Commits on Sep 10, 2024

1. [flang] Downgrade error message to warning …

   It is a non-mandatory error to reference an external procedure
   via an implicit interface declaration (EXTERNAL or PROCEDURE())
   when the external procedure has an interface that requires the
   presence of an explicit interface to be called.
   
   Until now, the compiler has issued a fatal error message from
   semantics for this situation.  But (1) there are situations,
   such as passing such an EXTERNAL as an actual argument, or
   as the target of a procedure pointer assignment, where little
   or no harm is done, (2) other compilers don't/can't detect this
   error, even when the procedure's definition is in the same source
   file, and (3) it shows up in some real applications.
   
   So downgrade this error to a stern warning.  Perhaps in the future
   the compiler could resume emission of a hard error in the cases
   where the EXTERNAL procedure is actually known to be called via
   its implicit interface.

   

   klausler committed Sep 10, 2024
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