Oh, This will not a issue. Just like the C compiler is writen using C language.
More, it is a popular interesting thing, such as: 1. the Smalltalk VM(such as www.squeak.org <http://www.squeak.org>) is writen using smalltalk 2. the GHC compiler which process haskell language is writen using haskell. 3. also, the javac is also writen using java.
