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Subject: [Bug fortran/56174] New: Wrongly accepts "INTEGER :: b = HUGE(b)"
Date: Fri, 01 Feb 2013 14:26:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D56174

             Bug #: 56174
           Summary: Wrongly accepts "INTEGER :: b =3D HUGE(b)"
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Keywords: accepts-invalid
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: burnus@gcc.gnu.org


As reported at
https://groups.google.com/forum/?fromgroups=3D#!topic/comp.lang.fortran/T9Q=
QNONepKM


Using
  INTEGER, PARAMETER :: a(2) =3D (/ 1, 2 /), b =3D HUGE(b)
is invalid per the arguments given below.

Note, however, that
  INTEGER, PARAMETER :: a(2) =3D (/ 1, 2 /), b =3D HUGE(a)
is valid.

gfortran currently accepts it.


Fortran 2008 has in "7.1.12 Constant expression" (paragraph below C712):

"If a constant expression includes a specification inquiry that depends
on a type parameter or an array bound of an entity specified in the
same speci=0Ccation-part, the type parameter or array bound shall be
specified in a prior specification of the specification-part. The prior
specification may be to the left of the specification inquiry in the
same statement, but shall not be within the same entity-decl."


The latter is:

R503  entity-decl  is  object-name [( array-spec )]
                           [ lbracket coarray-spec rbracket ]
                           [ * char-length ] [ initialization ]
                    or  function-name [ * char-length ]

Thus, "object-name ... initialization" belongs to the same entry-decl.


"HUGE" belongs to the class "Inquiry function" and (cf. 7.1.11
Specification expression):

"A specification inquiry is a reference to
"(1) an intrinsic inquiry function, [...]"