text: #!/usr/bin/env python3
  
  # Copyright 2012-2016 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from typing import List, Tuple
  import itertools
  import os
  import subprocess
  import shutil
  import sys
  import signal
  from io import StringIO
  from ast import literal_eval
  from enum import Enum
  import tempfile
  from pathlib import Path, PurePath
  from mesonbuild import build
  from mesonbuild import environment
  from mesonbuild import compilers
  from mesonbuild import mesonlib
  from mesonbuild import mlog
  from mesonbuild import mtest
  from mesonbuild.mesonlib import MachineChoice, stringlistify, Popen_safe
  from mesonbuild.coredata import backendlist
  import argparse
  import xml.etree.ElementTree as ET
  import time
  import multiprocessing
  from concurrent.futures import ProcessPoolExecutor, CancelledError
  import re
  from run_tests import get_fake_options, run_configure, get_meson_script
  from run_tests import get_backend_commands, get_backend_args_for_dir, Backend
  from run_tests import ensure_backend_detects_changes
  from run_tests import guess_backend
  
  
  class BuildStep(Enum):
      configure = 1
      build = 2
      test = 3
      install = 4
      clean = 5
      validate = 6
  
  
  class TestResult:
      def __init__(self, msg, step, stdo, stde, mlog, conftime=0, buildtime=0, testtime=0):
          self.msg = msg
          self.step = step
          self.stdo = stdo
          self.stde = stde
          self.mlog = mlog
          self.conftime = conftime
          self.buildtime = buildtime
          self.testtime = testtime
  
  
  class AutoDeletedDir:
      def __init__(self, d):
          self.dir = d
  
      def __enter__(self):
          os.makedirs(self.dir, exist_ok=True)
          return self.dir
  
      def __exit__(self, _type, value, traceback):
          # We don't use tempfile.TemporaryDirectory, but wrap the
          # deletion in the AutoDeletedDir class because
          # it fails on Windows due antivirus programs
          # holding files open.
          mesonlib.windows_proof_rmtree(self.dir)
  
  failing_logs = []
  print_debug = 'MESON_PRINT_TEST_OUTPUT' in os.environ
  under_ci = 'CI' in os.environ
  do_debug = under_ci or print_debug
  no_meson_log_msg = 'No meson-log.txt found.'
  
  system_compiler = None
  
  class StopException(Exception):
      def __init__(self):
          super().__init__('Stopped by user')
  
  stop = False
  def stop_handler(signal, frame):
      global stop
      stop = True
  signal.signal(signal.SIGINT, stop_handler)
  signal.signal(signal.SIGTERM, stop_handler)
  
  def setup_commands(optbackend):
      global do_debug, backend, backend_flags
      global compile_commands, clean_commands, test_commands, install_commands, uninstall_commands
      backend, backend_flags = guess_backend(optbackend, shutil.which('msbuild'))
      compile_commands, clean_commands, test_commands, install_commands, \
          uninstall_commands = get_backend_commands(backend, do_debug)
  
  def get_relative_files_list_from_dir(fromdir):
      paths = []
      for (root, _, files) in os.walk(fromdir):
          reldir = os.path.relpath(root, start=fromdir)
          for f in files:
              path = os.path.join(reldir, f).replace('\\', '/')
              if path.startswith('./'):
                  path = path[2:]
              paths.append(path)
      return paths
  
  def platform_fix_name(fname, compiler, env):
      # canonicalize compiler
      if compiler in {'clang-cl', 'intel-cl'}:
          canonical_compiler = 'msvc'
      else:
          canonical_compiler = compiler
  
      if '?lib' in fname:
          if env.machines.host.is_windows() and canonical_compiler == 'msvc':
              fname = re.sub(r'lib/\?lib(.*)\.', r'bin/\1.', fname)
              fname = re.sub(r'/\?lib/', r'/bin/', fname)
          elif env.machines.host.is_windows():
              fname = re.sub(r'lib/\?lib(.*)\.', r'bin/lib\1.', fname)
              fname = re.sub(r'\?lib(.*)\.dll$', r'lib\1.dll', fname)
              fname = re.sub(r'/\?lib/', r'/bin/', fname)
          elif env.machines.host.is_cygwin():
              fname = re.sub(r'lib/\?lib(.*)\.so$', r'bin/cyg\1.dll', fname)
              fname = re.sub(r'lib/\?lib(.*)\.', r'bin/cyg\1.', fname)
              fname = re.sub(r'\?lib(.*)\.dll$', r'cyg\1.dll', fname)
              fname = re.sub(r'/\?lib/', r'/bin/', fname)
          else:
              fname = re.sub(r'\?lib', 'lib', fname)
  
