https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70312
Bug ID: 70312
Summary: Spurious -Wsurprising warnings for final subroutines
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: neil.n.carlson at gmail dot com
Target Milestone: ---
-Wsurprising issues spurious warnings about final procedures.
module foo_type
type foo
contains
final :: foo_delete
end type
contains
subroutine foo_delete (this)
type(foo), intent(inout) :: this
end subroutine
end module
program main
use foo_type
end program
Compiling with "gfortran -Wsurprising" gives:
gfortran-bug-20160319.f90:13:6:
use foo_type
1
Warning: Only array FINAL procedures declared for derived type ‘foo’ defined at
(1), suggest also scalar one [-Wsurprising]
But the final subroutine was a scalar one. Perhaps the intended message was
"Only scalar FINAL ..., suggest also array one"?
Making the subroutine elemental
elemental subroutine foo_delete (this)
type(foo), intent(inout) :: this(:)
end subroutine
gives the same warning message, which is also incorrect.
Aside from issuing only valid warning messages, the larger question is how
thorough should -Wsurprising be. Apart from an elemental final subroutine, one
needs to be provided for scalar and *every* possible rank of array in order to
ensure all possibilities are covered. Should -Wsurprising be warning for each
and every missing one?
