Which files xcode4 install in the Mac system?

I just intalled xcode4 in mac pro. How can I check which files are installe开发者_开发百科d from in the system?

There are two clang in the systems. One is in /usr/bin, and another is in /Developer/usr/bin/. Why the system maintain two copies?

The same as many other tools such as svn, llvm-gcc, yacc and so on. They both have two copies in /usr/bin and /Developer/usr/bin.

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The developer tools are installed into /Developer. Due to historical and unixy reasons some of the tools are also installed into /usr to be consistent with existing practice.