[Bug math/22402] [powerpc64le] __MATH_TG does not support _Float128 for -mlong-double-64

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https://sourceware.org/bugzilla/show_bug.cgi?id=22402

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4e2dff67beeb063cb36fe100d9d2b3f2f88d80c6

commit 4e2dff67beeb063cb36fe100d9d2b3f2f88d80c6
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Nov 6 13:26:15 2017 +0000

    Do not declare _Float128 support for powerpc64le -mlong-double-64 (bug
22402).

    The powerpc bits/floatn.h declares _Float128 support to be present
    when the compiler supports it for powerpc64le.  However, in the case
    where -mlong-double-64 is used, __MATH_TG does not actually support
    _Float128; it only supports _Float128 in the distinct-long-double
    case.

    This shows up as a build failure when building glibc mainline with GCC
    mainline, given the recently added sanity check in math.h for
    configurations supported by __MATH_TG, as the compat code for
    -mlong-double-64 fails to build.  However, the bug was logically
    present before that change (including in 2.26), just less visible.

    This patch fixes the build failure by declaring _Float128 to be
    unsupported in that case.  (Of course this can't actually stop users
    calling the type-generic macros with _Float128 arguments with
    -mlong-double-64, just as they could be called with other unsupported
    types on other platforms, but perhaps makes it less likely by making
    all the type-specific _Float128 interfaces invisible in that case.)

    Tested compilation for powerpc64le with build-many-glibcs.py.

        [BZ #22402]
        * sysdeps/powerpc/bits/floatn.h: Include <bits/long-double.h>.
        [__NO_LONG_DOUBLE_MATH] (__HAVE_FLOAT128): Define to 0.

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

Summary of changes:
 ChangeLog                     |    6 ++++++
 sysdeps/powerpc/bits/floatn.h |    3 ++-
 2 files changed, 8 insertions(+), 1 deletions(-)

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