Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> Could any other configure tests fail in this way?
Good point. The isinf() test probably has the same failure mode.
There is also the sigsetjmp() test, but since that has side-effects,
it doesn't seem very much at risk of being aggressively optimized.
I don't see any other cases where we're avoiding AC_CHECK_FUNC.
regards, tom lane