lto-elf.c (lto_obj_file_open): Also provide filename when elf_begin fails.

	* lto-elf.c (lto_obj_file_open): Also provide filename when
	elf_begin fails.

From-SVN: r164394

gcc/lto/ChangeLog

+2010-09-18  Gerald Pfeifer  <gerald@pfeifer.com>
+
+	* lto-elf.c (lto_obj_file_open): Also provide filename when
+	elf_begin fails.
+
 2010-09-17  Jan Hubicka  <jh@suse.cz>
 
 	* lto.c (lto_promote_cross_file_statics): Use const_value_known.

gcc/lto/lto-elf.c

@@ -674,7 +674,7 @@ lto_obj_file_open (const char *filename, bool writable)
 			     NULL);
   if (!elf_file->elf)
     {
-      error ("could not open ELF file: %s", elf_errmsg (0));
+      error ("could not open %s as an ELF file: %s", fname, elf_errmsg (0));
       goto fail;
     }