GCC Compatibility in C++

[Shlomit Morad]

Orbotech is using GCC for C++ version 3.4.3 on Fedora 5
We want to move to GCC version 4.1.1 on Fedora 6 or Centos
 
I looked for any binary compatible statement between 3.x and 4.y but I
didn't find any.
A found some Q&A that are somewhat ambiguous 
 
Can you direct me to (or send me) a formal statement ?
 
Regards
Shlomit

Shlomit Morad
Software Department Manager
R&D Infrastructures
Orbotech Ltd.
P.O.Box 215 Yavne 81102, Israel
Tel: +972- 8 - 9423718
Fax: +972 - 8 - 9423250
www.orbotech.com