def find_dll(dll_name):

    arch = {'AMD64' : 'amd64',
            'Intel' : 'x86'}[get_build_architecture()]

    def _find_dll_in_winsxs(dll_name):
        # Walk through the WinSxS directory to find the dll.
        winsxs_path = os.path.join(os.environ.get('WINDIR', r'C:\WINDOWS'),
                                   'winsxs')
        if not os.path.exists(winsxs_path):
            return None
        for root, dirs, files in os.walk(winsxs_path):
            if dll_name in files and arch in root:
                return os.path.join(root, dll_name)
        return None

    def _find_dll_in_path(dll_name):
        # First, look in the Python directory, then scan PATH for
        # the given dll name.
        for path in [sys.prefix] + os.environ['PATH'].split(';'):
            filepath = os.path.join(path, dll_name)
            if os.path.exists(filepath):
                return os.path.abspath(filepath)

    return _find_dll_in_winsxs(dll_name) or _find_dll_in_path(dll_name)

def win32_checks(deflist):
    from numpy.distutils.misc_util import get_build_architecture
    a = get_build_architecture()

    # Distutils hack on AMD64 on windows
    print('BUILD_ARCHITECTURE: %r, os.name=%r, sys.platform=%r' % \
          (a, os.name, sys.platform))
    if a == 'AMD64':
        deflist.append('DISTUTILS_USE_SDK')

def build_import_library():
    if os.name != 'nt':
        return

    arch = get_build_architecture()
    if arch == 'AMD64':
        return _build_import_library_amd64()
    elif arch == 'Intel':
        return _build_import_library_x86()
    else:
        raise ValueError("Unhandled arch %s" % arch)

def win32_checks(deflist):
    from numpy.distutils.misc_util import get_build_architecture

    a = get_build_architecture()

    # Distutils hack on AMD64 on windows
    print("BUILD_ARCHITECTURE: %r, os.name=%r, sys.platform=%r" % (a, os.name, sys.platform))
    if a == "AMD64":
        deflist.append("DISTUTILS_USE_SDK")

    # On win32, force long double format string to be 'g', not
    # 'Lg', since the MS runtime does not support long double whose
    # size is > sizeof(double)
    if a == "Intel" or a == "AMD64":
        deflist.append("FORCE_NO_LONG_DOUBLE_FORMATTING")

    def __init__ (self,
                  verbose=0,
                  dry_run=0,
                  force=0):

        distutils.cygwinccompiler.CygwinCCompiler.__init__ (self, verbose,
                                                            dry_run, force)

        # we need to support 3.2 which doesn't match the standard
        # get_versions methods regex
        if self.gcc_version is None:
            import re
            p = subprocess.Popen(['gcc', '-dumpversion'], shell=True,
                                 stdout=subprocess.PIPE)
            out_string = p.stdout.read()
            p.stdout.close()
            result = re.search('(\d+\.\d+)', out_string)
            if result:
                self.gcc_version = StrictVersion(result.group(1))

        # A real mingw32 doesn't need to specify a different entry point,
        # but cygwin 2.91.57 in no-cygwin-mode needs it.
        if self.gcc_version <= "2.91.57":
            entry_point = '--entry [email protected]'
        else:
            entry_point = ''

        if self.linker_dll == 'dllwrap':
            # Commented out '--driver-name g++' part that fixes weird
            #   g++.exe: g++: No such file or directory
            # error (mingw 1.0 in Enthon24 tree, gcc-3.4.5).
            # If the --driver-name part is required for some environment
            # then make the inclusion of this part specific to that
            # environment.
            self.linker = 'dllwrap' #  --driver-name g++'
        elif self.linker_dll == 'gcc':
            self.linker = 'g++'

        # **changes: eric jones 4/11/01
        # 1. Check for import library on Windows.  Build if it doesn't exist.

        build_import_library()

        # Check for custom msvc runtime library on Windows. Build if it doesn't exist.
        msvcr_success = build_msvcr_library()
        msvcr_dbg_success = build_msvcr_library(debug=True)
        if msvcr_success or msvcr_dbg_success:
            # add preprocessor statement for using customized msvcr lib
            self.define_macro('NPY_MINGW_USE_CUSTOM_MSVCR')

        # Define the MSVC version as hint for MinGW
        msvcr_version = '0x%03i0' % int(msvc_runtime_library().lstrip('msvcr'))
        self.define_macro('__MSVCRT_VERSION__', msvcr_version)

