docs/GettingStartedVS.html - platform/external/llvm - Gitiles

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 </head>
 <body>

 <h1>
   Getting Started with the LLVM System using Microsoft Visual Studio
 </h1>

 <ul>
   <li><a href="#overview">Overview</a>
   <li><a href="#requirements">Requirements</a>
     <ol>
       <li><a href="#hardware">Hardware</a>
       <li><a href="#software">Software</a>
     </ol></li>
   <li><a href="#quickstart">Getting Started</a>
   <li><a href="#tutorial">An Example Using the LLVM Tool Chain</a>
   <li><a href="#problems">Common Problems</a>
   <li><a href="#links">Links</a>
 </ul>

 <div class="doc_author">
   <p>Written by: <a href="http://llvm.org/">The LLVM Team</a></p>
 </div>


 <!-- *********************************************************************** -->
 <h2>
   <a name="overview"><b>Overview</b></a>
 </h2>
 <!-- *********************************************************************** -->

 <div>

   <p>Welcome to LLVM on Windows! This document only covers LLVM on Windows using
   Visual Studio, not mingw or cygwin. In order to get started, you first need to
   know some basic information.</p>

   <p>There are many different projects that compose LLVM. The first is the LLVM
   suite. This contains all of the tools, libraries, and header files needed to
   use LLVM. It contains an assembler, disassembler,
   bitcode analyzer and bitcode optimizer. It also contains a test suite that can
   be used to test the LLVM tools.</p>

   <p>Another useful project on Windows is
   <a href="http://clang.llvm.org/">clang</a>. Clang is a C family
   ([Objective]C/C++) compiler. Clang mostly works on Windows, but does not
   currently understand all of the Microsoft extensions to C and C++. Because of
   this, clang cannot parse the C++ standard library included with Visual Studio,
   nor parts of the Windows Platform SDK. However, most standard C programs do
   compile. Clang can be used to emit bitcode, directly emit object files or
   even linked executables using Visual Studio's <tt>link.exe</tt></p>

   <p>The large LLVM test suite cannot be run on the Visual Studio port at this
   time.</p>

   <p>Most of the tools build and work.  <tt>bugpoint</tt> does build, but does
   not work.</p>

   <p>Additional information about the LLVM directory structure and tool chain
   can be found on the main <a href="GettingStarted.html">Getting Started</a>
   page.</p>

 </div>

 <!-- *********************************************************************** -->
 <h2>
   <a name="requirements"><b>Requirements</b></a>
 </h2>
 <!-- *********************************************************************** -->

 <div>

   <p>Before you begin to use the LLVM system, review the requirements given
   below.  This may save you some trouble by knowing ahead of time what hardware
   and software you will need.</p>

 <!-- ======================================================================= -->
 <h3>
   <a name="hardware"><b>Hardware</b></a>
 </h3>

 <div>

   <p>Any system that can adequately run Visual Studio 2008 is fine. The LLVM
   source tree and object files, libraries and executables will consume
   approximately 3GB.</p>

 </div>

 <!-- ======================================================================= -->
 <h3><a name="software"><b>Software</b></a></h3>
 <div>

   <p>You will need Visual Studio 2008 or higher.  Earlier versions of Visual
   Studio have bugs, are not completely compatible, or do not support the C++
   standard well enough.</p>

   <p>You will also need the <a href="http://www.cmake.org/">CMake</a> build
   system since it generates the project files you will use to build with.</p>

   <p>If you would like to run the LLVM tests you will need
   <a href="http://www.python.org/">Python</a>. Versions 2.4-2.7 are known to
   work. You will need <a href="http://gnuwin32.sourceforge.net/">"GnuWin32"</a>
   tools, too.</p>

   <p>Do not install the LLVM directory tree into a path containing spaces (e.g.
   C:\Documents and Settings\...) as the configure step will fail.</p>

 </div>

 </div>

 <!-- *********************************************************************** -->
 <h2>
   <a name="quickstart"><b>Getting Started</b></a>
 </h2>
 <!-- *********************************************************************** -->

 <div>

 <p>Here's the short story for getting up and running quickly with LLVM:</p>

 <ol>
   <li>Read the documentation.</li>
   <li>Seriously, read the documentation.</li>
   <li>Remember that you were warned twice about reading the documentation.</li>

