{ lib, stdenv, buildPythonPackage, isPyPy, fetchPypi, setuptools, pytestCheckHook, libffi, pkg-config, pycparser, }: let ccVersion = lib.getVersion stdenv.cc; in if isPyPy then null else buildPythonPackage rec { pname = "cffi"; version = "1.17.1"; pyproject = true; src = fetchPypi { inherit pname version; hash = "sha256-HDnGAWwyvEjdVFYZUOvWg24WcPKuRhKPZ89J54nFKCQ="; }; patches = [ # # Trusts the libffi library inside of nixpkgs on Apple devices. # # Based on some analysis I did: # # https://groups.google.com/g/python-cffi/c/xU0Usa8dvhk # # I believe that libffi already contains the code from Apple's fork that is # deemed safe to trust in cffi. # ./darwin-use-libffi-closures.diff ] ++ lib.optionals (stdenv.cc.isClang && (ccVersion == "boot" || lib.versionAtLeast ccVersion "13")) [ # -Wnull-pointer-subtraction is enabled with -Wextra. Suppress it to allow the following tests # to run and pass when cffi is built with newer versions of clang (including the bootstrap tools clang on Darwin): # - testing/cffi1/test_verify1.py::test_enum_usage # - testing/cffi1/test_verify1.py::test_named_pointer_as_argument ./clang-pointer-substraction-warning.diff ]; postPatch = lib.optionalString stdenv.hostPlatform.isDarwin '' # Remove setup.py impurities substituteInPlace setup.py \ --replace "'-iwithsysroot/usr/include/ffi'" "" \ --replace "'/usr/include/ffi'," "" \ --replace '/usr/include/libffi' '${lib.getDev libffi}/include' ''; nativeBuildInputs = [ pkg-config ]; build-system = [ setuptools ]; buildInputs = [ libffi ]; dependencies = [ pycparser ]; # The tests use -Werror but with python3.6 clang detects some unreachable code. env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang "-Wno-unused-command-line-argument -Wno-unreachable-code -Wno-c++11-narrowing"; doCheck = !stdenv.hostPlatform.isMusl; nativeCheckInputs = [ pytestCheckHook ]; meta = with lib; { changelog = "https://github.com/python-cffi/cffi/releases/tag/v${version}"; description = "Foreign Function Interface for Python calling C code"; downloadPage = "https://github.com/python-cffi/cffi"; homepage = "https://cffi.readthedocs.org/"; license = licenses.mit; maintainers = teams.python.members; }; }