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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
It cannot be solved in a portable way, yes. Solutions have to assume ABI, which for CW is SystemV for linux.
Majotiry of solutions takes approach with inline assembly, but there are some smart solutions which avoid it. But still you need some address-of magic/abuse to get the stack parameters, yes.
Bottom line is: it cannot be solved in a portable way, but it can be solved without inline assembly.