[cmake-developers] Idea for Multi-Toolchain Support

[frodak17]

What first cross my mind with '"utilities" needed for build' is when you
have to build the cross-compiler in the first place before you build
anything for the target.
If so how do you handle verification of the tool-chain can build a working
executable or library?
Normally that is done at the time before project files are generated but it
has to either be skipped or delayed because the toolchain doesn't even
exist because it has to be built first by the host tools. For tool-chains
that already exist on the host machine then add_toolchain() command is when
you can test and verify its functionality?

So if you want to build both for host and cross toolchain you'll have to
>> explicitely
>> add_executable/library(MyLibrary TOOLCHAIN DEFAULT)
>> add_executable/library(MyLibrary TOOLCHAIN CrossToolchain)
>>
>
Do these targets automatically get separate binary directories so that the
outputs don't overwrite each other?

I assume this feature is limited only to ninja or makefile generators?
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