There is a bug in g++ version 4.3.0 which causes incomplete types to be sent to functions by value. In testing today, I found that this was fixed in version 4.3.1. Could anyone direct me to where this was fixed at? I've been reading through the svn log and diff, but I haven't located it, yet. Here is an example of what should error when compiling, but does not using `g++ -c file.cpp` in version 4.3.0. struct A; void foo(A); void bar(A* p){foo(*p);} Thank you, Anthony