gdb/

* symfile.c (addr_section_name): New function.
	(addrs_section_compar): Use it.
	(addr_info_make_relative): Use it.  Move variable sect_name into a more
	inner block.  Make ".dynbss" and ".sdynbss" checks more strict.

gdb/testsuite/
	* gdb.base/prelink-lib.c (copyreloc): New initialized variable.
	* gdb.base/prelink.c (copyreloc, bssvar, bssvarp): New variables.
	(main): Use copyreloc.
	* gdb.base/prelink.exp (split debug of executable)
	(.dynbss vs. .bss address shift): New tests.

gdb/testsuite/gdb.base/prelink-lib.c

@@ -16,6 +16,8 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+int copyreloc = 1;
+
 int
 g (void (*p)(void))
 {