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--gc-sections
--no-gc-sections

Enable garbage collection of unused input sections. It is ignored on targets
that do not support this option. The default behaviour (of not performing this
garbage collection) can be restored by specifying --no-gc-sections on the
command line.

--gc-sections decides which input sections are used by examining symbols and
relocations. The section containing the entry symbol and all sections
containing symbols undefined on the command-line will be kept, as will sections
containing symbols referenced by dynamic objects. Note that when building shared
libraries, the linker must assume that any visible symbol is referenced. Once
this initial set of sections has been determined, the linker recursively marks
as used any section referenced by their relocations. See --entry and --undefined.