Description:
When attempting to dump information on the MPX bound registers, gdb throws a python exception, as long is not defined.

The issue occurs because gdb was compiled with Python 3 support. However, long and int were merged in Python 3 and long removed. The file at fault is:

printer/bound_registers.py

By changing the line

size = (long) ((upper) - (lower))

to

size = (int) ((upper) - (lower))

the problem is resolved.

Additional info:
* gdb-common 7.12-4
* gdb 7.12

Steps to reproduce:
** In order to reproduce this bug, an MPX-enabled processor is needed **
1) run gdb
$ gdb ./myprogram.elf

2) set a breakpoint anywere
(gdb) break main

3) run the program
(gdb) run

4) dump register information for a bounds register, error occurs
(gdb) info reg bnd0
Python Exception <class 'NameError'> name 'long' is not defined:
Python Exception <class 'NameError'> name 'long' is not defined:
bnd0

4') should see information on register, example:
(gdb) info reg bnd0
bnd0 {lbound = 0x0, ubound = 0xffffffffffffffff} : size = -1 {lbound = 0x0, ubound = 0xffffffffffffffff} : size = -1


Thank you. Cheers,
Orlando.