text: # -*- Python -*-
  
  import os
  
  def get_required_attr(config, attr_name):
    attr_value = getattr(config, attr_name, None)
    if attr_value == None:
      lit_config.fatal(
        "No attribute %r in test configuration! You may need to run "
        "tests from your build directory or add this attribute "
        "to lit.site.cfg.py " % attr_name)
    return attr_value
  
  # Setup config name.
  config.name = 'Profile-' + config.target_arch
  
  # Setup source root.
  config.test_source_root = os.path.dirname(__file__)
  
  # Setup executable root.
  if hasattr(config, 'profile_lit_binary_dir') and \
          config.profile_lit_binary_dir is not None:
      config.test_exec_root = os.path.join(config.profile_lit_binary_dir, config.name)
  
  if config.host_os in ['Linux']:
    extra_link_flags = ["-ldl"]
  elif config.host_os in ['Windows']:
    # InstrProf is incompatible with incremental linking. Disable it as a
    # workaround.
    extra_link_flags = ["-Wl,-incremental:no"]
  else:
    extra_link_flags = []
  
  # Test suffixes.
  config.suffixes = ['.c', '.cpp', '.m', '.mm', '.ll', '.test']
  
  # What to exclude.
  config.excludes = ['Inputs']
  
  # Clang flags.
  target_cflags=[get_required_attr(config, "target_cflags")]
  clang_cflags = target_cflags + extra_link_flags
  clang_cxxflags = config.cxx_mode_flags + clang_cflags
  
  def build_invocation(compile_flags, with_lto = False):
    lto_flags = []
    lto_prefix = []
    if with_lto and config.lto_supported:
      lto_flags += config.lto_flags
      lto_prefix += config.lto_launch
    return " " + " ".join(lto_prefix + [config.clang] + lto_flags + compile_flags) + " "
  
  def exclude_unsupported_files_for_aix(dirname):
     for filename in os.listdir(dirname):
         source_path = os.path.join( dirname, filename)
         if os.path.isdir(source_path):
             continue
         f = open(source_path, 'r')
         try:
            data = f.read()
            # -fprofile-instr-generate and rpath are not supported on AIX, exclude all tests with them.
            if ("%clang_profgen" in data or "%clangxx_profgen" in data or "-rpath" in data):
              config.excludes += [ filename ]
         finally:
            f.close()
  
  # Add clang substitutions.
  config.substitutions.append( ("%clang ", build_invocation(clang_cflags)) )
  config.substitutions.append( ("%clangxx ", build_invocation(clang_cxxflags)) )
  config.substitutions.append( ("%clang_profgen ", build_invocation(clang_cflags) + " -fprofile-instr-generate ") )
  config.substitutions.append( ("%clang_profgen=", build_invocation(clang_cflags) + " -fprofile-instr-generate=") )
  config.substitutions.append( ("%clang_pgogen ", build_invocation(clang_cflags) + " -fprofile-generate ") )
  config.substitutions.append( ("%clang_pgogen=", build_invocation(clang_cflags) + " -fprofile-generate=") )
  
  config.substitutions.append( ("%clangxx_profgen ", build_invocation(clang_cxxflags) + " -fprofile-instr-generate ") )
  config.substitutions.append( ("%clangxx_profgen=", build_invocation(clang_cxxflags) + " -fprofile-instr-generate=") )
  config.substitutions.append( ("%clangxx_pgogen ", build_invocation(clang_cxxflags) + " -fprofile-generate ") )
  config.substitutions.append( ("%clangxx_pgogen=", build_invocation(clang_cxxflags) + " -fprofile-generate=") )
  
  config.substitutions.append( ("%clang_profgen_gcc=", build_invocation(clang_cflags) + " -fprofile-generate=") )
  config.substitutions.append( ("%clang_profuse_gcc=", build_invocation(clang_cflags) + " -fprofile-use=") )
  
  config.substitutions.append( ("%clang_profuse=", build_invocation(clang_cflags) + " -fprofile-instr-use=") )
  config.substitutions.append( ("%clangxx_profuse=", build_invocation(clang_cxxflags) + " -fprofile-instr-use=") )
  
  config.substitutions.append( ("%clang_lto_profgen=", build_invocation(clang_cflags, True) + " -fprofile-instr-generate=") )
  
  if config.host_os not in ['Windows', 'Darwin', 'FreeBSD', 'Linux', 'NetBSD', 'SunOS', 'AIX']:
    config.unsupported = True
  
  if config.host_os in ['AIX']:
    config.available_features.add('system-aix')
    exclude_unsupported_files_for_aix(config.test_source_root)
    exclude_unsupported_files_for_aix(config.test_source_root + "/Posix")
  
  if config.target_arch in ['armv7l']:
    config.unsupported = True
  
  if config.android:
    config.unsupported = True
  