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[Bug binutils/23611] objcopy is not removing the sections like .rela.plt

From: cvs-commit at gcc dot gnu.org
Subject: [Bug binutils/23611] objcopy is not removing the sections like .rela.plt and rela.dyn.
Date: Mon, 10 Sep 2018 04:33:40 +0000


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


commit f9853190c8d90e9f7d43fae90478a0db291f9c03
Author: Alan Modra <address@hidden>
Date:   Mon Sep 10 11:57:08 2018 +0930

    PR23611, objcopy is not removing executable relocatable sections

    BFD handles ELF relocation sections in an executable differently to
    relocation sections in a relocatable object.  For a relocatable
    object, BFD carries the relocations as data associated with the
    section to which they apply; The relocation section doesn't appear as
    a separate section.  For an executable, dynamic relocation sections do
    appear as separate sections.  This means that objcopy needs to use
    different strategies when dealing with relocations.

    When --remove-relocations was added to objcopy with commit
    d3e5f6c8f1e, objcopy lost the ability to remove dynamic relocation
    sections such as .rela.plt from executables using the option
    "--remove-section=.rela.plt".  This patch reinstates that

    I thought it best to keep --remove-relocations as is, rather than
    extending to handle dynamic relocations as per the patch in the PR,
    because executables linked with --emit-relocs may have both dynamic
    and non-dynamic relocations.  In that case --remove-relocataions=* is
    useful to remove all the non-dynamic relocations.

        PR binutils/23611
        * objcopy.c (handle_remove_section_option): Consider .rela and
        .rel sections for stripping directly as well as attached to the
        associated section they relocate.
        * doc/binutils.texi (remove-relocations): Specify that this
        option removes non-dynamic relocation sections.
        * testsuite/binutils-all/objcopy.exp
        (objcopy_remove_relocations_from_executable): New test.

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