RFC on PR77828 and internal units

[Dominique d'Humières]

Dear Andre,

> But do you by chance have a list of PRs, that require API version change,
> you can point out, even if incomplete?
An outstanding PR is pr36825: [F2008] Rank > 7 arrays [will break library ABI] libgfortran I/O+intrinsics.
You can also have a look at pr37577.

See also https://gcc.gnu.org/wiki/LibgfortranAbiCleanup and https://gcc.gnu.org/wiki/ArrayDescriptorUpdate.
Note that Paul has resurrected fortran-dev, but I doubt it will make it for gcc-7.

Good luck,

Dominique