Add a scons pnacl finalize step for pnacl_generate_pexe tests.

tests/barebones/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')
 
 # Use of "-nostdlib" means these tests produce statically-linked
 # executables.  This does not work with the test runner for
 # nacl-glibc, which always runs the executables via ld.so.  However,
 # we want to keep building the tests.
 # TODO(mseaborn): To fix this, either switch these tests to
 # dynamically link against libc, or make use of ld.so optional.
 is_glibc = env.Bit('nacl_glibc')
 
 env.Replace(LIBS=[],
             EXTRA_LIBS=[],
             LINKFLAGS=['-nostdlib'],
             TRANSLATEFLAGS=['-nostdlib'])
 
 # This setting will affect the barebones_regs.c test
 if env.Bit('build_arm'):
   env.Append(CPPDEFINES='SMALL_REGS_TEST')
 
+# The barebones_reloc test need symbols preserved, since it provides
+# a stub function for something that normally comes from the system libraries.
+# TODO(jvoung): That can be fixed by removing -nostdlib from TRANSLATEFLAGS.
+# Then the translator will get the required functions from system libs.
+# However, removing -nostdlib from TRANSLATEFLAGS will break due to:
+# https://code.google.com/p/nativeclient/issues/detail?id=3069
+if env.Bit('bitcode'):
+  env.SetBits('nonstable_bitcode')
+if env.Bit('skip_nonstable_bitcode'):
+  Return()
 
 # NOTE: the x86 linker wants _start() to be the very first function
 FAKE_STARTUP = env.ComponentObject('fake_startup', 'fake_startup.c')
 
 barebones_tests = ['addr_modes',
                    'stack_alignment16',
                    'exit',
                    'fib',
                    'hello_world',
                    'negindex',
@@ skipping 38 matching lines @@
   if native_env.Bit('bitcode'):
     native_env.AddBiasForPNaCl()
     native_env.PNaClForceNative()
 
     nexe = native_env.ComponentProgram('top_of_sandbox', ['top_of_sandbox.c'])
     node = native_env.CommandSelLdrTestNacl('top_of_sandbox.out', nexe)
     native_env.AddNodeToTestSuite(
         node, ['small_tests', 'sel_ldr_tests', 'barebones_tests'],
         'run_top_of_sandbox_test',
         is_broken=is_glibc)