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File Name : gnu.py

import re
import os
import sys
import warnings
import platform
import tempfile
import hashlib
import base64
import subprocess
from subprocess import Popen, PIPE, STDOUT
from numpy.distutils.exec_command import filepath_from_subprocess_output
from numpy.distutils.fcompiler import FCompiler
from distutils.version import LooseVersion

compilers = ['GnuFCompiler', 'Gnu95FCompiler']

TARGET_R = re.compile(r"Target: ([a-zA-Z0-9_\-]*)")

# XXX: handle cross compilation

def is_win64():
    return sys.platform == "win32" and platform.architecture()[0] == "64bit"

class GnuFCompiler(FCompiler):
    compiler_type = 'gnu'
    compiler_aliases = ('g77', )
    description = 'GNU Fortran 77 compiler'

def gnu_version_match(self, version_string):
        """Handle the different versions of GNU fortran compilers"""
        # Strip warning(s) that may be emitted by gfortran
        while version_string.startswith('gfortran: warning'):
            version_string =\
                version_string[version_string.find('\n') + 1:].strip()

# Gfortran versions from after 2010 will output a simple string
        # (usually "x.y", "x.y.z" or "x.y.z-q") for ``-dumpversion``; older
        # gfortrans may still return long version strings (``-dumpversion`` was
        # an alias for ``--version``)
        if len(version_string) <= 20:
            # Try to find a valid version string
            m = re.search(r'([0-9.]+)', version_string)
            if m:
                # g77 provides a longer version string that starts with GNU
                # Fortran
                if version_string.startswith('GNU Fortran'):
                    return ('g77', m.group(1))

# gfortran only outputs a version string such as #.#.#, so check
                # if the match is at the start of the string
                elif m.start() == 0:
                    return ('gfortran', m.group(1))
        else:
            # Output probably from --version, try harder:
            m = re.search(r'GNU Fortran\s+95.*?([0-9-.]+)', version_string)
            if m:
                return ('gfortran', m.group(1))
            m = re.search(
                r'GNU Fortran.*?\-?([0-9-.]+\.[0-9-.]+)', version_string)
            if m:
                v = m.group(1)
                if v.startswith('0') or v.startswith('2') or v.startswith('3'):
                    # the '0' is for early g77's
                    return ('g77', v)
                else:
                    # at some point in the 4.x series, the ' 95' was dropped
                    # from the version string
                    return ('gfortran', v)

# If still nothing, raise an error to make the problem easy to find.
        err = 'A valid Fortran version was not found in this string:\n'
        raise ValueError(err + version_string)

def version_match(self, version_string):
        v = self.gnu_version_match(version_string)
        if not v or v[0] != 'g77':
            return None
        return v[1]

possible_executables = ['g77', 'f77']
    executables = {
        'version_cmd'  : [None, "-dumpversion"],
        'compiler_f77' : [None, "-g", "-Wall", "-fno-second-underscore"],
        'compiler_f90' : None,  # Use --fcompiler=gnu95 for f90 codes
        'compiler_fix' : None,
        'linker_so'    : [None, "-g", "-Wall"],
        'archiver'     : ["ar", "-cr"],
        'ranlib'       : ["ranlib"],
        'linker_exe'   : [None, "-g", "-Wall"]
    }
    module_dir_switch = None
    module_include_switch = None

# Cygwin: f771: warning: -fPIC ignored for target (all code is
    # position independent)
    if os.name != 'nt' and sys.platform != 'cygwin':
        pic_flags = ['-fPIC']

