+ <li><a href="#unpack">Unpacking the LLVM Archives</a></li>
+ <li><a href="#checkout">Checkout LLVM from Subversion</a></li>
+ <li><a href="#installcf">Install the GCC Front End</a></li>
+ <li><a href="#config">Local LLVM Configuration</a></li>
+ <li><a href="#compile">Compiling the LLVM Suite Source Code</a></li>
+ <li><a href="#cross-compile">Cross-Compiling LLVM</a></li>
+ <li><a href="#objfiles">The Location of LLVM Object Files</a></li>
+ <li><a href="#optionalconfig">Optional Configuration Items</a></li>
</ol></li>
<li><a href="#layout">Program layout</a>
<ol>
- <li><a href="#examples"><tt>llvm/examples</tt></a>
- <li><a href="#include"><tt>llvm/include</tt></a>
- <li><a href="#lib"><tt>llvm/lib</tt></a>
- <li><a href="#projects"><tt>llvm/projects</tt></a>
- <li><a href="#runtime"><tt>llvm/runtime</tt></a>
- <li><a href="#test"><tt>llvm/test</tt></a>
- <li><a href="#llvmtest"><tt>llvm-test</tt></a>
- <li><a href="#tools"><tt>llvm/tools</tt></a>
- <li><a href="#utils"><tt>llvm/utils</tt></a>
- <li><a href="#win32"><tt>llvm/win32</tt></a>
+ <li><a href="#examples"><tt>llvm/examples</tt></a></li>
+ <li><a href="#include"><tt>llvm/include</tt></a></li>
+ <li><a href="#lib"><tt>llvm/lib</tt></a></li>
+ <li><a href="#projects"><tt>llvm/projects</tt></a></li>
+ <li><a href="#runtime"><tt>llvm/runtime</tt></a></li>
+ <li><a href="#test"><tt>llvm/test</tt></a></li>
+ <li><a href="#llvmtest"><tt>llvm-test</tt></a></li>
+ <li><a href="#tools"><tt>llvm/tools</tt></a></li>
+ <li><a href="#utils"><tt>llvm/utils</tt></a></li>
+ <li><a href="#win32"><tt>llvm/win32</tt></a></li>
</ol></li>
<li><a href="#tutorial">An Example Using the LLVM Tool Chain</a>
<li>Read the documentation.</li>
<li>Read the documentation.</li>
<li>Remember that you were warned twice about reading the documentation.</li>
- <li>Install the GCC front end if you intend to compile C or C++:
+ <li>Install the llvm-gcc-4.2 front end if you intend to compile C or C++
+ (see <a href="#installcf">Install the GCC Front End</a> for details):</li>
<ol>
<li><tt>cd <i>where-you-want-the-C-front-end-to-live</i></tt></li>
- <li><tt>gunzip --stdout llvm-gcc.<i>platform</i>.tar.gz | tar -xvf -</tt>
- </li>
- <li><tt>cd llvm-gcc3.4/<i>platform</i> (llvm-gcc3.4 only)<br>
- ./fixheaders</tt></li>
- <li>Add llvm-gcc's "bin" directory to your PATH variable.</li>
+ <li><tt>gunzip --stdout llvm-gcc-4.2-<i>version</i>-<i>platform</i>.tar.gz | tar -xvf -</tt></li>
+ <li><tt><i>install-binutils-binary-from-MinGW</i></tt> (Windows only)</li>
+ <li>Note: If the binary extension is "<tt>.bz</tt>" use <tt>bunzip2</tt> instead of <tt>gunzip</tt>.</li>
+ <li>Note: On Windows, use <a href="http://www.7-zip.org">7-Zip</a> or a similar archiving tool.</li>
+ <li>Add <tt>llvm-gcc</tt>'s "<tt>bin</tt>" directory to your <tt>PATH</tt> environment variable.</li>
</ol></li>
<li>Get the LLVM Source Code
<li><tt>--with-llvmgccdir=<i>directory</i></tt>
<p>Optionally, specify for <i>directory</i> the full pathname of the
C/C++ front end installation to use with this LLVM configuration. If
- not specified, the PATH will be searched.</p></li>
+ not specified, the PATH will be searched. This is only needed if you
