[Bug fortran/51268] [Regression] A subroutine can not know anymore its own interface

["burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51268

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |burnus at gcc dot gnu.org

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-11-22 16:09:19 UTC ---
Well, that one now gets a diagnostic and didn't get one before is a change, but
the question is whether it is a progression or a regression.

NAG prints:
  Error: line 15: USE MYINTERFACES in program-unit MYSUB imports symbol MYSUB

g95 prints:
  Module 'myinterfaces' at (1) redefines the current program unit 'mysub'

pathf95 prints:
  "MYSUB" is the name of this program unit, therefore it must not be use 
  associated from module "MYINTERFACES".

openf95 prints:
  "MYSUB" is the name of this program unit, therefore it must not be use 
  associated from module "MYINTERFACES".

crayftn prints:
  "MYSUB" is the name of this program unit, therefore it must not be use 
  associated from module "MYINTERFACES".

While ifort prints (only with -stand f95/f03):
  warning #7925: An interface-block in a subprogram shall not contain an
  interface-body for a procedure defined by that subprogram.   [MYSUB]

And "pgf90 -Minfo=all" and "sunf95 -w0" simply silently accept the program.


I think the program is indeed invalid - but if needed, I can check the
standard. One could consider allowing it with a warning (as ifort does), but I
am not sure one should.