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

[hjl.tools at gmail dot com]

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

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |hjl.tools at gmail dot com

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Fangrui Song from comment #1)
> 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

When foo is undefined,

1. If foo isn't referenced, --export-dynamic-symbol foo should be NOP since
there is nothing to export.
2. If foo is referenced, --export-dynamic-symbol foo should be NOP since foo
should be dynamic.

> 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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