+ want to run the testsuite or do some special kinds of LLVM builds.</p></li>
<li><tt>--enable-spec2000=<i>directory</i></tt>
<p>Enable the SPEC2000 benchmarks for testing. The SPEC2000
benchmarks should be available in
<th>Arch</th>
<th>Compilers</th>
</tr>
+<tr>
+ <td>AuroraUX</td>
+ <td>x86<sup><a href="#pf_1">1</a></sup></td>
+ <td>GCC</td>
+</tr>
<tr>
<td>Linux</td>
<td>x86<sup><a href="#pf_1">1</a></sup></td>
<td>GCC</td>
</tr>
+<tr>
+ <td>Linux</td>
+ <td>amd64</td>
+ <td>GCC</td>
+</tr>
<tr>
<td>Solaris</td>
<td>V9 (Ultrasparc)</td>
<td>GCC</td>
</tr>
<tr>
- <td>MacOS X<sup><a href="#pf_2">2</a></sup></td>
+ <td>MacOS X<sup><a href="#pf_2">2</a>,<a href="#pf_9">9</a></sup></td>
<td>x86</td>
<td>GCC</td>
-
</tr>
<tr>
<td>Cygwin/Win32</td>
- <td>x86<sup><a href="#pf_1">1</a>,<a href="#pf_8">8</a></sup></td>
+ <td>x86<sup><a href="#pf_1">1</a>,<a href="#pf_8">8</a>,
+ <a href="#pf_11">11</a></sup></td>
<td>GCC 3.4.X, binutils 2.15</td>
</tr>
<tr>
<td>MinGW/Win32</td>
- <td>x86<sup><a href="#pf_1">1</a>,<a href="#pf_6">6</a>,<a href="#pf_8">8</a></sup></td>
+ <td>x86<sup><a href="#pf_1">1</a>,<a href="#pf_6">6</a>,
+ <a href="#pf_8">8</a>, <a href="#pf_10">10</a></sup></td>
<td>GCC 3.4.X, binutils 2.15</td>
</tr>
-<tr>
- <td>Linux</td>
- <td>amd64<sup><a href="#pf_3">3</a></sup></td>
- <td>GCC</td>
-</tr>
</table>
<p>LLVM has partial support for the following platforms:</p>
<tr>
<td>Windows</td>
<td>x86<sup><a href="#pf_1">1</a></sup></td>
- <td>Visual Studio .NET<sup><a href="#pf_4">4</a>,<a href="#pf_5">5</a></sup></td>
+ <td>Visual Studio 2005 SP1 or higher<sup><a href="#pf_4">4</a>,<a href="#pf_5">5</a></sup></td>
<tr>
<td>AIX<sup><a href="#pf_3">3</a>,<a href="#pf_4">4</a></sup></td>
<td>PowerPC</td>
up</a></li>
<li><a name="pf_2">Code generation supported for 32-bit ABI only</a></li>
<li><a name="pf_3">No native code generation</a></li>
-<li><a name="pf_4">Build is not complete: one or more tools don't link</a></li>
+<li><a name="pf_4">Build is not complete: one or more tools do not link or function</a></li>
<li><a name="pf_5">The GCC-based C/C++ frontend does not build</a></li>
-<li><a name="pf_6">The port is done using the MSYS shell.</a>
-<a href="http://www.mingw.org/MinGWiki/">Download</a> and install
-bison (excl. M4.exe) and flex in that order. Build binutils-2.15 from source,
-if necessary. Bison & flex can be also grabbed from GNUWin32 sf.net
-project.</li>
+<li><a name="pf_6">The port is done using the MSYS shell.</a></li>
<li><a name="pf_7">Native code generation exists but is not complete.</a></li>
<li><a name="pf_8">Binutils</a> up to post-2.17 has bug in bfd/cofflink.c
preventing LLVM from building correctly. Several workarounds have been
future. We highly recommend that you rebuild your current binutils with the
patch from <a href="http://sourceware.org/bugzilla/show_bug.cgi?id=2659">
Binutils bugzilla</a>, if it wasn't already applied.</li>
+<li><a name="pf_9">XCode 2.5 and gcc 4.0.1</a> (Apple Build 5370) will trip
+ internal LLVM assert messages when compiled for Release at optimization
+ levels greater than 0 (i.e., <i>"-O1"</i> and higher).
