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<div class="moz-cite-prefix">On 1/6/16 9:41 AM, Kai Wang via
llvm-dev wrote:<br>
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<div>Hi all,</div>
<div><br>
</div>
<div>I'm trying to generate whole program bitcode files for
linux kernel and do <span>interprocedural analysis on
kernel.</span></div>
<div><span><br>
</span></div>
<div><span>I use llvmlinux to compile kernel with clang and
generate a bunch of bitcode files successfully.</span></div>
<div><span>I need to link all these bitcode files together
into a single bitcode file, so that I can run whole
program analysis. </span></div>
<div><span><br>
</span></div>
<div><span>Should I use l</span><span>ibLTO</span><span> to
link all these bitcode files together? I guess I have to
modify the linux kernel's build scripts and Makefiles?</span></div>
<div>I'm kind of confused. Any suggestions?</div>
</div>
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<br>
There are two ways to do it.<br>
<br>
First, you can use llvm-link to link the bitcode files together.
This will require some manual changes to the Linux Makefiles. Once
you get a single bitcode file, you can run your analysis pass via
opt. This is the approach that I used for the original SVA system
for Linux 2.4.22 back before we had libLTO.<br>
<br>
Second, you could add your pass to libLTO and change the Linux
Makefiles to use the -flto option. This method should require fewer
Makefile changes but will require you to build and install your own
libLTO library.<br>
<br>
Regards,<br>
<br>
John Criswell<br>
<br>
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<div>Thank you</div>
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<div dir="ltr">Regards,
<div>Kai</div>
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<pre class="moz-signature" cols="72">--
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
<a class="moz-txt-link-freetext" href="http://www.cs.rochester.edu/u/criswell">http://www.cs.rochester.edu/u/criswell</a></pre>
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