def qmake_detect(self, mods, kwargs):
     pc = subprocess.Popen(["qmake", "-v"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     (stdo, _) = pc.communicate()
     if pc.returncode != 0:
         return
     stdo = stdo.decode()
     if not "version 5" in stdo:
         mlog.log("QMake is not for Qt5.")
         return
     self.version = re.search("5(\.\d+)+", stdo).match(0)
     (stdo, _) = subprocess.Popen(["qmake", "-query"], stdout=subprocess.PIPE).communicate()
     qvars = {}
     for line in stdo.decode().split("\n"):
         line = line.strip()
         if line == "":
             continue
         (k, v) = tuple(line.split(":", 1))
         qvars[k] = v
     if mesonlib.is_osx():
         return self.framework_detect(qvars, mods, kwargs)
     incdir = qvars["QT_INSTALL_HEADERS"]
     self.cargs.append("-I" + incdir)
     libdir = qvars["QT_INSTALL_LIBS"]
     bindir = qvars["QT_INSTALL_BINS"]
     # self.largs.append('-L' + libdir)
     for module in mods:
         mincdir = os.path.join(incdir, "Qt" + module)
         self.cargs.append("-I" + mincdir)
         libfile = os.path.join(libdir, "Qt5" + module + ".lib")
         if not os.path.isfile(libfile):
             # MinGW links directly to .dll, not to .lib.
             libfile = os.path.join(bindir, "Qt5" + module + ".dll")
         self.largs.append(libfile)
     self.is_found = True

 def __init__(self, kwargs):
     Dependency.__init__(self)
     self.is_found = False
     self.cargs = []
     self.linkargs = []
     sdlconf = shutil.which('sdl2-config')
     if sdlconf:
         pc = subprocess.Popen(['sdl2-config', '--cflags'], stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
         (stdo, _) = pc.communicate()
         self.cargs = stdo.decode().strip().split()
         pc = subprocess.Popen(['sdl2-config', '--libs'], stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
         (stdo, _) = pc.communicate()
         self.linkargs = stdo.decode().strip().split()
         self.is_found = True
         mlog.log('Dependency', mlog.bold('sdl2'), 'found:', mlog.green('YES'), '(%s)' % sdlconf)
         return
     try:
         pcdep = PkgConfigDependency('sdl2', kwargs)
         if pcdep.found():
             self.is_found = True
             self.cargs = pcdep.get_compile_args()
             self.linkargs = pcdep.get_link_args()
             return
     except Exception:
         pass
     if mesonlib.is_osx():
         fwdep = ExtraFrameworkDependency('sdl2', kwargs.get('required', True))
         if fwdep.found():
             self.is_found = True
             self.cargs = fwdep.get_compile_args()
             self.linkargs = fwdep.get_link_args()
             return
     mlog.log('Dependency', mlog.bold('sdl2'), 'found:', mlog.red('NO'))

def find_external_dependency(name, environment, kwargs):
    required = kwargs.get("required", True)
    if not isinstance(required, bool):
        raise DependencyException('Keyword "required" must be a boolean.')
    lname = name.lower()
    if lname in packages:
        dep = packages[lname](environment, kwargs)
        if required and not dep.found():
            raise DependencyException('Dependency "%s" not found' % name)
        return dep
    pkg_exc = None
    pkgdep = None
    try:
        pkgdep = PkgConfigDependency(name, environment, kwargs)
        if pkgdep.found():
            return pkgdep
    except Exception as e:
        pkg_exc = e
    if mesonlib.is_osx():
        fwdep = ExtraFrameworkDependency(name, required)
        if required and not fwdep.found():
            raise DependencyException('Dependency "%s" not found' % name)
        return fwdep
    if pkg_exc is not None:
        raise pkg_exc
    mlog.log("Dependency", mlog.bold(name), "found:", mlog.red("NO"))
    return pkgdep

