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import sys, sysconfig, os, platform
import subprocess
import errno
# the setuptools distutils shim should make distutils available, but this will definitely do
# it, since setuptools is now required at build-time
import setuptools
sources = ['src/c/_cffi_backend.c']
libraries = ['ffi']
include_dirs = ['/usr/include/ffi',
'/usr/include/libffi'] # may be changed by pkg-config
define_macros = [('FFI_BUILDING', '1')] # for linking with libffi static library
library_dirs = []
extra_compile_args = []
extra_link_args = []
FREE_THREADED_BUILD = bool(sysconfig.get_config_var('Py_GIL_DISABLED'))
if FREE_THREADED_BUILD and sys.version_info < (3, 14):
raise RuntimeError("CFFI does not support the free-threaded build of CPython 3.13. "
"Upgrade to free-threaded 3.14 or newer to use CFFI with the "
"free-threaded build.")
def _ask_pkg_config(resultlist, option, result_prefix='', sysroot=False):
pkg_config = os.environ.get('PKG_CONFIG','pkg-config')
try:
p = subprocess.Popen([pkg_config, option, 'libffi'],
stdout=subprocess.PIPE)
except OSError as e:
if e.errno not in [errno.ENOENT, errno.EACCES]:
raise
else:
t = p.stdout.read().decode().strip()
p.stdout.close()
if p.wait() == 0:
res = t.split()
# '-I/usr/...' -> '/usr/...'
for x in res:
assert x.startswith(result_prefix)
res = [x[len(result_prefix):] for x in res]
#print 'PKG_CONFIG:', option, res
#
sysroot = sysroot and os.environ.get('PKG_CONFIG_SYSROOT_DIR', '')
if sysroot:
# old versions of pkg-config don't support this env var,
# so here we emulate its effect if needed
res = [path if path.startswith(sysroot)
else sysroot + path
for path in res]
#
resultlist[:] = res
no_compiler_found = False
def no_working_compiler_found():
sys.stderr.write("""
No working compiler found, or bogus compiler options passed to
the compiler from Python's standard "distutils" module. See
the error messages above. Likely, the problem is not related
to CFFI but generic to the setup.py of any Python package that
tries to compile C code. (Hints: on OS/X 10.8, for errors about
-mno-fused-madd see http://stackoverflow.com/questions/22313407/
Otherwise, see https://wiki.python.org/moin/CompLangPython or
the IRC channel #python on irc.libera.chat.)
Trying to continue anyway. If you are trying to install CFFI from
a build done in a different context, you can ignore this warning.
\n""")
global no_compiler_found
no_compiler_found = True
def get_config():
from distutils.core import Distribution
from distutils.sysconfig import get_config_vars
get_config_vars() # workaround for a bug of distutils, e.g. on OS/X
config = Distribution().get_command_obj('config')
return config
def ask_supports_thread():
config = get_config()
ok = (sys.platform != 'win32' and
config.try_compile('__thread int some_threadlocal_variable_42;'))
if ok:
define_macros.append(('USE__THREAD', None))
else:
ok1 = config.try_compile('int some_regular_variable_42;')
if not ok1:
no_working_compiler_found()
else:
sys.stderr.write("Note: will not use '__thread' in the C code\n")
_safe_to_ignore()
def ask_supports_sync_synchronize():
if sys.platform == 'win32' or no_compiler_found:
return
config = get_config()
ok = config.try_link('int main(void) { __sync_synchronize(); return 0; }')
if ok:
define_macros.append(('HAVE_SYNC_SYNCHRONIZE', None))
else:
sys.stderr.write("Note: will not use '__sync_synchronize()'"
" in the C code\n")
_safe_to_ignore()
def _safe_to_ignore():