   <li>Get the Source Code
   <ul>
     <li>With the distributed files:
     <ol>
       <li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
       <li><tt>gunzip --stdout llvm-<i>version</i>.tar.gz | tar -xvf -</tt>
       <i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;or use WinZip</i>
       <li><tt>cd llvm</tt></li>
     </ol></li>

     <li>With anonymous Subversion access:
     <ol>
       <li><tt>cd <i>where-you-want-llvm-to-live</i></tt></li>
       <li><tt>svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm</tt></li>
       <li><tt>cd llvm</tt></li>
     </ol></li>
   </ul></li>

   <li> Use <a href="http://www.cmake.org/">CMake</a> to generate up-to-date
     project files:
     <ul>
       <li>Once CMake is installed then the simplest way is to just start the
         CMake GUI, select the directory where you have LLVM extracted to, and the
         default options should all be fine.  One option you may really want to
         change, regardless of anything else, might be the CMAKE_INSTALL_PREFIX
         setting to select a directory to INSTALL to once compiling is complete,
         although installation is not mandatory for using LLVM.  Another important
         option is LLVM_TARGETS_TO_BUILD, which controls the LLVM target
         architectures that are included on the build.
       <li>See the <a href="CMake.html">LLVM CMake guide</a> for
         detailed information about how to configure the LLVM
         build.</li>
     </ul>
   </li>

   <li>Start Visual Studio
   <ul>
     <li>In the directory you created the project files will have
     an <tt>llvm.sln</tt> file, just double-click on that to open
     Visual Studio.</li>
   </ul></li>

   <li>Build the LLVM Suite:
   <ul>
     <li>The projects may still be built individually, but
     to build them all do not just select all of them in batch build (as some
     are meant as configuration projects), but rather select and build just
     the ALL_BUILD project to build everything, or the INSTALL project, which
     first builds the ALL_BUILD project, then installs the LLVM headers, libs,
     and other useful things to the directory set by the CMAKE_INSTALL_PREFIX
     setting when you first configured CMake.</li>
     <li>The Fibonacci project is a sample program that uses the JIT.
     Modify the project's debugging properties to provide a numeric
     command line argument or run it from the command line.  The
     program will print the corresponding fibonacci value.</li>
   </ul></li>

   <li>Test LLVM on Visual Studio:
   <ul>
     <li>If %PATH% does not contain GnuWin32, you may specify LLVM_LIT_TOOLS_DIR
     on CMake for the path to GnuWin32.</li>
     <li>You can run LLVM tests by merely building the project
       "check". The test results will be shown in the VS output
       window.</li>
   </ul>
   </li>

   <!-- FIXME: Is it up-to-date? -->
   <li>Test LLVM:
   <ul>
     <li>The LLVM tests can be run by <tt>cd</tt>ing to the llvm source directory
         and running:

 <div class="doc_code">
 <pre>
 % llvm-lit test
 </pre>
 </div>

     <p>Note that quite a few of these test will fail.</p>
     </li>

     <li>A specific test or test directory can be run with:

 <div class="doc_code">
 <pre>
 % llvm-lit test/path/to/test
 </pre>
 </div>
     </li>
   </ul>
 </ol>

 </div>

 <!-- *********************************************************************** -->
 <h2>
   <a name="tutorial">An Example Using the LLVM Tool Chain</a>
 </h2>
 <!-- *********************************************************************** -->

 <div>

 <ol>
   <li><p>First, create a simple C file, name it 'hello.c':</p>

 <div class="doc_code">
 <pre>
 #include &lt;stdio.h&gt;
 int main() {
   printf("hello world\n");
   return 0;
 }
 </pre></div></li>

   <li><p>Next, compile the C file into a LLVM bitcode file:</p>

 <div class="doc_code">
 <pre>
 % clang -c hello.c -emit-llvm -o hello.bc
 </pre>
 </div>

       <p>This will create the result file <tt>hello.bc</tt> which is the LLVM
          bitcode that corresponds the the compiled program and the library
          facilities that it required.  You can execute this file directly using
          <tt>lli</tt> tool, compile it to native assembly with the <tt>llc</tt>,
          optimize or analyze it further with the <tt>opt</tt> tool, etc.</p>

       <p>Alternatively you can directly output an executable with clang with:
       </p>

