[cmake-developers] Determining version and arch for Visual Studio generators.

[Stephen Kelly]

Stephen Kelly wrote:

> Bill Hoffman wrote:
> 
>> Seems a bit unstable to hard code the version.  I wonder if you can
>> detect the one that is being used somehow?
> 
> I don't think it's unstable, but I do think the version and arch should be
> detected somehow.
> 
> Would it be possible for cmake to run devenv to check the version and arch
> before setting the default generator? That would have anticipated and pre-
> solved the bug here.

I suppose the arch problem occurred because Qt was built in 64bit mode, and 
that has nothing to do with devenv.

I can put a variable in the Qt5Core config file containing the arch. Better 
yet, I can put it in a INTERFACE_TARGET_ARCH target property and have cmake 
ensure that all targets are compatible. 

Such a TARGET_ARCH should be a built-in property in CMake, and CMake should 
also check it for each target against the generator. That would at least 
give a sensible error message about what the problem is at cmake-time.

This might also be generally useful for storing an arch triple on linux 
systems? Can 32 and 64 bit libs be mixed there?

This isn't for 2.8.11 obviously. 

Thanks,

Steve.