+ Add <i>OPTIMIZE_OPTION="-O0"</i> to the build command line
+ if compiling for LLVM Release or bootstrapping the LLVM toolchain.</li>
+<li><a name="pf_10">For MSYS/MinGW on Windows, be sure to install the MSYS
+ version of the perl package, and be sure it appears in your path
+ before any Windows-based versions such as Strawberry Perl and
+ ActivePerl, as these have Windows-specifics that will cause the
+ build to fail.</a></li>
+<li><a name="pf_11">In general, LLVM modules requiring dynamic linking can
+ not be built on Windows. However, you can build LLVM tools using
+ <i>"make tools-only"</i>.</li>
</ol>
</div>
<p>Note that you will need about 1-3 GB of space for a full LLVM build in Debug
mode, depending on the system (it is so large because of all the debugging
information and the fact that the libraries are statically linked into multiple
-tools). If you do not need many of the tools and you are space-conscious,
-you can disable them individually in <tt>llvm/tools/Makefile</tt>. The Release
-build requires considerably less space.</p>
+tools). If you do not need many of the tools and you are space-conscious, you
+can pass <tt>ONLY_TOOLS="tools you need"</tt> to make. The Release build
+requires considerably less space.</p>
<p>The LLVM suite <i>may</i> compile on other platforms, but it is not
guaranteed to do so. If compilation is successful, the LLVM utilities should be
<p>The GCC front end is not very portable at the moment. If you want to get it
to work on another platform, you can download a copy of the source and <a
-href="CFEBuildInstrs.html">try to compile it</a> on your platform.</p>
+href="GCCFEBuildInstrs.html">try to compile it</a> on your platform.</p>
</div>
<td>For building the CFE</td>
</tr>
- <tr>
- <td><a href="http://www.gnu.org/software/flex">Flex</a></td>
- <td>2.5.4</td>
- <td>LEX compiler</td>
- </tr>
-
- <tr>
- <td><a href="http://www.gnu.org/software/bison/bison.html">Bison</a></td>
- <td>1.28, 1.35, 1.75, 1.875d, 2.0, or 2.1<br>(not 1.85 or 1.875)</td>
- <td>YACC compiler</td>
- </tr>
-
<tr>
<td><a href="http://subversion.tigris.org/project_packages.html">SVN</a></td>
<td>≥1.3</td>
<tr>
<td><a href="http://www.gnu.org/software/autoconf">GNU Autoconf</a></td>
- <td>2.59</td>
+ <td>2.60</td>
<td>Configuration script builder<sup><a href="#sf4">4</a></sup></td>
</tr>
<tr>
<td><a href="http://www.gnu.org/software/automake">GNU Automake</a></td>
- <td>1.9.2</td>
+ <td>1.9.6</td>
<td>aclocal macro generator<sup><a href="#sf4">4</a></sup></td>
</tr>
<tr>
<td><a href="http://savannah.gnu.org/projects/libtool">libtool</a></td>
- <td>1.5.10</td>
+ <td>1.5.22</td>
<td>Shared library manager<sup><a href="#sf4">4</a></sup></td>
</tr>
<li><b>date</b> - print the current date/time </li>
<li><b>echo</b> - print to standard output</li>
<li><b>egrep</b> - extended regular expression search utility</li>
- <li><b>etags</b> - C/C++ tag file creator for vim/emacs</li>
<li><b>find</b> - find files/dirs in a file system</li>
<li><b>grep</b> - regular expression search utility</li>
<li><b>gzip*</b> - gzip command for distribution generation</li>
problems in the STL that effectively prevent it from compiling LLVM.
