Shlomit Morad writes: > > 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 ? The issue here is the C++ library. The compilers should generate binary-compatible code, but the programs will probably be linked against different C++ libraries. Have a look at /usr/lib/libstdc++.so on your old system: it's a symbolic link to a library with a version name. Now have a look at /usr/lib/libstdc++.so on the new system. Andrew.