It was a.out to ELF, there was separate stabs to DWARF migration afaik related to how debugging info was stored. For me, the biggest migration pain was being a

It was a.out to ELF, there was separate stabs to DWARF migration afaik related to how debugging info was stored. For me, the biggest migration pain was being a heavy KDE user in the middle of GCC 2.95 -> GCC 3.0 migration, with my Debian unstable (in between woody and sarge, iirc) getting into state where half of the C++ code was compiled with 2.95, and half with 3.0...