[PR72741] Encode OpenACC 'routine' directive's level of parallelism inside Fortran module files

[Thomas Koenig]

Am 13.03.19 um 18:50 schrieb Thomas Schwinge:
>> There are many ways to deal with it without bumping MOD_VERSION in a
>> backwards but not forwards compatible way, so that a newer compiler will be
>> able to parse old *.mod files, and newer compiler new ones as long as this
>> problematic stuff doesn't appear in.
> Like the attached, actually pretty simple now?

Can you explain a) how this works, and b) how you tested it?