Re: gdb 5.0 "ia64-unknown-linux" segv error

[David B Anderson]

kevinb writes:
> <1><96d50>: Abbrev Number: 12 (DW_TAG_typedef)
>     DW_AT_name        : ulong  
>     DW_AT_decl_file   : 12     
>     DW_AT_decl_line   : 59     
>     DW_AT_type        : <96d50>        
>
>I'm not a DWARF2 expert, but it looks to me like the above is a
>self referential typedef.  This would explain why you're seeing
>the infinite recursion in dwarf2read.c.

Yes, it is a bug. This is not correct dwarf2.

I was going to say it was 'illegal' dwarf2, but the spec
does not quite allow me to say that:
the spec:

.H 2 "Typedef Entries"
.IX typedefs
Any arbitrary type named via a typedef is represented
by a debugging information entry with the tag
.Cf DW_TAG_typedef .
The typedef entry has a
.Cf DW_AT_name
attribute whose value is a null-terminated
string containing the name of the typedef as it appears in the
source program.
The typedef entry also contains a
.Cf DW_AT_type
attribute.

The above is the same in the latest draft dwarf2 spec.

It is clear from context though, that the DW_AT_type
should be a reference to 'the type the ulong name refers to'
in the example at hand.


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