https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87968
Bug ID: 87968
Summary: [7/8/9 Regression] Warning about uninizialized
variables in array constructor
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: tkoenig at gcc dot gnu.org
Target Milestone: ---
$ cat a.f90
program main
integer, parameter :: dp = selected_real_kind(15)
real(kind=dp) :: v1(3), v2(4)
real(kind=dp), allocatable :: vv(:)
v1 = [1._dp, 2._dp, 3._dp]
v2 = [7._dp, 8._dp, 9._dp, 5._dp]
vv = [v1, v2]
print *,vv
end program main
$ gfortran -O -Wall a.f90
a.f90:7:0:
7 | vv = [v1, v2]
|
Warning: 'vv.offset' is used uninitialized in this function [-Wuninitialized]
a.f90:7:0: Warning: 'vv.dim[0].lbound' is used uninitialized in this function
[-Wuninitialized]
a.f90:7:0: Warning: 'vv.dim[0].ubound' is used uninitialized in this function
[-Wuninitialized]
$ /usr/bin/gfortran-8 -O -Wall a.f90
a.f90:7:0:
vv = [v1, v2]
Warning: 'vv.offset' is used uninitialized in this function [-Wuninitialized]
a.f90:7:0: Warning: 'vv.dim[0].lbound' is used uninitialized in this function
[-Wuninitialized]
a.f90:7:0: Warning: 'vv.dim[0].ubound' is used uninitialized in this function
[-Wuninitialized]
$ /usr/bin/gfortran-7 -O -Wall a.f90
a.f90:7:0:
vv = [v1, v2]
Warning: 'vv.offset' is used uninitialized in this function [-Wuninitialized]
a.f90:7:0: Warning: 'vv.dim[0].lbound' is used uninitialized in this function
[-Wuninitialized]
a.f90:7:0: Warning: 'vv.dim[0].ubound' is used uninitialized in this function
[-Wuninitialized]
$ /usr/bin/gfortran-6 -O -Wall a.f90
$
The warning is spurious, but there may be something wrong with the
generated code - let's see.
