mixing gcc-4.0 and g++-3.3 generated code

[Jack Howarth]

    The Fink project has adopted the use of the g++-3.3 compiler
as their default for compiling fink packages under MacOS X 10.4.
However they are allowing the default gcc compiler to remain as
gcc-4.0. Are there likely to be any odd issues with mixing code
from the two compiler generations? In particular, I wonder if
there are likely to be any symbols in gcc-4.0 generated code
that the g++-3.3 compiler would have problems resolving if it
were used to do the final linking of such mixed object code.
Thanks in advance for any advice.
              Jack