      if fname.endswith('?exe'):
          fname = fname[:-4]
          if env.machines.host.is_windows() or env.machines.host.is_cygwin():
              return fname + '.exe'
  
      if fname.startswith('?msvc:'):
          fname = fname[6:]
          if canonical_compiler != 'msvc':
              return None
  
      if fname.startswith('?gcc:'):
          fname = fname[5:]
          if canonical_compiler == 'msvc':
              return None
  
      if fname.startswith('?cygwin:'):
          fname = fname[8:]
          if not env.machines.host.is_cygwin():
              return None
  
      if fname.startswith('?!cygwin:'):
          fname = fname[9:]
          if env.machines.host.is_cygwin():
              return None
  
      if fname.endswith('?so'):
          if env.machines.host.is_windows() and canonical_compiler == 'msvc':
              fname = re.sub(r'lib/([^/]*)\?so$', r'bin/\1.dll', fname)
              fname = re.sub(r'/(?:lib|)([^/]*?)\?so$', r'/\1.dll', fname)
              return fname
          elif env.machines.host.is_windows():
              fname = re.sub(r'lib/([^/]*)\?so$', r'bin/\1.dll', fname)
              fname = re.sub(r'/([^/]*?)\?so$', r'/\1.dll', fname)
              return fname
          elif env.machines.host.is_cygwin():
              fname = re.sub(r'lib/([^/]*)\?so$', r'bin/\1.dll', fname)
              fname = re.sub(r'/lib([^/]*?)\?so$', r'/cyg\1.dll', fname)
              fname = re.sub(r'/([^/]*?)\?so$', r'/\1.dll', fname)
              return fname
          elif env.machines.host.is_darwin():
              return fname[:-3] + '.dylib'
          else:
              return fname[:-3] + '.so'
  
      if fname.endswith('?implib') or fname.endswith('?implibempty'):
          if env.machines.host.is_windows() and canonical_compiler == 'msvc':
              # only MSVC doesn't generate empty implibs
              if fname.endswith('?implibempty') and compiler == 'msvc':
                  return None
              return re.sub(r'/(?:lib|)([^/]*?)\?implib(?:empty|)$', r'/\1.lib', fname)
          elif env.machines.host.is_windows() or env.machines.host.is_cygwin():
              return re.sub(r'\?implib(?:empty|)$', r'.dll.a', fname)
          else:
              return None
  
      return fname
  
  def validate_install(srcdir, installdir, compiler, env):
      # List of installed files
      info_file = os.path.join(srcdir, 'installed_files.txt')
      # If this exists, the test does not install any other files
      noinst_file = 'usr/no-installed-files'
      expected = {}
      ret_msg = ''
      # Generate list of expected files
      if os.path.exists(os.path.join(installdir, noinst_file)):
          expected[noinst_file] = False
      elif os.path.exists(info_file):
          with open(info_file) as f:
              for line in f:
                  line = platform_fix_name(line.strip(), compiler, env)
                  if line:
                      expected[line] = False
      # Check if expected files were found
      for fname in expected:
          file_path = os.path.join(installdir, fname)
          if os.path.exists(file_path) or os.path.islink(file_path):
              expected[fname] = True
      for (fname, found) in expected.items():
          if not found:
              ret_msg += 'Expected file {0} missing.\n'.format(fname)
      # Check if there are any unexpected files
      found = get_relative_files_list_from_dir(installdir)
      for fname in found:
          if fname not in expected:
              ret_msg += 'Extra file {0} found.\n'.format(fname)
      if ret_msg != '':
          ret_msg += '\nInstall dir contents:\n'
          for i in found:
              ret_msg += '  - {}'.format(i)
      return ret_msg
  
  def log_text_file(logfile, testdir, stdo, stde):
      global stop, executor, futures
      logfile.write('%s\nstdout\n\n---\n' % testdir.as_posix())
      logfile.write(stdo)
      logfile.write('\n\n---\n\nstderr\n\n---\n')
      logfile.write(stde)
      logfile.write('\n\n---\n\n')
      if print_debug:
          try:
              print(stdo)
          except UnicodeError:
              sanitized_out = stdo.encode('ascii', errors='replace').decode()
              print(sanitized_out)
          try:
              print(stde, file=sys.stderr)
          except UnicodeError:
              sanitized_err = stde.encode('ascii', errors='replace').decode()
              print(sanitized_err, file=sys.stderr)
      if stop:
          print("Aborting..")
          for f in futures:
              f[2].cancel()
          executor.shutdown()
          raise StopException()
  
