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Update information on canadian cross builds

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69358 91177308-0d34-0410-b5e6-96231b3b80d8
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Jim Grosbach 2009-04-17 17:25:16 +00:00
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docs/GettingStarted.html
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@ -1036,43 +1036,16 @@ that directory that is out of date.</p>
</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>
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