[2/6] widl: Ignore assigment of a duplicate uuid.

[Dmitry Timoshkov]

Alexandre Julliard <julliard at winehq.org> wrote:

> >> ../../tools/widl/widl -o msxml3_v1_t.res -m32 -I. -I../../include -I/usr/include/libxml2 -D__WINESRC__ \
> >>   msxml3_v1.idl
> >> warning: duplicate uuid {50ea08b4-dd1b-4664-9a50-c2f40f4bd79a}
> >> (plus the same warnings in other msxml* directories).
> >> 
> >> This is ISchema.  Not sure why this is happening.
> >
> > The warning is emitted because the hash keys returned by ctl2_hash_guid()
> > for IXMLDOMSchemaCollection2 (50ea08b0-dd1b-4664-9a50-c2f40f4bd79a) and
> > ISchema (50ea08b4-dd1b-4664-9a50-c2f40f4bd79a) are the same. It seems to
> > me a bit inadequate that ctl2_hash_guid() does 'return hash & 0x1f'. But
> > I think that fixing this problem is outside of the scope of my patches
> > and deserves a separate investigation.
> 
> If a hash collision triggers a warning that would definitely be a bug in
> your code, but I don't think that's the reason here.

Do you have an idea what might be a reason of the collision?

-- 
Dmitry.