[Interest] Update breaks version

[Duane]

On 19/12/2016 11:03 AM, Kai Koehne wrote:
>> -----Original Message-----
>> From: Interest [mailto:interest-bounces+kai.koehne=qt.io at qt-project.org]
>> On Behalf Of Duane
>> Sent: Monday, December 19, 2016 4:10 PM
>> To: interest at qt-project.org
>> Subject: [Interest] Update breaks version
>>
>> I have Qt installed on Windows using MinGW.  I was at 5.7.0 and updated via
>> the Maintenance tool to get to 5.7.1 and Creator 4.2.0.  My programs build
>> but when I deploy them to systems with 5.7.0 dlls they don't work.
>>   I thought the dlls were compatible through minor revisions?
>
> They should be, and the toolchain to the best of my knowledge hasn't changed
> in 5.7.1 packages.
>
> Could you clarify what 'don't work' means? I suggest to run the application
> in the Profile mode of 'Dependency Walker' (depends.exe) to find out details.
>

Don't work means that if I deploy the exe on a target machine with 
Qt4.7.0 dlls it won't run.  "It reports that the application has 
requested the runtime to terminate in an unusual way."  If I replace the 
dlls with those from 4.7.1 then it works.

I have two toolchains.  One with MinGW 3.0  and Qt 4.7.1 that I use with 
QtCreator.  This is the one that seems broken.  I think that MinGW was 
updated but it is still 3.0.

The other tool chain is with Qt 5.5 for the VS2012 compiler.  This one 
wasn't updated and doesn't seem to have this problem.