error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
--- a/bfd.orig/elf64-ppc.c	2010-07-01 04:48:26.000000000 -0500
+++ b/bfd/elf64-ppc.c	2019-08-23 03:05:25.000000000 -0500
@@ -4609,7 +4609,7 @@
   len = strlen (name);
   dot_name = bfd_alloc (abfd, len + 2);
   if (dot_name == NULL)
-    return (struct elf_link_hash_entry *) 0 - 1;
+    return (struct elf_link_hash_entry *)-1L;
   dot_name[0] = '.';
   memcpy (dot_name + 1, name, len + 1);
   h = _bfd_elf_archive_symbol_lookup (abfd, info, dot_name);
--- a/bfd.orig/elflink.c	2010-04-14 03:29:33.000000000 -0500
+++ b/bfd/elflink.c	2019-08-23 03:04:48.000000000 -0500
@@ -4916,7 +4916,7 @@
   len = strlen (name);
   copy = (char *) bfd_alloc (abfd, len);
   if (copy == NULL)
-    return (struct elf_link_hash_entry *) 0 - 1;
+    return (struct elf_link_hash_entry *)-1L;
 
   first = p - name + 1;
   memcpy (copy, name, first);
@@ -5028,7 +5028,7 @@
 	    }
 
 	  h = archive_symbol_lookup (abfd, info, symdef->name);
-	  if (h == (struct elf_link_hash_entry *) 0 - 1)
+	  if (h == (struct elf_link_hash_entry *)-1L)
 	    goto error_return;
 
 	  if (h == NULL)