This file is included several times in a row, once

for each element of $(object-suffixes). $(object-suffixes-left)

is initialized first to $(object-suffixes) so that with each

inclusion, we advance $o to the next suffix.

o := $(firstword $(object-suffixes-left)) object-suffixes-left := $(filter-out $o,$(object-suffixes-left))

$(o-iterator-doit)