[CMake] Computation of CMAKE_OSX_SYSROOT

[Robert Maynard]

Documentation changes can be done through the CMake project hosted on
gitlab. You would want to modify the file:
https://gitlab.kitware.com/cmake/cmake/blob/master/Help/variable/CMAKE_OSX_DEPLOYMENT_TARGET.rst



On Mon, Oct 1, 2018 at 11:13 AM James Turner via CMake <cmake at cmake.org>
wrote:

>
>
> On 1 Oct 2018, at 14:25, Craig Scott <craig.scott at crascit.com> wrote:
>
> You need to set CMAKE_OSX_DEPLOYMENT_TARGET as a *cache* variable before
> calling the project() command. If you set it as a normal (i.e. non-cache)
> variable, the compiler detection logic triggered by the project() call
> creates a cache variable if one doesn't exist, which would discard the
> non-cache variable. It's a bit unfortunate, but that's what happens when
> you set a cache variable for the first time. The relevant code related to
> your observations is in Modules/Platform/Darwin-Initialize.cmake.
>
>
> Thanks, that was indeed the solution.
>
> I’d suggest the docs page for CMAKE_OSX_DEPLOYMENT_TARGET could use some
> wording to point this out, but I don’t know who . how a docs change gets
> done.
>
> James
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