Ezrec, can I ask what C and C++ standard libraries you are using?
I've built GCC 4.8.2 and the binutils for m68k-elf cross target, but from what I gather there was never an m68k-amigaos port of glibc, and I can't seem to find the last version of libstdc++ that still targeted m68k-amigaos, making my 4.8.2 build less useful. Any pointers?