[Bug gold/16417] executable linked with gold segfaults before main

[ccoutant at google dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16417

--- Comment #9 from Cary Coutant <ccoutant at google dot com> ---
"Normally the linker will add a DT_NEEDED tag for each dynamic library
mentioned on the command line, regardless of whether the library is actually
needed or not.  --as-needed causes a DT_NEEDED tag to only be emitted for a
library that at that point in the link

[a] satisfies a non-weak undefined symbol reference from a regular object file
or,

[b] if the library is not found in the DT_NEEDED lists of other libraries, a
non-weak undefined symbol reference from another dynamic library."

Case [a] is not satisfied here, since there is no reference to libpthread from
a regular object file.

Case [b] is related to one of the major differences between BFD ld and gold:
gold does not track DT_NEEDED lists from shared libraries, so it does not check
for this case.

I'm still a bit puzzled as to why there's a weak reference to libpthread in the
first place. And if there's a weak references, why isn't the code prepared to
deal with it remaining unresolved? This seems like an artificial test case to
me.

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