How to deal with such reference situation(reference to another project)?

My repository layout is such like
proj1 proj2
 |---protocol |--

proj2 is dependent with proj1, now in proj2 I need to use protocol code and modify from it. If I only copy code from proj1->protocol directory to proj2, and If I found bugs in the code I can merge bugfix from proj2 to proj1, but I can't see revision infomation of protocol already has in proj1.
So what's the best practice?

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Received on 2010-12-11 02:52:01 CET