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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: bignum branch
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> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Sat, 11 Aug 2018 18:56:15 +0100
> 
> > What do the following GDB commands show, in the crashing build?
> >
> >   (gdb) disassemble __gmpz_popcount
> >   (gdb) ptype __gmpz_popcount
> >   (gdb) ptype __gmpn_popcount
> 
> Nothing useful :-(

What about

  (gdb) disassemble Flogcount

?