  
  def bold(text):
      return mlog.bold(text).get_text(mlog.colorize_console)
  
  
  def green(text):
      return mlog.green(text).get_text(mlog.colorize_console)
  
  
  def red(text):
      return mlog.red(text).get_text(mlog.colorize_console)
  
  
  def yellow(text):
      return mlog.yellow(text).get_text(mlog.colorize_console)
  
  
  def run_test_inprocess(testdir):
      old_stdout = sys.stdout
      sys.stdout = mystdout = StringIO()
      old_stderr = sys.stderr
      sys.stderr = mystderr = StringIO()
      old_cwd = os.getcwd()
      os.chdir(testdir)
      test_log_fname = Path('meson-logs', 'testlog.txt')
      try:
          returncode_test = mtest.run_with_args(['--no-rebuild'])
          if test_log_fname.exists():
              test_log = test_log_fname.open(errors='ignore').read()
          else:
              test_log = ''
          returncode_benchmark = mtest.run_with_args(['--no-rebuild', '--benchmark', '--logbase', 'benchmarklog'])
      finally:
          sys.stdout = old_stdout
          sys.stderr = old_stderr
          os.chdir(old_cwd)
      return max(returncode_test, returncode_benchmark), mystdout.getvalue(), mystderr.getvalue(), test_log
  
  def parse_test_args(testdir):
      args = []
      try:
          with open(os.path.join(testdir, 'test_args.txt'), 'r') as f:
              content = f.read()
              try:
                  args = literal_eval(content)
              except Exception:
                  raise Exception('Malformed test_args file.')
              args = stringlistify(args)
      except FileNotFoundError:
          pass
      return args
  
  # Build directory name must be the same so Ccache works over
  # consecutive invocations.
  def create_deterministic_builddir(src_dir):
      import hashlib
      rel_dirname = 'b ' + hashlib.sha256(src_dir.encode(errors='ignore')).hexdigest()[0:10]
      os.mkdir(rel_dirname)
      abs_pathname = os.path.join(os.getcwd(), rel_dirname)
      return abs_pathname
  
  def run_test(skipped, testdir, extra_args, compiler, backend, flags, commands, should_fail):
      if skipped:
          return None
      with AutoDeletedDir(create_deterministic_builddir(testdir)) as build_dir:
          with AutoDeletedDir(tempfile.mkdtemp(prefix='i ', dir=os.getcwd())) as install_dir:
              try:
                  return _run_test(testdir, build_dir, install_dir, extra_args, compiler, backend, flags, commands, should_fail)
              finally:
                  mlog.shutdown() # Close the log file because otherwise Windows wets itself.
  
  def pass_prefix_to_test(dirname):
      if '39 prefix absolute' in dirname:
          return False
      return True
  
  def pass_libdir_to_test(dirname):
      if '8 install' in dirname:
          return False
      if '38 libdir must be inside prefix' in dirname:
          return False
      if '196 install_mode' in dirname:
          return False
      return True
  
