> > 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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