# use -mno-cygwin for g77 when Python is not Cygwin-Python
    if sys.platform == 'win32':
        for key in ['version_cmd', 'compiler_f77', 'linker_so', 'linker_exe']:
            executables[key].append('-mno-cygwin')

g2c = 'g2c'
    suggested_f90_compiler = 'gnu95'

def get_flags_linker_so(self):
        opt = self.linker_so[1:]
        if sys.platform == 'darwin':
            target = os.environ.get('MACOSX_DEPLOYMENT_TARGET', None)
            # If MACOSX_DEPLOYMENT_TARGET is set, we simply trust the value
            # and leave it alone.  But, distutils will complain if the
            # environment's value is different from the one in the Python
            # Makefile used to build Python.  We let distutils handle this
            # error checking.
            if not target:
                # If MACOSX_DEPLOYMENT_TARGET is not set in the environment,
                # we try to get it first from sysconfig and then
                # fall back to setting it to 10.9 This is a reasonable default
                # even when using the official Python dist and those derived
                # from it.
                import sysconfig
                target = sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET')
                if not target:
                    target = '10.9'
                    s = f'Env. variable MACOSX_DEPLOYMENT_TARGET set to {target}'
                    warnings.warn(s, stacklevel=2)
                os.environ['MACOSX_DEPLOYMENT_TARGET'] = str(target)
            opt.extend(['-undefined', 'dynamic_lookup', '-bundle'])
        else:
            opt.append("-shared")
        if sys.platform.startswith('sunos'):
            # SunOS often has dynamically loaded symbols defined in the
            # static library libg2c.a  The linker doesn't like this.  To
            # ignore the problem, use the -mimpure-text flag.  It isn't
            # the safest thing, but seems to work. 'man gcc' says:
            # ".. Instead of using -mimpure-text, you should compile all
            #  source code with -fpic or -fPIC."
            opt.append('-mimpure-text')
        return opt

def get_libgcc_dir(self):
        try:
            output = subprocess.check_output(self.compiler_f77 +
                                            ['-print-libgcc-file-name'])
        except (OSError, subprocess.CalledProcessError):
            pass
        else:
            output = filepath_from_subprocess_output(output)
            return os.path.dirname(output)
        return None

def get_libgfortran_dir(self):
        if sys.platform[:5] == 'linux':
            libgfortran_name = 'libgfortran.so'
        elif sys.platform == 'darwin':
            libgfortran_name = 'libgfortran.dylib'
        else:
            libgfortran_name = None

libgfortran_dir = None
        if libgfortran_name:
            find_lib_arg = ['-print-file-name={0}'.format(libgfortran_name)]
            try:
                output = subprocess.check_output(
                                       self.compiler_f77 + find_lib_arg)
            except (OSError, subprocess.CalledProcessError):
                pass
            else:
                output = filepath_from_subprocess_output(output)
                libgfortran_dir = os.path.dirname(output)
        return libgfortran_dir

def get_library_dirs(self):
        opt = []
        if sys.platform[:5] != 'linux':
            d = self.get_libgcc_dir()
            if d:
                # if windows and not cygwin, libg2c lies in a different folder
                if sys.platform == 'win32' and not d.startswith('/usr/lib'):
                    d = os.path.normpath(d)
                    path = os.path.join(d, "lib%s.a" % self.g2c)
                    if not os.path.exists(path):
                        root = os.path.join(d, *((os.pardir, ) * 4))
                        d2 = os.path.abspath(os.path.join(root, 'lib'))
                        path = os.path.join(d2, "lib%s.a" % self.g2c)
                        if os.path.exists(path):
                            opt.append(d2)
                opt.append(d)
        # For Macports / Linux, libgfortran and libgcc are not co-located
        lib_gfortran_dir = self.get_libgfortran_dir()
        if lib_gfortran_dir:
            opt.append(lib_gfortran_dir)
        return opt

def get_libraries(self):
        opt = []
        d = self.get_libgcc_dir()
        if d is not None:
            g2c = self.g2c + '-pic'
            f = self.static_lib_format % (g2c, self.static_lib_extension)
            if not os.path.isfile(os.path.join(d, f)):
                g2c = self.g2c
        else:
            g2c = self.g2c

if g2c is not None:
            opt.append(g2c)
        c_compiler = self.c_compiler
        if sys.platform == 'win32' and c_compiler and \
                c_compiler.compiler_type == 'msvc':
            opt.append('gcc')
        if sys.platform == 'darwin':
            opt.append('cc_dynamic')
        return opt

