flang port

[Jack Howarth]

   Since the legacy header support for avoiding the availability attribute
has been dropped from the 10.15 SDK...

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90835

and it is unclear when and if the missing availability attribute support
will be added to FSF gcc, the path of least resistance might be to get a
flang package into MacPorts to replace gfortran.
     Currently flang doesn't build on macOS...

https://github.com/flang-compiler/flang/issues/678
https://github.com/flang-compiler/flang/issues/212

https://github.com/flang-compiler/flang/pull/592

As a side note, Ubuntu has added a flang package since their Disco release.
                   Jack
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