 def __init__(self, environment, kwargs):
     Dependency.__init__(self)
     self.is_found = False
     self.cargs = []
     self.linkargs = []
     sdlconf = shutil.which("sdl2-config")
     if sdlconf:
         pc = subprocess.Popen(["sdl2-config", "--cflags"], stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
         (stdo, _) = pc.communicate()
         self.cargs = stdo.decode().strip().split()
         pc = subprocess.Popen(["sdl2-config", "--libs"], stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
         (stdo, _) = pc.communicate()
         self.linkargs = stdo.decode().strip().split()
         self.is_found = True
         mlog.log("Dependency", mlog.bold("sdl2"), "found:", mlog.green("YES"), "(%s)" % sdlconf)
         return
     try:
         pcdep = PkgConfigDependency("sdl2", kwargs)
         if pcdep.found():
             self.is_found = True
             self.cargs = pcdep.get_compile_args()
             self.linkargs = pcdep.get_link_args()
             return
     except Exception:
         pass
     if mesonlib.is_osx():
         fwdep = ExtraFrameworkDependency("sdl2", kwargs.get("required", True))
         if fwdep.found():
             self.is_found = True
             self.cargs = fwdep.get_compile_args()
             self.linkargs = fwdep.get_link_args()
             return
     mlog.log("Dependency", mlog.bold("sdl2"), "found:", mlog.red("NO"))

 def qmake_detect(self, mods, kwargs):
     pc = subprocess.Popen(['qmake', '-v'], stdout=subprocess.PIPE,
                           stderr=subprocess.PIPE)
     (stdo, _) = pc.communicate()
     if pc.returncode != 0:
         return
     stdo = stdo.decode()
     if not 'version 5' in stdo:
         mlog.log('QMake is not for Qt5.')
         return
     self.version = re.search('5(\.\d+)+', stdo).group(0)
     (stdo, _) = subprocess.Popen(['qmake', '-query'], stdout=subprocess.PIPE).communicate()
     qvars = {}
     for line in stdo.decode().split('\n'):
         line = line.strip()
         if line == '':
             continue
         (k, v) = tuple(line.split(':', 1))
         qvars[k] = v
     if mesonlib.is_osx():
         return self.framework_detect(qvars, mods, kwargs)
     incdir = qvars['QT_INSTALL_HEADERS']
     self.cargs.append('-I' + incdir)
     libdir = qvars['QT_INSTALL_LIBS']
     bindir = qvars['QT_INSTALL_BINS']
     #self.largs.append('-L' + libdir)
     for module in mods:
         mincdir = os.path.join(incdir, 'Qt' + module)
         self.cargs.append('-I' + mincdir)
         libfile = os.path.join(libdir, 'Qt5' + module + '.lib')
         if not os.path.isfile(libfile):
             # MinGW links directly to .dll, not to .lib.
             libfile = os.path.join(bindir, 'Qt5' + module + '.dll')
         self.largs.append(libfile)
     self.is_found = True

def detect_tests_to_run():
    all_tests = []
    all_tests.append(('common', gather_tests('test cases/common'), False))
    all_tests.append(('failing', gather_tests('test cases/failing'), False))
    all_tests.append(('prebuilt object', gather_tests('test cases/prebuilt object'), False))

    all_tests.append(('platform-osx', gather_tests('test cases/osx'), False if mesonlib.is_osx() else True))
    all_tests.append(('platform-windows', gather_tests('test cases/windows'), False if mesonlib.is_windows() else True))
    all_tests.append(('platform-linux', gather_tests('test cases/linuxlike'), False if not (mesonlib.is_osx() or mesonlib.is_windows()) else True))
    all_tests.append(('framework', gather_tests('test cases/frameworks'), False if not mesonlib.is_osx() and not mesonlib.is_windows() else True))
    all_tests.append(('java', gather_tests('test cases/java'), False if not mesonlib.is_osx() and shutil.which('javac') else True))
    all_tests.append(('C#', gather_tests('test cases/csharp'), False if shutil.which('mcs') else True))
    all_tests.append(('vala', gather_tests('test cases/vala'), False if shutil.which('valac') else True))
    all_tests.append(('rust', gather_tests('test cases/rust'), False if shutil.which('rustc') else True))
    all_tests.append(('objective c', gather_tests('test cases/objc'), False if not mesonlib.is_windows() else True))
    all_tests.append(('fortran', gather_tests('test cases/fortran'), False if shutil.which('gfortran') else True))
    return all_tests

