gnulib m4/threadlib.m4 bug crashing package tests

[Achim Gratz]

Brian Inglis writes:
> The problem with Cygwin weak symbols is apparently that ld expects
> there to be a runtime dynamic loader to resolve NULL weak dynamic
> library references, but unlike ELF neither Cygwin nor Windows does so,
> and PE may not retain the information to do so, or this project would
> likely have done so.

No, that part is well understood since more than a decade when that
problem first hit, the actual problem is that such symbols no
longer resolve to 0x0 on 64bit.


Regards,
Achim.
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