def get_flags_debug(self):
        return ['-g']

def get_flags_opt(self):
        v = self.get_version()
        if v and v <= '3.3.3':
            # With this compiler version building Fortran BLAS/LAPACK
            # with -O3 caused failures in lib.lapack heevr,syevr tests.
            opt = ['-O2']
        else:
            opt = ['-O3']
        opt.append('-funroll-loops')
        return opt

def _c_arch_flags(self):
        """ Return detected arch flags from CFLAGS """
        import sysconfig
        try:
            cflags = sysconfig.get_config_vars()['CFLAGS']
        except KeyError:
            return []
        arch_re = re.compile(r"-arch\s+(\w+)")
        arch_flags = []
        for arch in arch_re.findall(cflags):
            arch_flags += ['-arch', arch]
        return arch_flags

def get_flags_arch(self):
        return []

def runtime_library_dir_option(self, dir):
        if sys.platform == 'win32' or sys.platform == 'cygwin':
            # Linux/Solaris/Unix support RPATH, Windows does not
            raise NotImplementedError

# TODO: could use -Xlinker here, if it's supported
        assert "," not in dir

if sys.platform == 'darwin':
            return f'-Wl,-rpath,{dir}'
        elif sys.platform.startswith(('aix', 'os400')):
            # AIX RPATH is called LIBPATH
            return f'-Wl,-blibpath:{dir}'
        else:
            return f'-Wl,-rpath={dir}'

class Gnu95FCompiler(GnuFCompiler):
    compiler_type = 'gnu95'
    compiler_aliases = ('gfortran', )
    description = 'GNU Fortran 95 compiler'

def version_match(self, version_string):
        v = self.gnu_version_match(version_string)
        if not v or v[0] != 'gfortran':
            return None
        v = v[1]
        if LooseVersion(v) >= "4":
            # gcc-4 series releases do not support -mno-cygwin option
            pass
        else:
            # use -mno-cygwin flag for gfortran when Python is not
            # Cygwin-Python
            if sys.platform == 'win32':
                for key in [
                        'version_cmd', 'compiler_f77', 'compiler_f90',
                        'compiler_fix', 'linker_so', 'linker_exe'
                ]:
                    self.executables[key].append('-mno-cygwin')
        return v

possible_executables = ['gfortran', 'f95']
    executables = {
        'version_cmd'  : ["<F90>", "-dumpversion"],
        'compiler_f77' : [None, "-Wall", "-g", "-ffixed-form",
                          "-fno-second-underscore"],
        'compiler_f90' : [None, "-Wall", "-g",
                          "-fno-second-underscore"],
        'compiler_fix' : [None, "-Wall",  "-g","-ffixed-form",
                          "-fno-second-underscore"],
        'linker_so'    : ["<F90>", "-Wall", "-g"],
        'archiver'     : ["ar", "-cr"],
        'ranlib'       : ["ranlib"],
        'linker_exe'   : [None, "-Wall"]
    }

module_dir_switch = '-J'
    module_include_switch = '-I'

if sys.platform.startswith(('aix', 'os400')):
        executables['linker_so'].append('-lpthread')
        if platform.architecture()[0][:2] == '64':
            for key in ['compiler_f77', 'compiler_f90','compiler_fix','linker_so', 'linker_exe']:
                executables[key].append('-maix64')

g2c = 'gfortran'

def _universal_flags(self, cmd):
        """Return a list of -arch flags for every supported architecture."""
        if not sys.platform == 'darwin':
            return []
        arch_flags = []
        # get arches the C compiler gets.
        c_archs = self._c_arch_flags()
        if "i386" in c_archs:
            c_archs[c_archs.index("i386")] = "i686"
        # check the arches the Fortran compiler supports, and compare with
        # arch flags from C compiler
        for arch in ["ppc", "i686", "x86_64", "ppc64", "s390x"]:
            if _can_target(cmd, arch) and arch in c_archs:
                arch_flags.extend(["-arch", arch])
        return arch_flags

