PNaCl: Test support for GCC/LLVM vector extensions

tests/simd/nacl.scons

 # -*- python -*-
 # Copyright (c) 2014 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')
 
 def AddTest(env, src, exit_status='0', golden_file=None, test_suffix='',
             is_broken=False, compile_env=None, link_env=None,
             EXTRA_LIBS=[]):
   name = src.split('.')[0] + test_suffix
 
   compile_env = compile_env or env
   link_env = link_env or env
 
   obj = compile_env.ComponentObject(name, src)
   nexe = link_env.ComponentProgram(
       name, obj, EXTRA_LIBS=['${NONIRT_LIBS}'] + EXTRA_LIBS)
   node = env.CommandSelLdrTestNacl(
       name + '.out', nexe, exit_status=exit_status,
       stdout_golden=golden_file)
   env.AddNodeToTestSuite(
       node, ['toolchain_tests', 'small_tests'], 'run_' + name + '_test',
       is_broken=is_broken)
 
+c_flags = ['-std=gnu99']
 cxx_flags = (['-Wc++11-narrowing', '-std=gnu++11']
              if env.Bit('bitcode') else ['-std=gnu++0x'])
 
 native_env = env.Clone()
 if env.Bit('bitcode'):
   native_flags = []
 elif env.Bit('target_x86_32'):
   native_flags = ['-msse2', '-msse3', '-msse4']
 elif env.Bit('target_x86_64'):
   native_flags = ['-msse2', '-msse3', '-msse4']
 elif env.Bit('target_arm'):
   native_flags = ['--target=armv7a-unknown-nacl-gnueabi','-mfloat-abi=hard']
 elif env.Bit('target_mips32'):
   native_flags = []
-native_env.Append(CCFLAGS=native_flags + cxx_flags)
+native_env.Append(CFLAGS=c_flags)
+native_env.Append(CXXFLAGS=cxx_flags)
+native_env.Append(CCFLAGS=native_flags)
 
 ref_env = env.Clone()
 ref_flags = ['-DVREFIMPL']
-ref_env.Append(CCFLAGS=ref_flags + cxx_flags)
+ref_env.Append(CFLAGS=c_flags)
+ref_env.Append(CXXFLAGS=cxx_flags)
+ref_env.Append(CCFLAGS=ref_flags)
 
 # TODO(jfb): The native environment currently doesn't compile.
 if env.Bit('bitcode'):
   AddTest(native_env, 'simd.cc', test_suffix='_native')
 AddTest(ref_env, 'simd.cc', test_suffix='_ref')
+
+# GCC 4.4 doesn't support all features of the vector extensions in C.
+# TODO(jfb) Re-enable testing when we migrate to a newer GCC.
+if env.Bit('bitcode'):
+  AddTest(ref_env, 'vector_extension.c',
+          golden_file=ref_env.File('vector_extension.stdout'))