the gdb info "Contributors" page reads:
"GDB uses the BFD subroutine library to examine multiple object-file
formats; BFD was a joint project of David V. Henkel-Wallace, Rich
Pixley, Steve Chamberlain, and John Gilmore."
i don't think gdb uses the BFD libs anymore. those libs are part of the
binutils-devel package, which are not a prereq of gdb, as far as i can tell.
gdb-X-Y.src.rpm contains gdb-X.Y.tar.bz2 which contains gdb-X.y/bfd subdirectory
containing the BFD library.
GDB functionality is based on the BFD library.
Due to a complicated API/ABI compatibility of BFD it is bundled with each
package separately - both with GDB and with BINUTILS.
It is built statically with GDB so you do not see it even by ldd(1).