[VTA merge] Some dwarf problems

[VTA merge] Some dwarf problems

[Hariharan]

Hi Alexandre,
I was having some trouble with dwarf sections in picochip port. I am not 
a dwarf expert, but when i looked at the changes in r151312, file 
dwarf2out.c, function dwarf2out_var_location on line 17965, we have

          sprintf (loclabel, "%s-1", last_label);
          ...

What is last_label-1 supposed to point to?

Thanks for your help.

Hari

Re: [VTA merge] Some dwarf problems

[Jack Howarth]

On Mon, Sep 21, 2009 at 05:04:27PM +0100, Hariharan wrote:
> Hi Alexandre,
> I was having some trouble with dwarf sections in picochip port. I am not  
> a dwarf expert, but when i looked@the changes in r151312, file  
> dwarf2out.c, function dwarf2out_var_location on line 17965, we have
>
>          sprintf (loclabel, "%s-1", last_label);
>          ...
>
> What is last_label-1 supposed to point to?
>
> Thanks for your help.
>
> Hari
>
>
Hari,
   Does the binutils on pico understand dwarf3/dwarf4? We ran into
breakage of the bootstrap on darwin...

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41405

due to r151815 which was based on the assumption that all
of the targets could handle dwarf3/dwarf4 instructions.
If not, a proposed patch for a -gstrict-dwarf option is
being worked on there.
             Jack

Re: [VTA merge] Some dwarf problems

[Jakub Jelinek]

On Mon, Sep 21, 2009 at 05:04:27PM +0100, Hariharan wrote:
> Hi Alexandre,
> I was having some trouble with dwarf sections in picochip port. I am not  
> a dwarf expert, but when i looked at the changes in r151312, file  
> dwarf2out.c, function dwarf2out_var_location on line 17965, we have
>
>          sprintf (loclabel, "%s-1", last_label);
>          ...
>
> What is last_label-1 supposed to point to?

See http://gcc.gnu.org/ml/gcc-patches/2009-06/msg01317.html
for details.  1 byte before last_label label (which is usually right after a
call insn).  The intent is to have something in the middle of a call insn.

	Jakub

Re: [VTA merge] Some dwarf problems

[Hariharan]

Thanks for the pointer, Jakub.

Cheers
Hari

Jakub Jelinek wrote:
> On Mon, Sep 21, 2009 at 05:04:27PM +0100, Hariharan wrote:
>   
>> Hi Alexandre,
>> I was having some trouble with dwarf sections in picochip port. I am not  
>> a dwarf expert, but when i looked at the changes in r151312, file  
>> dwarf2out.c, function dwarf2out_var_location on line 17965, we have
>>
>>          sprintf (loclabel, "%s-1", last_label);
>>          ...
>>
>> What is last_label-1 supposed to point to?
>>     
>
> See http://gcc.gnu.org/ml/gcc-patches/2009-06/msg01317.html
> for details.  1 byte before last_label label (which is usually right after a
> call insn).  The intent is to have something in the middle of a call insn.
>
> 	Jakub
>