[Bug dynamic-link/19178] ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses prelink

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19178

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The branch, hjl/pr19178/master has been created
        at  d8952eb0d100475c74c5f282ac32519389ee3e0c (commit)

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d8952eb0d100475c74c5f282ac32519389ee3e0c

commit d8952eb0d100475c74c5f282ac32519389ee3e0c
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Oct 28 07:49:44 2015 -0700

    Clear ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA for prelink

    prelink runs ld.so with the environment variable LD_TRACE_PRELINKING
    set to dump the relocation type class from _dl_debug_bindings.  prelink
    has the following relocation type classes:

    where ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA has a conflict with
    RTYPE_CLASS_TLS.

    Since prelink doesn't use ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA, we
    should clear the ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA bit when the
    DL_DEBUG_PRELINK bit is set.

        [BZ #19178]
        * elf/dl-lookup.c (RTYPE_CLASS_VALID): New.
        (RTYPE_CLASS_PLT): Likewise.
        (RTYPE_CLASS_COPY): Likewise.
        (RTYPE_CLASS_TLS): Likewise.
        (_dl_debug_bindings): Use RTYPE_CLASS_TLS and RTYPE_CLASS_VALID
        to set relocation type class for DL_DEBUG_PRELINK.  Clear the
        ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA bit for DL_DEBUG_PRELINK.

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