[Bug c++/51832] [4.7 regression] Rev.182970 causes LTO link errors (multiple definitions of allocator_traits)

[markus at trippelsdorf dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51832

--- Comment #17 from Markus Trippelsdorf <markus at trippelsdorf dot de> 2012-01-19 18:18:03 UTC ---
I ran git bisected on ld.bfd. Since this commit my testcase fails:

4b96312bb623ba76b035ac3b3c5afe583bebca76 is the first bad commit
commit 4b96312bb623ba76b035ac3b3c5afe583bebca76
Author: Alan Modra <amodra@bigpond.net.au>
Date:   Sun Apr 17 23:15:11 2011 +0000

        PR ld/12365
        PR ld/12672
    bfd/
        * bfd.c (BFD_PLUGIN): Define.
        (BFD_FLAGS_SAVED, BFD_FLAGS_FOR_BFD_USE_MASK): Add BFD_PLUGIN.
        * bfd-in2.h: Regenerate.
        * elflink.c (elf_link_output_extsym): Strip undefined plugin syms.
        * opncls.c (bfd_make_readable): Don't lose original bfd flags.
    ld/
        * ldfile.c (ldfile_try_open_bfd): Don't attempt any plugin action
        when no_more_claiming.
        * ldmain.c (add_archive_element): Likewise.
        (multiple_definition): Remove plugin_multiple_definition call.
        (notice): Remove plugin_notice call.
        * ldlang.c (lang_list_insert_after, void lang_list_remove_tail): Move.
        Delete prototype.
        (plugin_insert): New static var.
        (open_input_bfds): Only rescan libs after plugin insert point.
        (lang_gc_sections): Omit plugin claimed files.
        (lang_process): Set plugin_insert.  Only rescan when plugin adds
        objects.
        * plugin.h (no_more_claiming): Declare.
        (plugin_notice, plugin_multiple_definition): Don't declare.
        * plugin.c: Formatting.
        (orig_notice_all, orig_allow_multiple_defs, orig_callbacks,
        plugin_callbacks): New static vars.
        (no_more_claiming): Make global.
        (plugin_cached_allow_multiple_defs): Delete.
        (plugin_get_ir_dummy_bfd): Set SEC_EXCLUDE on dummy .text section,
        use newer bfd_make_section variant.  Make COMMON section too.
        Error handling.  Correct setting of gp size.
        (asymbol_from_plugin_symbol): Properly cast last arg of concat.
        (message): Likewise for ACONCAT.
        (asymbol_from_plugin_symbol): Use our COMMON section.
        (get_symbols): When report_plugin_symbols, show visibility too.
        (init_non_ironly_hash): Move.  Don't test non_ironly_hash.
        (plugin_load_plugins): Save state of linker callbacks, set up to
        call plugin_notice instead.  Call init_non_ironly_hash here.
        (plugin_call_all_symbols_read): Set plugin_multiple_definition in
        plugin callbacks.
        (plugin_notice): Rewrite.
        (plugin_multiple_definition): Make static, call original callback.
    ld/testsuite/
        * ld-plugin/plugin-7.d: Adjust for plugin changes.
        * ld-plugin/plugin-8.d: Likewise.
        * ld-plugin/plugin.exp: Pass --verbose=2 for visibility test, and
        compare ld output to..
        * ld-plugin/plugin-12.d: New