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

[meadori at codesourcery dot com]

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

--- Comment #9 from Meador Inge <meadori at codesourcery dot com> 2013-04-17 
20:56:03 UTC ---
(In reply to comment #8)
> This change detects the package which behaves differently
> when linked with gold. Now the linker issues an error instead
> of silently adds DT_NEEDED for weak reference. We can change
> error to warning.  But it won't fix the package's gold problem.

I must be missing something.

I am not quite sure what you mean by package.  The reproduction
case I provided is a standalone C/C++ program that linked before
the patch applied for this issue and doesn't after the patch is
applied.

The issue crops up because of a '__pthread_key_create' weak reference
that gets pulled in from 'gthr-default.h' (which is originally derived
from 'gthr-posix.h' in libgcc) as a part of the concurrency extension
implementation (which I guess gets dragged in with #include <string>).

With this patch applied the weak reference to '__pthread_key_create'
in test.o gets tracked and thus an error is issued.

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