[Bug dynamic-link/19509] dlsym, dlvsym do not report errors through dlerror when using RTLD_NEXT

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

https://sourceware.org/bugzilla/show_bug.cgi?id=19509

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=7d45c163d00c88d5875a112343c4ea3e61349e6b

commit 7d45c163d00c88d5875a112343c4ea3e61349e6b
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Mar 31 11:26:55 2016 +0200

    Report dlsym, dlvsym lookup errors using dlerror [BZ #19509]

        * elf/dl-lookup.c (_dl_lookup_symbol_x): Report error even if
        skip_map != NULL.
        * elf/tst-dlsym-error.c: New file.
        * elf/Makefile (tests): Add tst-dlsym-error.
        (tst-dlsym-error): Link against libdl.

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

Summary of changes:
 ChangeLog             |    9 ++++
 elf/Makefile          |    4 +-
 elf/dl-lookup.c       |    1 -
 elf/tst-dlsym-error.c |  113 +++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 125 insertions(+), 2 deletions(-)
 create mode 100644 elf/tst-dlsym-error.c

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