    def __init__(self, source_dir, build_dir, main_script_file, options):
        assert(os.path.isabs(main_script_file))
        assert(not os.path.islink(main_script_file))
        self.source_dir = source_dir
        self.build_dir = build_dir
        self.meson_script_file = main_script_file
        self.scratch_dir = os.path.join(build_dir, Environment.private_dir)
        self.log_dir = os.path.join(build_dir, Environment.log_dir)
        os.makedirs(self.scratch_dir, exist_ok=True)
        os.makedirs(self.log_dir, exist_ok=True)
        try:
            cdf = os.path.join(self.get_build_dir(), Environment.coredata_file)
            self.coredata = coredata.load(cdf)
            self.first_invocation = False
        except FileNotFoundError:
            self.coredata = coredata.CoreData(options)
            self.first_invocation = True
        if self.coredata.cross_file:
            self.cross_info = CrossBuildInfo(self.coredata.cross_file)
        else:
            self.cross_info = None
        self.cmd_line_options = options

        # List of potential compilers.
        if mesonlib.is_windows():
            self.default_c = ['cl', 'cc', 'gcc']
            self.default_cpp = ['cl', 'c++', 'g++']
        else:
            self.default_c = ['cc']
            self.default_cpp = ['c++']
        self.default_objc = ['cc']
        self.default_objcpp = ['c++']
        self.default_fortran = ['gfortran', 'g95', 'f95', 'f90', 'f77']
        self.default_static_linker = 'ar'
        self.vs_static_linker = 'lib'

        cross = self.is_cross_build()
        if (not cross and mesonlib.is_windows()) \
        or (cross and self.cross_info.has_host() and self.cross_info.config['host_machine']['system'] == 'windows'):
            self.exe_suffix = 'exe'
            self.import_lib_suffix = 'lib'
            self.shared_lib_suffix = 'dll'
            self.shared_lib_prefix = ''
            self.static_lib_suffix = 'lib'
            self.static_lib_prefix = ''
            self.object_suffix = 'obj'
        else:
            self.exe_suffix = ''
            if (not cross and mesonlib.is_osx()) or \
            (cross and self.cross_info.has_host() and self.cross_info.config['host_machine']['system'] == 'darwin'):
                self.shared_lib_suffix = 'dylib'
            else:
                self.shared_lib_suffix = 'so'
            self.shared_lib_prefix = 'lib'
            self.static_lib_suffix = 'a'
            self.static_lib_prefix = 'lib'
            self.object_suffix = 'o'
            self.import_lib_suffix = self.shared_lib_suffix

def platform_fix_filename(fname):
    if mesonlib.is_osx():
        if fname.endswith('.so'):
            return fname[:-2] + 'dylib'
        return fname.replace('.so.', '.dylib.')
    elif mesonlib.is_windows():
        if fname.endswith('.so'):
            (p, f) = os.path.split(fname)
            f = f[3:-2] + 'dll'
            return os.path.join(p, f)
        if fname.endswith('.a'):
            return fname[:-1] + 'lib'
    return fname

def gen_symbols(libfilename, outfilename, cross_host):
    if cross_host is not None:
        # In case of cross builds just always relink.
        # In theory we could determine the correct
        # toolset but there are more important things
        # to do.
        dummy_syms(outfilename)
    elif mesonlib.is_linux():
        linux_syms(libfilename, outfilename)
    elif mesonlib.is_osx():
        osx_syms(libfilename, outfilename)
    else:
        dummy_syms(outfilename)

    def extract_libtool_shlib(self, la_file):
        """
        Returns the path to the shared library
        corresponding to this .la file
        """
        dlname = self.extract_dlname_field(la_file)
        if dlname is None:
            return None

