[Bug binutils/20979] DLL relocation totally broken

[lindasc at qq dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20979

--- Comment #4 from Linda Zhang <lindasc at qq dot com> ---
(In reply to Linda Zhang from comment #2)
> (In reply to Nick Clifton from comment #1)
> > Hi Linda,
> > 
> > > Binutils: 2.25.1
> > 
> > Have you tried using a more recent version of the binutils ?  We are
> > currently on release 2.27 and release 2.28 is about to happen.
> > 
> > Cheers
> >   Nick
> 
> Hi Nick,
> 
> Thank you for your reply, but I don't know how to build binutils for mingw
> so I can only wait for their builds. :(
> I even don't know whom to ask so I'm asking mingw now because it's their
> bundle.
> 
> I found at least in lib/gcc/i686-w64-mingw32/6.2.0/crtbegin.o, some NULL
> pointers were accidently relocated thus lead to SEGFAULT. There may be more
> errors. Buggy builds from at least 4.8.x to 6.2.

Hi Nick,

I think I found the reason.

Binutils (it should be) produced duplicate .reloc info into the binary. The
wrong one comes first, and the correct one comes after, resulting in double
relocation.

The new attached picture "bug.png" says all.

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