Bug#841638: transition: libcrypto++

[Julien Cristau <jcristau@debian.org>]

On Sat, Oct 22, 2016 at 14:43:08 +0200, László Böszörményi wrote:

> Hi Emilio,
> 
> On Sat, Oct 22, 2016 at 1:06 PM, Emilio Pozuelo Monfort
> <pochu@debian.org> wrote:
> > On 21/10/16 18:20, Laszlo Boszormenyi (GCS) wrote:
> >> I'd like to update libcrypto++ from 5.6.4 to 5.6.5; which is a
> >> semi-transition. Packages I've tried works with both version,
> >> however without binNMUs those will print this:
> >> Symbol `_ZTVN8CryptoPP23FilterWithBufferedInputE' has different size in shared object, consider re-linking
> >> Symbol `_ZTVN8CryptoPP10HexEncoderE' has different size in shared object, consider re-linking
> >> Symbol `_ZTVN8CryptoPP11ProxyFilterE' has different size in shared object, consider re-linking
> >>
> >> This matches upstream recommendation[1]:
> >> "maintenance release, recompile of programs recommended"
> >
> > Does this bump the SONAME, or is it an ABI break without a SONAME bump?
>  No, the SONAME is the same. ABI should be the same, but I've found
> one (more may exist) case where one (probably internal) symbol can't
> be found anymore:
> Generating secure encryption key. This might take some time..done
> cryfs: symbol lookup error: cryfs: undefined symbol:
> _ZN8CryptoPP10RandomPool34GenerateIntoBufferedTransformationERNS_22BufferedTransformationERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEy
> 
If it causes programs built against the older version to no longer work,
then it's not internal, it is an ABI break and needs SONAME bump and
package name change.

Cheers,
Julien