[Bug ld/17550] Section groups (comdat/linkonce) create undefined symbols unnecessarily

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17550

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The master branch has been updated by H.J. Lu <address@hidden>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=97196564c7e981bab7b968e19b171c5dfcb28c3c

commit 97196564c7e981bab7b968e19b171c5dfcb28c3c
Author: H.J. Lu <address@hidden>
Date:   Fri May 6 09:46:34 2016 -0700

    Strip global symbol defined in discarded section

    When a global symbol is defined in COMDAT group, we shouldn't leave an
    undefined symbol in symbol table when the symbol section is discarded
    unless there is a reference to the symbol outside of COMDAT group.

    bfd/

        PR ld/17550
        * elf-bfd.h (elf_link_hash_entry): Update comments for indx,
        documenting that indx == -3 if symbol is defined in a discarded
        section.
        * elflink.c (elf_link_add_object_symbols): Set indx to -3 if
        symbol is defined in a discarded section.
        (elf_link_output_extsym): Strip a global symbol defined in a
        discarded section.

    ld/

        PR ld/17550
        * testsuite/ld-elf/pr17550-1.s: New file.
        * testsuite/ld-elf/pr17550-2.s: Likewise.
        * testsuite/ld-elf/pr17550-3.s: Likewise.
        * testsuite/ld-elf/pr17550-4.s: Likewise.
        * testsuite/ld-elf/pr17550a.d: Likewise.
        * testsuite/ld-elf/pr17550b.d: Likewise.
        * testsuite/ld-elf/pr17550c.d: Likewise.
        * testsuite/ld-elf/pr17550d.d: Likewise.

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