[Bug math/6803] scalb(), scalbln(), scalbn() do not set errno on overflow/underflow

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https://sourceware.org/bugzilla/show_bug.cgi?id=6803

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8fed86556b7e162d2926f0ba6a573ed193ff882f

commit 8fed86556b7e162d2926f0ba6a573ed193ff882f
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Nov 5 17:00:31 2015 +0000

    Don't redirect ldexp to scalbn in bits/math-finite.h (bug 19209).

    bits/math-finite.h maps ldexp functions to corresponding scalbn
    functions.  This is (a) a namespace bug for C90, which has ldexp but
    not scalbn, and (b) in any case useless, since the ldexp and scalbn
    functions have identical semantics (for floating-point types with
    radix 2), and since the fix for bug 6803 are actually aliases
    (presumably the mapping was based around the old bug of scalbn not
    setting errno).  This patch removes the bogus redirections.

    Tested for x86_64 and x86.

        [BZ #19209]
        * math/bits/math-finite.h (ldexp): Remove declaration.
        (ldexpf): Likewise.
        (ldexpl): Likewise.

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

Summary of changes:
 ChangeLog               |    5 +++++
 NEWS                    |    2 +-
 math/bits/math-finite.h |    9 ---------
 3 files changed, 6 insertions(+), 10 deletions(-)

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