[MIPS] Support for building tests for MIPS

tests/gdb/nacl.scons

 # -*- python -*-
 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 Import('env')
 
 if 'TRUSTED_ENV' not in env:
   Return()
 
-if env.Bit('target_arm'):
+if env.Bit('target_arm') or env.Bit('target_mips32'):
   if env.UsingEmulator():
-    # These tests do not work under qemu-arm.
+    # These tests do not work under qemu.
     Return()
-  # Use the system's ARM GDB because the NaCl toolchain does not
-  # include a copy of GDB built to run on ARM.
+  # Use the system's ARM/MIPS GDB because the NaCl toolchain does not
+  # include a copy of GDB built to run on ARM/MIPS.
   env.Replace(GDB='gdb')
   # Unlike nacl-gdb, the system version of GDB does not support the
   # "nacl-irt" command.
   if env.Bit('tests_use_irt'):
     Return()
 
 # We need -O0 to make stepping predictable and read local variables/function
 # arguments that may otherwise be optimized out.
 env.Append(CCFLAGS=['-O0', '-g', '-fno-omit-frame-pointer'])
 # We need to disable PNaCl's link time optimizations so that functions
@@ skipping 61 matching lines @@
     extra_deps=extra_deps,
     command=['${PYTHON}', env.File('stack_trace.py'),
              '--nexe', gdb_test_guest] + test_args)
 
 # This fails on ARM+PNaCl because it gets an
 # unexpected value for a function argument from
 # the stack backtrace.
 # TODO(mseaborn): Investigate and enable this test.
 # http://code.google.com/p/nativeclient/issues/detail?id=3252
 env.AddNodeToTestSuite(node, test_suites, 'run_gdb_stack_trace_test',
-                       is_broken=env.Bit('bitcode') and env.Bit('target_arm'))
+                       is_broken=env.Bit('bitcode'))
 env.TestBindsFixedTcpPort(node)
 
 node = env.CommandTest(
     'gdb_step_from_func_start.out',
     extra_deps=extra_deps,
     command=['${PYTHON}', env.File('step_from_func_start.py'),
              '--nexe', gdb_test_guest] + test_args)
 
 env.AddNodeToTestSuite(node, test_suites, 'run_gdb_step_from_func_start_test')
 env.TestBindsFixedTcpPort(node)
@@ skipping 11 matching lines @@
     'gdb_change_variable.out',
     extra_deps=extra_deps,
     command=['${PYTHON}', env.File('change_variable.py'),
              '--nexe', gdb_test_guest] + test_args)
 
 # This fails on ARM+PNaCl because it is reading
 # local_var before it has been initialised.
 # TODO(mseaborn): Investigate and enable this test.
 # http://code.google.com/p/nativeclient/issues/detail?id=3252
 env.AddNodeToTestSuite(node, test_suites, 'run_gdb_change_variable_test',
-                       is_broken=env.Bit('bitcode') and env.Bit('target_arm'))
+                       is_broken=env.Bit('bitcode'))
 env.TestBindsFixedTcpPort(node)
 
 if not env.Bit('nacl_static_link'):
   node = env.CommandTest(
       'gdb_execute_nacl_manifest_twice.out',
       extra_deps=extra_deps,
       command=['${PYTHON}', env.File('execute_nacl_manifest_twice.py'),
                '--nexe', gdb_test_guest] + test_args)
 
   env.AddNodeToTestSuite(node, test_suites,
@@ skipping 18 matching lines @@
 env.TestBindsFixedTcpPort(node)
 
 node = env.CommandTest(
     'gdb_syscall_thread.out',
     extra_deps=extra_deps,
     command=['${PYTHON}', env.File('syscall_thread.py'),
              '--nexe', gdb_test_guest_thread] + test_args)
 
 env.AddNodeToTestSuite(node, test_suites, 'run_gdb_syscall_thread_test')
 env.TestBindsFixedTcpPort(node)