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

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

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=54fa2475d37b9c7afd903eb970362e50ec76f01e

commit 54fa2475d37b9c7afd903eb970362e50ec76f01e
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Mar 31 14:56:37 2014 +0000

    Set errno for atan2 underflow (bug 16349).

    This patch fixes bug 16349, missing errno setting for atan2 underflow,
    by adding appropriate checks to the existing wrappers.  (As in other
    cases, the __kernel_standard support for calling matherr is considered
    to be for existing code expecting existing rules for what's considered
    an error, even if those don't correspond to a general logical scheme
    for what counts as what kind of error, so __set_errno calls are added
    directly without any changes to __kernel_standard.)

    Tested x86_64 and x86.

        [BZ #16349]
        * math/w_atan2.c: Include <errno.h>.
        (__atan2): Set errno for result underflowing to zero.
        * math/w_atan2f.c: Include <errno.h>.
        (__atan2f): Set errno for result underflowing to zero.
        * math/w_atan2l.c: Include <errno.h>.
        (__atan2l): Set errno for result underflowing to zero.
        * math/auto-libm-test-in: Don't allow missing errno for some atan2
        tests.
        * math/auto-libm-test-out: Regenerated.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog               |   13 +
 NEWS                    |   10 +-
 math/auto-libm-test-in  |    9 +-
 math/auto-libm-test-out | 1076 +++++++++++++++++++++++-----------------------
 math/w_atan2.c          |    8 +-
 math/w_atan2f.c         |    8 +-
 math/w_atan2l.c         |    8 +-
 7 files changed, 581 insertions(+), 551 deletions(-)

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