That is pointless hairsplitting, in practice in every mainstream platform where programs can use shared libraries there is a C ABI. That it is not defined by th

That is pointless hairsplitting, in practice in every mainstream platform where programs can use shared libraries there is a C ABI. That it is not defined by the C standard doesn't mean it doesn't exist, it only means that the C standard cannot be relied on for the ABI - and that is all that it means wrt. to the C standard. But very few programs limit themselves only to what is defined by the C standard.