  def _run_test(testdir, test_build_dir, install_dir, extra_args, compiler, backend, flags, commands, should_fail):
      compile_commands, clean_commands, install_commands, uninstall_commands = commands
      test_args = parse_test_args(testdir)
      gen_start = time.time()
      # Configure in-process
      if pass_prefix_to_test(testdir):
          gen_args = ['--prefix', '/usr']
      else:
          gen_args = []
      if pass_libdir_to_test(testdir):
          gen_args += ['--libdir', 'lib']
      gen_args += [testdir, test_build_dir] + flags + test_args + extra_args
      nativefile = os.path.join(testdir, 'nativefile.ini')
      if os.path.exists(nativefile):
          gen_args.extend(['--native-file', nativefile])
      crossfile = os.path.join(testdir, 'crossfile.ini')
      if os.path.exists(crossfile):
          gen_args.extend(['--cross-file', crossfile])
      (returncode, stdo, stde) = run_configure(gen_args)
      try:
          logfile = Path(test_build_dir, 'meson-logs', 'meson-log.txt')
          mesonlog = logfile.open(errors='ignore', encoding='utf-8').read()
      except Exception:
          mesonlog = no_meson_log_msg
      gen_time = time.time() - gen_start
      if should_fail == 'meson':
          if returncode == 1:
              return TestResult('', BuildStep.configure, stdo, stde, mesonlog, gen_time)
          elif returncode != 0:
              return TestResult('Test exited with unexpected status {}'.format(returncode), BuildStep.configure, stdo, stde, mesonlog, gen_time)
          else:
              return TestResult('Test that should have failed succeeded', BuildStep.configure, stdo, stde, mesonlog, gen_time)
      if returncode != 0:
          return TestResult('Generating the build system failed.', BuildStep.configure, stdo, stde, mesonlog, gen_time)
      builddata = build.load(test_build_dir)
      # Touch the meson.build file to force a regenerate so we can test that
      # regeneration works before a build is run.
      ensure_backend_detects_changes(backend)
      os.utime(os.path.join(testdir, 'meson.build'))
      # Build with subprocess
      dir_args = get_backend_args_for_dir(backend, test_build_dir)
      build_start = time.time()
      pc, o, e = Popen_safe(compile_commands + dir_args, cwd=test_build_dir)
      build_time = time.time() - build_start
      stdo += o
      stde += e
      if should_fail == 'build':
          if pc.returncode != 0:
              return TestResult('', BuildStep.build, stdo, stde, mesonlog, gen_time)
          return TestResult('Test that should have failed to build succeeded', BuildStep.build, stdo, stde, mesonlog, gen_time)
      if pc.returncode != 0:
          return TestResult('Compiling source code failed.', BuildStep.build, stdo, stde, mesonlog, gen_time, build_time)
      # Touch the meson.build file to force a regenerate so we can test that
      # regeneration works after a build is complete.
      ensure_backend_detects_changes(backend)
      os.utime(os.path.join(testdir, 'meson.build'))
      test_start = time.time()
      # Test in-process
      (returncode, tstdo, tstde, test_log) = run_test_inprocess(test_build_dir)
      test_time = time.time() - test_start
      stdo += tstdo
      stde += tstde
      mesonlog += test_log
      if should_fail == 'test':
          if returncode != 0:
              return TestResult('', BuildStep.test, stdo, stde, mesonlog, gen_time)
          return TestResult('Test that should have failed to run unit tests succeeded', BuildStep.test, stdo, stde, mesonlog, gen_time)
      if returncode != 0:
          return TestResult('Running unit tests failed.', BuildStep.test, stdo, stde, mesonlog, gen_time, build_time, test_time)
      # Do installation, if the backend supports it
      if install_commands:
          env = os.environ.copy()
          env['DESTDIR'] = install_dir
          # Install with subprocess
          pi, o, e = Popen_safe(install_commands, cwd=test_build_dir, env=env)
          stdo += o
          stde += e
          if pi.returncode != 0:
              return TestResult('Running install failed.', BuildStep.install, stdo, stde, mesonlog, gen_time, build_time, test_time)
      # Clean with subprocess
      env = os.environ.copy()
      pi, o, e = Popen_safe(clean_commands + dir_args, cwd=test_build_dir, env=env)
      stdo += o
      stde += e
      if pi.returncode != 0:
          return TestResult('Running clean failed.', BuildStep.clean, stdo, stde, mesonlog, gen_time, build_time, test_time)
      if not install_commands:
          return TestResult('', BuildStep.install, '', '', mesonlog, gen_time, build_time, test_time)
      return TestResult(validate_install(testdir, install_dir, compiler, builddata.environment),
                        BuildStep.validate, stdo, stde, mesonlog, gen_time, build_time, test_time)
  
  def gather_tests(testdir: Path) -> List[Path]:
      test_names = [t.name for t in testdir.glob('*') if t.is_dir()]
      test_names = [t for t in test_names if not t.startswith('.')] # Filter non-tests files (dot files, etc)
      test_nums = [(int(t.split()[0]), t) for t in test_names]
      test_nums.sort()
      tests = [testdir / t[1] for t in test_nums]
      return tests
  
  def have_d_compiler():
      if shutil.which("ldc2"):
          return True
      elif shutil.which("ldc"):
          return True
      elif shutil.which("gdc"):
          return True
      elif shutil.which("dmd"):
          # The Windows installer sometimes produces a DMD install
          # that exists but segfaults every time the compiler is run.
          # Don't know why. Don't know how to fix. Skip in this case.
          cp = subprocess.run(['dmd', '--version'],
                              stdout=subprocess.PIPE,
                              stderr=subprocess.PIPE)
          if cp.stdout == b'':
              return False
          return True
      return False
  
