After using the Green Hills MULTI generator for a while I find setting up the build a bit clumsy and inconsistent.
In the build files themselves there is a field called primaryTarget which tells the build system what compilers and settings will be used for cross-compiling.
Some examples:
arm_integrity.tgt is for using the Integrity OS for 32 bit ARM.
arm_integrity64.tgt is for using the Integrity OS for 64 bit ARM.
ppc_integrity.tgt is for PowerPC Integrity OS
86_linux.tgt is for x86 Linux targets
Today the primaryTarget gets set from a user defined cache variable GHS_PRIMARY_TARGET.
If the user didn’t set it then its pieced together from <CMAKE_GENERATOR_PLATFORM>_<GHS_TARGET_PLATFORM>.tgt. These variables if not user specified defaulted such that the primaryTarget would be 'arm_integrity.tgt`.
The part I find clumsy is that the only use that -A has is setting CMAKE_GENERATOR_PLATFORM but that has no meaning if GHS_PRIMARY_TARGET was set.
Because of the way the generator morphed over time from always assuming ARM you can find yourself in a situation of CMAKE_GENERATOR_PLATFORM equaling arm but primaryTarget equaling ppc_integrity.tgt. So the actual target architecture is PowerPC.
For simplicity’s sake I’d like to just run cmake -A ppc_integrity.tgt and not worry about the way its being done today and just get rid of some of these GHS specific variables. But that leads to a backwards compatibility issue with previous CMake versions.