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Correct a misunderstanding about cross-compiling. Anton's changes don't

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cause LLVM to become a cross-compiler but rather cross-compile LLVM so that
it can execute on a platform other than the build host.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29339 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2006-07-27 06:41:31 +00:00
parent 33e9ad96c8
commit d30a971bf2
1 changed files with 13 additions and 8 deletions
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21
docs/GettingStarted.html
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@ -31,7 +31,7 @@
<li><a href="#installcf">Install the GCC Front End</a> <li><a href="#installcf">Install the GCC Front End</a>
<li><a href="#config">Local LLVM Configuration</a> <li><a href="#config">Local LLVM Configuration</a>
<li><a href="#compile">Compiling the LLVM Suite Source Code</a> <li><a href="#compile">Compiling the LLVM Suite Source Code</a>
<li><a href="#cross-compile">Compiling LLVM As A Cross-Compiler</a> <li><a href="#cross-compile">Cross-Compiling LLVM</a>
<li><a href="#objfiles">The Location of LLVM Object Files</a> <li><a href="#objfiles">The Location of LLVM Object Files</a>
<li><a href="#optionalconfig">Optional Configuration Items</a> <li><a href="#optionalconfig">Optional Configuration Items</a>
</ol></li> </ol></li>
@ -989,15 +989,17 @@ that directory that is out of date.</p>
<!-- ======================================================================= --> <!-- ======================================================================= -->
<div class="doc_subsection"> <div class="doc_subsection">
<a name="cross-compile">Compiling LLVM as a Cross-compiler</a> <a name="cross-compile">Cross-Compiling LLVM</a>
</div> </div>
<div class="doc_text"> <div class="doc_text">
<p>LLVM can be built as a cross-compiler, however some additional steps are <p>It is possible to cross-compile LLVM. That is, you can create LLVM
required.<sup><a href="#ccn_1">1</a></sup> To build a cross-compiler, use 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> these instructions:</p>
<ol> <ol>
<li>Configure and build LLVM Suite as a native compiler. You will need <li>Configure and build LLVM as a native compiler. You will need
just <tt>TableGen</tt> from that build. just <tt>TableGen</tt> from that build.
<ul> <ul>
<li>If you have <tt>$LLVM_OBJ_ROOT=$LLVM_SRC_ROOT</tt> just execute <li>If you have <tt>$LLVM_OBJ_ROOT=$LLVM_SRC_ROOT</tt> just execute
@ -1008,15 +1010,18 @@ that directory that is out of date.</p>
</li> </li>
<li>Copy the TableGen binary to somewhere safe (out of your build tree). <li>Copy the TableGen binary to somewhere safe (out of your build tree).
</li> </li>
<li>Configure LLVM to build as a cross-compiler. To do this, supply the <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 configure script with <tt>--build</tt> and <tt>--host</tt> options that
are different. The values of these options must be legal target triples and are different. The values of these options must be legal target triples
should specify a processor for which LLVM supports code generation.</li> that your GCC compiler supports.</li>
<li>Put the saved <tt>TableGen</tt> executable into the <li>Put the saved <tt>TableGen</tt> executable into the
into <tt>$LLVM_OBJ_ROOT/{BUILD_TYPE}/bin</tt> directory (e.g. into into <tt>$LLVM_OBJ_ROOT/{BUILD_TYPE}/bin</tt> directory (e.g. into
<tt>.../Release/bin</tt> for a Release build).</li> <tt>.../Release/bin</tt> for a Release build).</li>
<li>Build LLVM as usual.</li> <li>Build LLVM as usual.</li>
</ol> </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
(--host option).</p>
<p><b>Notes:</b></p> <p><b>Notes:</b></p>
<div class="doc_notes"> <div class="doc_notes">
<ol> <ol>