  def have_objc_compiler():
      with AutoDeletedDir(tempfile.mkdtemp(prefix='b ', dir='.')) as build_dir:
          env = environment.Environment(None, build_dir, get_fake_options('/'))
          try:
              objc_comp = env.detect_objc_compiler(MachineChoice.HOST)
          except mesonlib.MesonException:
              return False
          if not objc_comp:
              return False
          env.coredata.process_new_compiler('objc', objc_comp, env)
          try:
              objc_comp.sanity_check(env.get_scratch_dir(), env)
          except mesonlib.MesonException:
              return False
      return True
  
  def have_objcpp_compiler():
      with AutoDeletedDir(tempfile.mkdtemp(prefix='b ', dir='.')) as build_dir:
          env = environment.Environment(None, build_dir, get_fake_options('/'))
          try:
              objcpp_comp = env.detect_objcpp_compiler(MachineChoice.HOST)
          except mesonlib.MesonException:
              return False
          if not objcpp_comp:
              return False
          env.coredata.process_new_compiler('objcpp', objcpp_comp, env)
          try:
              objcpp_comp.sanity_check(env.get_scratch_dir(), env)
          except mesonlib.MesonException:
              return False
      return True
  
  def have_java():
      if shutil.which('javac') and shutil.which('java'):
          return True
      return False
  
  def skippable(suite, test):
      if not under_ci:
          return True
  
      if not suite.endswith('frameworks'):
          return True
  
      # gtk-doc test may be skipped, pending upstream fixes for spaces in
      # filenames landing in the distro used for CI
      if test.endswith('10 gtk-doc'):
          return True
  
      # NetCDF is not in the CI image
      if test.endswith('netcdf'):
          return True
  
      # MSVC doesn't link with GFortran
      if test.endswith('14 fortran links c'):
          return True
  
      # No frameworks test should be skipped on linux CI, as we expect all
      # prerequisites to be installed
      if mesonlib.is_linux():
          return False
  
      # Boost test should only be skipped for windows CI build matrix entries
      # which don't define BOOST_ROOT
      if test.endswith('1 boost'):
          if mesonlib.is_windows():
              return 'BOOST_ROOT' not in os.environ
          return False
  
      # Qt is provided on macOS by Homebrew
      if test.endswith('4 qt') and mesonlib.is_osx():
          return False
  
      # Other framework tests are allowed to be skipped on other platforms
      return True
  
  def skip_csharp(backend):
      if backend is not Backend.ninja:
          return True
      if not shutil.which('resgen'):
          return True
      if shutil.which('mcs'):
          return False
      if shutil.which('csc'):
          # Only support VS2017 for now. Earlier versions fail
          # under CI in mysterious ways.
          try:
              stdo = subprocess.check_output(['csc', '/version'])
          except subprocess.CalledProcessError:
              return True
          # Having incrementing version numbers would be too easy.
          # Microsoft reset the versioning back to 1.0 (from 4.x)
          # when they got the Roslyn based compiler. Thus there
          # is NO WAY to reliably do version number comparisons.
          # Only support the version that ships with VS2017.
          return not stdo.startswith(b'2.')
      return True
  
  # In Azure some setups have a broken rustc that will error out
  # on all compilation attempts.
  
  def has_broken_rustc() -> bool:
      dirname = 'brokenrusttest'
      if os.path.exists(dirname):
          mesonlib.windows_proof_rmtree(dirname)
      os.mkdir(dirname)
      open(dirname + '/sanity.rs', 'w').write('''fn main() {
  }
  ''')
      pc = subprocess.run(['rustc', '-o', 'sanity.exe', 'sanity.rs'],
                          cwd=dirname,
                          stdout = subprocess.DEVNULL,
                          stderr = subprocess.DEVNULL)
      mesonlib.windows_proof_rmtree(dirname)
      return pc.returncode != 0
  
  def should_skip_rust() -> bool:
      if not shutil.which('rustc'):
          return True
      if backend is not Backend.ninja:
          return True
      if mesonlib.is_windows():
          if has_broken_rustc():
              return True
      return False
  
  def detect_tests_to_run(only: List[str]) -> List[Tuple[str, List[Path], bool]]:
      """
      Parameters
      ----------
      only: list of str, optional
          specify names of tests to run
  
