[Qt5-feedback] Real 64 Bit support ?

[Stephen Bryant]

Hi Ben,

On 17/05/2011 13:05, BRM wrote:
> This is solvable even without using C++ Exceptions. However, it would break 
> binary compatibility so is not an option for Qt5.
> The binary compatibility requirement is perhaps the only reason not to go to 
> unsigned int for Qt5.
[...]
> I believe the requirement  was that source incompatibility was acceptable while 
> _binary_ incompatibility was not; no qualifications given per source 
> compatibility.
> Or was I mistaken on Nokia's intent there? (Thiago?)


Not Thiago, but Lars Knoll wrote this:

> To be explicit here – we believe we can keep source compatibility for the majority of cases, but we believe that breaking binary compatibility is needed.

Source: http://labs.qt.nokia.com/2011/05/09/thoughts-about-qt-5/


So, it seems there is no requirement for Qt5 to maintain binary
compatibility with Qt4.  This is what I expected, and it's in keeping
with previous releases.

Steve