[PyQt] SIP and multiple inheritance ambiguity

[Scott Talbert]

On Mon, 6 Jun 2016, Scott Talbert wrote:

>> Hi,
>> 
>> I'm trying to wrap a set of classes that have a diamond multiple 
>> inheritance hierarchy (A inherits from B and C; B and C inherit from D).
>> 
>> When SIP generates the cast_A function, it won't compile under GCC 6.1.1 
>> due to an ambiguous base error:
>> error: 'D' is an ambiguous base of 'A'
>>         return static_cast<D *>(sipCpp);
>> 
>> Any ideas on how to work around this, other than hand editing the cast_X 
>> function?
>
> Actually, I was wrong about this being related to a change in GCC.  It turns 
> out this is related to a SIP change in 4.18:
> https://www.riverbankcomputing.com/hg/sip/rev/14bfbaf7431a
>
> I'm thinking SIP could possibly check the list of target types and if there 
> are duplicates, it could omit those from the cast function?

Simple patch attached.

Scott
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