https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106945

anlauf at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |anlauf at gcc dot 
gnu.org

--- Comment #5 from anlauf at gcc dot gnu.org ---
The issue appears to be a missing conversion:

diff --git a/gcc/fortran/trans-expr.cc b/gcc/fortran/trans-expr.cc
index 045c8b00b90..dcd39f46776 100644
--- a/gcc/fortran/trans-expr.cc
+++ b/gcc/fortran/trans-expr.cc
@@ -1531,6 +1531,7 @@ gfc_copy_class_to_class (tree from, tree to, tree nelems,
bool unlimited)
            name = (const char *)(DECL_NAME (to)->identifier.id.str);

          from_len = gfc_conv_descriptor_size (from_data, 1);
+         from_len = fold_convert (TREE_TYPE (orig_nelems), from_len);
          tmp = fold_build2_loc (input_location, NE_EXPR,
                                  logical_type_node, from_len, orig_nelems);
          msg = xasprintf ("Array bound mismatch for dimension %d "

While orig_nelems may come in as size_type_node (i.e. unsigned) from two
callsites, gfc_conv_descriptor_size returns gfc_array_index_type (signed).
As the actual size cannot be negative, it should be safe to convert it to
the type of orig_nelems.

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