Re: [Numpy-discussion] Building Numpy with OpenBLAS

On Wed, Jan 27, 2016 at 3:51 PM, G Young wrote:

I don't need it at this point. I'm just going through the exercise for purposes of updating building from source on Windows. But that's good to know though. Thanks!

That effort is much appreciated by the way. Updating the build info on all platforms on http://scipy.org/scipylib/building/index.html is a significant amount of work, and it has never been in a state one could call complete. So more contributions definitely welcome! Ralf

Greg

On Wed, Jan 27, 2016 at 2:48 PM, Ralf Gommers wrote:

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On Wed, Jan 27, 2016 at 3:19 PM, G Young wrote:

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NumPy will "build" successfully, but then when I type "import numpy", it cannot import the multiarray PYD file.

I am using dependency walker, and that's how I know it's the libopenblas.dll file that it's not linking to properly, hence my original question.

The support for MingwPy in numpy.distutils had to be temporarily reverted (see https://github.com/numpy/numpy/pull/6536), because the patch caused other issues. So likely it just won't work out of the box now. If you need it, maybe you can reapply that reverted patch. But otherwise I'd wait a little bit; we'll sort out the MingwPy build in the near future.

Ralf

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Greg

On Wed, Jan 27, 2016 at 1:58 PM, Michael Sarahan wrote:

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When you say find/use, can you please clarify whether you have completed the compilation/linking successfully? I'm not clear on exactly when you're having problems. What is the error output?

One very helpful tool in diagnosing dll problems is dependency walker: http://www.dependencywalker.com/

It may be that your openblas has a dependency that it can't load for some reason. Dependency walker works on .pyd files as well as .dll files.

Hth, Michael

On Wed, Jan 27, 2016, 07:40 G Young wrote:

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I do have my site.cfg file pointing to my library which contains a .lib file along with the appropriate include_dirs parameter. However, NumPy can't seem to find / use the DLL file no matter where I put it (numpy/core, same directory as openblas.lib). By the way, I should mention that I am using a slightly dated version of OpenBLAS (0.2.9), but that shouldn't have any effect I would imagine.

Greg

On Wed, Jan 27, 2016 at 1:14 PM, Michael Sarahan wrote:

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I'm not sure about the mingw tool chain, but usually on windows at link time you need a .lib file, called the import library. The .dll is used at runtime, not at link time. This is different from *nix, where the .so serves both purposes. The link you posted mentions import files, so I hope this is helpful information.

Best, Michael

On Wed, Jan 27, 2016, 03:39 G Young wrote:

> Hello all, > > I'm trying to update the documentation for building Numpy from > source, and I've hit a brick wall in trying to build the library using > OpenBLAS because I can't seem to link the libopenblas.dll file. I tried > following the suggestion of placing the DLL in numpy/core as suggested > here > https://github.com/numpy/numpy/wiki/Mingw-static-toolchain#notes but > it still doesn't pick it up. What am I doing wrong? > > Thanks, > > Greg > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > https://mail.scipy.org/mailman/listinfo/numpy-discussion >

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