 <div class="doc_code">
 <pre>
 % clang hello.c -o hello.exe
 </pre>
 </div>

   <p>The <tt>-o hello.exe</tt> is required because clang currently outputs
   <tt>a.out</tt> when neither <tt>-o</tt> nor <tt>-c</tt> are given.</p>

   <li><p>Run the program using the just-in-time compiler:</p>

 <div class="doc_code">
 <pre>
 % lli hello.bc
 </pre>
 </div>

   <li><p>Use the <tt>llvm-dis</tt> utility to take a look at the LLVM assembly
       code:</p>

 <div class="doc_code">
 <pre>
 % llvm-dis &lt; hello.bc | more
 </pre>
 </div></li>

   <li><p>Compile the program to object code using the LLC code generator:</p>

 <div class="doc_code">
 <pre>
 % llc -filetype=obj hello.bc
 </pre>
 </div></li>

   <li><p>Link to binary using Microsoft link:</p>

 <div class="doc_code">
 <pre>
 % link hello.obj -defaultlib:libcmt
 </pre>
 </div>

   <li><p>Execute the native code program:</p>

 <div class="doc_code">
 <pre>
 % hello.exe
 </pre>
 </div></li>
 </ol>

 </div>

 <!-- *********************************************************************** -->
 <h2>
   <a name="problems">Common Problems</a>
 </h2>
 <!-- *********************************************************************** -->

 <div>

 <p>If you are having problems building or using LLVM, or if you have any other
 general questions about LLVM, please consult the <a href="FAQ.html">Frequently
 Asked Questions</a> page.</p>

 </div>

 <!-- *********************************************************************** -->
 <h2>
   <a name="links">Links</a>
 </h2>
 <!-- *********************************************************************** -->

 <div>

 <p>This document is just an <b>introduction</b> to 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
 out:</p>

 <ul>
   <li><a href="http://llvm.org/">LLVM homepage</a></li>
   <li><a href="http://llvm.org/doxygen/">LLVM doxygen tree</a></li>
 </ul>

 </div>

 <!-- *********************************************************************** -->

 <hr>
 <address>
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   Last modified: $Date$
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	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
	"http://www.w3.org/TR/html4/strict.dtd">
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
	<title>Getting Started with LLVM System for Microsoft Visual Studio</title>
	<link rel="stylesheet" href="llvm.css" type="text/css">
	</head>
	<body>

	<h1>
	Getting Started with the LLVM System using Microsoft Visual Studio
	</h1>

	<ul>
	<li><a href="#overview">Overview</a>
	<li><a href="#requirements">Requirements</a>
	<ol>
	<li><a href="#hardware">Hardware</a>
	<li><a href="#software">Software</a>
	</ol></li>
	<li><a href="#quickstart">Getting Started</a>
	<li><a href="#tutorial">An Example Using the LLVM Tool Chain</a>
	<li><a href="#problems">Common Problems</a>
	<li><a href="#links">Links</a>
	</ul>

	<div class="doc_author">
	<p>Written by: <a href="http://llvm.org/">The LLVM Team</a></p>
	</div>


	<!-- *********************************************************************** -->
	<h2>
	<a name="overview"><b>Overview</b></a>
	</h2>
	<!-- *********************************************************************** -->

	<div>

	<p>Welcome to LLVM on Windows! This document only covers LLVM on Windows using
	Visual Studio, not mingw or cygwin. In order to get started, you first need to
	know some basic information.</p>

	<p>There are many different projects that compose LLVM. The first is the LLVM
	suite. This contains all of the tools, libraries, and header files needed to
	use LLVM. It contains an assembler, disassembler,
	bitcode analyzer and bitcode optimizer. It also contains a test suite that can
	be used to test the LLVM tools.</p>

	<p>Another useful project on Windows is
	<a href="http://clang.llvm.org/">clang</a>. Clang is a C family
	([Objective]C/C++) compiler. Clang mostly works on Windows, but does not
	currently understand all of the Microsoft extensions to C and C++. Because of
	this, clang cannot parse the C++ standard library included with Visual Studio,
	nor parts of the Windows Platform SDK. However, most standard C programs do
	compile. Clang can be used to emit bitcode, directly emit object files or
	even linked executables using Visual Studio's <tt>link.exe</tt></p>

	<p>The large LLVM test suite cannot be run on the Visual Studio port at this
	time.</p>

