[Bug dynamic-link/21041] Fix for bug 20019 causes linker errors for shared libraries using longjmp

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21041

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-01-13
     Ever confirmed|0                           |1

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Phil Blundell from comment #8)
> (In reply to H.J. Lu from comment #6)
> > I take this back.  Does this testcase ever work after
> > 
> > commit ec2a88b3c659ad4f5a662ca289edae4f0dc19d88
> > Author: Roland McGrath <roland@hack.frob.com>
> > Date:   Fri Feb 6 10:53:27 2015 -0800
> > 
> >     Clean up NPTL longjmp to be compat-only.
> > 
> 
> I just did a superficial test with glibc 2.24 and I think you may be right
> that it is broken there too.  In a real application the failure is less
> obvious prior to your patch because it only crashes when longjmp() is
> actually called (which may happen rarely or never) whereas with your patch
> installed the binary won't even start.  But it looks as though it may not
> have worked correctly for some time.

My fix for PR 20019 prevents broken applications from start. It is unsafe
for IFUNC resolver to reference external symbols as shown here.

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