Re: rebaseall and cygstdc++-6.dll

[Ryan Johnson <ryan dot johnson at cs dot utoronto dot ca>]

On 26/09/2011 2:28 AM, Marco Atzeri wrote:
> On 9/26/2011 5:15 AM, Yaakov (Cygwin/X) wrote:
> > On Mon, 2011-09-26 at 02:15 +0100, Dave Korn wrote:
> > >    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.
> >
> > Except that this issue doesn't affect only libstdc++, but any C++
> > library which throws exceptions (as I have seen on my system).  So we
> > really do need a patched binutils ASAP.
>
> There is an easy way to identify such libraries ?
> Just to know if I need to rebuild some of mines .
If the problem affects any library which throws (as opposed to one which 
merely supports propagating/unwinding due to exceptions), then the 
presence of __cxa_throw in the output of nm would be a good indicator. 
If unwind handlers are also affected, then anything with a .eh_frame 
section is suspect (but that would be all C++ programs unless compiled 
in no-except mode).

Ryan


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple