[MIPS] Support for building tests for MIPS

tests/callingconv_case_by_case/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')
 
 # This test does not make any sense for pure pnacl
 if env.Bit('bitcode') and env.Bit('pnacl_generate_pexe'):
   Return()
 
+# This test is disabled for MIPS because we do not have a MIPS-enabled nacl-gcc
+# to test PNaCl against.
+if env.Bit('target_mips32'):
+  Return()
+
 # Case-by-case calling Convention Test for PNaCl and nacl-gcc compatibility.
 
 # We make 4 modules.
 # CC1 emits MODULE0 and CC2 MODULE1, CC2 emits MODULE2 and CC1 MODULE3
 # For the call test:
 # MODULE0(cc1) -> MODULE0(cc1) -> MODULE1(cc2) -> MODULE2(cc2) -> MODULE3(cc1).
 # For the return test, the dataflow is reversed.
 
 # For x86-64, there is a compatibility flag and calling conv attribute.
 # We use the same framework to test those as well.
@@ skipping 110 matching lines @@
                               test_source)
       objfiles.append(obj)
     prog = link_env.ComponentProgram(test_full_name,
                                      objfiles,
                                      EXTRA_LIBS=['${NONIRT_LIBS}'])
     node = env.CommandSelLdrTestNacl(test_full_name + '.out',
                                      prog)
     env.AddNodeToTestSuite(node, ['small_tests', 'toolchain_tests',
                                   'nonpexe_tests'],
                            'run_' + test_full_name + '_test')