        # Darwin uses absolute paths where possible; since the libtool files never
        # contain absolute paths, use the libdir field
        if mesonlib.is_osx():
            dlbasename = os.path.basename(dlname)
            libdir = self.extract_libdir_field(la_file)
            if libdir is None:
                return dlbasename
            return os.path.join(libdir, dlbasename)
        # From the comments in extract_libtool(), older libtools had
        # a path rather than the raw dlname
        return os.path.basename(dlname)

def find_external_dependency(name, kwargs):
    required = kwargs.get('required', True)
    if not isinstance(required, bool):
        raise DependencyException('Keyword "required" must be a boolean.')
    if name in packages:
        dep = packages[name](kwargs)
        if required and not dep.found():
            raise DependencyException('Dependency "%s" not found' % name)
        return dep
    pkg_exc = None
    pkgdep = None
    try:
        pkgdep = PkgConfigDependency(name, required)
        if pkgdep.found():
            return pkgdep
    except Exception as e:
        pkg_exc = e
    if mesonlib.is_osx():
        return ExtraFrameworkDependency(name, required)
    if pkg_exc is not None:
        raise pkg_exc
    return pkgdep

 def __init__(self, environment, kwargs):
     Dependency.__init__(self)
     self.is_found = False
     self.cargs = []
     self.linkargs = []
     try:
         pcdep = PkgConfigDependency('gl', environment, kwargs)
         if pcdep.found():
             self.is_found = True
             self.cargs = pcdep.get_compile_args()
             self.linkargs = pcdep.get_link_args()
             return
     except Exception:
         pass
     if mesonlib.is_osx():
         self.is_found = True
         self.linkargs = ['-framework', 'OpenGL']
         return
     if mesonlib.is_windows():
         self.is_found = True
         self.linkargs = ['-lopengl32']
         return

    def detect_lib_modules_nix(self):
        libsuffix = None
        if mesonlib.is_osx():
            libsuffix = 'dylib'
        else:
            libsuffix = 'so'

        globber = 'libboost_*.{}'.format(libsuffix)
        if self.boost_root is None:
            libdirs = mesonlib.get_library_dirs()
        else:
            libdirs = [os.path.join(self.boost_root, 'lib')]
        for libdir in libdirs:
            for entry in glob.glob(os.path.join(libdir, globber)):
                lib = os.path.basename(entry)
                name = lib.split('.')[0].split('_', 1)[-1]
                # I'm not 100% sure what to do here. Some distros
                # have modules such as thread only as -mt versions.
                if entry.endswith('-mt.so'):
                    self.lib_modules_mt[name] = True
                else:
                    self.lib_modules[name] = True

def setup_commands(backend):
    global backend_flags, compile_commands, test_commands, install_commands
    msbuild_exe = shutil.which('msbuild')
    if backend == 'vs2010' or (backend is None and msbuild_exe is not None):
        backend_flags = ['--backend=vs2010']
        compile_commands = ['msbuild']
        test_commands = ['msbuild', 'RUN_TESTS.vcxproj']
        install_commands = []
    elif backend == 'xcode' or (backend is None and mesonlib.is_osx()):
        backend_flags = ['--backend=xcode']
        compile_commands = ['xcodebuild']
        test_commands = ['xcodebuild', '-target', 'RUN_TESTS']
        install_commands = []
    else:
        backend_flags = []
        ninja_command = environment.detect_ninja()
        if ninja_command is None:
            raise RuntimeError('Could not find Ninja executable.')
        if print_debug:
            compile_commands = [ninja_command, '-v']
        else:
            compile_commands = [ninja_command]
        test_commands = [ninja_command, 'test']
        install_commands = [ninja_command, 'install']

