[Bug libc/25635] arm: Wrong sysdep order selection for soft-fp

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25635

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Adhemerval Zanella
<azanella@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=af09e5e5d9ec3ca20891e61a6922eac984fcbdc4

commit af09e5e5d9ec3ca20891e61a6922eac984fcbdc4
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Mar 5 13:14:41 2020 +0000

    arm: Fix softp-fp Implies (BZ #25635)

    The commit "arm: Split BE/LE abilist"
    (1673ba87fefe019c834c09d33673d1d453ea698d) changed the soft-fp order for
    ARM selection when __SOFTFP__ is defined by the compiler.

    On 2.30 the sysdeps order is:

    2.30
    sysdeps/unix/sysv/linux/arm
    sysdeps/arm/nptl
    sysdeps/unix/sysv/linux
    sysdeps/nptl
    sysdeps/pthread
    sysdeps/gnu
    sysdeps/unix/inet
    sysdeps/unix/sysv
    sysdeps/unix/arm
    sysdeps/unix
    sysdeps/posix
    sysdeps/arm/nofpu
    sysdeps/ieee754/soft-fp
    sysdeps/arm
    sysdeps/wordsize-32
    sysdeps/ieee754/flt-32
    sysdeps/ieee754/dbl-64
    sysdeps/ieee754
    sysdeps/generic

    While on master is:

    sysdeps/unix/sysv/linux/arm/le
    sysdeps/unix/sysv/linux/arm
    sysdeps/arm/nptl
    sysdeps/unix/sysv/linux
    sysdeps/nptl
    sysdeps/pthread
    sysdeps/gnu
    sysdeps/unix/inet
    sysdeps/unix/sysv
    sysdeps/unix/arm
    sysdeps/unix
    sysdeps/posix
    sysdeps/arm/le
    sysdeps/arm
    sysdeps/wordsize-32
    sysdeps/ieee754/flt-32
    sysdeps/ieee754/dbl-64
    sysdeps/arm/nofpu
    sysdeps/ieee754/soft-fp
    sysdeps/ieee754
    sysdeps/generic

    It make the build select some routines (fadd, fdiv, fmul, fsub, and fma)
    on ieee754/flt-32 and ieee754/dbl-64 that requires fenv support to be
    correctly rounded which in turns lead to math failures since the
    __SOFTFP__ does not have fenv support.

    With this patch the order is now:

    sysdeps/unix/sysv/linux/arm/le
    sysdeps/unix/sysv/linux/arm
    sysdeps/arm/nptl
    sysdeps/unix/sysv/linux
    sysdeps/nptlsysdeps/pthread
    sysdeps/gnu
    sysdeps/unix/inet
    sysdeps/unix/sysv
    sysdeps/unix/arm
    sysdeps/unix
    sysdeps/posix
    sysdeps/arm/le/nofpu
    sysdeps/arm/nofpu
    sysdeps/ieee754/soft-fp
    sysdeps/arm/le
    sysdeps/arm
    sysdeps/wordsize-32
    sysdeps/ieee754/flt-32
    sysdeps/ieee754/dbl-64
    sysdeps/ieee754
    sysdeps/generic

    Checked on arm-linux-gnuaebi.

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