def GetVersion()

in build/compiler_version.py [0:0]

• 35 lines of code
• 11 McCabe index (conditional complexity)

def GetVersion(compiler, tool):
  tool_output = tool_error = None
  cache_key = (compiler, tool)
  cached_version = compiler_version_cache.get(cache_key)
  if cached_version:
    return cached_version
  try:
    # Note that compiler could be something tricky like "distcc g++".
    if tool == "compiler":
      compiler = compiler + " -dumpversion"
      # 4.6
      version_re = re.compile(r"(\d+)\.(\d+)")
    elif tool == "assembler":
      compiler = compiler + " -Xassembler --version -x assembler -c /dev/null"
      # Unmodified: GNU assembler (GNU Binutils) 2.24
      # Ubuntu: GNU assembler (GNU Binutils for Ubuntu) 2.22
      # Fedora: GNU assembler version 2.23.2
      version_re = re.compile(r"^GNU [^ ]+ .* (\d+).(\d+).*?$", re.M)
    elif tool == "linker":
      compiler = compiler + " -Xlinker --version"
      # Using BFD linker
      # Unmodified: GNU ld (GNU Binutils) 2.24
      # Ubuntu: GNU ld (GNU Binutils for Ubuntu) 2.22
      # Fedora: GNU ld version 2.23.2
      # Using Gold linker
      # Unmodified: GNU gold (GNU Binutils 2.24) 1.11
      # Ubuntu: GNU gold (GNU Binutils for Ubuntu 2.22) 1.11
      # Fedora: GNU gold (version 2.23.2) 1.11
      version_re = re.compile(r"^GNU [^ ]+ .* (\d+).(\d+).*?$", re.M)
    else:
      raise Exception("Unknown tool %s" % tool)

    # Force the locale to C otherwise the version string could be localized
    # making regex matching fail.
    env = os.environ.copy()
    env["LC_ALL"] = "C"
    pipe = subprocess.Popen(compiler, shell=True, env=env,
                            stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    tool_output, tool_error = pipe.communicate()
    if pipe.returncode:
      raise subprocess.CalledProcessError(pipe.returncode, compiler)

    parsed_output = version_re.match(tool_output)
    result = parsed_output.group(1) + parsed_output.group(2)
    compiler_version_cache[cache_key] = result
    return result
  except Exception as e:
    if tool_error:
      sys.stderr.write(tool_error)
    print("compiler_version.py failed to execute:", compiler, file=sys.stderr)
    print(e, file=sys.stderr)
    return ""