</p>
-<p><b>GCC 3.2.2</b>: This version of GCC fails to compile LLVM.</p>
+<p><b>GCC 3.2.2 and 3.2.3</b>: These versions of GCC fails to compile LLVM with
+a bogus template error. This was fixed in later GCCs.</p>
<p><b>GCC 3.3.2</b>: This version of GCC suffered from a <a
href="http://gcc.gnu.org/PR13392">serious bug</a> which causes it to crash in
the "<tt>convert_from_eh_region_ranges_1</tt>" GCC function.</p>
<p><b>Cygwin GCC 3.3.3</b>: The version of GCC 3.3.3 commonly shipped with
- Cygwin does not work. Please <a href="CFEBuildInstrs.html#cygwin">upgrade
+ Cygwin does not work. Please <a href="GCCFEBuildInstrs.html#cygwin">upgrade
to a newer version</a> if possible.</p>
<p><b>SuSE GCC 3.3.3</b>: The version of GCC 3.3.3 shipped with SuSE 9.1 (and
possibly others) does not compile LLVM correctly (it appears that exception
handling is broken in some cases). Please download the FSF 3.3.3 or upgrade
to a newer version of GCC.</p>
-<p><b>GCC 3.4.0</b> on linux/x86 (32-bit)</b>: GCC miscompiles portions of the
+<p><b>GCC 3.4.0 on linux/x86 (32-bit)</b>: GCC miscompiles portions of the
code generator, causing an infinite loop in the llvm-gcc build when built
with optimizations enabled (i.e. a release build).</p>
-<p><b>GCC 3.4.2</b> on linux/x86 (32-bit)</b>: GCC miscompiles portions of the
+<p><b>GCC 3.4.2 on linux/x86 (32-bit)</b>: GCC miscompiles portions of the
code generator at -O3, as with 3.4.0. However gcc 3.4.2 (unlike 3.4.0)
correctly compiles LLVM at -O2. A work around is to build release LLVM
builds with "make ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O2 ..."</p>
-<p><b>GCC 3.4.x</b> on X86-64/amd64</b>: GCC <a href="http://llvm.org/PR1056">
+<p><b>GCC 3.4.x on X86-64/amd64</b>: GCC <a href="http://llvm.org/PR1056">
miscompiles portions of LLVM</a>.</p>
+<p><b>GCC 3.4.4 (CodeSourcery ARM 2005q3-2)</b>: this compiler miscompiles LLVM
+ when building with optimizations enabled. It appears to work with
+ "<tt>make ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O1</tt>" or build a debug
+ build.</p>
<p><b>IA-64 GCC 4.0.0</b>: The IA-64 version of GCC 4.0.0 is known to
miscompile LLVM.</p>
<p><b>Apple Xcode 2.3</b>: GCC crashes when compiling LLVM at -O3 (which is the
portions of its testsuite.</p>
<p><b>GCC 4.1.2 on OpenSUSE</b>: Seg faults during libstdc++ build and on x86_64
platforms compiling md5.c gets a mangled constant.</p>
+<p><b>GCC 4.1.2 (20061115 (prerelease) (Debian 4.1.1-21)) on Debian</b>: Appears
+to miscompile parts of LLVM 2.4. One symptom is ValueSymbolTable complaining
+about symbols remaining in the table on destruction.</p>
+<p><b>GCC 4.1.2 20071124 (Red Hat 4.1.2-42)</b>: Suffers from the same symptoms
+as the previous one. It appears to work with ENABLE_OPTIMIZED=0 (the default).</p>
+<p><b>Cygwin GCC 4.3.2 20080827 (beta) 2</b>:
+ Users <a href="http://llvm.org/PR4145">reported</a> various problems related
+ with link errors when using this GCC version.</p>
+<p><b>Debian GCC 4.3.2 on X86</b>: Crashes building some files in LLVM 2.6.</p>
+<p><b>GCC 4.3.3 (Debian 4.3.3-10) on ARM</b>: Miscompiles parts of LLVM 2.6
+when optimizations are turned on. The symptom is an infinite loop in
+FoldingSetImpl::RemoveNode while running the code generator.</p>
<p><b>GNU ld 2.16.X</b>. Some 2.16.X versions of the ld linker will produce very
long warning messages complaining that some ".gnu.linkonce.t.*" symbol was
defined in a discarded section. You can safely ignore these messages as they are
