Hello,

So I manage to build healpy in Windows 10 using msys2. I have not tested if it is fully functional, but as far as I am concerned it is working great for me, so I thought I should share how I did it.

I had to hack a few things, but perhaps I am over-complicating things and I would not be surprised if I am doing something awful or unnecessary in the middle. Some of the steps I did may be fixed from the setup.py, I think. But anyway, this is what I did:

Install Msys2. After the initial update as instructed in their guidelines, I installed gcc, make, cfitsio and other essentials packages with the following command:
pacman -S --needed mingw-w64-x86_64-toolchain git subversion mercurial mingw-w64-x86_64-cmake mingw-w64-x86_64-cfitsio
Add Msys2 mingw64 folder to the path.
Download the latest version of Healpix and put it somewhere in the mingw64 folder of Msys2.
From the mingw64 console provided with Msys2, install healpix c++ version following the linux instructions. Note that you will need to link to the previously installed cfitsio library, which should be in /mingw64/include/cfitsio. When prompted for compiler, pick generic gcc
Create the healpix_cxx.pc pkg-config file for healpix and place it in mingw64/lib/pkgconfig/ within the msys2 main folder (for some reason this is not created in the installed process even when the documentation said it should)
Anyway, I am no expert in creating these files, and I created this one by hand, it works, but it might include some unnecessary things. The file looks like this:

prefix=/mingw64
libdir=${prefix}/Healpix_3.31/src/cxx/generic_gcc/lib
bindir=${prefix}/Healpix_3.31/src/cxx/generic_gcc/bin
includedir=${prefix}/Healpix_3.31/src/cxx/generic_gcc/include

Name: healpix
Description: HealPix
Version: 3.31
Libs: -L${libdir} -lhealpix_cxx -lcxxsupport -lsharp -lfftpack -lc_utils -lcfitsio -fopenmp
Libs.private: -lm -lz
Cflags: -I${includedir}

Tell python to use the mingw compiler by creating the disutils.cfg file in Lib/disutils in the python main directory, and fill it with

[build]
compiler=mingw32
[build_ext]
compiler=mingw32

This is where it gets non ideal, since I modified essential files in python, so if you know of a better alternative please let me know!

There is a problem with using ::hypot in the cmath package when called from python. I fixed this by including math.h in inlcude/pyconfig.h in the third line. I think it is possible to solve this by adding the math package before calling python.h in healpy/src/_healpy_pixel_lib.cc, but I couldn't test this.
The next issue arises from sysconfig.get_config_var("CC"), which returns None. In this case it should return mingw32. Since I do not know how to fix it, I added a catch in unixcompiler.py to set the compiler to mingw32 when it fails to get it from sysconfig (search for the line that contain the sysconfig.get_config_var("CC")). Aditionally, mingw32 needs to be recongnized as a gcc compiler, so one also needs to add or compiler_name=='mingw32 in the _is_gcc function in the same file. This is super ugly and I do not like it...
Next, there is an issue arising from python not recognizing the g++ call as a 64 bit one with compiling. The specific error is undefined reference to __imp_Py_InitModule4 . To solve this, we need to tell g++ to use the Msys64 dependence when calling gcc. I did this by adding -D MS_WIN64 in the set_sexecutables variable from the Mingw32CCompiler in the /lib/disutils/cygwincompiler.py python file, specifically in the compiler, compiler_so and compiler_cxx variables. I am fine with this modificiation, since I will only have x64 compiler in my system, but I think this very very far from ideal... I believe this ugly hack can be avoided by setting the -D MS_WIN64 in the healpy setup.py, but again I am not sure...

Well, that is it! next you can just run pip install healpy and it should work.

Disclaimer: I am no expert and I probably do not know what I am doing, so please let me know if something is wrong here! Just wanted to comment that one of the things that bugs me the most is that I link a x64 compiler to the mingw32 compiler variable in python. Although this is apparently the way it should be done according to the wiki

Hope this helps!

Uh oh!

[help] build healpy on Windows #25

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