	<p>Most of the tools build and work. <tt>bugpoint</tt> does build, but does
	not work.</p>

	<p>Additional information about the LLVM directory structure and tool chain
	can be found on the main <a href="GettingStarted.html">Getting Started</a>
	page.</p>

	</div>

	<!-- *********************************************************************** -->
	<h2>
	<a name="requirements"><b>Requirements</b></a>
	</h2>
	<!-- *********************************************************************** -->

	<div>

	<p>Before you begin to use the LLVM system, review the requirements given
	below. This may save you some trouble by knowing ahead of time what hardware
	and software you will need.</p>

	<!-- ======================================================================= -->
	<h3>
	<a name="hardware"><b>Hardware</b></a>
	</h3>

	<div>

	<p>Any system that can adequately run Visual Studio 2008 is fine. The LLVM
	source tree and object files, libraries and executables will consume
	approximately 3GB.</p>

	</div>

	<!-- ======================================================================= -->
	<h3><a name="software"><b>Software</b></a></h3>
	<div>

	<p>You will need Visual Studio 2008 or higher. Earlier versions of Visual
	Studio have bugs, are not completely compatible, or do not support the C++
	standard well enough.</p>

	<p>You will also need the <a href="http://www.cmake.org/">CMake</a> build
	system since it generates the project files you will use to build with.</p>

	<p>If you would like to run the LLVM tests you will need
	<a href="http://www.python.org/">Python</a>. Versions 2.4-2.7 are known to
	work. You will need <a href="http://gnuwin32.sourceforge.net/">"GnuWin32"</a>
	tools, too.</p>

	<p>Do not install the LLVM directory tree into a path containing spaces (e.g.
	C:\Documents and Settings\...) as the configure step will fail.</p>

	</div>

	</div>

	<!-- *********************************************************************** -->
	<h2>
	<a name="quickstart"><b>Getting Started</b></a>
	</h2>
	<!-- *********************************************************************** -->

	<div>

	<p>Here's the short story for getting up and running quickly with LLVM:</p>

	<ol>
	<li>Read the documentation.</li>
	<li>Seriously, read the documentation.</li>
	<li>Remember that you were warned twice about reading the documentation.</li>

	<li>Get the Source Code
	<ul>
	<li>With the distributed files:
	<ol>
	<li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
	<li><tt>gunzip --stdout llvm-<i>version</i>.tar.gz \| tar -xvf -</tt>
	<i>      or use WinZip</i>
	<li><tt>cd llvm</tt></li>
	</ol></li>

	<li>With anonymous Subversion access:
	<ol>
	<li><tt>cd <i>where-you-want-llvm-to-live</i></tt></li>
	<li><tt>svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm</tt></li>
	<li><tt>cd llvm</tt></li>
	</ol></li>
	</ul></li>

	<li> Use <a href="http://www.cmake.org/">CMake</a> to generate up-to-date
	project files:
	<ul>
	<li>Once CMake is installed then the simplest way is to just start the
	CMake GUI, select the directory where you have LLVM extracted to, and the
	default options should all be fine. One option you may really want to
	change, regardless of anything else, might be the CMAKE_INSTALL_PREFIX
	setting to select a directory to INSTALL to once compiling is complete,
	although installation is not mandatory for using LLVM. Another important
	option is LLVM_TARGETS_TO_BUILD, which controls the LLVM target
	architectures that are included on the build.
	<li>See the <a href="CMake.html">LLVM CMake guide</a> for
	detailed information about how to configure the LLVM
	build.</li>
	</ul>
	</li>

	<li>Start Visual Studio
	<ul>
	<li>In the directory you created the project files will have
	an <tt>llvm.sln</tt> file, just double-click on that to open
	Visual Studio.</li>
	</ul></li>

	<li>Build the LLVM Suite:
	<ul>
	<li>The projects may still be built individually, but
	to build them all do not just select all of them in batch build (as some
	are meant as configuration projects), but rather select and build just
	the ALL_BUILD project to build everything, or the INSTALL project, which
	first builds the ALL_BUILD project, then installs the LLVM headers, libs,
	and other useful things to the directory set by the CMAKE_INSTALL_PREFIX
	setting when you first configured CMake.</li>
	<li>The Fibonacci project is a sample program that uses the JIT.
	Modify the project's debugging properties to provide a numeric
	command line argument or run it from the command line. The
	program will print the corresponding fibonacci value.</li>
	</ul></li>

