Fangrui Song
70496276d0
Commit c0fc253071 (2017) implements
--retain-symbols-file with symbol version machinery
`{local: *; global: listed;}`, which removes unlisted symbols from
.dynsym and leaves .symtab untouched. GNU ld does the opposite: it keeps
only the listed symbols in .symtab and does not touch .dynsym.
Reuse the --discard-{locals,all} mechanism to reimplement the feature,
matching GNU ld.
Use --export-dynamic-symbol or a version script to control .dynsym.
Extend `markUsedSymbols` to mark referenced globals as well, so
--emit-relocs/-r keep a valid symbol index.
Fix #91055
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