Document procedure for building Cython extension on Windows.

[casevh]

It is possible to build a Cython extension on Windows using the GMP, MPFR, and MPC DLLs included with the gmpy2 binary wheel.

Here is the rough outline:

1. Download the gmpy2 repository - either by "git clone" or download the zip file.
2. Download and install the mingw64 compiler from www.winlibs.com. I used the following version to compile GMP, MPFR, and MPC.

https://github.com/brechtsanders/winlibs_mingw/releases/download/10.3.0-12.0.0-9.0.0-r2/winlibs-x86_64-posix-seh-gcc-10.3.0-llvm-12.0.0-mingw-w64-9.0.0-r2.zip

3. Replace cygwinccompiler.py
4. Create libpythonXXX.a file
5. Compile using:

py39 setup_cython.py build_ext -cmingw32 -I..\mingw64\shared\include -L..\mingw64\shared\lib --inplace

[phletic]

Sorry. I can't get it to work

[phletic]

Nevermind. I just got a linux VM and it works... Sorry for the trouble....

[GBillotey]

@casevh

First, thanks a lot for this input which gave me the energy to give a try myself.

I have been able to build a Cython extension with MS Visual studio linked to the GMP, MPFR, and MPC dlls included with the last gmpy2 binary and also numpy libraries.
This build was run on a github-runner and the script is available, (as I do not have access to a windows machine it included a few shots in the dark)...

The cython extension code :
https://github.com/GBillotey/Fractalshades/blob/master/src/fractalshades/mpmath_utils/FP_loop.pyx

The key parts

• includes the headers in gmpy2 installation directory
• An import library (.lib file) is necessary when calling functions in a dll - for MS Visual studio - it provides the stubs that hook up to the DLL at runtime. To generate these .lib I used dumpbin & lib executables provided by visual studio, see the dll2lib.bat which I call through the python script patch_gmpy2.py in win_build subfolder

I think including the headers and .lib files as data files within gmpy2 windows distribution would ease a lot the process, that could be run with a standard python setup.

The final content of gmpy2 install folder before running the build is

executed, folder content:
['gmp.h', 'gmpy2.cp38-win_amd64.pyd', 'gmpy2.h', 'gmpy2.pxd', 'libgcc_s_seh-1.dll', 'libgcc_s_seh-1.lib', 'libgmp-10.dll', 'libgmp-10.lib', 'libmpc-3.dll', 'libmpc-3.lib', 'libmpfr-6.dll', 'libmpfr-6.lib', 'libwinpthread-1.dll', 'libwinpthread-1.lib', 'mpc.h', 'mpf2mpfr.h', 'mpfr.h', '__init__.pxd', '__init__.py', '__pycache__']

The windows test suite still have unrelated fails, however the keys tests that call this library passed.
When the script is more polished I would be happy to share or contribute to gmpy2 documentation if it is considered a useful point.

[casevh]

@GBillotey

Thank you! You gave me a nudge in the right direction. I'll try to look at it this weekend.

BTW, fractalshades looks cool.

casevh

[GBillotey]

Thanks for the feedback on fractalshades! This is a "home-entertainment" application of gmpy, in a way ;)
Being able to compile it under windows would probably make it usable by more people.

[GBillotey]

Just a quick update : I pushed the Windows binary wheels for this project to pypi, and can confirm a "pip install" just works - gmpy2 is specified as an install dependency for the package.

https://pypi.org/project/fractalshades/0.4.3/#files

[Kalanyr]

This issue is occurring again as of Python 3.12 ( I assume because there's no pre-built wheel for Windows for 3.12 ) , I have Visual Studio 22 installed but pip can't find the gmp.h file to build

[casevh]

Can you try compiling gmpy2 from source? After cloning the source, run the following command(s) using the "x64 Native Tools Command Prompt". py -3.12 setup.py build_ext --force bdist_wheel or py -3.12 -m pip install build py -3.12 -m build --wheel Both commands should result in a binary wheel. Please let me know if this doesn't work. casevh

…

On Mon, Oct 23, 2023 at 9:51 PM Kalanyr ***@***.***> wrote: This issue is occurring again as of Python 3.12 ( I assume because there's no pre-built wheel for Windows for 3.12 ) , I have Visual Studio 22 installed but pip can't find the gmp.h file to build — Reply to this email directly, view it on GitHub <#320 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAMR23ZQP5WUTOTQWRTMABDYA5CMVAVCNFSM5KPKKEX2U5DIOJSWCZC7NNSXTN2JONZXKZKDN5WW2ZLOOQ5TCNZXGY2TGNJTGM4A> . You are receiving this because you were mentioned.Message ID: ***@***.***>