[llvm-dev] compile Hello LLVM Pass in the source tree

[mudongliang via llvm-dev]

I have seen this webpage :
http://llvm.org/docs/WritingAnLLVMPass.html#quick-start-writing-hello-world

But this webpage may be a little older. There is Makefile in
lib/Transforms/Hello. The content is a little different from the website.
And I am confused about the sentence - "First, configure and build LLVM.
This needs to be done directly inside the LLVM source tree rather than
in a separate objects directory."! I get from the wiki : LLVM should be
installed outside the LLVM source tree. (in-tree build is not supported)

    -mudongliang
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