causes huge link times (minutes instead of seconds) when building LLVM. We
recommend upgrading to a newer version (2.17.50.0.4 or later).</p>
+<p><b>GNU Binutils 2.19.1 Gold</b>: This version of Gold contained
+<a href="http://sourceware.org/bugzilla/show_bug.cgi?id=9836">a bug</a>
+which causes intermittent failures when building LLVM with position independent
+code. The symptom is an error about cyclic dependencies. We recommend
+upgrading to a newer version of Gold.</p>
+
</div>
<p>The files are as follows, with <em>x.y</em> marking the version number:
<dl>
<dt><tt>llvm-x.y.tar.gz</tt></dt>
- <dd>Source release for the LLVM libraries and tools.<br/></dd>
+ <dd>Source release for the LLVM libraries and tools.<br></dd>
<dt><tt>llvm-test-x.y.tar.gz</tt></dt>
<dd>Source release for the LLVM test suite.</dd>
- <dt><tt>llvm-gcc4-x.y.source.tar.gz</tt></dt>
- <dd>Source release of the llvm-gcc4 front end. See README.LLVM in the root
- directory for build instructions.<br/></dd>
+ <dt><tt>llvm-gcc-4.2-x.y.source.tar.gz</tt></dt>
+ <dd>Source release of the llvm-gcc-4.2 front end. See README.LLVM in the root
+ directory for build instructions.<br></dd>
- <dt><tt>llvm-gcc4-x.y-platform.tar.gz</tt></dt>
- <dd>Binary release of the llvm-gcc4 front end for a specific platform.<br/></dd>
+ <dt><tt>llvm-gcc-4.2-x.y-platform.tar.gz</tt></dt>
+ <dd>Binary release of the llvm-gcc-4.2 front end for a specific platform.<br></dd>
</dl>
-<p>It is also possible to download the sources of the llvm-gcc4 front end from a
-read-only subversion mirror at
-svn://anonsvn.opensource.apple.com/svn/llvm/trunk. </p>
-
</div>
<!-- ======================================================================= -->
<div class="doc_text">
<p>If you have access to our Subversion repository, you can get a fresh copy of
-the entire source code. All you need to do is check it out from Subvresion as
+the entire source code. All you need to do is check it out from Subversion as
follows:</p>
<ul>
<p>If you want to get a specific release (as opposed to the most recent
revision), you can checkout it from the '<tt>tags</tt>' directory (instead of
'<tt>trunk</tt>'). The following releases are located in the following
- subdirectories of the '<tt>tags</tt>' directory:</p>
+subdirectories of the '<tt>tags</tt>' directory:</p>
<ul>
+<li>Release 2.6: <b>RELEASE_26</b></li>
+<li>Release 2.5: <b>RELEASE_25</b></li>
+<li>Release 2.4: <b>RELEASE_24</b></li>
+<li>Release 2.3: <b>RELEASE_23</b></li>
+<li>Release 2.2: <b>RELEASE_22</b></li>
+<li>Release 2.1: <b>RELEASE_21</b></li>
<li>Release 2.0: <b>RELEASE_20</b></li>
<li>Release 1.9: <b>RELEASE_19</b></li>
<li>Release 1.8: <b>RELEASE_18</b></li>
you run <tt>svn update</tt>.</p>
<p>If you would like to get the GCC front end source code, you can also get it
-and build it yourself. Please follow <a href="CFEBuildInstrs.html">these
+and build it yourself. Please follow <a href="GCCFEBuildInstrs.html">these
instructions</a> to successfully get and build the LLVM GCC front-end.</p>
</div>
<div class="doc_text">
-<p>Before configuring and compiling the LLVM suite, you can optionally extract the
-LLVM GCC front end from the binary distribution. It is used for running the
-llvm-test testsuite and for compiling C/C++ programs. Note that you can optionally
-<a href="CFEBuildInstrs.html">build llvm-gcc yourself</a> after building the
+<p>Before configuring and compiling the LLVM suite (or if you want to use just the LLVM
+GCC front end) you can optionally extract the front end from the binary distribution.
