[Bug symtab/25969] New: Ignoring .debug_aranges with clang .debug_names

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25969

            Bug ID: 25969
           Summary: Ignoring .debug_aranges with clang .debug_names
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

[ Spinoff PR of PR25941 . ]

Consider the patch and test-case submitted in
https://sourceware.org/pipermail/gdb-patches/2020-May/168179.html .

That is, test-case test.c:
...
int
main (void)
{
 int sum,a,b;
 sum = a + b;
 return sum;
}
...

Compiled liked so:
...
$ clang-10 test.c -gdwarf-5 -o test.out -gpubnames 
..

When loading into gdb, we have:
...
$ gdb test.out
warning: Section .debug_aranges in /data/gdb_versions/devel/test.out entry at
offset 0 debug_info_offset 0 does not exists, ignoring .debug_aranges.
...

The .debug_aranges warning triggers because the .debug_aranges section contains
one entry:
...
debug_aranges contents:
Address Range Header: length = 0x0000002c, version = 0x0002, cu_offset =
0x00000000, addr_size = 0x08, seg_size = 0x00
[0x00000000004003c0,  0x00000000004003eb)
...
which refers to the CU at offset 0, but the CU list (based on the CU list in
.debug_names) only contains the one at 0xc7, so we fail to find it.

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