[Bug build/24022] riscv build failure with Linux kernel 4.20-rc7

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https://sourceware.org/bugzilla/show_bug.cgi?id=24022

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0b9c84906f653978fb8768c7ebd0ee14a47e662e

commit 0b9c84906f653978fb8768c7ebd0ee14a47e662e
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Dec 31 09:26:42 2018 -0800

    riscv: Use __has_include__ to include <asm/syscalls.h> [BZ #24022]

    <asm/syscalls.h> has been removed by

    commit 27f8899d6002e11a6e2d995e29b8deab5aa9cc25
    Author: David Abdurachmanov <david.abdurachmanov@gmail.com>
    Date:   Thu Nov 8 20:02:39 2018 +0100

        riscv: add asm/unistd.h UAPI header

        Marcin Juszkiewicz reported issues while generating syscall table for
riscv
        using 4.20-rc1. The patch refactors our unistd.h files to match some
other
        architectures.

        - Add asm/unistd.h UAPI header, which has __ARCH_WANT_NEW_STAT only for
64-bit
        - Remove asm/syscalls.h UAPI header and merge to asm/unistd.h
        - Adjust kernel asm/unistd.h

        So now asm/unistd.h UAPI header should show all syscalls for riscv.

    <asm/syscalls.h> may be restored by

    Subject: [PATCH] riscv: restore asm/syscalls.h UAPI header
    Date: Tue, 11 Dec 2018 09:09:35 +0100

    UAPI header asm/syscalls.h was merged into UAPI asm/unistd.h header,
    which did resolve issue with missing syscalls macros resulting in
    glibc (2.28) build failure. It also broke glibc in a different way:
    asm/syscalls.h is being used by glibc. I noticed this while doing
    Fedora 30/Rawhide mass rebuild.

    The patch returns asm/syscalls.h header and incl. it into asm/unistd.h.
    I plan to send a patch to glibc to use asm/unistd.h instead of
    asm/syscalls.h

    In the meantime, we use __has_include__, which was added to GCC 5, to
    check if <asm/syscalls.h> exists before including it.  Tested with
    build-many-glibcs.py for riscv against kernel 4.19.12 and 4.20-rc7.

        [BZ #24022]
        * sysdeps/unix/sysv/linux/riscv/flush-icache.c: Check if
        <asm/syscalls.h> exists with __has_include__ before including it.

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

Summary of changes:
 ChangeLog                                    |    6 ++++++
 sysdeps/unix/sysv/linux/riscv/flush-icache.c |    6 +++++-
 2 files changed, 11 insertions(+), 1 deletions(-)

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