That is pretty much what I remember hearing at the time.

A well-known way to trigger undefined behaviour is "x++=x++;" because
there is no sequence point between the two side effects.  Try it: gcc will
give you a stern warning.  Given that there is no sequence point between
argument expressions, as per the paragraph you quote, the same must go for
"c(x++,x++)".  So then it becomes dubious that there is suddenly a
guarantee for "c(a(),b())"!

Right; my interpretation is that the "sequence point before function call" rule applies recursively. So in c(a(...), b(...)), there are in fact three sequence points, which precede the calls of a, b, and c. Shouldn't that be sufficient to ensure that the evaluation of libpq_gettext() is not interleaved with the evaluation of the other arguments to the printf()?


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