[Bug ld/25910] Support --export-dynamic-symbol $symbol

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=25910

--- Comment #1 from Fangrui Song <i at maskray dot me> ---
https://sourceware.org/pipermail/binutils/2020-May/110930.html [PATCH] ld: Add
--export-dynamic-symbol

Note, in gold and lld, --export-dynamic-symbol foo does not add foo to .symtab
if foo does not exist. I prefer the semantics, but (I don't know hot to
implement the semantics) my patch behaves like regular -u: there is an
undefined symbol in .symtab . This difference does not really in practice,
though.

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