Bug#911090: libapt-pkg5.0: incompatible with apt/stretch

[Julian Andres Klode <jak@debian.org>]

On Mon, Oct 15, 2018 at 05:12:10PM +0200, Andreas Beckmann wrote:
> Package: libapt-pkg5.0
> Version: 1.7.0
> Severity: serious
> 
> Hi,
> 
> I just did a partial upgrade on a stretch+buster+sid development
> system resulting in apt-get erroring out with 
> 
> apt-get: relocation error: /usr/lib/x86_64-linux-gnu/libapt-private.so.0.0: symbol _ZN3URIcvNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEB5cxx11Ev version APTPKG_5.0 not defined in file libapt-pkg.so.5.0 with link time reference
> 
> Looks like some Breaks may be needed ...

So, I think this affects more than just apt. gcc 7 broke the ABI
by adding a new mangling

  URI::operator std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >()

and only linking to that. It seems that some new gcc version then
got rid of the old one

  URI::operator std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >[abi:cxx11]()

and now it's crashing.

And that's a problem for _every_ library with operator string(), not
just apt.

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