+It is used for running the llvm-test testsuite and for compiling C/C++ programs. Note that
+you can optionally <a href="GCCFEBuildInstrs.html">build llvm-gcc yourself</a> after building the
main LLVM repository.</p>
-<p>To install the GCC front end, do the following:</p>
+<p>To install the GCC front end, do the following (on Windows, use an archival tool
+like <a href="http://www.7-zip.org">7-zip</a> that understands gzipped tars):</p>
<ol>
<li><tt>cd <i>where-you-want-the-front-end-to-live</i></tt></li>
- <li><tt>gunzip --stdout llvmgcc-<i>version</i>.<i>platform</i>.tar.gz | tar -xvf
+ <li><tt>gunzip --stdout llvm-gcc-4.2-<i>version</i>-<i>platform</i>.tar.gz | tar -xvf
-</tt></li>
</ol>
-<p>Once the binary is uncompressed, you should add a symlink for llvm-gcc and
-llvm-g++ to some directory in your path. When you configure LLVM, it will
-automatically detect llvm-gcc's presence (if it is in your path) enabling its
-use in llvm-test. Note that you can always build or install llvm-gcc at any
-pointer after building the main LLVM repository: just reconfigure llvm and
+<p>Once the binary is uncompressed, if you're using a *nix-based system, add a symlink for
+<tt>llvm-gcc</tt> and <tt>llvm-g++</tt> to some directory in your path. If you're using a
+Windows-based system, add the <tt>bin</tt> subdirectory of your front end installation directory
+to your <tt>PATH</tt> environment variable. For example, if you uncompressed the binary to
+<tt>c:\llvm-gcc</tt>, add <tt>c:\llvm-gcc\bin</tt> to your <tt>PATH</tt>.</p>
+
+<p>If you now want to build LLVM from source, when you configure LLVM, it will
+automatically detect <tt>llvm-gcc</tt>'s presence (if it is in your path) enabling its
+use in llvm-test. Note that you can always build or install <tt>llvm-gcc</tt> at any
+point after building the main LLVM repository: just reconfigure llvm and
llvm-test will pick it up.
</p>
-<p>The binary versions of the GCC front end may not suit all of your needs. For
-example, the binary distribution may include an old version of a system header
-file, not "fix" a header file that needs to be fixed for GCC, or it may be
-linked with libraries not available on your system.</p>
+<p>As a convenience for Windows users, the front end binaries for MinGW/x86 include
+versions of the required w32api and mingw-runtime binaries. The last remaining step for
+Windows users is to simply uncompress the binary binutils package from
+<a href="http://mingw.org/">MinGW</a> into your front end installation directory. While the
+front end installation steps are not quite the same as a typical manual MinGW installation,
+they should be similar enough to those who have previously installed MinGW on Windows systems.</p>
+
+<p>To install binutils on Windows:</p>
+
+<ol>
+ <li><tt><i>download GNU Binutils from <a href="http://sourceforge.net/projects/mingw/files/">MinGW Downloads</a></i></tt></li>
+ <li><tt>cd <i>where-you-uncompressed-the-front-end</i></tt></li>
+ <li><tt><i>uncompress archived binutils directories (not the tar file) into the current directory</i></tt></li>
+</ol>
-<p>In cases like these, you may want to try <a
-href="CFEBuildInstrs.html">building the GCC front end from source.</a> This is
-much easier now than it was in the past.</p>
+<p>The binary versions of the LLVM GCC front end may not suit all of your needs. For
+example, the binary distribution may include an old version of a system header
+file, not "fix" a header file that needs to be fixed for GCC, or it may be linked with
+libraries not available on your system. In cases like these, you may want to try
+<a href="GCCFEBuildInstrs.html">building the GCC front end from source</a>. Thankfully,
+this is much easier now than it was in the past.</p>
+
+<p>We also do not currently support updating of the GCC front end by manually overlaying
+newer versions of the w32api and mingw-runtime binary packages that may become available
+from MinGW. At this time, it's best to think of the MinGW LLVM GCC front end binary as
+a self-contained convenience package that requires Windows users to simply download and
+uncompress the GNU Binutils binary package from the MinGW project.</p>
+
+<p>Regardless of your platform, if you discover that installing the LLVM GCC front end
+binaries is not as easy as previously described, or you would like to suggest improvements,
+please let us know how you would like to see things improved by dropping us a note on our
+<a href="http://llvm.org/docs/#maillist">mailing list</a>.</p>
</div>
will fail as these libraries require llvm-gcc and llvm-g++. See
<a href="#installcf">Install the GCC Front End</a> for details on installing
the C/C++ Front End. See
- <a href="CFEBuildInstrs.html">Bootstrapping the LLVM C/C++ Front-End</a>
+ <a href="GCCFEBuildInstrs.html">Bootstrapping the LLVM C/C++ Front-End</a>
for details on building the C/C++ Front End.</dd>
<dt><i>--with-tclinclude</i></dt>
<dd>Path to the tcl include directory under which <tt>tclsh</tt> can be
</dd>
<dt><i>--enable-optimized</i></dt>
<dd>
- Enables optimized compilation by default (debugging symbols are removed
- and GCC optimization flags are enabled). The default is to use an
- unoptimized build (also known as a debug build).
+ Enables optimized compilation (debugging symbols are removed
+ and GCC optimization flags are enabled). Note that this is the default
+ setting if you are using the LLVM distribution. The default behavior
+ of an Subversion checkout is to use an unoptimized build (also known as a
+ debug build).
<br><br>
</dd>
<dt><i>--enable-debug-runtime</i></dt>
native compiler (no cross-compiler targets available). The "native" target is
selected as the target of the build host. You can also specify a comma
separated list of target names that you want available in llc. The target
- names use all lower case. The current set of targets is: <br/>
+ names use all lower case. The current set of targets is: <br>
<tt>alpha, ia64, powerpc, skeleton, sparc, x86</tt>.
<br><br></dd>
<dt><i>--enable-doxygen</i></dt>
<dl>
<dt>Debug Builds
<dd>
- These builds are the default when one types <tt>gmake</tt> (unless the
- <tt>--enable-optimized</tt> option was used during configuration). The
- build system will compile the tools and libraries with debugging
- information.
+ These builds are the default when one is using an Subversion checkout and
+ types <tt>gmake</tt> (unless the <tt>--enable-optimized</tt> option was
+ used during configuration). The build system will compile the tools and
+ libraries with debugging information. To get a Debug Build using the
+ LLVM distribution the <tt>--disable-optimized</tt> option must be passed
+ to <tt>configure</tt>.
<br><br>
<dt>Release (Optimized) Builds
<tt>gmake</tt> command line. For these builds, the build system will
compile the tools and libraries with GCC optimizations enabled and strip
debugging information from the libraries and executables it generates.
+ Note that Release Builds are default when using an LLVM distribution.
<br><br>
<dt>Profile Builds
<dd>
Perform a Release (Optimized) build without assertions enabled.
<br><br>
+
+ <dt><tt>gmake ENABLE_OPTIMIZED=0</tt>
+ <dd>
+ Perform a Debug build.
+ <br><br>
<dt><tt>gmake ENABLE_PROFILING=1</tt>
<dd>
</div>
<div class="doc_text">
- <p>It is possible to cross-compile LLVM. That is, you can create LLVM
- executables and libraries for a platform different than the one one which you
- are compiling. To do this, a few additional steps are
- required. <sup><a href="#ccn_1">1</a></sup> To cross-compile LLVM, use
- these instructions:</p>
- <ol>
- <li>Configure and build LLVM as a native compiler. You will need
- just <tt>TableGen</tt> from that build.
- <ul>
- <li>If you have <tt>$LLVM_OBJ_ROOT=$LLVM_SRC_ROOT</tt> just execute
- <tt>make -C utils/TableGen</tt> after configuring.</li>
- <li>Otherwise you will need to monitor building process and terminate
- it just after <tt>TableGen</tt> was built.</li>
- </ul>
- </li>
- <li>Copy the TableGen binary to somewhere safe (out of your build tree).
