unresolved external symbol PyMemoryView_GET_BUFFER

Hello, I'm using the following setup to try to compile a C extension module * Windows 11 x64 * CPython 3.12.4 x64 * Visual Studio Build Tools 2026 and 2022 ### pyproject.toml ```toml [build-system] requires = ["scikit-build-core", "numpy>=2.0.0"] build-backend = "scikit_build_core.build" [tool.scikit-build] cmake.version = ">=4.2" metadata.version.provider = "scikit_build_core.metadata.regex" metadata.version.input = "myapp/version.py" wheel.packages = ["myapp"] #wheel.py-api = "cp312" ``` ### CMakeList.txt ```cmake cmake_minimum_required(VERSION 4.2) project(${SKBUILD_PROJECT_NAME} LANGUAGES C VERSION ${SKBUILD_PROJECT_VERSION}) # Ensure that option() calls in subdirectories respect normal variables # set in this parent scope (e.g., disabling features in libdeflate). # Without this, CMake would ignore values set via set(...) and always use # the default provided in option(), which can lead to unexpected behavior. set(CMAKE_POLICY_DEFAULT_CMP0077 NEW) include(CMakePrintHelpers) find_package( Python REQUIRED COMPONENTS Interpreter Development.Module Development.SABIModule ${SKBUILD_SABI_COMPONENT} NumPy ) cmake_print_variables(Python3_VERSION Python3_VERSION_MAJOR Python3_VERSION_MINOR) Python_add_library(cutils MODULE WITH_SOABI USE_SABI 3.12 myapp/xil/cutils.c) # Add submodule libdeflate set(CMAKE_POSITION_INDEPENDENT_CODE ON) set(LIBDEFLATE_COMPRESSION_SUPPORT ON) set(LIBDEFLATE_GZIP_SUPPORT OFF) set(LIBDEFLATE_BUILD_GZIP OFF) add_subdirectory(ext/libdeflate EXCLUDE_FROM_ALL) add_subdirectory(ext/lz4/build/cmake EXCLUDE_FROM_ALL) add_subdirectory(ext/zstd/build/cmake EXCLUDE_FROM_ALL) target_link_libraries(cutils PRIVATE Python::NumPy libdeflate::libdeflate_static lz4_static libzstd_static) install(TARGETS cutils DESTINATION "myapp/xil") ``` When I run `python -m build -wheel` I get this error ``` * Creating isolated environment: venv+pip... * Installing packages in isolated environment: - numpy>=2.0.0 - scikit-build-core * Getting build dependencies for wheel... * Installing packages in isolated environment: - cmake>=4.2 * Building wheel... *** scikit-build-core 0.11.6 using CMake 4.2.1 (wheel) *** Configuring CMake... 2026-01-23 14:46:58,610 - scikit_build_core - WARNING - Can't find a Python library, got libdir=None, ldlibrary=None, multiarch=None, masd=None loading initial cache file C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\CMakeInit.txt -- Building for: Visual Studio 18 2026 -- Selecting Windows SDK version 10.0.26100.0 to target Windows 10.0.22631. -- The C compiler identification is MSVC 19.50.35723.0 -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/18/BuildTools/VC/Tools/MSVC/14.50.35717/bin/Hostx64/x64/cl.exe - skipped -- Detecting C compile features -- Detecting C compile features - done -- Found Python: C:/Users/user/AppData/Local/Temp/build-env-nqu5_tkx/Scripts/python.exe (found version "3.12.4") found components: Interpreter Development.Module Development.SABIModule NumPy -- Python3_VERSION="" ; Python3_VERSION_MAJOR="" ; Python3_VERSION_MINOR="" -- Creating build script for LZ4 version: 1.10.0 -- ZSTD VERSION: 1.6.0 -- CMAKE_INSTALL_PREFIX: C:/Users/user/AppData/Local/Temp/tmpt53zvnek/wheel/platlib -- CMAKE_INSTALL_LIBDIR: lib -- ZSTD_LEGACY_SUPPORT disabled -- Multi-threading support enabled -- Performing Test C_FLAG_MP -- Performing Test C_FLAG_MP - Success -- Performing Test C_FLAG_D_UNICODE -- Performing Test C_FLAG_D_UNICODE - Success -- Performing Test C_FLAG_DUNICODE -- Performing Test C_FLAG_DUNICODE - Success -- Configuring done (13.9s) -- Generating done (0.4s) -- Build files have been written to: C:/Users/user/AppData/Local/Temp/tmpt53zvnek/build *** Building project with Visual Studio 18 2026... MSBuild version 18.0.5+e22287bf1 for .NET Framework C:\Program Files (x86)\Microsoft Visual Studio\18\BuildTools\MSBuild\Microsoft\VC\v180\Microsoft.CppBuild.targets(558,5): warning MSB8029: The Intermediate directory or Output directory cannot reside under the Temporar y directory as it could lead to issues with incremental