[Bug fortran/58000] New: Accept OPEN( ... NAME=) with -std=legacy

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58000

            Bug ID: 58000
           Summary: Accept OPEN( ... NAME=) with -std=legacy
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org

Some Fortran compilers supported:
   OPEN(99, NAME='filename')
while the Fortran standard only permits
   OPEN(99, FILE='filename')

I think it would be useful to also permit 'NAME=' with -std=legacy. And to
print a nice error message with -std=f*/gnu, which tells the user that the
proper specifier is "FILE=".

NAME is accepted by default by Absoft, Intel and PGI. (Intel warns with -stand
f95/f03 but still accepts it.) Sun/Oracle have "WARNING: NAME= will be ignored,
because -f77=input/output option is absent" - and accept it silently with
either suboption.

Note: It should be still rejected with -std=gnu as that's only part of legacy
code and given that many compiler do not support it. For instance: g95,
pathf95, gfortran, NAG f95 and crayftn don't.