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git: rtld: Use DAGS for symbol lookup; adjust weak symbol logic

From: John Marino <marino@xxxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 23 Jan 2012 08:15:11 -0800 (PST)

commit 153ab39206bda82ee461410163ae0f433bcb2629
Author: John Marino <draco@marino.st>
Date:   Sat Jan 21 22:35:24 2012 +0100

    rtld: Use DAGS for symbol lookup; adjust weak symbol logic
    get_program_var_addr() must prefer the strong symbol to the weak one.
    Search global objects, together with main object and dependencies for the
    requested symbol.
    Move the common code from symlook_default() into new helper
    symlook_global(), and use it both in symlook_global() and
    get_program_var_addr().  Supply lock state to get_program_var_addr().
    Taken-from: FreeBSD SVN 217223 (10 JAN 2011)
    Eliminate the use of symlook_needed function in favor of DAGS.  Place
    elements on DAG lists in breadth-first order. This allows us to walk
    pre-built list in all cases where breadth-first dependency chain
    enumeration is required.
    Fix dlsym on special handle obtained by dlopen(NULL, ...) to do what
    comment claims it does. Take advantage of recently added symlook_global
    function to iterate over main objects and global DAGs lists properly in
    search of a symbol. Since rtld itself provides part of the global
    namespace, search rtld_obj too.
    Remove recursion from init_dag and symlook_needed functions. Use
    symlook_needed for ELF filtee processing only and change lookup order
    used in the function to match the order used by Solaris runtime linker
    under same circumstances. While there, fix weak symbol handling in the
    loop so that we return the first weak symbol definition if no strong one
    was found, instead of the last one.
    Taken-from: FreeBSD SVN 218051 (28 JAN 2011)

Summary of changes:
 libexec/rtld-elf/rtld.c |  246 ++++++++++++++++++++++++-----------------------
 1 files changed, 125 insertions(+), 121 deletions(-)


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