cffi does not compile

[ogermer]

While installing the requirements I run into an error: cffi does not compile.

See error message below:

`Building wheels for collected packages: cffi
Building wheel for cffi (pyproject.toml) ... error
error: subprocess-exited-with-error

× Building wheel for cffi (pyproject.toml) did not run successfully.
│ exit code: 1
╰─> [48 lines of output]
running bdist_wheel
running build
running build_py
creating build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/_imp_emulation.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/backend_ctypes.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/error.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/setuptools_ext.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/_shimmed_dist_utils.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/init.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/cffi_opcode.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/vengine_gen.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/pkgconfig.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/model.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/ffiplatform.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/api.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/vengine_cpy.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/commontypes.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/lock.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/recompiler.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/cparser.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/verifier.py -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/_cffi_include.h -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/parse_c_type.h -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/_embedding.h -> build/lib.macosx-14.0-arm64-cpython-313/cffi
copying src/cffi/_cffi_errors.h -> build/lib.macosx-14.0-arm64-cpython-313/cffi
running build_ext
building '_cffi_backend' extension
creating build/temp.macosx-14.0-arm64-cpython-313/src/c
clang -fno-strict-overflow -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk -DFFI_BUILDING=1 -DUSE__THREAD -DHAVE_SYNC_SYNCHRONIZE -I/Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/ffi "-I/Users/<...>/bnetza-emf-scraper/venv/include" -I/opt/homebrew/opt/[email protected]/Frameworks/Python.framework/Versions/3.13/include/python3.13 -c src/c/_cffi_backend.c -o build/temp.macosx-14.0-arm64-cpython-313/src/c/_cffi_backend.o -iwithsysroot/usr/include/ffi
src/c/_cffi_backend.c:4532:22: warning: 'Py_FileSystemDefaultEncoding' is deprecated [-Wdeprecated-declarations]
4532 | Py_FileSystemDefaultEncoding, &filename_or_null, &flags))
| ^
/opt/homebrew/opt/[email protected]/Frameworks/Python.framework/Versions/3.13/include/python3.13/fileobject.h:22:1: note: 'Py_FileSystemDefaultEncoding' has been explicitly marked deprecated here
22 | Py_DEPRECATED(3.12) PyAPI_DATA(const char *) Py_FileSystemDefaultEncoding;
| ^
/opt/homebrew/opt/[email protected]/Frameworks/Python.framework/Versions/3.13/include/python3.13/pyport.h:251:54: note: expanded from macro 'Py_DEPRECATED'
251 | #define Py_DEPRECATED(VERSION_UNUSED) attribute((deprecated))
| ^
src/c/_cffi_backend.c:6121:9: error: call to undeclared function '_PyErr_WriteUnraisableMsg'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
6121 | _PyErr_WriteUnraisableMsg(PyText_AS_UTF8(s), NULL);
| ^
src/c/_cffi_backend.c:6121:9: note: did you mean 'PyErr_WriteUnraisable'?
/opt/homebrew/opt/[email protected]/Frameworks/Python.framework/Versions/3.13/include/python3.13/pyerrors.h:233:18: note: 'PyErr_WriteUnraisable' declared here
233 | PyAPI_FUNC(void) PyErr_WriteUnraisable(PyObject *);
| ^
1 warning and 1 error generated.
error: command '/usr/bin/clang' failed with exit code 1
[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed building wheel for cffi
Failed to build cffi`

[ogermer]

bouncing cffi to 1.17.1 in requirements.txt solved the problem

https://cffi.readthedocs.io/en/stable/