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Date:	Mon, 26 Sep 2011 02:15:32 +0100
From:	Dave Korn <dave DOT korn DOT cygwin AT gmail DOT com>
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Subject:	Re: rebaseall and cygstdc++-6.dll
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On 25/09/2011 21:31, Chris Sutcliffe wrote:
> On 25 September 2011 02:07, Dave Korn wrote:
>>  I finally nailed this one down.  Stray base relocs against references to
>> symbols in discarded COMDAT sections remaining in the .eh_frame data cause the
>> stack unwind lookup to get lost.  Sourceware CVS is down right now but I'll be
>> sending the attached to binutils when it's working again, and I've started
>> building a 4.5.3-3 release.
> 
> I'm confused, is the issue in binutils or gcc?  If the issue is in
> binutils, is rebuilding gcc going to help?  Either way, glad you
> nailed it!

  The problem is in binutils, and the fact that it generates base relocs for
entries from EH data that should be just ignored.

  http://sourceware.org/ml/binutils/2011-09/msg00174.html
contains more detail, if you want to ask more let's do it on the binutils list.

  So to answer your question: the gcc language-specific runtime DLLs have to
be built using the patched version of binutils, otherwise they break when they
get rebased; that's why I'm rebuilding the gcc packages - having already
locally rebuilt binutils.  This will only be a big issue for anyone who wants
to rebuild gcc from source themselves, the new packages I upload to the distro
will still work for everyone regardless of what binutils they have installed
and/or how or when or where they get rebased.

    cheers,
      DaveK


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