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<div>Ah, I just tried with a properly written project and everything worked smoothly. Thanks John.</div>
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<span style="font-weight:bold">From: </span>John Criswell <<a href="mailto:criswell@illinois.edu">criswell@illinois.edu</a>><br>
<span style="font-weight:bold">Organization: </span>University of Illinois<br>
<span style="font-weight:bold">Date: </span>Thu, 22 Sep 2011 16:08:31 -0500<br>
<span style="font-weight:bold">To: </span>Jinwook Shin <<a href="mailto:Jinwook.Shin@microsoft.com">Jinwook.Shin@microsoft.com</a>><br>
<span style="font-weight:bold">Cc: </span>"<a href="mailto:llvmdev@cs.uiuc.edu">llvmdev@cs.uiuc.edu</a>" <<a href="mailto:llvmdev@cs.uiuc.edu">llvmdev@cs.uiuc.edu</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [LLVMdev] running a module pass via opt on multiple bitcode files<br>
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<div bgcolor="#FFFFFF" text="#000000">On 9/22/11 4:04 PM, Jinwook Shin wrote:
<blockquote cite="mid:CAA0ECBE.14270%25jinshin@microsoft.com" type="cite">
<div>Thanks John. I appreciate your help. <br>
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De nada.<br>
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<blockquote cite="mid:CAA0ECBE.14270%25jinshin@microsoft.com" type="cite">
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<div>I have taken the libLTO approach and it worked like a charm :) For those who wanted to achieve the same thing, below are the steps I've taken. </div>
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<div>John -- a small question: I thought I wouldn't need to touch Makefiles at all, but that wasn't the case. Could you take a look at Step 4) and tell me what you think? Thanks!
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A properly written project will allow the person compiling the software to easily change the compiler and the compiler/linker flags used.<br>
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For example, autoconf-based configure scripts usually use the following environment variables:<br>
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CC - C compiler<br>
CXX - C++ compiler<br>
CFLAGS - compiler flags<br>
LDFLAGS - linker flags<br>
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So, you would do the following in sh/ksh syntax:<br>
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CC=llvm-gcc<br>
CXX=llvm-g++<br>
CFLAGS="-emit-llvm"<br>
export CC<br>
export CXX<br>
export CFLAGS<br>
./configure<br>
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<blockquote cite="mid:CAA0ECBE.14270%25jinshin@microsoft.com" type="cite">
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<div>1) Create your own libLTO and add your pass to it. Do a code diff between /safecode/tools/LTO/LTOCodeGenerator.cpp and /llvm/tools/lto/LTOCodeGenerator.cpp to figure out what changes are needed to do this.</div>
<div>2) Make a backup copy of the original linker /usr/lib/libLTO.dylib.</div>
<div>3) Copy your libLTO.dylib to /usr/lib.</div>
<div>4) Open Makefiles in your target project and change CC and CFLAGS as follows: </div>
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<div><span class="Apple-tab-span" style="white-space:pre"></span>CC=llvm-gcc</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>CFLAGS=-emit-llvm …</div>
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<div>5) Build the project with LLVM.</div>
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-- John T.<br>
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