[Bug math/19380] strtod does not raise "inexact"

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https://sourceware.org/bugzilla/show_bug.cgi?id=19380

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4725d33eed118d69b8110285f7741cde9ddc8b4f

commit 4725d33eed118d69b8110285f7741cde9ddc8b4f
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri Oct 28 00:40:23 2016 +0000

    Make strtod raise "inexact" exceptions (bug 19380).

    The strtod function should raise the "inexact" exception when its
    result is inexact, but fails to do so except in the case of underflow
    or overflow.  This patch fixes it to do so for all inexact results.

    tst-strtod-round is extended to test for this exception; the generator
    is fixed to properly mark inexact results as such in the case where
    the inexactness is from the mpfr_subnormalize step.

    Tested for x86_64, x86 and powerpc.

        [BZ #19380]
        * stdlib/strtod_l.c (round_and_return): Force "inexact" exception
        for inexact results.
        * stdlib/gen-tst-strtod-round.c (string_to_fp): Return indication
        of inexact result where mpfr_subnormalize is the only inexact
        step.
        * stdlib/tst-strtod-round-data.h: Regenerated.
        * stdlib/tst-strtod-round-skeleton.c [!FE_INEXACT] (FE_INEXACT):
        Define to 0.
        (GEN_ONE_TEST): Test inexact exceptions raised are as expected.

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

Summary of changes:
 ChangeLog                          |   13 +++++++++++++
 stdlib/gen-tst-strtod-round.c      |    4 ++--
 stdlib/strtod_l.c                  |   14 +++++++++++---
 stdlib/tst-strtod-round-data.h     |   26 +++++++++++++-------------
 stdlib/tst-strtod-round-skeleton.c |   18 ++++++++++++++++++
 5 files changed, 57 insertions(+), 18 deletions(-)

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