sys.stderr.write("***** The above error message can be safely ignored.\n\n")
def uses_msvc():
config = get_config()
return config.try_compile('#ifndef _MSC_VER\n#error "not MSVC"\n#endif')
def use_pkg_config():
if sys.platform == 'darwin' and os.path.exists('/usr/local/bin/brew'):
use_homebrew_for_libffi()
_ask_pkg_config(include_dirs, '--cflags-only-I', '-I', sysroot=True)
_ask_pkg_config(extra_compile_args, '--cflags-only-other')
_ask_pkg_config(library_dirs, '--libs-only-L', '-L', sysroot=True)
_ask_pkg_config(extra_link_args, '--libs-only-other')
_ask_pkg_config(libraries, '--libs-only-l', '-l')
def use_homebrew_for_libffi():
# We can build by setting:
# PKG_CONFIG_PATH = $(brew --prefix libffi)/lib/pkgconfig
with os.popen('brew --prefix libffi') as brew_prefix_cmd:
prefix = brew_prefix_cmd.read().strip()
pkgconfig = os.path.join(prefix, 'lib', 'pkgconfig')
os.environ['PKG_CONFIG_PATH'] = (
os.environ.get('PKG_CONFIG_PATH', '') + ':' + pkgconfig)
if sys.platform == "win32" and uses_msvc():
if platform.machine() == "ARM64":
include_dirs.append(os.path.join("src/c/libffi_arm64/include"))
library_dirs.append(os.path.join("src/c/libffi_arm64"))
else:
COMPILE_LIBFFI = 'src/c/libffi_x86_x64' # from the CPython distribution
assert os.path.isdir(COMPILE_LIBFFI), "directory not found!"
include_dirs[:] = [COMPILE_LIBFFI]
libraries[:] = []
_filenames = [filename.lower() for filename in os.listdir(COMPILE_LIBFFI)]
_filenames = [filename for filename in _filenames
if filename.endswith('.c')]
if sys.maxsize > 2**32:
# 64-bit: unlist win32.c, and add instead win64.obj. If the obj
# happens to get outdated at some point in the future, you need to
# rebuild it manually from win64.asm.
_filenames.remove('win32.c')
extra_link_args.append(os.path.join(COMPILE_LIBFFI, 'win64.obj'))
sources.extend(os.path.join(COMPILE_LIBFFI, filename)
for filename in _filenames)
else:
use_pkg_config()
ask_supports_thread()
ask_supports_sync_synchronize()
if 'darwin' in sys.platform:
# priority is given to `pkg_config`, but always fall back on SDK's libffi.
extra_compile_args += ['-iwithsysroot/usr/include/ffi']
if 'freebsd' in sys.platform:
include_dirs.append('/usr/local/include')
library_dirs.append('/usr/local/lib')
forced_extra_objs = os.environ.get('CFFI_FORCE_STATIC', [])
if forced_extra_objs:
forced_extra_objs = forced_extra_objs.split(';')
if __name__ == '__main__':
from setuptools import setup, Distribution, Extension
class CFFIDistribution(Distribution):
def has_ext_modules(self):
# Event if we don't have extension modules (e.g. on PyPy) we want to
# claim that we do so that wheels get properly tagged as Python
# specific. (thanks dstufft!)
return True
# On PyPy, cffi is preinstalled and it is not possible, at least for now,
# to install a different version. We work around it by making the setup()
# arguments mostly empty in this case.
cpython = ('_cffi_backend' not in sys.builtin_module_names)
setup(
packages=['cffi'] if cpython else [],
package_dir={"": "src"},
package_data={'cffi': ['_cffi_include.h', 'parse_c_type.h',
'_embedding.h', '_cffi_errors.h']}
if cpython else {},
zip_safe=False,
distclass=CFFIDistribution,
ext_modules=[Extension(
name='_cffi_backend',
include_dirs=include_dirs,
sources=sources,
libraries=libraries,
define_macros=define_macros,
library_dirs=library_dirs,
extra_compile_args=extra_compile_args,
extra_link_args=extra_link_args,
extra_objects=forced_extra_objs,
)] if cpython else [],
)
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