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Re: DW_AT_const_value duplicated between DW_TAG_variable abstract declaration and instance


> I just filed this bug report:
> https://bugzilla.redhat.com/show_bug.cgi?id=527430
> It shows gcc producing a duplicate DW_AT_const_value for a
> DW_TAG_variable where the value is already in the referenced
> DW_AT_abstract_origin.
> 
> Maybe this is something that dwarflint can check/warn for and/or removed
> by the dwarf compressor/writer when found.

A generic dwarflint check sounds right for this.  If a given attribute name
is present on a DIE, it is suspicious if that attribute name appears on the
DIE that's the first DIE's DW_AT_abstract_origin or DW_AT_specification.
If the two attribute values are not identical, it's either more or less
suspicious, but merits specifically mentioning whether it's a superfluous
identical override or a curious nonidentical override.

We may one day have canonicalization logic that fixes these things from old
producers, but more likely we'll just get the new compilers fixed not to do
it and avoid having our transformations make any semantic changes to old data.


Thanks,
Roland

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