Fortran: skip compile-time shape check if constructor shape is not known

gcc/fortran/ChangeLog:

	PR fortran/104619
	* resolve.cc (resolve_structure_cons): Skip shape check if shape
	of constructor cannot be determined at compile time.

gcc/testsuite/ChangeLog:

	PR fortran/104619
	* gfortran.dg/derived_constructor_comps_7.f90: New test.

gcc/fortran/resolve.cc

@@ -1472,6 +1472,8 @@ resolve_structure_cons (gfc_expr *expr, int init)
 		  t = false;
 		  break;
 		};
+	      if (cons->expr->shape == NULL)
+		continue;
 	      mpz_set_ui (len, 1);
 	      mpz_add (len, len, comp->as->upper[n]->value.integer);
 	      mpz_sub (len, len, comp->as->lower[n]->value.integer);

gcc/testsuite/gfortran.dg/derived_constructor_comps_7.f90

@@ -0,0 +1,28 @@
+! { dg-do run }
+! PR fortran/104619
+
+module m
+  implicit none
+  type :: item
+     real :: x
+  end type item
+  type :: container
+     type(item) :: items(3)
+  end type container
+end module
+
+program p
+  use m
+  implicit none
+  type(item), allocatable :: items(:)
+  type(container) :: c
+  integer         :: i, n
+  items = [item(3.0), item(4.0), item(5.0)]
+  c = container(items=[(items(i), i = 1, size(items))])
+  if (any (c%items% x /= items% x)) stop 1
+  n = size (items)
+  c = container(items=[(items(i), i = 1, n)])
+  if (any (c%items% x /= items% x)) stop 2
+  c = container(items=[(items(i), i = 1, 3)])
+  if (any (c%items% x /= items% x)) stop 3
+end program