RFE: add --url option to download a package from a specific URL

[rouson]

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Request for Enhancement (RFE)

With the advent of the Sourcery Institute fork of GCC, it would be nice to be able to redirect the installer to grab a package from a different URL than the usual one. I'll work on adding a --url (or --URL?) option to facilitate something like the following, which would install the freshly minted release of a branch that provides experimental, partial support for Fortran 2015 teams:

./install.sh --package gcc --url https://github.com/sourceryinstitute/gcc/archive/teams.tar.gz

This will become increasingly useful if more gfortran/OpenCoarrays contributors are willing to push their compiler edits to a branch of the aforementioned fork rather than distributing patches, which can sometimes be tricky and time-consuming to apply.

[zbeekman]

And just when I think we're making progress on the issue backlog... 😄

I'm being silly, obviously. This is a good idea, and will certainly come in handy.

[rouson]

@zbeekman No worries. I just submitted a pull request that fixes this issue. I wanted to have a GCC build running in the background while I finish a proposal. ;)