[Bug ld/26551] A definition referenced by an unneeded (--as-needed) shared object should be exported

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=26551

--- Comment #5 from Fangrui Song <i at maskray dot me> ---
ld.bfd a.o --as-needed b.so

Let a.o define a function which will be called by b.so via dlopen. In this
case, ld should export the function. This justification may look weak but I
think it is moving toward the right direction if we consider that GNU ld from
binutils 2.22 defaulted to --no-copy-dt-needed-entries (doing less shared
object traversal for more proper dependency tracking and avoiding unneeded
work).

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