Function try_check_compiler

configure.py:1326–1354

(cc, lang)

def try_check_compiler(cc, lang):
  try:
    proc = subprocess.Popen(shlex.split(cc) + ['-E', '-P', '-x', lang, '-'],
                            stdin=subprocess.PIPE, stdout=subprocess.PIPE)
  except OSError:
    return (False, False, '', '', False)

  with proc:
    proc.stdin.write(b'__clang__ __GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__ '
                     b'__clang_major__ __clang_minor__ __clang_patchlevel__ '
                     b'__APPLE__')

    cc_out = proc.communicate()
    cc_stdout = to_utf8(cc_out[0])
    if sys.platform == 'zos':
      values = (cc_stdout.split('\n')[-2].split() + ['0'] * 7)[0:8]
    else:
      values = (cc_stdout.split() + ['0'] * 7)[0:8]

  if len(values) < 8:
    cc_stderr = to_utf8(cc_out[1]) if cc_out[1] else ''
    raise Exception(f'Could not determine compiler version info. \nstdout:\n{cc_stdout}\nstderr:\n{cc_stderr}')

  is_clang = values[0] == '1'
  gcc_version = tuple(map(int, values[1:1+3]))
  clang_version = tuple(map(int, values[4:4+3])) if is_clang else None
  is_apple = values[7] == '1'

  return (True, is_clang, clang_version, gcc_version, is_apple)


#