Re: [PATCH] inconsistent DWARF2 sections generated by --gdwarf2

[Alan Modra <amodra at bigpond dot net dot au>]

On Thu, Nov 18, 2004 at 08:43:52AM +0000, Nick Clifton wrote:
> Hi Alan, Hi Bob,
> 
> >>probably harmless for GDB, but it breaks readelf, which expects a 
> >>one-to-one correspondence between .debug_info and .debug_line sections.  
> 
> >I would say that this is a readelf bug.  The only reason that readelf
> >needs .debug_info when dumping .debug_line is to find the size of
> >addresses.  readelf could guess that some other way.
> 
> I do not think so - the DWARF standard does specify that there there 
> should be a correspondence between the compilation units in the 
> .debug_info section and the compilation units in the .debug_line section:
> 
>   From "Section 6.2 Line number Information":
> 
>   As mentioned in Section 3.1.1, the line number information
>   generated for a compilation unit is represented in the
>   .debug_line section of an object file and is referenced by
>   corresponding compilation unit debugging information entry
>   in the .debug_info section.

But that's the other way around, .debug_info references .debug_line.  In
this case we have .debug_line with no .debug_info, which should be OK.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre