Unfortunately, there is no good way to attach FD lenses to the newer Canon mounts.
To mount a Canon FD lens to an EF mount you need an adapter, the only ones available use glass elements, which results in degraded photo quality. If you want to use full manual lenses on a Canon body, buy old Nikon lenses and an adapter for Nikon to Canon EF.
Because of the way Nikon lenses are made, the adapter for those lenses has no glass and therefore does not reduce photographic quality.