def run_tests():
    logfile = open('meson-test-run.txt', 'w')
    commontests = gather_tests('test cases/common')
    failtests = gather_tests('test cases/failing')
    objtests = gather_tests('test cases/prebuilt object')
    if mesonlib.is_linux():
        cpuid = platform.machine()
        if cpuid != 'x86_64' and cpuid != 'i386' and cpuid != 'i686':
            # Don't have a prebuilt object file for those so skip.
            objtests = []
    if mesonlib.is_osx():
        platformtests = gather_tests('test cases/osx')
    elif mesonlib.is_windows():
        platformtests = gather_tests('test cases/windows')
    else:
        platformtests = gather_tests('test cases/linuxlike')
    if not mesonlib.is_osx() and not mesonlib.is_windows():
        frameworktests = gather_tests('test cases/frameworks')
    else:
        frameworktests = []
    if not mesonlib.is_osx() and shutil.which('javac'):
        javatests = gather_tests('test cases/java')
    else:
        javatests = []
    if shutil.which('mcs'):
        cstests = gather_tests('test cases/csharp')
    else:
        cstests = []
    if shutil.which('valac'):
        valatests = gather_tests('test cases/vala')
    else:
        valatests = []
    if shutil.which('rustc'):
        rusttests = gather_tests('test cases/rust')
    else:
        rusttests = []
    if not mesonlib.is_windows():
        objctests = gather_tests('test cases/objc')
    else:
        objctests = []
    if shutil.which('gfortran'):
        fortrantests = gather_tests('test cases/fortran')
    else:
        fortrantests = []
    try:
        os.mkdir(test_build_dir)
    except OSError:
        pass
    try:
        os.mkdir(install_dir)
    except OSError:
        pass
    print('\nRunning common tests.\n')
    [run_and_log(logfile, t) for t in commontests]
    print('\nRunning failing tests.\n')
    [run_and_log(logfile, t, False) for t in failtests]
    if len(objtests) > 0:
        print('\nRunning object inclusion tests.\n')
        [run_and_log(logfile, t) for t in objtests]
    else:
        print('\nNo object inclusion tests.\n')
    if len(platformtests) > 0:
        print('\nRunning platform dependent tests.\n')
        [run_and_log(logfile, t) for t in platformtests]
    else:
        print('\nNo platform specific tests.\n')
    if len(frameworktests) > 0:
        print('\nRunning framework tests.\n')
        [run_and_log(logfile, t) for t in frameworktests]
    else:
        print('\nNo framework tests on this platform.\n')
    if len(javatests) > 0:
        print('\nRunning java tests.\n')
        [run_and_log(logfile, t) for t in javatests]
    else:
        print('\nNot running Java tests.\n')
    if len(cstests) > 0:
        print('\nRunning C# tests.\n')
        [run_and_log(logfile, t) for t in cstests]
    else:
        print('\nNot running C# tests.\n')
    if len(valatests) > 0:
        print('\nRunning Vala tests.\n')
        [run_and_log(logfile, t) for t in valatests]
    else:
        print('\nNot running Vala tests.\n')
    if len(rusttests) > 0:
        print('\nRunning Rust tests.\n')
        [run_and_log(logfile, t) for t in rusttests]
    else:
        print('\nNot running Rust tests.\n')
    if len(objctests) > 0:
        print('\nRunning Objective C tests.\n')
        [run_and_log(logfile, t) for t in objctests]
    else:
        print('\nNo Objective C tests on this platform.\n')
    if len(fortrantests) > 0:
        print('\nRunning Fortran tests.\n')
        [run_and_log(logfile, t) for t in fortrantests]
    else:
#.........这里部分代码省略.........

    return suffix in obj_suffixes

gnulike_buildtype_args = {'plain' : [],
                           'debug' : ['-g'],
                           'debugoptimized' : ['-O2', '-g'],
                           'release' : ['-O3'],
                           }

msvc_buildtype_args = {'plain' : [],
                        'debug' : ["/MDd", "/Zi", "/Ob0", "/Od", "/RTC1"],
                        'debugoptimized' : ["/MD", "/Zi", "/O2", "/Ob1", "/D"],
                        'release' : ["/MD", "/O2", "/Ob2"]}

gnulike_buildtype_linker_args = {}

if mesonlib.is_osx():
    gnulike_buildtype_linker_args.update({'plain' : [],
                                          'debug' : [],
                                          'debugoptimized' : [],
                                          'release' : [],
                                          })
else:
    gnulike_buildtype_linker_args.update({'plain' : [],
                                          'debug' : [],
                                          'debugoptimized' : [],
                                          'release' : ['-Wl,-O1'],
                                          })

msvc_buildtype_linker_args = {'plain' : [],
                               'debug' : [],
                               'debugoptimized' : [],

 def found(self):
     return mesonlib.is_osx()