Does anyone know what the situation is in C89, or whatever the applicable
standard is?

[ *looks* ]

The text is the same in both versions:


"The order of evaluation of the function designator, the arguments, and
subexpressions within the arguments is unspecified, but there is a
sequence point before the actual call."

(On reading this more closely, I suppose you could make the argument that a function call that takes place in the argument list of another function call is a "subexpression within the [outer function's] arguments", so the order of evaluation prior to the call of the outer function would be undefined. But I don't think that's the right reading of the standard.)


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