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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.