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

[vries at gcc dot gnu.org]

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

            Bug ID: 27391
           Summary: [readelf] Handle absolute DW_AT_dwo_name
           Product: binutils
           Version: 2.37 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

With the fission-mix executable from the gdb testsuite, I run into:
...
$ ~/binutils/install/bin/readelf -w fission-mix > READELF
readelf: Warning: Unable to load dwo file:
/home/vries/gdb_versions/devel/build/gdb/testsuite//home/vries/gdb_versions/devel/build/gdb/testsuite/outputs/gdb.dwarf2/fission-mix/fission-mix2.dwo
...

At the start we find:
...
The .debug_info section contains link(s) to dwo file(s):

  Name:     
/home/vries/gdb_versions/devel/build/gdb/testsuite/outputs/gdb.dwarf2/fission-mix/fission-mix2.dwo
  Directory: /home/vries/gdb_versions/devel/build/gdb/testsuite
  ID:        <not specified>
...
and later-on the part from where we get this info:
...
  Compilation Unit @ offset 0x176:
   Length:        0x31 (32-bit)
   Version:       5
   Unit Type:     DW_UT_skeleton (4)
   Abbrev Offset: 0xfd
   Pointer Size:  8
 <0><18a>: Abbrev Number: 1 (DW_TAG_skeleton_unit)
    <18b>   DW_AT_low_pc      : 0x4004cf
    <193>   DW_AT_high_pc     : 0x15
    <19b>   DW_AT_stmt_list   : 0x14d
    <19f>   DW_AT_dwo_name    :
/home/vries/gdb_versions/devel/build/gdb/testsuite/outputs/gdb.dwarf2/fission-mix/fission-mix2.dwo
    <1a3>   DW_AT_comp_dir    :
/home/vries/gdb_versions/devel/build/gdb/testsuite
    <1a7>   DW_AT_GNU_pubnames: 1
    <1a7>   DW_AT_addr_base   : 0x8
...

In the dwarf-5 standard we read:
...
A skeleton compilation unit has a DW_AT_dwo_name attribute:
1. A DW_AT_dwo_name attribute whose 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, the name only needs to be prefixed with the dir if it's relative.

In this case, the name is already absolute and readelf shouldn't try to add the
dir prefix.

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