<p>To emphasize, there is no C/C++ front end currently available.
<tt>llvm-gcc</tt> is based on GCC, which cannot be bootstrapped using VC++.
Eventually there should be a <tt>llvm-gcc</tt> based on Cygwin or MinGW that
- is usable. There is also the option of generating bytecode files on Unix and
+ is usable. There is also the option of generating bitcode files on Unix and
copying them over to Windows. But be aware the odds of linking C++ code
compiled with <tt>llvm-gcc</tt> with code compiled with VC++ is essentially
zero.</p>
<li><tt>cd llvm</tt></li>
</ol></li>
- <li>With anonymous CVS access (or use a <a href="#mirror">mirror</a>):
+ <li>With anonymous Subversion access:
<ol>
<li><tt>cd <i>where-you-want-llvm-to-live</i></tt></li>
- <li><tt>cvs -d
- :pserver:anon@llvm-cvs.cs.uiuc.edu:/var/cvs/llvm login</tt></li>
- <li>Hit the return key when prompted for the password.
- <li><tt>cvs -z3 -d :pserver:anon@llvm-cvs.cs.uiuc.edu:/var/cvs/llvm
- co llvm</tt></li>
+ <li><tt>svn co http://llvm.org/svn/llvm-project/llvm-top/trunk llvm-top
+ </tt></li>
+ <li><tt>make checkout MODULE=llvm</tt>
<li><tt>cd llvm</tt></li>
- <li><tt>cvs up -P -d</tt></li>
</ol></li>
</ul></li>
</ol>
-<p>It is strongly encouraged that you get the latest version from CVS. Much
-progress has been made since the 1.4 release.</p>
+<p>It is strongly encouraged that you get the latest version from Subversion as
+changes are continually making the VS support better.</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>
+ <li><p>Next, compile the C file into a LLVM bitcode file:</p>
+ <p><tt>% llvm-gcc -c hello.c -emit-llvm -o hello.bc</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>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><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 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>% cl hello.cbe.c</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>Execute the native code program:</p>
<p><tt>% hello.cbe.exe</tt></p></li>
projects / oota-llvm.git / blobdiff