[Bug fortran/88052] Format contravening f2008 constraint C1002 permitted

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88052

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P5
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-11-16
                 CC|                            |jvdelisle at gcc dot gnu.org
     Ever confirmed|0                           |1
           Severity|normal                      |enhancement

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Confirmed from at least 4.8 up to trunk (9.0).

The missing comma is diagnosed at compile time for

  print "(AF9.6)", 'pi =',4*atan(1.0)

or

  print 10, 'pi =',4*atan(1.0)
10 format(AF9.6)

AFAIU for

  print fmt, 'pi =',4*atan(1.0)

the parsing of fmt is done at run time without provision for standard checking.

This is related to pr28397 and pr35844, both rotting since a very long time.