[Bug ld/15149] Weak reference leads to DT_NEEDED entry

[hjl.tools at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15149

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> 2013-03-11 19:45:05 
UTC ---
(In reply to comment #4)
> This change is bogus, and breaks lots of packages.
> There is nothing wrong with undef weak references that might sometimes be
> satisfied by some library, but in the next version of the library no longer
> brought in.  DT_NEEDED for undef weak references shouldn't be added, and
> nothing should be diagnosed.  Please revert.

The old linker silently adds the DSO to DT_NEEDED for weak reference.
Even if the next version of the library no longer brings in the DSO,
it is still in DT_NEEDED of executables linked against the current
library.

Gold doesn't add the DSO to DT_NEEDED for weak reference.  But it
leads to different run-time behavior.  See:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56431

for example.

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