[Bug math/21134] Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1 (-0.0) when linking with -lieee

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https://sourceware.org/bugzilla/show_bug.cgi?id=21134

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4918e5f4cd63290bb0b2c614f52092ca6a779126

commit 4918e5f4cd63290bb0b2c614f52092ca6a779126
Author: Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
Date:   Sun Feb 12 22:36:27 2017 -0200

    Fix y0 and y1 exception handling for zero input [BZ #21134]

    The Bessel functions of the second type (Yn) should raise the "divide
    by zero" exception when input is zero (both positive and negative).
    Current code gives the right output, but fails to set the exception.
    This error is exposed for float, double, and long double when linking
    with -lieee.  Without this flag, the error is not exposed, because the
    wrappers for these functions, which use __kernel_standard
    functionality, set the exception as expected.

    Tested for powerpc64le.

        [BZ #21134]
        * sysdeps/ieee754/dbl-64/e_j0.c (__ieee754_y0): Raise the
        "divide by zero" exception when the input is zero.
        * sysdeps/ieee754/dbl-64/e_j1.c (__ieee754_y1): Likewise.
        * sysdeps/ieee754/flt-32/e_j0f.c (__ieee754_y0f): Likewise.
        * sysdeps/ieee754/flt-32/e_j1f.c (__ieee754_y1f): Likewise.
        * sysdeps/ieee754/ldbl-128/e_j0l.c (__ieee754_y0l): Likewise.
        * sysdeps/ieee754/ldbl-128/e_j1l.c (__ieee754_y1l): Likewise.

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

Summary of changes:
 ChangeLog                        |   11 +++++++++++
 sysdeps/ieee754/dbl-64/e_j0.c    |    2 +-
 sysdeps/ieee754/dbl-64/e_j1.c    |    2 +-
 sysdeps/ieee754/flt-32/e_j0f.c   |    2 +-
 sysdeps/ieee754/flt-32/e_j1f.c   |    2 +-
 sysdeps/ieee754/ldbl-128/e_j0l.c |    2 +-
 sysdeps/ieee754/ldbl-128/e_j1l.c |    2 +-
 7 files changed, 17 insertions(+), 6 deletions(-)

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