https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109171
anlauf at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2023-03-17
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Keywords| |wrong-code
--- Comment #2 from anlauf at gcc dot gnu.org ---
Confirmed. I also have the gut feeling that there is a duplicate.
It appears that we do not initialize the pointer. Consider:
program boom
use, intrinsic :: iso_c_binding, only: c_loc
implicit none
complex, save, target :: a(4) = [(1.,0.), (2.,0.), (3.,0.), (4.,0.)]
real, pointer :: p(:) => a(1:3:2)%re
real, pointer :: q(:)
q => a(1:3:2)%re
print *, "size (p) =", size (p)
print *, "size (q) =", size (q)
print *, "c_loc(p(1)), c_loc(p(2)) =", c_loc(p(1)), c_loc(p(2))
print *, "c_loc(q(1)), c_loc(q(2)) =", c_loc(q(1)), c_loc(q(2))
! print *, p ! this segfaults
print *, q
end program boom
This prints e.g.
size (p) = 1
size (q) = 2
c_loc(p(1)), c_loc(p(2)) = 0 0
c_loc(q(1)), c_loc(q(2)) = 4202592 4202608
1.00000000 3.00000000
Crayftn 14.0 (the only compiler that I found to work here):
size (p) = 2
size (q) = 2
c_loc(p(1)), c_loc(p(2)) = 4210816, 4210832
c_loc(q(1)), c_loc(q(2)) = 4210816, 4210832
1., 3.