build. [C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\ZERO_CHECK.vcxproj] 1>Checking Build System C:\Program Files (x86)\Microsoft Visual Studio\18\BuildTools\MSBuild\Microsoft\VC\v180\Microsoft.CppBuild.targets(558,5): warning MSB8029: The Intermediate directory or Output directory cannot reside under the Temporar y directory as it could lead to issues with incremental build. [C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\ext\libdeflate\libdeflate_static.vcxproj] Building Custom Rule C:/Users/user/01__Workspace/myapp/ext/libdeflate/CMakeLists.txt cpu_features.c utils.c deflate_compress.c deflate_decompress.c adler32.c zlib_compress.c zlib_decompress.c Generating Code... cpu_features.c libdeflate_static.vcxproj -> C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\ext\libdeflate\Release\deflatestatic.lib C:\Program Files (x86)\Microsoft Visual Studio\18\BuildTools\MSBuild\Microsoft\VC\v180\Microsoft.CppBuild.targets(558,5): warning MSB8029: The Intermediate directory or Output directory cannot reside under the Temporar y directory as it could lead to issues with incremental build. [C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\ext\zstd\build\cmake\lib\libzstd_static.vcxproj] Building Custom Rule C:/Users/user/01__Workspace/myapp/ext/zstd/build/cmake/lib/CMakeLists.txt debug.c entropy_common.c error_private.c fse_decompress.c pool.c threading.c xxhash.c zstd_common.c fse_compress.c hist.c huf_compress.c zstd_compress.c zstd_compress_literals.c zstd_compress_sequences.c zstd_compress_superblock.c zstd_double_fast.c zstd_fast.c zstd_lazy.c zstd_ldm.c zstd_opt.c zstd_preSplit.c zstdmt_compress.c huf_decompress.c zstd_ddict.c zstd_decompress.c zstd_decompress_block.c cover.c divsufsort.c fastcover.c zdict.c libzstd_static.vcxproj -> C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\ext\zstd\build\cmake\lib\Release\zstd_static.lib C:\Program Files (x86)\Microsoft Visual Studio\18\BuildTools\MSBuild\Microsoft\VC\v180\Microsoft.CppBuild.targets(558,5): warning MSB8029: The Intermediate directory or Output directory cannot reside under the Temporar y directory as it could lead to issues with incremental build. [C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\ext\lz4\build\cmake\lz4_static.vcxproj] Building Custom Rule C:/Users/user/01__Workspace/myapp/ext/lz4/build/cmake/CMakeLists.txt lz4.c lz4file.c lz4frame.c lz4hc.c xxhash.c Generating Code... lz4_static.vcxproj -> C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\ext\lz4\build\cmake\Release\lz4.lib C:\Program Files (x86)\Microsoft Visual Studio\18\BuildTools\MSBuild\Microsoft\VC\v180\Microsoft.CppBuild.targets(558,5): warning MSB8029: The Intermediate directory or Output directory cannot reside under the Temporar y directory as it could lead to issues with incremental build. [C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\cutils.vcxproj] Building Custom Rule C:/Users/user/01__Workspace/myapp/CMakeLists.txt cutils.c C:\Users\user\01__Workspace\myapp\myapp\xil\cutils.c(814,12): warning C4047: '=': 'Py_buffer *' differs in levels of indirection from 'int' [C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\cutils.vcxproj] C:\Users\user\01__Workspace\myapp\myapp\xil\cutils.c(1414,19): warning C4047: 'initializing': 'Py_buffer *' differs in levels of indirection from 'int' [C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\cutils .vcxproj] C:\Users\user\01__Workspace\myapp\myapp\xil\cutils.c(1924,19): warning C4047: 'initializing': 'Py_buffer *' differs in levels of indirection from 'int' [C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\cutils .vcxproj] Creating library C:/Users/user/AppData/Local/Temp/tmpt53zvnek/build/Release/cutils.lib and object C:/Users/user/AppData/Local/Temp/tmpt53zvnek/build/Release/cutils.exp cutils.obj : error LNK2019: unresolved external symbol PyMemoryView_GET_BUFFER referenced in function recorder_acquire [C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\cutils.vcxproj] C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\Release\cutils.pyd : fatal error LNK1120: 1 unresolved