On Mon, Jun 06, 2011 at 03:41:14PM -0700, Roland McGrath wrote:
> Consider:
>
> % head ref.s def.s
> ==> ref.s <==
> .data
> ptrsym:
> .long badsym
>
> .section .gnu.warning.badsym,"",@progbits
> .string "badsym warning"
>
> ==> def.s <==
> .comm badsym,4
> % as --32 -o ref.o ref.s
> % as --32 -o def.o def.s
> % ar cqs def.a def.o
> % ./ld/ld-new -m elf_i386 -o foo ref.o def.a
> ref.o: In function `ptrsym':
> (.data+0x0): warning: badsym warning
> ./ld/ld-new: warning: cannot find entry symbol _start; defaulting to
> 0000000008048054
> ref.o: In function `ptrsym':
> (.data+0x0): undefined reference to `badsym'
> [Exit 1]
> %
I think you've managed to hit two bugs. I'll commit the following
after some testing.
bfd/
* elflink.c (_bfd_elf_archive_symbol_lookup): Follow warning and
indirect links here.
ld/
* ldlang.c (lang_one_common): Handle warning symbols.
Index: bfd/elflink.c
===================================================================
RCS file: /cvs/src/src/bfd/elflink.c,v
retrieving revision 1.406
diff -u -p -r1.406 elflink.c
--- bfd/elflink.c 26 May 2011 04:28:20 -0000 1.406
+++ bfd/elflink.c 7 Jun 2011 09:03:39 -0000
@@ -4911,7 +4911,7 @@ _bfd_elf_archive_symbol_lookup (bfd *abf
char *p, *copy;
size_t len, first;
- h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
+ h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
if (h != NULL)
return h;
@@ -4934,14 +4934,14 @@ _bfd_elf_archive_symbol_lookup (bfd *abf
memcpy (copy, name, first);
memcpy (copy + first, name + first + 1, len - first);
- h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, FALSE);
+ h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
if (h == NULL)
{
/* We also need to check references to the symbol without the
version. */
copy[first - 1] = '\0';
h = elf_link_hash_lookup (elf_hash_table (info), copy,
- FALSE, FALSE, FALSE);
+ FALSE, FALSE, TRUE);
}
bfd_release (abfd, copy);
Index: ld/ldlang.c
===================================================================
RCS file: /cvs/src/src/ld/ldlang.c,v
retrieving revision 1.370
diff -u -p -r1.370 ldlang.c
--- ld/ldlang.c 23 May 2011 05:41:01 -0000 1.370
+++ ld/ldlang.c 7 Jun 2011 09:03:41 -0000
@@ -5885,6 +5885,9 @@ lang_one_common (struct bfd_link_hash_en
bfd_vma size;
asection *section;
+ if (h->type == bfd_link_hash_warning)
+ h = h->u.i.link;
+
if (h->type != bfd_link_hash_common)
return TRUE;
--
Alan Modra
Australia Development Lab, IBM
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