[cmake-developers] Do all non-Windows host platforms support uname(3)

[Brad King]

On 12/27/2016 11:14 AM, Gregor Jasny via cmake-developers wrote:
> recently I realized that most pre-defined CMake variables are not
> available in scripting context. In my use case I had to identify a Linux
> host system. Unfortunately only CMAKE_HOST_{APPLE,SOLARIS,UNIX,WIN32}
> are available in scripting context.
> 
> I wondered if all supported host operating systems support the uname(3)
> function call? If yes we could also make CMAKE_HOST_SYSTEM_NAME in
> scripting context.
> 
> A proof-of-concept patch is located here:
> https://gitlab.kitware.com/gjasny/cmake/commits/cmake-host-system-name

That looks worth a try.  If any platforms come up where it is not
supported then we can port the source accordingly.

I'd like to wait a while before testing it in `next` because there
are many open MRs I need to get through in the next few days.

Thanks,
-Brad