[Numpy-discussion] Building Numpy with OpenBLAS

[Michael Sarahan]

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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