[CMake] Set CMAKE_TOOLCHAIN_FILE from cmake-gui

[Roland Waltersson]

Hi,
I am trying to get a user to choose target from cmake-gui, with:

SET(TARGET "x86" CACHE STRING "Target (x86 or arm)")
#some code here to construct CMAKE_TOOLCHAIN_FILE from TARGET variable

This however don't work as the compiler settings are initialized when
cmake-gui starts, not when the user presses Generate. So changing TARGET
won't have any effect, except by chaning its default value.

I have solved this now by instead using an .sh file to invoke cmake, but I
would really like to be able to change this via cmake-gui. Is it even
possible? thanks in advance!
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