http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56174
Bug #: 56174
Summary: Wrongly accepts "INTEGER :: b = HUGE(b)"
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Keywords: accepts-invalid
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: bur...@gcc.gnu.org
As reported at
https://groups.google.com/forum/?fromgroups=#!topic/comp.lang.fortran/T9QQNONepKM
Using
INTEGER, PARAMETER :: a(2) = (/ 1, 2 /), b = HUGE(b)
is invalid per the arguments given below.
Note, however, that
INTEGER, PARAMETER :: a(2) = (/ 1, 2 /), b = 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 cation-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, [...]"
