[Bug math/16349] New: atan2 does not set errno on underflow

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16349

            Bug ID: 16349
           Summary: atan2 does not set errno on underflow
           Product: glibc
           Version: 2.19
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org

At least some atan2 versions do not set errno to ERANGE on underflow (atan2
(small, positive large) where y/x underflows to 0) although this meets the
definition of a case where glibc aims to set errno on underflow.  For example,
testing for float on x86_64:

Failure: atan2 (-0x4p-128, 0xf.fffffp+124): errno set to 0, expected 34
(ERANGE)

(I've sent a proposed DR to John Benito for the lack of mention of a range
error for this case in C11.)

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