[LLVMdev] installation query

[amruth.rd at knights.ucf.edu]

Hello everyone,
I am a newbie to LLVM and I am trying to develop an LLVM pass. I came across this page "Writing an LLVM Pass" which said, "First, configure and build LLVM. This needs to be done directly inside the LLVM source tree rather than in a separate objects directory. "
where as LLVM installation page says to have a separate build directory for putting all the binaries. I am trying to understand why this distinction of having to build LLVM inside source when debuggers can still refer to the source files from build directory? 
Please correct me if I am wrong. 
Thanks,Amruth 		 	   		  
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