[Development] QtMultimedia BIC / header cleanliness issue

Thiago Macieira thiago.macieira at intel.com
Fri Dec 28 13:03:55 CET 2012

On sexta-feira, 28 de dezembro de 2012 19.11.32, Sze Howe Koh wrote:
> On 25 December 2012 01:35, Thiago Macieira <thiago.macieira at intel.com> 
> > On segunda-feira, 24 de dezembro de 2012 06.30.58, Sascha Cunz wrote:
> >> But strictly spoken, I would rather say no: BC is BC no matter what silly
> >> mistakes it includes (I have actually had to deal with code that used the
> >> above mentioned inheritance layouts).
> >> OTOH, it's still very early in the life of released Qt5.
> > 
> > We can change the soname for the library. libQt5Multimedia.so.6.
> I've never seen Qt DLLs that have additional numbers on Windows; is
> the changing-soname approach acceptable on Windows and Mac?

It's acceptable on Mac, for the .dylib (non-framework) builds. For framework 
builds as well as for Windows, we'd have to invent some new method.

On Windows, the Qt DLLs have always had the version number: QtCore4.dll and 
Qt5Core.dll. However, we're now proposing separating the source version (5) 
from the binary version (6).

> Whatever solution is taken, we'll need to add notes to the
> documentation of both classes, either to say "Binary files that
> include this interface are incompatible between Qt 5.0 and Qt 5.1", or
> "This interface class contains a bug, do not perform a deletion
> through it."


Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
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