The article states: >"Here, while there are a number of members which have the same types, the layout of these such as the order of the members is rather diffe

The article states: >"Here, while there are a number of members which have the same types, the layout of these such as the order of the members is rather different. There’s nothing wrong with that; however, it’s pieces like this that are part of each system’s ABI." The author linked to the System V ABI and the processor-specific ABI docs and in the "Further Reading" section has links to the stdio header files. Are the system ABIs that are not covered by the System V ABI and the processor-specific ABIs always defined in header files then? There's no singular or centralized spec?