[cfe-users] Why re-compile clang with clang?

[Pratyush Das via cfe-users]

Hi,

I noticed here -
https://clang.llvm.org/docs/LibASTMatchersTutorial.html#step-0-obtaining-clang
that
it is recommended to recompile clang after building it for the first time
with itself. Why is that required?

Thanks,

-- 
Pratyush Das(Reik)
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