[Bug gold/16992] libQtGui linked with gold crashes all Qt programs on startup

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16992

--- Comment #13 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The master branch has been updated by Cary Coutant <address@hidden>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=e9c1bdad269c0c3352eebcc9481ed65144001b0b

commit e9c1bdad269c0c3352eebcc9481ed65144001b0b
Author: Cary Coutant <address@hidden>
Date:   Mon Feb 16 22:15:12 2015 -0800

    Fix --dynamic-list so that symbols not in the list are still exported.

    In PR 13577, the complaint was that -Bsymbolic was overriding the binding
    behavior for symbols listed in the --dynamic-list by setting the
DT_SYMBOLIC
    tag in the dynamic table. In reading the Gnu ld manual, I decided that
    --dynamic-list should be mutually exclusive of -Bsymbolic, and modified
    gold so that --dynamic-list would treat symbols listed as preemptible,
    and all other symbols as internally bound. I was wrong.

    PR 16992 shows that with --dynamic-list (and not -Bsymbolic), a symbol
    not listed in the dynamic list is being internally bound within the
    shared library, but because it's still in the dynamic symbol table, we
    expose it to a COPY relocation, and things go really bad from there.

    (I can reproduce the same failure, simply by turning on
-Bsymbolic-functions
    with the Gnu linker. Even though the symbol is bound internally, it's
    still exported to the dynamic symbol table, and is exposed to a COPY
    relocation.)

    I've backed out part of the fix for PR 13577, and -Bsymbolic (or
    -Bsymbolic-functions) can now be used with --dynamic-list, but if the
    two are used together, we do not set DT_SYMBOLIC or DF_SYMBOLIC
    (this matches Gnu ld behavior). We now treat symbols listed in the
    dynamic list as premptible, but we do not automatically treat symbols
    not listed there as non-premptible.

    gold/
        PR gold/13577
        PR gold/16992
        * layout.cc (Layout::finish_dynamic_section): Don't set DT_SYMBOLIC or
        DF_SYMBOLIC if --dynamic-list option is used.
        * options.cc (General_options::finalize): --dynamic-list is not
        mutually exclusive with -Bsymbolic.
        * symtab.h (Symbol::is_preemptible): Don't exclude dynamic symbols not
        listed in --dynamic-list.
        * testsuite/Makefile.am (dynamic_list_lib2.so): Add
        -Bsymbolic-functions.
        * testsuite/Makefile.in: Regenerate.

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