      Returns
      -------
      gathered_tests: list of tuple of str, list of pathlib.Path, bool
          tests to run
      """
  
      ninja_fortran_compiler = shutil.which('gfortran') or shutil.which('flang') or shutil.which('pgfortran') or (not mesonlib.is_windows() and shutil.which('ifort'))
      ninja_fortran = backend is Backend.ninja and ninja_fortran_compiler
      vs_fortran = mesonlib.is_windows() and backend is Backend.vs and shutil.which('ifort')
      skip_fortran = not(ninja_fortran or vs_fortran)
  
      # Name, subdirectory, skip condition.
      all_tests = [
          ('cmake', 'cmake', not shutil.which('cmake') or (os.environ.get('compiler') == 'msvc2015' and under_ci)),
          ('common', 'common', False),
          ('warning-meson', 'warning', False),
          ('failing-meson', 'failing', False),
          ('failing-build', 'failing build', False),
          ('failing-test',  'failing test', False),
          ('kconfig', 'kconfig', False),
  
          ('platform-osx', 'osx', not mesonlib.is_osx()),
          ('platform-windows', 'windows', not mesonlib.is_windows() and not mesonlib.is_cygwin()),
          ('platform-linux', 'linuxlike', mesonlib.is_osx() or mesonlib.is_windows()),
  
          ('java', 'java', backend is not Backend.ninja or mesonlib.is_osx() or not have_java()),
          ('C#', 'csharp', skip_csharp(backend)),
          ('vala', 'vala', backend is not Backend.ninja or not shutil.which('valac')),
          ('rust', 'rust', should_skip_rust()),
          ('d', 'd', backend is not Backend.ninja or not have_d_compiler()),
          ('objective c', 'objc', backend not in (Backend.ninja, Backend.xcode) or not have_objc_compiler()),
          ('objective c++', 'objcpp', backend not in (Backend.ninja, Backend.xcode) or not have_objcpp_compiler()),
          ('fortran', 'fortran', skip_fortran),
          ('swift', 'swift', backend not in (Backend.ninja, Backend.xcode) or not shutil.which('swiftc')),
          ('cuda', 'cuda', backend not in (Backend.ninja, Backend.xcode) or not shutil.which('nvcc')),
          ('python3', 'python3', backend is not Backend.ninja),
          ('python', 'python', backend is not Backend.ninja),
          ('fpga', 'fpga', shutil.which('yosys') is None),
          ('frameworks', 'frameworks', False),
          ('nasm', 'nasm', False),
      ]
  
      if only:
          names = [t[0] for t in all_tests]
          ind = [names.index(o) for o in only]
          all_tests = [all_tests[i] for i in ind]
      gathered_tests = [(name, gather_tests(Path('test cases', subdir)), skip) for name, subdir, skip in all_tests]
      return gathered_tests
  
  def run_tests(all_tests, log_name_base, failfast, extra_args):
      global logfile
      txtname = log_name_base + '.txt'
      with open(txtname, 'w', encoding='utf-8', errors='ignore') as lf:
          logfile = lf
          return _run_tests(all_tests, log_name_base, failfast, extra_args)
  
  def _run_tests(all_tests, log_name_base, failfast, extra_args):
      global stop, executor, futures, system_compiler
      xmlname = log_name_base + '.xml'
      junit_root = ET.Element('testsuites')
      conf_time = 0
      build_time = 0
      test_time = 0
      passing_tests = 0
      failing_tests = 0
      skipped_tests = 0
      commands = (compile_commands, clean_commands, install_commands, uninstall_commands)
  
      try:
          # This fails in some CI environments for unknown reasons.
          num_workers = multiprocessing.cpu_count()
      except Exception as e:
          print('Could not determine number of CPUs due to the following reason:' + str(e))
          print('Defaulting to using only one process')
          num_workers = 1
      # Due to Ninja deficiency, almost 50% of build time
      # is spent waiting. Do something useful instead.
      #
      # Remove this once the following issue has been resolved:
      # https://github.com/mesonbuild/meson/pull/2082
      if not mesonlib.is_windows():  # twice as fast on Windows by *not* multiplying by 2.
          num_workers *= 2
      executor = ProcessPoolExecutor(max_workers=num_workers)
  
