About DWARF DW_AT_external

[Ian Lance Taylor]

P J P <pj.pandit@yahoo.co.in> writes:

> --- On Thu, 29/7/10, Ian Lance Taylor <iant@google.com> wrote:
>> The former.  It is attached to a definition to mean
>> that the definition is externally visible.
>
>   Right. Then, should this flag be set for the variables/functions
>   coming from an outside object file through linking?
>
> Ex. Say an application uses standard library functions like malloc,
> scanf, operator>>, operator<< etc. The dwarf DIEs describing such
> symbols have the external flag set.
>
> Looking at the DIEs, is there any way of knowing which symbols are
> defined in the same object file and which ones come from other object
> files through linking?

I don't think I understand the question.  gcc does not normally generate
debug info for library functions which are only referenced, not defined.
Where is the debug info for these functions coming from?

Ian