gcc 3.4 snapshots currently have problems compiling packages like
cppunit.  I just checked snapshot 3.4.0 20040303 (prerelease)
and this problem is still there.
Here's a simplified example of the problem, I hope this i helpful.

// test code

class TestFailure {
private:
  TestFailure(const TestFailure &);
public:
  TestFailure(int *p);
};

void dummy(const TestFailure &failure);

void usingfunc(int *intp) {
  // this:
  { TestFailure foo(intp);
    dummy(foo);
  }
  // should be the same as this
  dummy( TestFailure(intp) );
}

produces this error:

t.cpp: In function `void usingfunc(int*)':
t.cpp:5: error: `TestFailure::TestFailure(const TestFailure&)' is private
t.cpp:18: error: within this context

Full output from gcc -v -c t.cpp:

Reading specs from /snapshot/lib/gcc/i386-unknown-freebsd4.9/3.4.0/specs
Configured with: ./configure --prefix=/snapshot
Thread model: posix
gcc version 3.4.0 20040303 (prerelease)
 /snapshot/libexec/gcc/i386-unknown-freebsd4.9/3.4.0/cc1plus -quiet -v t.cpp 
-quiet -dumpbase t.cpp -auxbase t -version -o /var/tmp//ccuJ8mOU.s
ignoring nonexistent directory "/snapshot/lib/gcc/i386-unknown-freebsd4.9/3.4.
0/../../../../i386-unknown-freebsd4.9/include"
#include "..." search starts here:
#include <...> search starts here:
 /snapshot/lib/gcc/i386-unknown-freebsd4.9/3.4.0/../../../../include/c++/3.4.0
 /snapshot/lib/gcc/i386-unknown-freebsd4.9/3.4.0/../../../../include/c++/3.4.
0/i386-unknown-freebsd4.9
 /snapshot/lib/gcc/i386-unknown-freebsd4.9/3.4.0/../../../../include/c++/3.4.
0/backward
 /usr/local/include
 /snapshot/include
 /snapshot/lib/gcc/i386-unknown-freebsd4.9/3.4.0/include
 /usr/include
End of search list.
GNU C++ version 3.4.0 20040303 (prerelease) (i386-unknown-freebsd4.9)
        compiled by GNU C version 2.95.4 20020320 [FreeBSD].
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=130534
t.cpp: In function `void usingfunc(int*)':
t.cpp:5: error: `TestFailure::TestFailure(const TestFailure&)' is private
t.cpp:18: error: within this context