[cmake-developers] VS 2013 WindowsCE support

[Bach, Pascal]

> -----Original Message-----
> From: Brad King [mailto:brad.king at kitware.com]
> Sent: Mittwoch, 3. September 2014 15:35
> To: Bach, Pascal
> Cc: cmake-developers at cmake.org; Patrick Roland Gansterer
> Subject: Re: VS 2013 WindowsCE support
> 
> On 09/03/2014 05:23 AM, Bach, Pascal wrote:
> >>  elseif(CMAKE_VS_WINCE_VERSION)
> >>    set(CMAKE_SYSTEM_NAME      "WindowsCE")
> >>    set(CMAKE_SYSTEM_VERSION   "${CMAKE_VS_WINCE_VERSION}")
> >>    set(CMAKE_SYSTEM_PROCESSOR "${MSVC_C_ARCHITECTURE_ID}")
> >
> > Do we need to preserve the current behavior?
> 
> Yes, but only for the existing VS 11 WinCE-specific generator names.
> 
> > CMAKE_VS_WINCE_VERSION seems to be undocumented.
> 
> It is an internal implementation detail of the WinCE-specific
> VS generators.
> 
> > The new way would be to set CMAKE_SYSTEM_NAME and
> > CMAKE_SYSTEM_VERSION in a toolchain file.
> 
> Yes.
> 
> >> is basically a mini toolchain file.  A real toolchain file would
> >> explicitly specify the values.  We would also need a new variable
> >> to tell the generator which SDK to use.  Currently the info is
> >> in the internal CMAKE_VS_PLATFORM_NAME variable that corresponds
> >> to the platform component of the generator name.
> >
> > So do you agree that the right thing would be to add a
> > CMAKE_VS_PLATFORM_SDK (or CMAKE_GENERATOR_SDK ?) variable that
> > the user can set?
> 
> Let's use a name specific to WindowsCE like "CMAKE_VS_WINCE_SDK",
> at least for discussion and review purposes, so I can see where
> the variable fits in to the generator with your changes.  Then
> we can decide if there is a more general name to be used later.

I'm not sure this is really Windows CE specific. There is already an internal variable CMAKE_VS_PLATFORM_NAME that is set to Win32, Win64, ARM etc. This is also the variable that gets set to the SDK name. Currently this variable is set based on the Generator used, but there is also some other magic going on for example for Itanium.

Would it be desirable to be able to override this value independent of the generator used?

> > A resulting toolchain file would look something like this:
> >
> > set(CMAKE_SYSTEM_NAME "WindowsCE")
> > set(CMAKE_SYSTEM_VERSION "8.0")
> > set(CMAKE_SYSTEM_PROCESSOR "arm" )
> > set(CMAKE_GENERATOR_TOOLSET "CE800") # I still don't know if this is
> needed ;)
> > set(CMAKE_GENERATOR_SDK "MYSDK01")
> >
> > I don't understand the purpose of CMAKE_GENERATOR_TOOLSET resp.
> > CMAKE_VS_PLATFORM_TOOLSET.
> 
> The CMAKE_GENERATOR_TOOLSET is where a user-specified choice is
> set/saved.  The CMAKE_VS_PLATFORM_TOOLSET is the actual toolset
> that the generator will write in to the project file, and is
> provided only for reference (and internal compiler id detection).
> The latter may be set to a default selection that CMake VS gens
> pick even when no explicit CMAKE_GENERATOR_TOOLSET is set.

Based on your explanation and my findings above, the CMAKE_VS_PLATFORM_NAME variable should behave analogues to CMAKE_VS_PLATFORM_TOOLSET but I can't come up with a good name for a variable the user should set.

One way would be to just allow setting CMAKE_VS_PLATFORM_NAME and override the whole logic if it is set.

Any thoughts?

> 
> > As far as I understand they are independent of the SDK selected?
> 
> I'm not familiar enough with VS+WinCE tools to know how independent
> they are.

As far as I can tell they are, at least you can change both values in visual studio independently. If the result works is another question.

Pascal