eigen3 does not appear to install any architecture-specific files

[ryandesign (Ryan Carsten Schmidt)]

The eigen3 port has a universal variant, and even contains lots of code for handling the universal variant—but the port doesn't seem to actually install any architecture-specific files, so it shouldn't have a universal variant, and should instead specify "supported_archs noarch".

$ port installed eigen3
The following ports are currently installed:
  eigen3 @3.1.1_1+cmake+universal (active)
$ port -q contents eigen3 | xargs file | grep 86
$

Unless of course the port is supposed to be installing some architecture-specific files and isn't, in which was that should be fixed.

[eborisch (Eric A. Borisch)]

The +blas variant installs a library. Should it change its universal-ness based on the variant being enabled?

[ryandesign (Ryan Carsten Schmidt)]

Yes, a port should correctly indicate the architectures of the files it will install. If you're not installing architecture-specific files, you should use "supported_archs noarch". That would turn off the automatic universal variant, but since eigen3 is adding a manual universal variant you may need to manually disable it (or only declare it in the first place inside the blas variant).

I also see gcc variants. Does it make sense to select them if the blas variant is not also selected? Since there doesn't seem to be anything else to compile.

[eborisch (Eric A. Borisch)]

Resolved in r98001. When installed w/o +blas, disable universal variant (set noarch). Warn when +gcc4N selected w/o +blas.