Gentoo's Bugzilla –
Attachment 351078 Details for
Bug 473456cross-armv6j-hardfloat-linux-gnueabi/glibc-2.15-r3 - ...//work/build-default-armv6j-hardfloat-linux-gnueabi-nptl/libc.a(vf printf.o): In function `vfprintf': vfprintf.c:(.text+0x30b4): undefined reference to `_Unwind_Resume'