[Bug binutils/27391] [readelf] Handle absolute DW_AT_dwo_name

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27391

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The master branch has been updated by Tom de Vries <vries@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=d9d9d8ef8ce984dee45f35a5f00f4cf74bcab1e6

commit d9d9d8ef8ce984dee45f35a5f00f4cf74bcab1e6
Author: Tom de Vries <tdevries@suse.de>
Date:   Wed Feb 10 17:26:50 2021 +0100

    [binutils] Handle absolute DW_AT_dwo_name

    With an exec:
    ...
    $ pwd
    /home/vries/tmp
    $ gcc /home/vries/tmp/src/hello.c -gsplit-dwarf -c \
      -o /home/vries/tmp/obj/hello.o
    ...
    I get:
    ...
    $ readelf -w obj/hello.o > READELF
    readelf: Warning: Unable to load dwo file: \
      /home/vries/tmp//home/vries/tmp/obj/hello.dwo
    ...

    The dwo file name is listed here:
    ...
        <20>   DW_AT_GNU_dwo_name: /home/vries/tmp/obj/hello.dwo
        <24>   DW_AT_comp_dir    : /home/vries/tmp
    ...

    The standard states about the DW_AT_dwo_name attribute:
    ...
    value is a null-terminated string containing the full or relative path name
    (relative to the value of the DW_AT_comp_dir attribute, see below) of the
    object file that contains the full compilation unit.
    ...

    So, readelf shouldn't try to prefix an absolute path with DW_AT_comp_dir.

    Fix this in load_dwo_file by handling the absolute path case.

    binutils/ChangeLog:

    2021-02-10  Tom de Vries  <tdevries@suse.de>

            PR binutils/27391
            * dwarf.c (load_dwo_file): Handle case that name is absolute path.

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