[PATCH] Improve on PR81968

[Richard Biener]

The following avoids invalid flag combinations on removed sections
and fixes a word-size bug I noticed when doing so.

LTO bootstrap / testing in progress on x86_64-unknown-linux-gnu.

Richard.

2017-08-28  Richard Biener  <rguent...@suse.de>

        PR lto/81968
        * simple-object-elf.c (simple_object_elf_copy_lto_debug_section):
        Adjust field with for sh_type write, set SHF_EXCLUDE only for
        removed sections.

Index: libiberty/simple-object-elf.c
===================================================================
--- libiberty/simple-object-elf.c       (revision 251377)
+++ libiberty/simple-object-elf.c       (working copy)
@@ -1382,7 +1382,7 @@ simple_object_elf_copy_lto_debug_section
             unused.  That allows the link editor to remove it in a partial
             link.  */
          ELF_SET_FIELD (type_functions, ei_class, Shdr,
-                        shdr, sh_type, Elf_Addr, SHT_NULL);
+                        shdr, sh_type, Elf_Word, SHT_NULL);
        }
 
       flags = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
@@ -1390,7 +1390,7 @@ simple_object_elf_copy_lto_debug_section
       if (ret == 0)
        flags &= ~SHF_EXCLUDE;
       else if (ret == -1)
-       flags |= SHF_EXCLUDE;
+       flags = SHF_EXCLUDE;
       ELF_SET_FIELD (type_functions, ei_class, Shdr,
                     shdr, sh_flags, Elf_Addr, flags);
     }