- </li>
- <li>Configure LLVM to build with a cross-compiler. To do this, supply the
- configure script with <tt>--build</tt> and <tt>--host</tt> options that
- are different. The values of these options must be legal target triples
- that your GCC compiler supports.</li>
- <li>Put the saved <tt>TableGen</tt> executable into the
- into <tt>$LLVM_OBJ_ROOT/{BUILD_TYPE}/bin</tt> directory (e.g. into
- <tt>.../Release/bin</tt> for a Release build).</li>
- <li>Build LLVM as usual.</li>
- </ol>
- <p>The result of such a build will produce executables that are not executable
- on your build host (--build option) but can be executed on your compile host
+ <p>It is possible to cross-compile LLVM itself. That is, you can create LLVM
+ executables and libraries to be hosted on a platform different from the
+ platform where they are build (a Canadian Cross build). To configure a
+ cross-compile, supply the configure script with <tt>--build</tt> and
+ <tt>--host</tt> options that are different. The values of these options must
+ be legal target triples that your GCC compiler supports.</p>
+
+ <p>The result of such a build is executables that are not runnable on
+ on the build host (--build option) but can be executed on the compile host
(--host option).</p>
- <p><b>Notes:</b></p>
- <div class="doc_notes">
- <ol>
- <li><a name="ccn_1">Cross-compiling</a> was tested only with Linux as
- build platform and Windows as host using mingw32 cross-compiler. Other
- combinations have not been tested.</li>
- </ol>
- </div>
</div>
<!-- ======================================================================= -->
<p>
If you're running on a Linux system that supports the "<a
- href="http://www.tat.physik.uni-tuebingen.de/~rguenth/linux/binfmt_misc.html">
- binfmt_misc</a>"
+href="http://www.tat.physik.uni-tuebingen.de/~rguenth/linux/binfmt_misc.html">binfmt_misc</a>"
module, and you have root access on the system, you can set your system up to
-execute LLVM bitcode files directly. To do this, use commands like this (the
+execute LLVM bitcode files directly. To do this, use commands like this (the
first command may not be required if you are already using the module):</p>
<div class="doc_code">
<pre>
$ mount -t binfmt_misc none /proc/sys/fs/binfmt_misc
-$ echo ':llvm:M::llvm::/path/to/lli:' > /proc/sys/fs/binfmt_misc/register
+$ echo ':llvm:M::BC::/path/to/lli:' > /proc/sys/fs/binfmt_misc/register
$ chmod u+x hello.bc (if needed)
$ ./hello.bc
</pre>
</div>
-
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="layout"><b>Program Layout</b></a>
<p>This directory contains projects that are not strictly part of LLVM but are
shipped with LLVM. This is also the directory where you should create your own
LLVM-based projects. See <tt>llvm/projects/sample</tt> for an example of how
- to set up your own project. See <tt>llvm/projects/Stacker</tt> for a fully
- functional example of a compiler front end.</p>
+ to set up your own project.</p>
</div>
<!-- ======================================================================= -->
<dt><tt><b>lli</b></tt></dt>
<dd><tt>lli</tt> is the LLVM interpreter, which
- can directly execute LLVM bitcode (although very slowly...). In addition
- to a simple interpreter, <tt>lli</tt> also has a tracing mode (entered by
- specifying <tt>-trace</tt> on the command line). Finally, for
- architectures that support it (currently x86, Sparc, and PowerPC), by default,
- <tt>lli</tt> will function as a Just-In-Time compiler (if the
- functionality was compiled in), and will execute the code <i>much</i>
- faster than the interpreter.</dd>
+ can directly execute LLVM bitcode (although very slowly...). For architectures
+ that support it (currently x86, Sparc, and PowerPC), by default, <tt>lli</tt>
+ will function as a Just-In-Time compiler (if the functionality was compiled
+ in), and will execute the code <i>much</i> faster than the interpreter.</dd>
<dt><tt><b>llc</b></tt></dt>
<dd> <tt>llc</tt> is the LLVM backend compiler, which
<dd><tt>opt</tt> reads LLVM bitcode, applies a series of LLVM to LLVM
transformations (which are specified on the command line), and then outputs
the resultant bitcode. The '<tt>opt --help</tt>' command is a good way to
- get a list of the program transformations available in LLVM.<br/>
+ get a list of the program transformations available in LLVM.<br>
<dd><tt>opt</tt> can also be used to run a specific analysis on an input
LLVM bitcode file and print out the results. It is primarily useful for
debugging analyses, or familiarizing yourself with what an analysis does.</dd>
<div class="doc_text">
<p>This section gives an example of using LLVM. llvm-gcc3 is now obsolete,
-so we only include instructiosn for llvm-gcc4.
+so we only include instructions for llvm-gcc4.
</p>
<p><b>Note:</b> The <i>gcc4</i> frontend's invocation is <b><i>considerably different</i></b>
<div class="doc_text">
-<p>This document is just an <b>introduction</b> to how to use LLVM to do
+<p>This document is just an <b>introduction</b> on how to use LLVM to do
some simple things... there are many more interesting and complicated things
that you can do that aren't documented here (but we'll gladly accept a patch
if you want to write something up!). For more information about LLVM, check
<hr>
<address>
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- src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
+ src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
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+ src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
<a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
<a href="http://llvm.x10sys.com/rspencer/">Reid Spencer</a><br>