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Update this to reflect llvm-config usage

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llvm-svn: 30094
This commit is contained in:
Chris Lattner 2006-09-04 06:12:14 +00:00
parent e160871264
commit 5188877ecc
1 changed files with 10 additions and 24 deletions
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34
docs/MakefileGuide.html
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@ -297,7 +297,7 @@
<pre><tt>
LIBRARYNAME := MyMod
LOADABLE_MODULE := 1
USEDLIBS := LLVMSupport.a LLVMSystem.a
LINK_COMPONENTS := support system
</tt></pre>
<p>Use of the <tt>LOADABLE_MODULE</tt> facility implies several things:</p>
<ol>
@ -323,7 +323,7 @@
<pre><tt>
TOOLNAME = mytool
USEDLIBS = mylib
LLVMLIBS = LLVMSupport.a LLVMSystem.a
LINK_COMPONENTS = support system
</tt></pre>
<p>says that we are to build a tool name <tt>mytool</tt> and that it requires
three libraries: <tt>mylib</tt>, <tt>LLVMSupport.a</tt> and
@ -352,36 +352,22 @@
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="JIT">JIT Tools</a></div>
<div class="doc_text">
<p>Many tools will want to use the JIT features of LLVM. However, getting the
right set of libraries to link with is tedious, platform specific, and error
prone. Additionally, the JIT has special linker switch options that it needs.
Consequently, to make it easier to build tools that use the JIT, you can
use a special value for the <tt>LLVMLIBS</tt> variable:</p>
<p>Many tools will want to use the JIT features of LLVM. To do this, you
simply specify that you want an execution 'engine', and the makefiles will
automatically link in the appropriate JIT for the host or an interpreter
if none is available:</p>
<pre><tt>
TOOLNAME = my_jit_tool
USEDLIBS = mylib
LLVMLIBS = JIT
LINK_COMPONENTS = engine
</tt></pre>
<p>Using a value of <tt>JIT</tt> for <tt>LLVMLIBS</tt> tells the makefile
system to construct a special value for LLVMLIBS that gives the program all
the LLVM libraries needed to run the JIT. Any additional libraries needed can
still be specified with <tt>USEDLIBS</tt>. To get a full understanding of how
this changes the linker command, it is recommended that you:</p>
<p>Of course, any additional libraries may be listed as other components. To
get a full understanding of how this changes the linker command, it is
recommended that you:</p>
<pre><tt>
cd examples/Fibonacci
make VERBOSE=1
</tt></pre>
<p>By default, using <tt>LLVMLIBS=JIT</tt> will link in enough to support JIT
code generation for the architecture on which the tool is linked. If you need
additional target architectures linked in, you may specify them on the command
line or in your <tt>Makefile</tt>. For example:</p>
<pre><tt>
ENABLE_X86_JIT=1
ENABLE_SPARCV9_JIT=1
ENALBE_PPC_JIT=1
</tt></pre>
<p>will cause the tool to be able to generate code for all three platforms.
</p>
</div>
<!-- *********************************************************************** -->