Compatibility between object code of gcc versions

[Luís Carlos Carneiro Gonçalves]

Dear all

    I am some old programs compiled in gcc  (“.o”) that I 
do not have source code. If I link with others compiled 
with gcc 3.2.1 will it work?

(I will call the old code from the new code)

(gcc for linux x86)

Thanks

Luis Gonçalves