[Numpy-discussion] Building Numpy with OpenBLAS

[G Young]

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.

Greg

On Wed, Jan 27, 2016 at 1:58 PM, Michael Sarahan <msarahan at gmail.com> wrote:

> 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 <gfyoung17 at gmail.com> wrote:
>
>> 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 <msarahan at gmail.com>
>> wrote:
>>
>>> 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 <gfyoung17 at gmail.com> 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
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>>>
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