- 1 year ago
Sympy autowrap (Cython) failing with 'fatal error LNK1104: cannot open file 'build\lib.win-amd64-3.8\wrapper_module_0.cp38-win_amd64.pyd''
The error "fatal error LNK1104: cannot open file 'build\lib.win-amd64-3.8\wrapper_module_0.cp38-win_amd64.pyd'" suggests that the linker (link.exe
) is unable to find the generated Cython extension module file during the compilation process.
To resolve this issue, you can try the following steps:
Clean the build: Remove any previously generated build artifacts to ensure a clean build. Delete the
build
directory in your project's directory.Ensure Cython is installed: Make sure that Cython is installed in your Python environment. You can install it using
pip
:pip install cython
Check the Cython version: Verify that the version of Cython you are using is compatible with your Python version. Some compatibility issues may arise if you are using an incompatible version. You can check the Cython version by running:
csscython --version
Update Sympy: Update Sympy to the latest version, as there might be fixes or improvements related to the Cython code generation process.
csspip install --upgrade sympy
Retry the autowrap process: Run the autowrap process again to generate the Cython extension module. Make sure to follow the correct syntax and options for the autowrap function.
javascriptfrom sympy.utilities.autowrap import autowrap
from sympy import Symbol, sin
x = Symbol('x')
code = autowrap(sin(x), backend='Cython')
If the error persists, try specifying a different build directory by setting the
tmp
parameter of theautowrap
function. For example:lesscode = autowrap(sin(x), backend='Cython', tmp='path/to/build/dir')
Check your environment and build tools: Ensure that you have the necessary build tools and dependencies installed for compiling Cython code on your system. This includes a compatible version of Visual Studio or the Microsoft Build Tools, depending on your Python version and Windows architecture.
For Python 3.8 and later, you can use the Microsoft Build Tools for Visual Studio 2019. Make sure to install the necessary components for C++ development.
If you have multiple versions of Visual Studio installed, make sure you have set up the appropriate environment variables (
VS90COMNTOOLS
,VS100COMNTOOLS
, etc.) to point to the correct version of the build tools.
By following these steps, you should be able to resolve the "LNK1104: cannot open file" error and successfully compile the Cython extension module using Sympy's autowrap function.