https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85855
Bug ID: 85855
Summary: [7 Regression] (Maybe) uninitialized descriptor fields
of an allocatable array component of a function result
Product: gcc
Version: 7.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: vladimir.fuka at gmail dot com
Target Milestone: ---
This code does not issue any warning in GCC 4.8 to 6 but does for GCC 7.3.1:
module test
implicit none
type grid
integer, allocatable :: mask(:,:,:)
end type
contains
function reduce(g) result(res)
type(grid) :: res
class(grid), intent(in) :: g
res%mask = g%mask
end function
end module
> gfortran-7 -c uninit2.f90 -fbacktrace -g -Wall
uninit2.f90:14:0:
res%mask = g%mask
Warning: ‘res.mask.offset’ is used uninitialized in this function
[-Wuninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[0].lbound’ is used uninitialized in
this function [-Wuninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[0].ubound’ is used uninitialized in
this function [-Wuninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[1].lbound’ is used uninitialized in
this function [-Wuninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[1].ubound’ is used uninitialized in
this function [-Wuninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[2].lbound’ is used uninitialized in
this function [-Wuninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[2].ubound’ is used uninitialized in
this function [-Wuninitialized]
uninit2.f90:14:0:
res%mask = g%mask
Warning: ‘res.mask.dim[0].lbound’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[0].ubound’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[1].lbound’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[1].ubound’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[2].lbound’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[2].ubound’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[0].ubound’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[0].lbound’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[1].ubound’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[1].lbound’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[2].ubound’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
uninit2.f90:14:0: Warning: ‘res.mask.dim[2].lbound’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
