[RFC] PING [Re: [PATCH] Fix macro info lookup for binaries containing DWARFv5 line table]

[Keith Seitz via Gdb-patches <gdb-patches@sourceware.org>]

I think this might be something we should consider including in gdb-11.

Keith

On 6/8/21 11:48 AM, Keith Seitz via Gdb-patches wrote:
> RFC ping
> 
> Anyone at all have an opinion on this direction?
> 
> Keith
> 
> On 5/24/21 11:47 AM, Keith Seitz via Gdb-patches wrote:
>> On 5/24/21 4:36 AM, Tomar, Sourabh Singh wrote:
>>> [AMD Public Use]
>>>
>>> Hello Keith,
>>>
>>> Could you please share your plan WRT to this patch.
>>> Do you want to take it forward ? or you want me to take this forward.
>>>
>>
>> I can pursue this...
>>
>> In that vein, does anyone (maintainers?) have an input on my "counterpatch"
>> (reposted below) that removes this IS_ABSOLUTE_PREFIX stuff and copies the
>> symtab's filename?
>>
>> I haven't officially submitted this as a patch because I'm curious whether
>> my reading of this is correct/complete. Maybe the documentation/comments
>> are incorrect or no longer valid? 
>>
>> FWIW, I've tested that patch on native x86_64 Fedora 34 with no regressions.
>>
>> Keith
>>
>> Patch under discussion:
>>
>> gdb/ChangeLog
>>
>> 	* dwarf2/line-header.c (line_header::file_file_name): Copy
>> 	the symtab's filename.
>>
>> diff --git a/gdb/dwarf2/line-header.c b/gdb/dwarf2/line-header.c
>> index 7575297f966..117c5a42cc5 100644
>> --- a/gdb/dwarf2/line-header.c
>> +++ b/gdb/dwarf2/line-header.c
>> @@ -69,15 +69,10 @@ line_header::file_file_name (int file) const
>>      {
>>        const file_entry *fe = file_name_at (file);
>>  
>> -      if (!IS_ABSOLUTE_PATH (fe->name))
>> -	{
>> -	  const char *dir = fe->include_dir (this);
>> -	  if (dir != NULL)
>> -	    return gdb::unique_xmalloc_ptr<char> (concat (dir, SLASH_STRING,
>> -							  fe->name,
>> -							  (char *) NULL));
>> -	}
>> -      return make_unique_xstrdup (fe->name);
>> +      /* macro_source_file requires: "This filename is relative to the
>> +	 compilation directory, it exactly matches the symtab->filename
>> +	 content."  */
>> +      return make_unique_xstrdup (fe->symtab->filename);
>>      }
>>    else
>>      {
>>
>