Fortran: fix passing array component ref to polymorphic procedures

	PR fortran/105658

gcc/fortran/ChangeLog:

	* trans-expr.cc (gfc_conv_intrinsic_to_class): When passing an
	array component reference of intrinsic type to a procedure
	with an unlimited polymorphic dummy argument, a temporary
	should be created.

gcc/testsuite/ChangeLog:

	* gfortran.dg/PR105658.f90: New test.

Signed-off-by: Peter Hill <peter.hill@york.ac.uk>

1 files changed, 50 insertions, 0 deletions

diff --git a/gcc/testsuite/gfortran.dg/PR105658.f90 b/gcc/testsuite/gfortran.dg/PR105658.f90
new file mode 100644
index 0000000..8aacecf
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/PR105658.f90
@@ -0,0 +1,50 @@
+! { dg-do compile }
+! { dg-options "-Warray-temporaries" }
+! Test fix for incorrectly passing array component to unlimited polymorphic procedure
+
+module test_PR105658_mod
+   implicit none
+   type :: foo
+     integer :: member1
+     integer :: member2
+   end type foo
+contains
+   subroutine print_poly(array)
+     class(*), dimension(:), intent(in) :: array
+     select type(array)
+     type is (integer)
+       print*, array
+     type is (character(*))
+       print *, array
+     end select
+   end subroutine print_poly
+
+   subroutine do_print(thing)
+     type(foo), dimension(3), intent(in) :: thing
+     type(foo), parameter :: y(3) = [foo(1,2),foo(3,4),foo(5,6)]
+     integer :: i, j, uu(5,6)
+
+     call print_poly(thing%member1)   ! { dg-warning "array temporary" }
+     call print_poly(y%member2)       ! { dg-warning "array temporary" }
+     call print_poly(y(1::2)%member2) ! { dg-warning "array temporary" }
+
+     ! The following array sections work without temporaries
+     uu = reshape([(((10*i+j),i=1,5),j=1,6)],[5,6])
+     print *, uu(2,2::2)
+     call print_poly (uu(2,2::2))     ! no temp needed!
+     print *, uu(1::2,6)
+     call print_poly (uu(1::2,6))     ! no temp needed!
+   end subroutine do_print
+
+   subroutine do_print2(thing2)
+     class(foo), dimension(:), intent(in) :: thing2
+     call print_poly (thing2% member2) ! { dg-warning "array temporary" }
+   end subroutine do_print2
+
+   subroutine do_print3 ()
+     character(3) :: c(3) = ["abc","def","ghi"]
+     call print_poly (c(1::2))      ! no temp needed!
+     call print_poly (c(1::2)(2:3)) ! { dg-warning "array temporary" }
+   end subroutine do_print3
+
+end module test_PR105658_mod