Possible Defect Report: Externally visible exceptional conditions.
C99 7.12.1 Treatment of error conditions paragraph 1 has: Each function shall execute as if it were a single operation without generating any externally visible exceptional conditions.
As written, I believe that means that errno cannot be altered by any math function, nor can any of the floating-point exceptions mentioned later in 7.12.1 ("invalid", "divide-by-zero", "overflow", "underflow") be raised by any math function.
That was not our intent.
Seems to me that there are two problems with that text in 7.12.1:
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