	<li>Test LLVM on Visual Studio:
	<ul>
	<li>If %PATH% does not contain GnuWin32, you may specify LLVM_LIT_TOOLS_DIR
	on CMake for the path to GnuWin32.</li>
	<li>You can run LLVM tests by merely building the project
	"check". The test results will be shown in the VS output
	window.</li>
	</ul>
	</li>

	<!-- FIXME: Is it up-to-date? -->
	<li>Test LLVM:
	<ul>
	<li>The LLVM tests can be run by <tt>cd</tt>ing to the llvm source directory
	and running:

	<div class="doc_code">
	<pre>
	% llvm-lit test
	</pre>
	</div>

	<p>Note that quite a few of these test will fail.</p>
	</li>

	<li>A specific test or test directory can be run with:

	<div class="doc_code">
	<pre>
	% llvm-lit test/path/to/test
	</pre>
	</div>
	</li>
	</ul>
	</ol>

	</div>

	<!-- *********************************************************************** -->
	<h2>
	<a name="tutorial">An Example Using the LLVM Tool Chain</a>
	</h2>
	<!-- *********************************************************************** -->

	<div>

	<ol>
	<li><p>First, create a simple C file, name it 'hello.c':</p>

	<div class="doc_code">
	<pre>
	#include <stdio.h>
	int main() {
	printf("hello world\n");
	return 0;
	}
	</pre></div></li>

	<li><p>Next, compile the C file into a LLVM bitcode file:</p>

	<div class="doc_code">
	<pre>
	% clang -c hello.c -emit-llvm -o hello.bc
	</pre>
	</div>

	<p>This will create the result file <tt>hello.bc</tt> which is the LLVM
	bitcode that corresponds the the compiled program and the library
	facilities that it required. You can execute this file directly using
	<tt>lli</tt> tool, compile it to native assembly with the <tt>llc</tt>,
	optimize or analyze it further with the <tt>opt</tt> tool, etc.</p>

	<p>Alternatively you can directly output an executable with clang with:
	</p>

	<div class="doc_code">
	<pre>
	% clang hello.c -o hello.exe
	</pre>
	</div>

	<p>The <tt>-o hello.exe</tt> is required because clang currently outputs
	<tt>a.out</tt> when neither <tt>-o</tt> nor <tt>-c</tt> are given.</p>

	<li><p>Run the program using the just-in-time compiler:</p>

	<div class="doc_code">
	<pre>
	% lli hello.bc
	</pre>
	</div>

	<li><p>Use the <tt>llvm-dis</tt> utility to take a look at the LLVM assembly
	code:</p>

	<div class="doc_code">
	<pre>
	% llvm-dis < hello.bc \| more
	</pre>
	</div></li>

	<li><p>Compile the program to object code using the LLC code generator:</p>

	<div class="doc_code">
	<pre>
	% llc -filetype=obj hello.bc
	</pre>
	</div></li>

	<li><p>Link to binary using Microsoft link:</p>

	<div class="doc_code">
	<pre>
	% link hello.obj -defaultlib:libcmt
	</pre>
	</div>

	<li><p>Execute the native code program:</p>

	<div class="doc_code">
	<pre>
	% hello.exe
	</pre>
	</div></li>
	</ol>

	</div>

	<!-- *********************************************************************** -->
	<h2>
	<a name="problems">Common Problems</a>
	</h2>
	<!-- *********************************************************************** -->

	<div>

	<p>If you are having problems building or using LLVM, or if you have any other
	general questions about LLVM, please consult the <a href="FAQ.html">Frequently
	Asked Questions</a> page.</p>

	</div>

	<!-- *********************************************************************** -->
	<h2>
	<a name="links">Links</a>
	</h2>
	<!-- *********************************************************************** -->

	<div>

	<p>This document is just an <b>introduction</b> to 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
	out:</p>

	<ul>
	<li><a href="http://llvm.org/">LLVM homepage</a></li>
	<li><a href="http://llvm.org/doxygen/">LLVM doxygen tree</a></li>
	</ul>

	</div>

	<!-- *********************************************************************** -->

	<hr>
	<address>
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	src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>

	<a href="http://llvm.org/">The LLVM Compiler Infrastructure</a><br>
	Last modified: $Date$
	</address>
	</body>
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