Setting up MacPorts libsolv branch and Testing libsolv search

[Ryan Schmidt]

On Jun 23, 2015, at 3:24 AM, Clemens Lang wrote:

> On 23 Jun, 2015, at 01:07, Joshua Root wrote:
> 
>> How are you planning on handling variants? It seems to me that the only
>> tractable approach would be to evaluate the package universe lazily,
>> running mportopen to get data from portfiles only when it is required.
> 
> I've been in contact with the developer of libsolv about that and my
> current approach would be to represent every variant separately in the
> package universe, e.g. a port A with the variants var1, var2, var3 with a
> conflict between var2 and var3 and an additional dependency on C in var1
> would become
> 
> portA+0 (i.e. without variants)
>  Provides: portA
> 
> portA+var1
>  Provides: portA
>  Requires: portC
> 
> portA+var2
>  Provides: portA
>  Conflicts portA+var3
> 
> portA+var3
>  Provides: portA
>  Conflicts: portA+var2

What about portA+var1+var2 and portA+var1+var3? Exponential explosion of combinations?