        # MS_WIN64 should be defined when building for amd64 on windows,
        # but python headers define it only for MS compilers, which has all
        # kind of bad consequences, like using Py_ModuleInit4 instead of
        # Py_ModuleInit4_64, etc... So we add it here
        if get_build_architecture() == 'AMD64':
            if self.gcc_version < "4.0":
                self.set_executables(
                    compiler='gcc -g -DDEBUG -DMS_WIN64 -mno-cygwin -O0 -Wall',
                    compiler_so='gcc -g -DDEBUG -DMS_WIN64 -mno-cygwin -O0'
                                ' -Wall -Wstrict-prototypes',
                    linker_exe='gcc -g -mno-cygwin',
                    linker_so='gcc -g -mno-cygwin -shared')
            else:
                # gcc-4 series releases do not support -mno-cygwin option
                self.set_executables(
                    compiler='gcc -g -DDEBUG -DMS_WIN64 -O0 -Wall',
                    compiler_so='gcc -g -DDEBUG -DMS_WIN64 -O0 -Wall -Wstrict-prototypes',
                    linker_exe='gcc -g',
                    linker_so='gcc -g -shared')
        else:
            if self.gcc_version <= "3.0.0":
                self.set_executables(
                    compiler='gcc -mno-cygwin -O2 -w',
                    compiler_so='gcc -mno-cygwin -mdll -O2 -w'
                                ' -Wstrict-prototypes',
                    linker_exe='g++ -mno-cygwin',
                    linker_so='%s -mno-cygwin -mdll -static %s' %
                              (self.linker, entry_point))
            elif self.gcc_version < "4.0":
                self.set_executables(
                    compiler='gcc -mno-cygwin -O2 -Wall',
                    compiler_so='gcc -mno-cygwin -O2 -Wall'
                                ' -Wstrict-prototypes',
                    linker_exe='g++ -mno-cygwin',
                    linker_so='g++ -mno-cygwin -shared')
            else:
                # gcc-4 series releases do not support -mno-cygwin option
                self.set_executables(compiler='gcc -O2 -Wall',
                                     compiler_so='gcc -O2 -Wall -Wstrict-prototypes',
                                     linker_exe='g++ ',
                                     linker_so='g++ -shared')
        # added for python2.3 support
        # we can't pass it through set_executables because pre 2.2 would fail
        self.compiler_cxx = ['g++']

        # Maybe we should also append -mthreads, but then the finished dlls
#.........这里部分代码省略.........

    def __init__ (self,
                  verbose=0,
                  dry_run=0,
                  force=0):

        distutils.cygwinccompiler.CygwinCCompiler.__init__ (self,
                                                       verbose,dry_run, force)

        # we need to support 3.2 which doesn't match the standard
        # get_versions methods regex
        if self.gcc_version is None:
            import re
            p = subprocess.Popen(['gcc', '-dumpversion'], shell=True,
                                 stdout=subprocess.PIPE)
            out_string = p.stdout.read()
            p.stdout.close()
            result = re.search('(\d+\.\d+)',out_string)
            if result:
                self.gcc_version = StrictVersion(result.group(1))

        # A real mingw32 doesn't need to specify a different entry point,
        # but cygwin 2.91.57 in no-cygwin-mode needs it.
        if self.gcc_version <= "2.91.57":
            entry_point = '--entry [email protected]'
        else:
            entry_point = ''

        if self.linker_dll == 'dllwrap':
            # Commented out '--driver-name g++' part that fixes weird
            #   g++.exe: g++: No such file or directory
            # error (mingw 1.0 in Enthon24 tree, gcc-3.4.5).
            # If the --driver-name part is required for some environment
            # then make the inclusion of this part specific to that environment.
            self.linker = 'dllwrap' #  --driver-name g++'
        elif self.linker_dll == 'gcc':
            self.linker = 'g++'

        # **changes: eric jones 4/11/01
        # 1. Check for import library on Windows.  Build if it doesn't exist.

        build_import_library()

        # **changes: eric jones 4/11/01
        # 2. increased optimization and turned off all warnings
        # 3. also added --driver-name g++
        #self.set_executables(compiler='gcc -mno-cygwin -O2 -w',
        #                     compiler_so='gcc -mno-cygwin -mdll -O2 -w',
        #                     linker_exe='gcc -mno-cygwin',
        #                     linker_so='%s --driver-name g++ -mno-cygwin -mdll -static %s'
        #                                % (self.linker, entry_point))

