These options control whether debug information is generated for all source symbols, or only for those source symbols actually used.
--remove_unneeded_entities to reduce
the amount of debug information in an ELF object. Faster linkage
times can also be achieved.
help to reduce the amount of debug information generated per file,
it has the disadvantage of reducing the number of debug sections
that are common to many files. This reduces the number of common
debug sections that the linker is able to remove at final link time,
and can result in a final debug image that is larger than necessary.
For this reason, use