Instructions to build mingwpy from source

[ogrisel]

Give detailed instructions to re-build the mingwpy binary distributions from source.

[carlkl]

The first part is pushed into this branch:

https://github.com/mingwpy/mingw-builds/tree/mingwpy-dev

see all diffs:

https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2FniXman%2Fmingw-builds%2Fcompare%2Fdevelop...mingwpy%3Amingwpy-dev&sa=D&sntz=1&usg=AFQjCNH6rnorWMdlTOsDusFkmJkF0VpZoQ

The FPU patch (not a patch but a seqeunce of sed commands) is still missing and will follow.

[ogrisel]

Thanks, I will give it a try today. Are there any command-line options to pass to the script or should I use the default options (besides gcc version and target architecture)?

[ogrisel]

I just found the mingwpy_readme.md, sorry for the noise.

[ogrisel]

Some notes while I am testing:

• need to install git and texinfo (missing dep for the build script) with pacman.

• then to download the build scripts:

  git clone -b mingwpy-dev https://github.com/mingwpy/mingw-builds.git
  cd mingw-builds
  

• then to build faster on a machine with 8 cores, here is an additional CLI option for ./build: --jobs=8

[carlkl]

I made an update on mingwpy_readme.md. Be aware, that this is very much work in progress.

[ogrisel]

Thanks, I could get a 64-bit build of gcc / gfortran to build successfully. I used it to build OpenBLAS master from source on windows and could then compile time_dgemm.c and measured 75 GFLOPS on that host. Great work!

To build numpy I assume this is more complex as we need to get changes in numpy's distutils first right?

[ogrisel]

BTW if other people are interested in reproducing this build, I just realised that it's currently free to download the official 64 bit Windows 10 ISO (for instance to run in VirtualBox):

https://www.microsoft.com/en-us/software-download/windows10ISO

[carlkl]

@ogrisel, you can also use the https://github.com/mingwpy/OpenBLAS/tree/mingwpy-dev branch to compile OpenBLAS. There are still some actions missing from my side:

• patch the gcc specs file to avoid linking to msvcrt
• add manifest resources to the specs and to the lib folder (essential for msvcr90)
• add -mincoming-stack-boundary=2 to the specs (win32)
• add -mlong-double-64 (i'm trying to patch the gcc source tree for that purpose)
• add -DMS_WIN64 to the specs (amd64)
• patch FPU default settings in mingw-w64 crt to MS ABI standard

and of course

• renewed numpy PR for mingwpy usage

[carlkl]

and I forgot the fpclassify patch for win32.