MATHERRNO

Message        <Context> function <name> is defined to set errno
               when a domain error or range error occurs.  As an
               intrinsic, it may not be able to do so.

Description    Any code that tests the value of errno set by this
               function may not work properly due to the
               optimizations that are possible when this function is
               an intrinsic.

User Action    If the value of errno set by this function is
               ignored, tell the compiler via its command line
               qualifiers to assume nomath_errno.  Otherwise,
               disable the intrinsic by using a #pragma
               function(func-name).