[Dwarf-Discuss] About DW_AT_external

Michael Eager eager at eagercon.com
Wed Jul 28 11:40:44 PDT 2010


P J P wrote:
> --- On Wed, 28/7/10, Michael Eager <eager at eagercon.com> wrote:
>> The DIE for "malloc" should have DW_AT_external where it is
>> defined, not in places the symbol is referenced.
>>
>> DIEs for non-defining declarations should have the
>> DW_AT_declaration flag.
>>
> 
> Please see: http://www.fpaste.org/DvLd/
> 
> It's a C++ program: greeting.cpp, with it's output and some dwarf information.
> 
> Above output shows that, both the symbols, the ones defined in greeting.cpp and the ones coming from standard library by way of linking have - external & declaration - flags set. 
>
> The static_function has - external & declaration - flags unset.
> The main function has - external set - & - declaration unset.
> 
> 
> That makes it a little confusing to know which functions are defined in the same compilation unit and which come from outside. 

There's sometimes a difference between what a standard
says and what implementation actually do.

If you believe that you have found a bug in g++,
you should discuss this on gcc-help at gcc.gnu.org.

-- 
Michael Eager	 eager at eagercon.com
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077




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