[Bug dynamic-link/22093] ld.so no longer searches in .../x86_64

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https://sourceware.org/bugzilla/show_bug.cgi?id=22093

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=45ff34638f034877b6a490c217d6a0632ce263f4

commit 45ff34638f034877b6a490c217d6a0632ce263f4
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Sep 11 08:18:11 2017 -0700

    x86: Add x86_64 to x86-64 HWCAP [BZ #22093]

    Before glibc 2.26, ld.so set dl_platform to "x86_64" and searched the
    "x86_64" subdirectory when loading a shared library.  ld.so in glibc
    2.26 was changed to set dl_platform to "haswell" or "xeon_phi", based
    on supported ISAs.  This led to shared library loading failure for
    shared libraries placed under the "x86_64" subdirectory.

    This patch adds "x86_64" to x86-64 dl_hwcap so that ld.so will always
    search the "x86_64" subdirectory when loading a shared library.

    NB: We can't set x86-64 dl_platform to "x86-64" since ld.so will skip
    the "haswell" and "xeon_phi" subdirectories on "haswell" and "xeon_phi"
    machines.

    Tested on i686 and x86-64.

        [BZ #22093]
        * sysdeps/x86/cpu-features.c (init_cpu_features): Initialize
        GLRO(dl_hwcap) to HWCAP_X86_64 for x86-64.
        * sysdeps/x86/dl-hwcap.h (HWCAP_COUNT): Updated.
        (HWCAP_IMPORTANT): Likewise.
        (HWCAP_X86_64): New enum.
        (HWCAP_X86_AVX512_1): Updated.
        * sysdeps/x86/dl-procinfo.c (_dl_x86_hwcap_flags): Add "x86_64".
        * sysdeps/x86_64/Makefile (tests): Add tst-x86_64-1.
        (modules-names): Add x86_64/tst-x86_64mod-1.
        (LDFLAGS-tst-x86_64mod-1.so): New.
        ($(objpfx)tst-x86_64-1): Likewise.
        ($(objpfx)x86_64/tst-x86_64mod-1.os): Likewise.
        (tst-x86_64-1-clean): Likewise.
        * sysdeps/x86_64/tst-x86_64-1.c: New file.
        * sysdeps/x86_64/tst-x86_64mod-1.c: Likewise.

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

Summary of changes:
 ChangeLog                                          |   19 +++++++++++++++++++
 sysdeps/x86/cpu-features.c                         |    3 ++-
 sysdeps/x86/dl-hwcap.h                             |   12 +++++++-----
 sysdeps/x86/dl-procinfo.c                          |    4 ++--
 sysdeps/x86_64/Makefile                            |   17 +++++++++++++++++
 sysdeps/x86_64/{tst-quad1.c => tst-x86_64-1.c}     |    3 ++-
 .../strcmp-sse4_2.S => tst-x86_64mod-1.c}          |    9 +++++----
 7 files changed, 54 insertions(+), 13 deletions(-)
 copy sysdeps/x86_64/{tst-quad1.c => tst-x86_64-1.c} (87%)
 copy sysdeps/x86_64/{multiarch/strcmp-sse4_2.S => tst-x86_64mod-1.c} (90%)

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