GCC ABI compatibility
Solution 1:
Since gcc-3.4.0, the ABI is forward compatible. I.E. a library made using an older release can be linked with a newer one and it should work (the reverse doesn't). Obviously, there could be bugs, but there is only one mentionned in the documentation: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33678
Solution 2:
The official ABI page points to an ABIcheck. This tool may do, what you want.