llvm dev - Feb 2012 - [LLVMdev] Getting corresponding c-instruction line number along with ir-instruction in a function's CFG

Hi
I am not a good programmer but for my project i have to use llvm to generate CFG
for c programs where i have a mapping from IR instruction in CFG to their
respective c instruction. After surfing a in source of llvm i did the following
change in printInstruction() function in llvm/lib/VMCore/AsmWriter.cpp file. 
.....void AssemblyWriter::printInstruction(const Instruction &I) {  if
(AnnotationWriter) AnnotationWriter->emitInstructionAnnot(&I, Out);
  // Print out indentation for an instruction.  Out << "  ";    
if (MDNode *N = I.getMetadata("dbg")) {  			// Code   DILocation
Loc(N);                                			// inserted    unsigned Line =
Loc.getLineNumber();					// by    Out<<"LN@"<<Line;						
// me   StringRef File = Loc.getFilename();					// to   
Out<<"FN@"<<File;							// get    StringRef Dir =
Loc.getDirectory();					// the   Out<<"DN@"<<Dir;							//
mapping }									//
  // Print out name if it exists........Code compiles well but i get following
linking problem :(llvm[2]: Linking Debug+Asserts executable
llvm-as/home/rangi/llvm/build/Debug+Asserts/lib/libLLVMCore.a(AsmWriter.o): In
function `llvm::DIDescriptor::getUnsignedField(unsigned int)
const':/home/rangi/llvm/include/llvm/Analysis/DebugInfo.h:70: undefined
reference to `llvm::DIDescriptor::getUInt64Field(unsigned int)
const'/home/rangi/llvm/build/Debug+Asserts/lib/libLLVMCore.a(AsmWriter.o):
In function
`DIScope':/home/rangi/llvm/include/llvm/Analysis/DebugInfo.h:160: undefined
reference to `vtable for
llvm::DIScope'/home/rangi/llvm/build/Debug+Asserts/lib/libLLVMCore.a(AsmWriter.o):
In function
`~DIScope':/home/rangi/llvm/include/llvm/Analysis/DebugInfo.h:161: undefined
reference to `vtable for
llvm::DIScope'/home/rangi/llvm/build/Debug+Asserts/lib/libLLVMCore.a(AsmWriter.o):
In function `llvm::DILocation::getFilename()
const':/home/rangi/llvm/include/llvm/Analysis/DebugInfo.h:785: undefined
reference to `llvm::DIScope::getFilename()
const'/home/rangi/llvm/build/Debug+Asserts/lib/libLLVMCore.a(AsmWriter.o):
In function `llvm::DILocation::getDirectory()
const':/home/rangi/llvm/include/llvm/Analysis/DebugInfo.h:786: undefined
reference to `llvm::DIScope::getDirectory()
const'/home/rangi/llvm/build/Debug+Asserts/lib/libLLVMCore.a(AsmWriter.o):
In function `llvm::DIScope
llvm::DIDescriptor::getFieldAs<llvm::DIScope>(unsigned int)
const':/home/rangi/llvm/include/llvm/Analysis/DebugInfo.h:77: undefined
reference to `llvm::DIDescriptor::getDescriptorField(unsigned int) const'
Plese tell me if what is missing and if this the right way to achive
mapping.Thanks in advance Patreek
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