def get_flags(self):
        flags = GnuFCompiler.get_flags(self)
        arch_flags = self._universal_flags(self.compiler_f90)
        if arch_flags:
            flags[:0] = arch_flags
        return flags

def get_flags_linker_so(self):
        flags = GnuFCompiler.get_flags_linker_so(self)
        arch_flags = self._universal_flags(self.linker_so)
        if arch_flags:
            flags[:0] = arch_flags
        return flags

def get_library_dirs(self):
        opt = GnuFCompiler.get_library_dirs(self)
        if sys.platform == 'win32':
            c_compiler = self.c_compiler
            if c_compiler and c_compiler.compiler_type == "msvc":
                target = self.get_target()
                if target:
                    d = os.path.normpath(self.get_libgcc_dir())
                    root = os.path.join(d, *((os.pardir, ) * 4))
                    path = os.path.join(root, "lib")
                    mingwdir = os.path.normpath(path)
                    if os.path.exists(os.path.join(mingwdir, "libmingwex.a")):
                        opt.append(mingwdir)
        # For Macports / Linux, libgfortran and libgcc are not co-located
        lib_gfortran_dir = self.get_libgfortran_dir()
        if lib_gfortran_dir:
            opt.append(lib_gfortran_dir)
        return opt

def get_libraries(self):
        opt = GnuFCompiler.get_libraries(self)
        if sys.platform == 'darwin':
            opt.remove('cc_dynamic')
        if sys.platform == 'win32':
            c_compiler = self.c_compiler
            if c_compiler and c_compiler.compiler_type == "msvc":
                if "gcc" in opt:
                    i = opt.index("gcc")
                    opt.insert(i + 1, "mingwex")
                    opt.insert(i + 1, "mingw32")
            c_compiler = self.c_compiler
            if c_compiler and c_compiler.compiler_type == "msvc":
                return []
            else:
                pass
        return opt

def get_target(self):
        try:
            p = subprocess.Popen(
                self.compiler_f77 + ['-v'],
                stdin=subprocess.PIPE,
                stderr=subprocess.PIPE,
            )
            stdout, stderr = p.communicate()
            output = (stdout or b"") + (stderr or b"")
        except (OSError, subprocess.CalledProcessError):
            pass
        else:
            output = filepath_from_subprocess_output(output)
            m = TARGET_R.search(output)
            if m:
                return m.group(1)
        return ""

def _hash_files(self, filenames):
        h = hashlib.sha1()
        for fn in filenames:
            with open(fn, 'rb') as f:
                while True:
                    block = f.read(131072)
                    if not block:
                        break
                    h.update(block)
        text = base64.b32encode(h.digest())
        text = text.decode('ascii')
        return text.rstrip('=')

def _link_wrapper_lib(self, objects, output_dir, extra_dll_dir,
                          chained_dlls, is_archive):
        """Create a wrapper shared library for the given objects

Return an MSVC-compatible lib
        """

c_compiler = self.c_compiler
        if c_compiler.compiler_type != "msvc":
            raise ValueError("This method only supports MSVC")

object_hash = self._hash_files(list(objects) + list(chained_dlls))

if is_win64():
            tag = 'win_amd64'
        else:
            tag = 'win32'

basename = 'lib' + os.path.splitext(
            os.path.basename(objects[0]))[0][:8]
        root_name = basename + '.' + object_hash + '.gfortran-' + tag
        dll_name = root_name + '.dll'
        def_name = root_name + '.def'
        lib_name = root_name + '.lib'
        dll_path = os.path.join(extra_dll_dir, dll_name)
        def_path = os.path.join(output_dir, def_name)
        lib_path = os.path.join(output_dir, lib_name)

if os.path.isfile(lib_path):
            # Nothing to do
            return lib_path, dll_path

if is_archive:
            objects = (["-Wl,--whole-archive"] + list(objects) +
                       ["-Wl,--no-whole-archive"])
        self.link_shared_object(
            objects,
            dll_name,
            output_dir=extra_dll_dir,
            extra_postargs=list(chained_dlls) + [
                '-Wl,--allow-multiple-definition',
                '-Wl,--output-def,' + def_path,
                '-Wl,--export-all-symbols',
                '-Wl,--enable-auto-import',
                '-static',
                '-mlong-double-64',
            ])

