> You may need to clarify what you mean by compatibility. > As you will have installed a newer version of gcc and g++/gfortran or > whichever compilers you will need, your tools will work as long as you use > the new compilers for the applications. Your new C language .o files > probably will work with the old gcc also, but your g++ and gfortran libraries > will require the new installations. > > -- > Tim Prince OK, let me clarify. We build "tool chains" that start with a specify gcc compiler version and then build everything with that one compiler. Currently, we only have 1 tool chain. It is based on the GCC 4.1.2 that ships with SLES10. Now, I would like to build another tool chain, starting with GCC 4.5. I intend to rebuild all of our existing tools and applications with GCC 4.5. However, I was not sure if that will work since many of these packages link against system libraries. I believe all of the system libraries were built with GCC 4.1.2. So, I guess my question is this. Can I create another tool chain based on GCC 4.5 if they will be using some components that were built with GCC 4.1.2 ? Kris