      for name, test_cases, skipped in all_tests:
          current_suite = ET.SubElement(junit_root, 'testsuite', {'name': name, 'tests': str(len(test_cases))})
          print()
          if skipped:
              print(bold('Not running %s tests.' % name))
          else:
              print(bold('Running %s tests.' % name))
          print()
          futures = []
          for t in test_cases:
              # Jenkins screws us over by automatically sorting test cases by name
              # and getting it wrong by not doing logical number sorting.
              (testnum, testbase) = t.name.split(' ', 1)
              testname = '%.3d %s' % (int(testnum), testbase)
              should_fail = False
              suite_args = []
              if name.startswith('failing'):
                  should_fail = name.split('failing-')[1]
              if name.startswith('warning'):
                  suite_args = ['--fatal-meson-warnings']
                  should_fail = name.split('warning-')[1]
              result = executor.submit(run_test, skipped, t.as_posix(), extra_args + suite_args,
                                       system_compiler, backend, backend_flags, commands, should_fail)
              futures.append((testname, t, result))
          for (testname, t, result) in futures:
              sys.stdout.flush()
              try:
                  result = result.result()
              except CancelledError:
                  continue
              if (result is None) or (('MESON_SKIP_TEST' in result.stdo) and (skippable(name, t.as_posix()))):
                  print(yellow('Skipping:'), t.as_posix())
                  current_test = ET.SubElement(current_suite, 'testcase', {'name': testname,
                                                                           'classname': name})
                  ET.SubElement(current_test, 'skipped', {})
                  skipped_tests += 1
              else:
                  without_install = "" if len(install_commands) > 0 else " (without install)"
                  if result.msg != '':
                      print(red('Failed test{} during {}: {!r}'.format(without_install, result.step.name, t.as_posix())))
                      print('Reason:', result.msg)
                      failing_tests += 1
                      if result.step == BuildStep.configure and result.mlog != no_meson_log_msg:
                          # For configure failures, instead of printing stdout,
                          # print the meson log if available since it's a superset
                          # of stdout and often has very useful information.
                          failing_logs.append(result.mlog)
                      elif under_ci:
                          # Always print the complete meson log when running in
                          # a CI. This helps debugging issues that only occur in
                          # a hard to reproduce environment
                          failing_logs.append(result.mlog)
                          failing_logs.append(result.stdo)
                      else:
                          failing_logs.append(result.stdo)
                      failing_logs.append(result.stde)
                      if failfast:
                          print("Cancelling the rest of the tests")
                          for (_, _, res) in futures:
                              res.cancel()
                  else:
                      print('Succeeded test%s: %s' % (without_install, t.as_posix()))
                      passing_tests += 1
                  conf_time += result.conftime
                  build_time += result.buildtime
                  test_time += result.testtime
                  total_time = conf_time + build_time + test_time
                  log_text_file(logfile, t, result.stdo, result.stde)
                  current_test = ET.SubElement(current_suite, 'testcase', {'name': testname,
                                                                           'classname': name,
                                                                           'time': '%.3f' % total_time})
                  if result.msg != '':
                      ET.SubElement(current_test, 'failure', {'message': result.msg})
                  stdoel = ET.SubElement(current_test, 'system-out')
                  stdoel.text = result.stdo
                  stdeel = ET.SubElement(current_test, 'system-err')
                  stdeel.text = result.stde
  
          if failfast and failing_tests > 0:
              break
  
      print("\nTotal configuration time: %.2fs" % conf_time)
      print("Total build time: %.2fs" % build_time)
      print("Total test time: %.2fs" % test_time)
      ET.ElementTree(element=junit_root).write(xmlname, xml_declaration=True, encoding='UTF-8')
      return passing_tests, failing_tests, skipped_tests
  
  def check_file(fname):
      linenum = 1
      with open(fname, 'rb') as f:
          lines = f.readlines()
      tabdetector = re.compile(br' *\t')
      for line in lines:
          if re.match(tabdetector, line):
              print("File %s contains a tab indent on line %d. Only spaces are permitted." % (fname, linenum))
              sys.exit(1)
          if b'\r' in line:
              print("File %s contains DOS line ending on line %d. Only unix-style line endings are permitted." % (fname, linenum))
              sys.exit(1)
          linenum += 1
  
  def check_format():
      check_suffixes = {'.c',
                        '.cpp',
                        '.cxx',
                        '.cc',
                        '.rs',
                        '.f90',
                        '.vala',
                        '.d',
                        '.s',
                        '.m',
                        '.mm',
                        '.asm',
                        '.java',
                        '.txt',
                        '.py',
                        '.swift',
                        '.build',
                        '.md',
                        }
      for (root, _, files) in os.walk('.'):
          if '.dub' in root: # external deps are here
              continue
          if 'meson-logs' in root or 'meson-private' in root:
              continue
          for fname in files:
              if os.path.splitext(fname)[1].lower() in check_suffixes:
                  bn = os.path.basename(fname)
                  if bn == 'sitemap.txt' or bn == 'meson-test-run.txt':
                      continue
                  fullname = os.path.join(root, fname)
                  check_file(fullname)
  
