[RFC] fortran PortGroup

[Maximilian Nickel]

Hi,
since all the ports that depend on fortran either drown in gcc
variants or don't create variants for all gcc/g95 versions i've
decided to create a litte PortGroup for
ports that need fortran.
The file for the PortGroup is attached and it would be great to have
some comments/thoughts on it. It looks a bit messy as i've decided to
go down the metaprogramming path and not explicitly write down every
variant. I'm by no means a Tcl expert so maybe all this can be
achieved a lot easier, but that's the version i've come up with that
works.

Usage of the group would be something like
PortGroup       fortran 1.0
fortran.setup

fortran versions that should be explicitly disabled can be stated as
arguments to fortran.setup (what might be a bit unintuitive).
Error handling and other reasonableness is missing.

Cheers
/Max
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