externals [C:\Users\user\AppData\Local\Temp\tmpt53zvnek\build\cutils.vcxproj] ``` On the other hand I can compile the same code without issues if I use `setup.py` and `setuptools` ### setup.py ```python """ myapp setup file """ # To use a consistent encoding from codecs import open from os import path # Always prefer setuptools over distutils from setuptools import Extension, find_packages, setup try: import numpy except: pass def get_export_symbols(self, ext): parts = ext.name.split(".") print("parts", parts) if parts[-1] == "__init__": initfunc_name = "PyInit_" + parts[-2] else: initfunc_name = "PyInit_" + parts[-1] here = path.abspath(path.dirname(__file__)) # Get the long description from the README file long_description = open("README.md", "rt").read() with open("requirements.txt") as f: required = f.read().splitlines() with open(path.join("myapp", "version.py"), "r") as f: for line in f: if line.startswith("__version__"): version = line.split("=")[-1].strip().strip('"') break setup( name="myapp", # Versions should comply with PEP440. For a discussion on single-sourcing # the version across setup.py and the project code, see # https://packaging.python.org/en/latest/single_source_version.html version=version, description="GUI app", long_description=long_description, long_description_content_type="text/markdown", # The project's main homepage. url="", # Author details author="Daniel Hrisca", author_email="daniel.hrisca@gmail.com", # Choose your license license="Proprietary", # See https://pypi.python.org/pypi?%3Aaction=list_classifiers classifiers=[ # How mature is this project? Common values are # 3 - Alpha # 4 - Beta # 5 - Production/Stable "Development Status :: 5 - Production/Stable", # Indicate who your project is intended for "Intended Audience :: Developers", "Topic :: Software Development", "Topic :: Scientific/Engineering", # Pick your license as you wish (should match "license" above) "License :: Other/Proprietary License", # Specify the Python versions you support here. In particular, ensure # that you indicate whether you support Python 2, Python 3 or both. "Programming Language :: Python :: 3.12", ], # What does your project relate to? keywords="gui automotive", # You can just specify the packages manually here if your project is # simple. Or you can use find_packages(). packages=find_packages(exclude=["contrib", "docs", "test"]), # Alternatively, if you want to distribute just a my_module.py, uncomment # this: # py_modules=["my_module"], # List run-time dependencies here. These will be installed by pip when # your project is installed. For an analysis of "install_requires" vs pip's # requirements files see: # https://packaging.python.org/en/latest/requirements.html install_requires=required, # List additional groups of dependencies here (e.g. development # dependencies). You can install these using the following syntax, # for example: # $ pip install -e .[dev,test] extras_require={}, # If there are data files included in your packages that need to be # installed, specify them here. If using Python 2.6 or less, then these # have to be included in MANIFEST.in as well. package_data={"myapp": ["myapp/*.ui", "myapp/*.qrc", "myapp/*.png", "myapp/*.a2l", "myapp/*.dll", "myapp/*.json"]}, include_package_data=True, # Although 'package_data' is the preferred approach, in some case you may # need to place data files outside of your packages. See: # http://docs.python.org/3.4/distutils/setupscript.html#installing-additional-files # noqa # In this case, 'data_file' will be installed into '<sys.prefix>/my_data' # data_files=[('my_data', ['data/data_file'])], # To provide executable scripts, use entry points in preference to the # "scripts" keyword. Entry points provide cross-platform support and allow # pip to create the appropriate form of executable for the target platform. entry_points={ "console_scripts": [ "myapp=myapp.gui:main", ], }, ext_package="myapp.xil", ext_modules=[Extension("cutils", ["myapp/xil/cutils.c"], include_dirs=[numpy.get_include()])], ) ``` Any idea what could be the reason for the error? Thanks!