libstdc++ : shared lib names

[Oleg Smolsky]

Hey all, I have a question about running multiple compilers concurrently 
on a single OS. Here is what I do:
  - configure gcc 4.7.0 with --prefix=/work/tools/gcc47
  - build and install
  - reference /work/tools/gcc47/lib64 in /etc/ld.so.conf.d/gcc47-x86_64.conf

This, however, forces the new version of libstdc++.so onto binaries that 
are built with the system compiler. Normally that works, but we have 
just hit an issue where std::stringstream::tellg() returns a different 
value after extracting an "int". (the system compiler is  4.4.5 20110214 
(Red Hat 4.4.5-6))

So, is there a way to build gcc and force a bump in the .so version? 
This way I could keep environments completely distinct when using shared 
libs (the issue goes away when statically linking the runtime)

Thanks!
Oleg.