  def check_meson_commands_work():
      global backend, compile_commands, test_commands, install_commands
      testdir = PurePath('test cases', 'common', '1 trivial').as_posix()
      meson_commands = mesonlib.python_command + [get_meson_script()]
      with AutoDeletedDir(tempfile.mkdtemp(prefix='b ', dir='.')) as build_dir:
          print('Checking that configuring works...')
          gen_cmd = meson_commands + [testdir, build_dir] + backend_flags
          pc, o, e = Popen_safe(gen_cmd)
          if pc.returncode != 0:
              raise RuntimeError('Failed to configure {!r}:\n{}\n{}'.format(testdir, e, o))
          print('Checking that building works...')
          dir_args = get_backend_args_for_dir(backend, build_dir)
          pc, o, e = Popen_safe(compile_commands + dir_args, cwd=build_dir)
          if pc.returncode != 0:
              raise RuntimeError('Failed to build {!r}:\n{}\n{}'.format(testdir, e, o))
          print('Checking that testing works...')
          pc, o, e = Popen_safe(test_commands, cwd=build_dir)
          if pc.returncode != 0:
              raise RuntimeError('Failed to test {!r}:\n{}\n{}'.format(testdir, e, o))
          if install_commands:
              print('Checking that installing works...')
              pc, o, e = Popen_safe(install_commands, cwd=build_dir)
              if pc.returncode != 0:
                  raise RuntimeError('Failed to install {!r}:\n{}\n{}'.format(testdir, e, o))
  
  
  def detect_system_compiler():
      global system_compiler
  
      with AutoDeletedDir(tempfile.mkdtemp(prefix='b ', dir='.')) as build_dir:
          env = environment.Environment(None, build_dir, get_fake_options('/'))
          print()
          for lang in sorted(compilers.all_languages):
              try:
                  comp = env.compiler_from_language(lang, MachineChoice.HOST)
                  details = '%s %s' % (' '.join(comp.get_exelist()), comp.get_version_string())
              except mesonlib.MesonException:
                  comp = None
                  details = 'not found'
              print('%-7s: %s' % (lang, details))
  
              # note C compiler for later use by platform_fix_name()
              if lang == 'c':
                  if comp:
                      system_compiler = comp.get_id()
                  else:
                      raise RuntimeError("Could not find C compiler.")
          print()
  
  if __name__ == '__main__':
      parser = argparse.ArgumentParser(description="Run the test suite of Meson.")
      parser.add_argument('extra_args', nargs='*',
                          help='arguments that are passed directly to Meson (remember to have -- before these).')
      parser.add_argument('--backend', default=None, dest='backend',
                          choices=backendlist)
      parser.add_argument('--failfast', action='store_true',
                          help='Stop running if test case fails')
      parser.add_argument('--only', help='name of test(s) to run', nargs='+')
      options = parser.parse_args()
      setup_commands(options.backend)
  
      detect_system_compiler()
      script_dir = os.path.split(__file__)[0]
      if script_dir != '':
          os.chdir(script_dir)
      check_format()
      check_meson_commands_work()
      try:
          all_tests = detect_tests_to_run(options.only)
          (passing_tests, failing_tests, skipped_tests) = run_tests(all_tests, 'meson-test-run', options.failfast, options.extra_args)
      except StopException:
          pass
      print('\nTotal passed tests:', green(str(passing_tests)))
      print('Total failed tests:', red(str(failing_tests)))
      print('Total skipped tests:', yellow(str(skipped_tests)))
      if failing_tests > 0:
          print('\nMesonlogs of failing tests\n')
          for l in failing_logs:
              try:
                  print(l, '\n')
              except UnicodeError:
                  print(l.encode('ascii', errors='replace').decode(), '\n')
      for name, dirs, _ in all_tests:
          dir_names = (x.name for x in dirs)
          for k, g in itertools.groupby(dir_names, key=lambda x: x.split()[0]):
              tests = list(g)
              if len(tests) != 1:
                  print('WARNING: The %s suite contains duplicate "%s" tests: "%s"' % (name, k, '", "'.join(tests)))
      sys.exit(failing_tests)
  