Migration issue

[Adam Dershowitz]

> On Jan 3, 2017, at 8:13 PM, Adam Dershowitz <dersh at alum.mit.edu> wrote:
> 
> Yes, xar. 
> That port actually got fixed quickly, so the specific problem is gone.
> But, the situation still has me curious. Why should just moving myports.txt end up with a bunch more universal ports on the new machine? Is it a difference between 10.11 and 10.12?
> 
> On January 3, 2017 7:35:00 PM EST, Ryan Schmidt <ryandesign at macports.org> wrote:
> 
>  On Jan 2, 2017, at 14:12, Adam Dershowitz <dersh at alum.mit.edu> wrote:
>  
>  I am trying to get an existing set of ports into a new machine. 
>  I ended up wiping /opt/local on the new machine, so I'm just using the migration script and myports.txt. So it is a fresh macports install.
>  My problem seems to be that I had Xer installed on the old machine (2012 MacBook pro with OS 10.11 ) as a dependant to something else. On the new machine it keeps trying to put xer +universal. And that build fails. (I create a ticket for the xer +universal build.)
>  But I would like to be able to get other ports working. Can anyone suggest why it wants to install this port +universal variant, when the old machine was not? 
>  I can install the default variant, which grabs the binary. But, then when I try to run the migration script it tries to upgrade to the other variant, from source, and fails.
>  I did try removing the xer line from myports.txt but it didn't help (the line just had the default variant)
>  
> 
> I don't see a port "xer"; I assume you mean "xar".
> 
> I guess you're trying to install a port that depends on xar. llvm-3.9 depends on xar, and cctools and ld64 depend on llvm-3.9. Maybe you're trying to install one of those with the universal variant.
> 
> 
> 
> 
> 
> --Adam

So, yes it seems that the on the new machine I ended up with gcc6 being universal, so then cctools, ld64-latest, llvm-3.9 etc are all universal.  But, the strange thing is that gcc6 has no dependents, and I didn’t explicitly install it.  So, I’m not sure what caused it to be installed.  And, on the new machine it, and the chain down, installed +universal, while on the older machine it installed the default variant.  Both computers installed gcc6 6.2.0_2.  
So, my academic question is why did this happen?  And, the related questions are what port would have installed gcc6? Since I see this:
$port dependents gcc6
gcc6 has no dependents.

And, is there an easy way to figure out which ports don’t actually have to be universal and to uninstall them as universal and reinstall them as default, given the whole chain of dependents?  
It seems to me that +universal end up much larger, and also take longer to build, since mostly the buildbots provide just default variants.  

thanks,

—Adam

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