<li><tt>cd llvm</tt></li>
</ol></li>
- <li>With anonymous CVS access (or use a <a href="#mirror">mirror</a>):
+ <li>With anonymous CVS access:
<ol>
<li><tt>cd <i>where-you-want-llvm-to-live</i></tt></li>
<li><tt>cvs -d
beta, there are no guarantees and there is no support for it at this time.
It has been reported that VC++ Express also works.</p>
- <p>You will also need several open source packages: bison, flex, and sed.
- These must be installed in <tt>llvm/win32/tools</tt>. These can be found at
- <a href="http://gnuwin32.sourceforge.net">http://gnuwin32.sourceforge.net</a>
- or
- <a href="http://unxutils.sourceforge.net">http://unxutils.sourceforge.net</a>.
- Bison prefers that m4 be in the path. You must add it to the Visual Studio
- configuration under the menu Options -> Projects -> VC++ Directories.
- Alternatively, you can set the environment variable <tt>M4</tt> to point to
- <tt>m4</tt> executable.</p>
+ <p>If you plan to modify any .y or .l files, you will need to have bison
+ and/or flex installed where Visual Studio can find them. Otherwise, you do
+ not need them and the pre-generated files that come with the source tree
+ will be used.</p>
</div>
</pre></li>
<li><p>Next, compile the C file into a LLVM bytecode file:</p>
- <p><tt>% llvm-gcc hello.c -o hello</tt></p>
-
- <p>Note that you should have already built the tools and they have to be
- in your path, at least <tt>gccas</tt> and <tt>gccld</tt>.</p>
-
- <p>This will create two result files: <tt>hello</tt> and
- <tt>hello.bc</tt>. The <tt>hello.bc</tt> is the LLVM bytecode that
- corresponds the the compiled program and the library facilities that it
- required. <tt>hello</tt> is a simple shell script that runs the bytecode
- file with <tt>lli</tt>, making the result directly executable. Note that
- all LLVM optimizations are enabled by default, so there is no need for a
- "-O3" switch.</p>
+ <p><tt>% llvm-gcc -c hello.c -emit-llvm -o hello.bc</tt></p>
+
+ <p>This will create the result file <tt>hello.bc</tt> which is the LLVM
+ bytecode 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><b>Note: while you cannot do this step on Windows, you can do it on a
- Unix system and transfer <tt>hello.bc</tt> to Windows.</b></p></li>
+ Unix system and transfer <tt>hello.bc</tt> to Windows. Important:
+ transfer as a binary file!</b></p></li>
- <li><p>Run the program. To make sure the program ran, execute the
- following command:</p>
+ <li><p>Run the program using the just-in-time compiler:</p>
<p><tt>% lli hello.bc</tt></p></li>
+ <p>Note: this will only work for trivial C programs. Non-trivial programs
+ (and any C++ program) will have dependencies on the GCC runtime that
+ won't be satisfied by the Microsoft runtime libraries.</p>
+
<li><p>Use the <tt>llvm-dis</tt> utility to take a look at the LLVM assembly
code:</p>
- <p><tt>% llvm-dis < hello.bc | less</tt><p></li>
+ <p><tt>% llvm-dis < hello.bc | more</tt><p></li>
+
+ <li><p>Compile the program to C using the LLC code generator:</p>
- <li><p>Compile the program to native assembly using the LLC code
- generator:</p>
+ <p><tt>% llc -march=c hello.bc</tt></p></li>
- <p><tt>% llc hello.bc -o hello.s</tt></p>
+ <li><p>Compile to binary using Microsoft C:</p>
- <li><p>Assemble the native assembly language file into a program:</p>
+ <p><tt>% cl hello.cbe.c</tt></p></li>
- <p><b>Not currently possible, but eventually will use <tt>NASMW</tt>.</b></p>
+ <p>Note: this will only work for trivial C programs. Non-trivial programs
+ (and any C++ program) will have dependencies on the GCC runtime that
+ won't be satisfied by the Microsoft runtime libraries.</p>
<li><p>Execute the native code program:</p>
- <p><tt>% ./hello.native</tt></p></li>
+ <p><tt>% hello.cbe.exe</tt></p></li>
</ol>
out:</p>
<ul>
- <li><a href="http://llvm.cs.uiuc.edu/">LLVM homepage</a></li>
- <li><a href="http://llvm.cs.uiuc.edu/doxygen/">LLVM doxygen tree</a></li>
- <li><a href="http://llvm.cs.uiuc.edu/docs/Projects.html">Starting a Project
+ <li><a href="http://llvm.org/">LLVM homepage</a></li>
+ <li><a href="http://llvm.org/doxygen/">LLVM doxygen tree</a></li>
+ <li><a href="http://llvm.org/docs/Projects.html">Starting a Project
that Uses LLVM</a></li>
</ul>
src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
<a href="mailto:jeffc@jolt-lang.org">Jeff Cohen</a><br>
- <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
+ <a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
Last modified: $Date$
</address>
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