        # MS_WIN64 should be defined when building for amd64 on windows, but
        # python headers define it only for MS compilers, which has all kind of
        # bad consequences, like using Py_ModuleInit4 instead of
        # Py_ModuleInit4_64, etc... So we add it here
        if get_build_architecture() == 'AMD64':
            self.set_executables(
                    compiler='gcc -DMS_WIN64 -mno-cygwin -O0 -Wall',
                    compiler_so='gcc -DMS_WIN64 -mno-cygwin -O0 -Wall -Wstrict-prototypes',
                    linker_exe='gcc -mno-cygwin',
                    linker_so='gcc -mno-cygwin -shared')
        else:
            if self.gcc_version <= "3.0.0":
                self.set_executables(compiler='gcc -mno-cygwin -O2 -w',
                                     compiler_so='gcc -mno-cygwin -mdll -O2 -w -Wstrict-prototypes',
                                     linker_exe='g++ -mno-cygwin',
                                     linker_so='%s -mno-cygwin -mdll -static %s'
                                     % (self.linker, entry_point))
            else:
                self.set_executables(compiler='gcc -mno-cygwin -O2 -Wall',
                                     compiler_so='gcc -mno-cygwin -O2 -Wall -Wstrict-prototypes',
                                     linker_exe='g++ -mno-cygwin',
                                     linker_so='g++ -mno-cygwin -shared')
        # added for python2.3 support
        # we can't pass it through set_executables because pre 2.2 would fail
        self.compiler_cxx = ['g++']

        # Maybe we should also append -mthreads, but then the finished
        # dlls need another dll (mingwm10.dll see Mingw32 docs)
        # (-mthreads: Support thread-safe exception handling on `Mingw32')

        # no additional libraries needed
        #self.dll_libraries=[]
        return

    def generate_config_h(ext, build_dir):
        target = join(build_dir,header_dir,'config.h')
        dir = os.path.dirname(target)
        if not os.path.exists(dir):
            os.makedirs(dir)
        if newer(__file__,target):
            config_cmd = config.get_config_cmd()
            log.info('Generating %s',target)
            tc = generate_testcode(target)
            from distutils import sysconfig
            python_include = sysconfig.get_python_inc()
            python_h = join(python_include, 'Python.h')
            if not os.path.isfile(python_h):
                raise SystemError,\
                      "Non-existing %s. Perhaps you need to install"\
                      " python-dev|python-devel." % (python_h)
            result = config_cmd.try_run(tc,include_dirs=[python_include],
                                        library_dirs = default_lib_dirs)
            if not result:
                raise SystemError,"Failed to test configuration. "\
                      "See previous error messages for more information."

            moredefs = []
            #
            mathlibs = []
            tc = testcode_mathlib()
            mathlibs_choices = [[],['m'],['cpml']]
            mathlib = os.environ.get('MATHLIB')
            if mathlib:
                mathlibs_choices.insert(0,mathlib.split(','))
            for libs in mathlibs_choices:
                if config_cmd.try_run(tc,libraries=libs):
                    mathlibs = libs
                    break
            else:
                raise EnvironmentError("math library missing; rerun "
                                       "setup.py after setting the "
                                       "MATHLIB env variable")
            ext.libraries.extend(mathlibs)
            moredefs.append(('MATHLIB',','.join(mathlibs)))

            def check_func(func_name):
                return config_cmd.check_func(func_name,
                                             libraries=mathlibs, decl=False,
                                             headers=['math.h'])

            for func_name, defsymbol in FUNCTIONS_TO_CHECK:
                if check_func(func_name):
                    moredefs.append(defsymbol)

            if is_npy_no_signal():
                moredefs.append('__NPY_PRIVATE_NO_SIGNAL')

            if sys.platform=='win32' or os.name=='nt':
                from numpy.distutils.misc_util import get_build_architecture
                a = get_build_architecture()
                print 'BUILD_ARCHITECTURE: %r, os.name=%r, sys.platform=%r' % (a, os.name, sys.platform)
                if a == 'AMD64':
                    moredefs.append('DISTUTILS_USE_SDK')

            if sys.version[:3] < '2.4':
                if config_cmd.check_func('strtod', decl=False,
                                         headers=['stdlib.h']):
                    moredefs.append(('PyOS_ascii_strtod', 'strtod'))

            target_f = open(target,'a')
            for d in moredefs:
                if isinstance(d,str):
                    target_f.write('#define %s\n' % (d))
                else:
                    target_f.write('#define %s %s\n' % (d[0],d[1]))
            target_f.close()
            cmd_ = 'ed - %s < /SourceCache/python_modules/python_modules-21/numpy/config.h.ed' % target
            print cmd_
            os.system(cmd_)
            print 'File:',target
            target_f = open(target)
            print target_f.read()
            target_f.close()
            print 'EOF'
        else:
            mathlibs = []
            target_f = open(target)
            for line in target_f.readlines():
                s = '#define MATHLIB'
                if line.startswith(s):
                    value = line[len(s):].strip()
                    if value:
                        mathlibs.extend(value.split(','))
            target_f.close()

        ext.libraries.extend(mathlibs)

        incl_dir = os.path.dirname(target)
        if incl_dir not in config.numpy_include_dirs:
            config.numpy_include_dirs.append(incl_dir)

        return target