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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74485 91177308-0d34-0410-b5e6-96231b3b80d8
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Mikhail Glushenkov 2009-06-30 00:16:43 +00:00
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@ -37,6 +37,7 @@ The ReST source lives in the directory 'tools/llvmc/doc'. -->
<li><a class="reference internal" href="#hooks-and-environment-variables" id="id17">Hooks and environment variables</a></li>
<li><a class="reference internal" href="#how-plugins-are-loaded" id="id18">How plugins are loaded</a></li>
<li><a class="reference internal" href="#debugging" id="id19">Debugging</a></li>
<li><a class="reference internal" href="#conditioning-on-the-executable-name" id="id20">Conditioning on the executable name</a></li>
</ul>
</li>
</ul>
@ -94,9 +95,8 @@ $ llvmc --linker=c++ hello.o
$ ./a.out
hello
</pre>
<p>By default, LLVMC uses <tt class="docutils literal"><span class="pre">llvm-gcc</span></tt> to compile the source code. It is
also possible to choose the work-in-progress <tt class="docutils literal"><span class="pre">clang</span></tt> compiler with
the <tt class="docutils literal"><span class="pre">-clang</span></tt> option.</p>
<p>By default, LLVMC uses <tt class="docutils literal"><span class="pre">llvm-gcc</span></tt> to compile the source code. It is also
possible to choose the <tt class="docutils literal"><span class="pre">clang</span></tt> compiler with the <tt class="docutils literal"><span class="pre">-clang</span></tt> option.</p>
</div>
<div class="section" id="predefined-options">
<h1><a class="toc-backref" href="#id6">Predefined options</a></h1>
@ -633,6 +633,27 @@ be performed at compile-time because the plugins can load code
dynamically. When invoked with <tt class="docutils literal"><span class="pre">--check-graph</span></tt>, <tt class="docutils literal"><span class="pre">llvmc</span></tt> doesn't
perform any compilation tasks and returns the number of encountered
errors as its status code.</p>
</div>
<div class="section" id="conditioning-on-the-executable-name">
<h2><a class="toc-backref" href="#id20">Conditioning on the executable name</a></h2>
<p>For now, the executable name (the value passed to the driver in <tt class="docutils literal"><span class="pre">argv[0]</span></tt>) is
accessible only in the C++ code (i.e. hooks). Use the following code:</p>
<pre class="literal-block">
namespace llvmc {
extern const char* ProgramName;
}
std::string MyHook() {
//...
if (strcmp(ProgramName, &quot;mydriver&quot;) == 0) {
//...
}
</pre>
<p>In general, you're encouraged not to make the behaviour dependent on the
executable file name, and use command-line switches instead. See for example how
the <tt class="docutils literal"><span class="pre">Base</span></tt> plugin behaves when it needs to choose the correct linker options
(think <tt class="docutils literal"><span class="pre">g++</span></tt> vs. <tt class="docutils literal"><span class="pre">gcc</span></tt>).</p>
<hr />
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