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[Bug binutils/22782] ld.bfd large static binaries

From: cvs-commit at gcc dot gnu.org
Subject: [Bug binutils/22782] ld.bfd large static binaries
Date: Tue, 24 Apr 2018 22:36:57 +0000


--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The binutils-2_30-branch branch has been updated by Roland McGrath


commit 5cd720ad5beaacd9f8988af476871003aca1c58c
Author: H.J. Lu <address@hidden>
Date:   Mon Feb 5 08:38:16 2018 -0800

    x86: Remove the unused _GLOBAL_OFFSET_TABLE_

    Since _GLOBAL_OFFSET_TABLE_ may be referenced implicitly on x86,
    checking ref_regular_nonweak leaves the unused _GLOBAL_OFFSET_TABLE_
    in output.  This patch checks explicit GOT references instead.

    ld-i386/discarded1.s and ld-x86-64/discarded1.s are updated to avoid
    linker optimization which removes GOT references.


        PR ld/22782
        * elf32-i386.c (elf_i386_check_relocs): Set got_referenced if
        _GLOBAL_OFFSET_TABLE_ is referenced or GOT is needed to resolve
        undefined weak symbol to 0.
        * elf64-x86-64.c (elf_x86_64_check_relocs): Set got_referenced
        if _GLOBAL_OFFSET_TABLE_ is referenced.
        * elfxx-x86.c (_bfd_x86_elf_size_dynamic_sections): Check
        got_referenced instead of ref_regular_nonweak.  Remove the
        unused _GLOBAL_OFFSET_TABLE_ from symbol table.
        * elfxx-x86.h (elf_x86_link_hash_table): Add got_referenced.


        PR ld/22782
        * testsuite/ld-i386/discarded1.s: Replace mov with div.
        * testsuite/ld-x86-64/discarded1.s: Likewise.
        * testsuite/ld-i386/i386.exp: Run pr22782.
        * testsuite/ld-i386/load1-nacl.d: Updated for removing
        _GLOBAL_OFFSET_TABLE_ from output.
        * testsuite/ld-i386/load1.d: Likewise.
        * testsuite/ld-x86-64/load1a-nacl.d: Likewise.
        * testsuite/ld-x86-64/load1a.d: Likewise.
        * testsuite/ld-x86-64/load1b-nacl.d: Likewise.
        * testsuite/ld-x86-64/load1b.d: Likewise.
        * testsuite/ld-i386/pr22782.d: New file.
        * testsuite/ld-i386/pr22782.s: Likewise.
        * testsuite/ld-x86-64/pr22782.s: Likewise.
        * testsuite/ld-x86-64/pr22782a.d: Likewise.
        * testsuite/ld-x86-64/pr22782b.d: Likewise.
        * testsuite/ld-x86-64/x86-64.exp: Run pr22782a and pr22782b.

    (cherry picked from commit cd04836359da82ae1dc67e5a05565536f4427b51)

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