mach writes in bug 685:

The last revision of gcc-3.4.4 patch file 100-uclibc-conf.patch builds file unwind-dw2-fde-glibc.c into libgcc (at least on mipsel-linux-uclibc and arm-linux-uclibc, but it should be the same on most architectures).

this is due to the simplification of the uclibc patch ... simplified a little too much :)