# No PowerPC!
        if is_win64():
            specifier = '/MACHINE:X64'
        else:
            specifier = '/MACHINE:X86'

# MSVC specific code
        lib_args = ['/def:' + def_path, '/OUT:' + lib_path, specifier]
        if not c_compiler.initialized:
            c_compiler.initialize()
        c_compiler.spawn([c_compiler.lib] + lib_args)

return lib_path, dll_path

def can_ccompiler_link(self, compiler):
        # MSVC cannot link objects compiled by GNU fortran
        return compiler.compiler_type not in ("msvc", )

def wrap_unlinkable_objects(self, objects, output_dir, extra_dll_dir):
        """
        Convert a set of object files that are not compatible with the default
        linker, to a file that is compatible.
        """
        if self.c_compiler.compiler_type == "msvc":
            # Compile a DLL and return the lib for the DLL as
            # the object. Also keep track of previous DLLs that
            # we have compiled so that we can link against them.

# If there are .a archives, assume they are self-contained
            # static libraries, and build separate DLLs for each
            archives = []
            plain_objects = []
            for obj in objects:
                if obj.lower().endswith('.a'):
                    archives.append(obj)
                else:
                    plain_objects.append(obj)

chained_libs = []
            chained_dlls = []
            for archive in archives[::-1]:
                lib, dll = self._link_wrapper_lib(
                    [archive],
                    output_dir,
                    extra_dll_dir,
                    chained_dlls=chained_dlls,
                    is_archive=True)
                chained_libs.insert(0, lib)
                chained_dlls.insert(0, dll)

if not plain_objects:
                return chained_libs

lib, dll = self._link_wrapper_lib(
                plain_objects,
                output_dir,
                extra_dll_dir,
                chained_dlls=chained_dlls,
                is_archive=False)
            return [lib] + chained_libs
        else:
            raise ValueError("Unsupported C compiler")

def _can_target(cmd, arch):
    """Return true if the architecture supports the -arch flag"""
    newcmd = cmd[:]
    fid, filename = tempfile.mkstemp(suffix=".f")
    os.close(fid)
    try:
        d = os.path.dirname(filename)
        output = os.path.splitext(filename)[0] + ".o"
        try:
            newcmd.extend(["-arch", arch, "-c", filename])
            p = Popen(newcmd, stderr=STDOUT, stdout=PIPE, cwd=d)
            p.communicate()
            return p.returncode == 0
        finally:
            if os.path.exists(output):
                os.remove(output)
    finally:
        os.remove(filename)

if __name__ == '__main__':
    from distutils import log
    from numpy.distutils import customized_fcompiler
    log.set_verbosity(2)

print(customized_fcompiler('gnu').get_version())
    try:
        print(customized_fcompiler('g95').get_version())
    except Exception as e:
        print(e)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:47
..	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:47
__pycache__	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:47
__init__.py	text/plain	39.67 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
absoft.py	text/x-script.python	5.39 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
arm.py	text/plain	2.04 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
compaq.py	text/plain	3.81 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
environment.py	text/x-script.python	3.01 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
fujitsu.py	text/plain	1.3 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
g95.py	text/plain	1.3 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
gnu.py	text/x-script.python	20.02 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
hpux.py	text/plain	1.32 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
ibm.py	text/plain	3.45 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
intel.py	text/x-script.python	6.42 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
lahey.py	text/plain	1.3 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
mips.py	text/plain	1.67 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
nag.py	text/plain	2.71 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
none.py	text/plain	758 B	root/root	-rw-r--r--	2026-06-16 08:48:19
nv.py	text/plain	1.52 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
pathf95.py	text/plain	1.04 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
pg.py	text/plain	3.48 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
sun.py	text/plain	1.54 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
vast.py	text/plain	1.63 KB	root/root	-rw-r--r--	2026-06-16 08:48:19