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{ lib
, stdenv
, buildPythonPackage
, isPyPy
, fetchPypi
, setuptools
, pytestCheckHook
, libffi
, pkg-config
, pycparser
, pythonAtLeast
}:
if isPyPy then null else buildPythonPackage rec {
pname = "cffi";
version = "1.16.0";
pyproject = true;
src = fetchPypi {
inherit pname version;
hash = "sha256-vLPvQ+WGZbvaL7GYaY/K5ndkg+DEpjGqVkeAbCXgLMA=";
};
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 && lib.versionAtLeast (lib.getVersion stdenv.cc) "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:
# - 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.isDarwin ''
# Remove setup.py impurities
substituteInPlace setup.py \
--replace "'-iwithsysroot/usr/include/ffi'" "" \
--replace "'/usr/include/ffi'," "" \
--replace '/usr/include/libffi' '${lib.getDev libffi}/include'
'';
nativeBuildInputs = [
pkg-config
setuptools
];
buildInputs = [
libffi
];
propagatedBuildInputs = [
pycparser
];
# The tests use -Werror but with python3.6 clang detects some unreachable code.
env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang
"-Wno-unused-command-line-argument -Wno-unreachable-code -Wno-c++11-narrowing";
doCheck = !stdenv.hostPlatform.isMusl;
nativeCheckInputs = [
pytestCheckHook
];
meta = with lib; {
changelog = "https://github.com/python-cffi/cffi/releases/tag/v${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;
};
}
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