Compiling own project results in much more errors than before

[Roesner Thomas]

Dear all,

yesterday I mad an update to gcc 4.02 (prev. 3.3.x). Unfortunately now I cant compile my project without a few new errors. With the old version of gcc I had some warnings, but now i get some errors. 

Because of different responsibilities I cant fix the "errors" at once, but i´d like to use gcc4.
 
Is there an option  to use gcc 4 in a compatible way to compile without these "new" errors? 
Many Thanks!

Kind Regards
Thomas Roesner