[CMake] Correct way to use ARMCC (Files in Modules/Compiler/ARMCC*)

[Chuck Atkins]

>
> 1. Toolchain needs to be in a separate file
>

Yes, that is certainly best practice and makes the rest of the
cross-compiling infrastructure just work better.



> 2.  That file needs to be called before the project line of your
> CMakeLists.txt
>

You actually shouldn't be "calling" it at all.  You specify it with cmake
-DCMAKE_TOOLCHAIN_FILE=/path/to/MyARMStuff.cmake ...[other cmake options]
/path/to/source.  CMake then explicitly processes the toolchain file in a
few different places but handles when to do this internally.  Basically you
write your CMakeLists.txt without worrying much about cross-compiling and
you specify the toolcain file to let CMake deal with the cross-compile
aspect.
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